runtime: TestStopTheWorldDeadlock failures [consistent failure]

[gopherbot]

#!watchflakes
default <- pkg == "runtime" && test == "TestStopTheWorldDeadlock"

Issue created automatically to collect these failures.

Example (log):

=== RUN   TestStopTheWorldDeadlock
--- FAIL: TestStopTheWorldDeadlock (1.07s)
panic: send on closed channel [recovered, repanicked]

goroutine 227884 gp=0x14000703180 m=6 mp=0x14000080808 [running]:
panic({0x102806880?, 0x1028960f0?})
	/Users/swarming/.swarming/w/ir/x/w/goroot/src/runtime/panic.go:877 +0x15c fp=0x14000177b70 sp=0x14000177ac0 pc=0x1023876dc
testing.tRunner.func1.2({0x102806880, 0x1028960f0})
	/Users/swarming/.swarming/w/ir/x/w/goroot/src/testing/testing.go:1872 +0x194 fp=0x14000177c20 sp=0x14000177b70 pc=0x10241bc44
testing.tRunner.func1()
...
runtime_test.TestSetNonblock(0x140002eb880)
	/Users/swarming/.swarming/w/ir/x/w/goroot/src/runtime/nbpipe_pipe_test.go:16 +0x28 fp=0x1400009cf60 sp=0x1400009cef0 pc=0x1026790b8
testing.tRunner(0x140002eb880, 0x102893248)
	/Users/swarming/.swarming/w/ir/x/w/goroot/src/testing/testing.go:1934 +0xc4 fp=0x1400009cfb0 sp=0x1400009cf60 pc=0x10241b374
testing.(*T).Run.gowrap1()
	/Users/swarming/.swarming/w/ir/x/w/goroot/src/testing/testing.go:1997 +0x20 fp=0x1400009cfd0 sp=0x1400009cfb0 pc=0x10241c1e0
runtime.goexit({})
	/Users/swarming/.swarming/w/ir/x/w/goroot/src/runtime/asm_arm64.s:1268 +0x4 fp=0x1400009cfd0 sp=0x1400009cfd0 pc=0x10238f794
created by testing.(*T).Run in goroutine 1
	/Users/swarming/.swarming/w/ir/x/w/goroot/src/testing/testing.go:1997 +0x364

— watchflakes

[gopherbot]

Found new dashboard test flakes for:

#!watchflakes
default <- pkg == "runtime" && test == "TestStopTheWorldDeadlock"

2025-08-15 18:31 gotip-darwin-arm64-longtest go@13df972f runtime.TestStopTheWorldDeadlock (log)

=== RUN   TestStopTheWorldDeadlock
--- FAIL: TestStopTheWorldDeadlock (1.07s)
panic: send on closed channel [recovered, repanicked]

goroutine 227884 gp=0x14000703180 m=6 mp=0x14000080808 [running]:
panic({0x102806880?, 0x1028960f0?})
	/Users/swarming/.swarming/w/ir/x/w/goroot/src/runtime/panic.go:877 +0x15c fp=0x14000177b70 sp=0x14000177ac0 pc=0x1023876dc
testing.tRunner.func1.2({0x102806880, 0x1028960f0})
	/Users/swarming/.swarming/w/ir/x/w/goroot/src/testing/testing.go:1872 +0x194 fp=0x14000177c20 sp=0x14000177b70 pc=0x10241bc44
testing.tRunner.func1()
...
runtime_test.TestSetNonblock(0x140002eb880)
	/Users/swarming/.swarming/w/ir/x/w/goroot/src/runtime/nbpipe_pipe_test.go:16 +0x28 fp=0x1400009cf60 sp=0x1400009cef0 pc=0x1026790b8
testing.tRunner(0x140002eb880, 0x102893248)
	/Users/swarming/.swarming/w/ir/x/w/goroot/src/testing/testing.go:1934 +0xc4 fp=0x1400009cfb0 sp=0x1400009cf60 pc=0x10241b374
testing.(*T).Run.gowrap1()
	/Users/swarming/.swarming/w/ir/x/w/goroot/src/testing/testing.go:1997 +0x20 fp=0x1400009cfd0 sp=0x1400009cfb0 pc=0x10241c1e0
runtime.goexit({})
	/Users/swarming/.swarming/w/ir/x/w/goroot/src/runtime/asm_arm64.s:1268 +0x4 fp=0x1400009cfd0 sp=0x1400009cfd0 pc=0x10238f794
created by testing.(*T).Run in goroutine 1
	/Users/swarming/.swarming/w/ir/x/w/goroot/src/testing/testing.go:1997 +0x364

2025-08-15 18:31 gotip-linux-386-longtest go@13df972f runtime.TestStopTheWorldDeadlock (log)

=== RUN   TestStopTheWorldDeadlock
--- FAIL: TestStopTheWorldDeadlock (1.30s)
panic: send on closed channel [recovered, repanicked]

goroutine 228066 gp=0x9ad1568 m=18 mp=0xae80808 [running]:
panic({0x8527520, 0x8638478})
	/home/swarming/.swarming/w/ir/x/w/goroot/src/runtime/panic.go:877 +0x14c fp=0x9658d4c sp=0x9658cf8 pc=0x80db03c
testing.tRunner.func1.2({0x8527520, 0x8638478})
	/home/swarming/.swarming/w/ir/x/w/goroot/src/testing/testing.go:1872 +0x29b fp=0x9658dc0 sp=0x9658d4c pc=0x8185dcb
testing.tRunner.func1()
...
runtime_test.TestCgoCallbackGC(0x9b997a8)
	/home/swarming/.swarming/w/ir/x/w/goroot/src/runtime/crash_cgo_test.go:62 +0x25 fp=0x994df84 sp=0x994df40 pc=0x83a2965
testing.tRunner(0x9b997a8, 0x85adacc)
	/home/swarming/.swarming/w/ir/x/w/goroot/src/testing/testing.go:1934 +0x114 fp=0x994dfe4 sp=0x994df84 pc=0x8185344
testing.(*T).Run.gowrap1()
	/home/swarming/.swarming/w/ir/x/w/goroot/src/testing/testing.go:1997 +0x27 fp=0x994dff0 sp=0x994dfe4 pc=0x8186507
runtime.goexit({})
	/home/swarming/.swarming/w/ir/x/w/goroot/src/runtime/asm_386.s:1386 +0x1 fp=0x994dff4 sp=0x994dff0 pc=0x80e1df1
created by testing.(*T).Run in goroutine 1
	/home/swarming/.swarming/w/ir/x/w/goroot/src/testing/testing.go:1997 +0x4b4

2025-08-15 18:31 gotip-linux-amd64-longtest go@13df972f runtime.TestStopTheWorldDeadlock (log)

=== RUN   TestStopTheWorldDeadlock
--- FAIL: TestStopTheWorldDeadlock (1.40s)
panic: send on closed channel [recovered, repanicked]

goroutine 227997 gp=0xc000563dc0 m=4 mp=0xc00007f808 [running]:
panic({0x8dd0a0?, 0xa2f440?})
	/home/swarming/.swarming/w/ir/x/w/goroot/src/runtime/panic.go:877 +0x16f fp=0xc00018db88 sp=0xc00018dad8 pc=0x48cb6f
testing.tRunner.func1.2({0x8dd0a0, 0xa2f440})
	/home/swarming/.swarming/w/ir/x/w/goroot/src/testing/testing.go:1872 +0x236 fp=0xc00018dc38 sp=0xc00018db88 pc=0x5383d6
testing.tRunner.func1()
...
runtime_test.TestCgoCCodeSIGPROF(0xc000683340)
	/home/swarming/.swarming/w/ir/x/w/goroot/src/runtime/crash_cgo_test.go:267 +0x1f fp=0xc000244f70 sp=0xc000244ef0 pc=0x7671df
testing.tRunner(0xc000683340, 0x9a0b70)
	/home/swarming/.swarming/w/ir/x/w/goroot/src/testing/testing.go:1934 +0xea fp=0xc000244fc0 sp=0xc000244f70 pc=0x5379aa
testing.(*T).Run.gowrap1()
	/home/swarming/.swarming/w/ir/x/w/goroot/src/testing/testing.go:1997 +0x1b fp=0xc000244fe0 sp=0xc000244fc0 pc=0x538adb
runtime.goexit({})
	/home/swarming/.swarming/w/ir/x/w/goroot/src/runtime/asm_amd64.s:1693 +0x1 fp=0xc000244fe8 sp=0xc000244fe0 pc=0x494ac1
created by testing.(*T).Run in goroutine 1
	/home/swarming/.swarming/w/ir/x/w/goroot/src/testing/testing.go:1997 +0x465

2025-08-15 18:31 gotip-linux-arm64-longtest go@13df972f runtime.TestStopTheWorldDeadlock (log)

=== RUN   TestStopTheWorldDeadlock
--- FAIL: TestStopTheWorldDeadlock (5.30s)
panic: send on closed channel [recovered, repanicked]

goroutine 224493 gp=0x40005536c0 m=16 mp=0x4000109808 [running]:
panic({0x46b9e0?, 0x5bcc40?})
	/home/swarming/.swarming/w/ir/x/w/goroot/src/runtime/panic.go:877 +0x15c fp=0x40000efb70 sp=0x40000efac0 pc=0x98c7c
testing.tRunner.func1.2({0x46b9e0, 0x5bcc40})
	/home/swarming/.swarming/w/ir/x/w/goroot/src/testing/testing.go:1872 +0x194 fp=0x40000efc20 sp=0x40000efb70 pc=0x137674
testing.tRunner.func1()
...
runtime_test.TestCgoCallbackPprof(0x400032c700)
	/home/swarming/.swarming/w/ir/x/w/goroot/src/runtime/crash_cgo_test.go:88 +0x20 fp=0x4000072f60 sp=0x4000072ee0 pc=0x314720
testing.tRunner(0x400032c700, 0x52ebc0)
	/home/swarming/.swarming/w/ir/x/w/goroot/src/testing/testing.go:1934 +0xc4 fp=0x4000072fb0 sp=0x4000072f60 pc=0x136da4
testing.(*T).Run.gowrap1()
	/home/swarming/.swarming/w/ir/x/w/goroot/src/testing/testing.go:1997 +0x20 fp=0x4000072fd0 sp=0x4000072fb0 pc=0x137c10
runtime.goexit({})
	/home/swarming/.swarming/w/ir/x/w/goroot/src/runtime/asm_arm64.s:1268 +0x4 fp=0x4000072fd0 sp=0x4000072fd0 pc=0xa0ac4
created by testing.(*T).Run in goroutine 1
	/home/swarming/.swarming/w/ir/x/w/goroot/src/testing/testing.go:1997 +0x364

2025-08-15 18:31 gotip-windows-amd64-longtest go@13df972f runtime.TestStopTheWorldDeadlock (log)

=== RUN   TestStopTheWorldDeadlock
--- FAIL: TestStopTheWorldDeadlock (1.49s)
panic: send on closed channel [recovered, repanicked]

goroutine 227979 gp=0xc000b68700 m=15 mp=0xc000501808 [running]:
panic({0x7ff671c433c0?, 0x7ff671d98700?})
	C:/b/s/w/ir/x/w/goroot/src/runtime/panic.go:877 +0x16f fp=0xc000035bb0 sp=0xc000035b00 pc=0x7ff6717e84cf
testing.tRunner.func1.2({0x7ff671c433c0, 0x7ff671d98700})
	C:/b/s/w/ir/x/w/goroot/src/testing/testing.go:1872 +0x239 fp=0xc000035c60 sp=0xc000035bb0 pc=0x7ff67189dc79
testing.tRunner.func1()
...
runtime_test.TestCgoExternalThreadSIGPROF(0xc0019fefc0)
	C:/b/s/w/ir/x/w/goroot/src/runtime/crash_cgo_test.go:122 +0x27 fp=0xc0002fbf70 sp=0xc0002fbed0 pc=0x7ff671acac47
testing.tRunner(0xc0019fefc0, 0x7ff671d08d08)
	C:/b/s/w/ir/x/w/goroot/src/testing/testing.go:1934 +0xc3 fp=0xc0002fbfc0 sp=0xc0002fbf70 pc=0x7ff67189d283
testing.(*T).Run.gowrap1()
	C:/b/s/w/ir/x/w/goroot/src/testing/testing.go:1997 +0x1b fp=0xc0002fbfe0 sp=0xc0002fbfc0 pc=0x7ff67189e35b
runtime.goexit({})
	C:/b/s/w/ir/x/w/goroot/src/runtime/asm_amd64.s:1693 +0x1 fp=0xc0002fbfe8 sp=0xc0002fbfe0 pc=0x7ff6717f0321
created by testing.(*T).Run in goroutine 1
	C:/b/s/w/ir/x/w/goroot/src/testing/testing.go:1997 +0x44b

2025-08-15 18:31 gotip-darwin-arm64-longtest go@ab8121a4 runtime.TestStopTheWorldDeadlock (log)

=== RUN   TestStopTheWorldDeadlock
--- FAIL: TestStopTheWorldDeadlock (0.37s)
panic: send on closed channel [recovered, repanicked]

goroutine 227824 gp=0x140001fd180 m=0 mp=0x104c684e0 [running]:
panic({0x1048f6920?, 0x104986330?})
	/Users/swarming/.swarming/w/ir/x/w/goroot/src/runtime/panic.go:877 +0x15c fp=0x140000cdb70 sp=0x140000cdac0 pc=0x1044777ec
testing.tRunner.func1.2({0x1048f6920, 0x104986330})
	/Users/swarming/.swarming/w/ir/x/w/goroot/src/testing/testing.go:1872 +0x194 fp=0x140000cdc20 sp=0x140000cdb70 pc=0x10450bd54
testing.tRunner.func1()
...
runtime_test.TestPanicTraceback(0x1400049f6c0)
	/Users/swarming/.swarming/w/ir/x/w/goroot/src/runtime/crash_test.go:573 +0x28 fp=0x140003d3f60 sp=0x140003d3e20 pc=0x1046f0558
testing.tRunner(0x1400049f6c0, 0x1049831e8)
	/Users/swarming/.swarming/w/ir/x/w/goroot/src/testing/testing.go:1934 +0xc4 fp=0x140003d3fb0 sp=0x140003d3f60 pc=0x10450b484
testing.(*T).Run.gowrap1()
	/Users/swarming/.swarming/w/ir/x/w/goroot/src/testing/testing.go:1997 +0x20 fp=0x140003d3fd0 sp=0x140003d3fb0 pc=0x10450c2f0
runtime.goexit({})
	/Users/swarming/.swarming/w/ir/x/w/goroot/src/runtime/asm_arm64.s:1268 +0x4 fp=0x140003d3fd0 sp=0x140003d3fd0 pc=0x10447f8a4
created by testing.(*T).Run in goroutine 1
	/Users/swarming/.swarming/w/ir/x/w/goroot/src/testing/testing.go:1997 +0x364

2025-08-15 18:31 gotip-linux-386-longtest go@ab8121a4 runtime.TestStopTheWorldDeadlock (log)

=== RUN   TestStopTheWorldDeadlock
--- FAIL: TestStopTheWorldDeadlock (1.30s)
panic: send on closed channel [recovered, repanicked]

goroutine 228021 gp=0x9a7a5a8 m=17 mp=0x9581808 [running]:
panic({0x8527580, 0x86386f8})
	/home/swarming/.swarming/w/ir/x/w/goroot/src/runtime/panic.go:877 +0x14c fp=0x9467d4c sp=0x9467cf8 pc=0x80db17c
testing.tRunner.func1.2({0x8527580, 0x86386f8})
	/home/swarming/.swarming/w/ir/x/w/goroot/src/testing/testing.go:1872 +0x29b fp=0x9467dc0 sp=0x9467d4c pc=0x8185f0b
testing.tRunner.func1()
...
runtime_test.TestNetpollDeadlock(0x9628ea8)
	/home/swarming/.swarming/w/ir/x/w/goroot/src/runtime/crash_test.go:564 +0x25 fp=0x9697784 sp=0x9697740 pc=0x83ac115
testing.tRunner(0x9628ea8, 0x85ae088)
	/home/swarming/.swarming/w/ir/x/w/goroot/src/testing/testing.go:1934 +0x114 fp=0x96977e4 sp=0x9697784 pc=0x8185484
testing.(*T).Run.gowrap1()
	/home/swarming/.swarming/w/ir/x/w/goroot/src/testing/testing.go:1997 +0x27 fp=0x96977f0 sp=0x96977e4 pc=0x8186647
runtime.goexit({})
	/home/swarming/.swarming/w/ir/x/w/goroot/src/runtime/asm_386.s:1386 +0x1 fp=0x96977f4 sp=0x96977f0 pc=0x80e1f31
created by testing.(*T).Run in goroutine 1
	/home/swarming/.swarming/w/ir/x/w/goroot/src/testing/testing.go:1997 +0x4b4

2025-08-15 18:31 gotip-linux-amd64-longtest go@ab8121a4 runtime.TestStopTheWorldDeadlock (log)

=== RUN   TestStopTheWorldDeadlock
--- FAIL: TestStopTheWorldDeadlock (2.25s)
panic: send on closed channel [recovered, repanicked]

goroutine 227920 gp=0xc000be5180 m=21 mp=0xc003449008 [running]:
panic({0x8dd140?, 0xa2f780?})
	/home/swarming/.swarming/w/ir/x/w/goroot/src/runtime/panic.go:877 +0x16f fp=0xc000107b88 sp=0xc000107ad8 pc=0x48cc2f
testing.tRunner.func1.2({0x8dd140, 0xa2f780})
	/home/swarming/.swarming/w/ir/x/w/goroot/src/testing/testing.go:1872 +0x236 fp=0xc000107c38 sp=0xc000107b88 pc=0x538496
testing.tRunner.func1()
...
runtime_test.TestCgoCheckBytes(0xc000bada40)
	/home/swarming/.swarming/w/ir/x/w/goroot/src/runtime/crash_cgo_test.go:211 +0x27 fp=0xc002abbf70 sp=0xc002abbe80 pc=0x766c67
testing.tRunner(0xc000bada40, 0x9a0e28)
	/home/swarming/.swarming/w/ir/x/w/goroot/src/testing/testing.go:1934 +0xea fp=0xc002abbfc0 sp=0xc002abbf70 pc=0x537a6a
testing.(*T).Run.gowrap1()
	/home/swarming/.swarming/w/ir/x/w/goroot/src/testing/testing.go:1997 +0x1b fp=0xc002abbfe0 sp=0xc002abbfc0 pc=0x538b9b
runtime.goexit({})
	/home/swarming/.swarming/w/ir/x/w/goroot/src/runtime/asm_amd64.s:1693 +0x1 fp=0xc002abbfe8 sp=0xc002abbfe0 pc=0x494b81
created by testing.(*T).Run in goroutine 1
	/home/swarming/.swarming/w/ir/x/w/goroot/src/testing/testing.go:1997 +0x465

2025-08-15 18:31 gotip-linux-arm64-longtest go@ab8121a4 runtime.TestStopTheWorldDeadlock (log)

=== RUN   TestStopTheWorldDeadlock
--- FAIL: TestStopTheWorldDeadlock (5.34s)
panic: send on closed channel [recovered, repanicked]

goroutine 228009 gp=0x40003c2000 m=12 mp=0x4000099808 [running]:
panic({0x46ba80?, 0x5bcf60?})
	/home/swarming/.swarming/w/ir/x/w/goroot/src/runtime/panic.go:877 +0x15c fp=0x40000efb70 sp=0x40000efac0 pc=0x98d8c
testing.tRunner.func1.2({0x46ba80, 0x5bcf60})
	/home/swarming/.swarming/w/ir/x/w/goroot/src/testing/testing.go:1872 +0x194 fp=0x40000efc20 sp=0x40000efb70 pc=0x137784
testing.tRunner.func1()
...
runtime_test.TestCgoTracebackContextPreemption(0x40007c5c00)
	/home/swarming/.swarming/w/ir/x/w/goroot/src/runtime/crash_cgo_test.go:357 +0x20 fp=0x400006ff60 sp=0x400006fee0 pc=0x315a00
testing.tRunner(0x40007c5c00, 0x52ef38)
	/home/swarming/.swarming/w/ir/x/w/goroot/src/testing/testing.go:1934 +0xc4 fp=0x400006ffb0 sp=0x400006ff60 pc=0x136eb4
testing.(*T).Run.gowrap1()
	/home/swarming/.swarming/w/ir/x/w/goroot/src/testing/testing.go:1997 +0x20 fp=0x400006ffd0 sp=0x400006ffb0 pc=0x137d20
runtime.goexit({})
	/home/swarming/.swarming/w/ir/x/w/goroot/src/runtime/asm_arm64.s:1268 +0x4 fp=0x400006ffd0 sp=0x400006ffd0 pc=0xa0bd4
created by testing.(*T).Run in goroutine 1
	/home/swarming/.swarming/w/ir/x/w/goroot/src/testing/testing.go:1997 +0x364

2025-08-15 18:31 gotip-windows-amd64-longtest go@ab8121a4 runtime.TestStopTheWorldDeadlock (log)

=== RUN   TestStopTheWorldDeadlock
--- FAIL: TestStopTheWorldDeadlock (1.61s)
panic: send on closed channel [recovered, repanicked]

goroutine 228028 gp=0xc0009661c0 m=7 mp=0xc00008f808 [running]:
panic({0x7ff7c2754440?, 0x7ff7c28a9a00?})
	C:/b/s/w/ir/x/w/goroot/src/runtime/panic.go:877 +0x16f fp=0xc000035bb0 sp=0xc000035b00 pc=0x7ff7c22f858f
testing.tRunner.func1.2({0x7ff7c2754440, 0x7ff7c28a9a00})
	C:/b/s/w/ir/x/w/goroot/src/testing/testing.go:1872 +0x239 fp=0xc000035c60 sp=0xc000035bb0 pc=0x7ff7c23add39
testing.tRunner.func1()
...
runtime.goparkunlock(...)
	C:/b/s/w/ir/x/w/goroot/src/runtime/proc.go:466
runtime.(*cleanupQueue).dequeue(0x7ff7c2bbb680)
	C:/b/s/w/ir/x/w/goroot/src/runtime/mcleanup.go:439 +0xe5 fp=0xc000395fa0 sp=0xc000395f68 pc=0x7ff7c22923a5
runtime.runCleanups()
	C:/b/s/w/ir/x/w/goroot/src/runtime/mcleanup.go:635 +0x45 fp=0xc000395fe0 sp=0xc000395fa0 pc=0x7ff7c2292a45
runtime.goexit({})
	C:/b/s/w/ir/x/w/goroot/src/runtime/asm_amd64.s:1693 +0x1 fp=0xc000395fe8 sp=0xc000395fe0 pc=0x7ff7c23003e1
created by runtime.(*cleanupQueue).createGs in goroutine 226246
	C:/b/s/w/ir/x/w/goroot/src/runtime/mcleanup.go:589 +0xa5

2025-08-15 19:59 gotip-darwin-arm64-longtest go@78a3968c runtime.TestStopTheWorldDeadlock (log)

=== RUN   TestStopTheWorldDeadlock
--- FAIL: TestStopTheWorldDeadlock (0.31s)
panic: send on closed channel [recovered, repanicked]

goroutine 227837 gp=0x140002a4000 m=3 mp=0x14000057008 [running]:
panic({0x101426920?, 0x1014b6360?})
	/Users/swarming/.swarming/w/ir/x/w/goroot/src/runtime/panic.go:877 +0x15c fp=0x140000fdb70 sp=0x140000fdac0 pc=0x100fa78cc
testing.tRunner.func1.2({0x101426920, 0x1014b6360})
	/Users/swarming/.swarming/w/ir/x/w/goroot/src/testing/testing.go:1872 +0x194 fp=0x140000fdc20 sp=0x140000fdb70 pc=0x10103be34
testing.tRunner.func1()
...
runtime_test.TestSetNonblock(0x14000325880)
	/Users/swarming/.swarming/w/ir/x/w/goroot/src/runtime/nbpipe_pipe_test.go:16 +0x28 fp=0x14000206f60 sp=0x14000206ef0 pc=0x1012994d8
testing.tRunner(0x14000325880, 0x1014b34a8)
	/Users/swarming/.swarming/w/ir/x/w/goroot/src/testing/testing.go:1934 +0xc4 fp=0x14000206fb0 sp=0x14000206f60 pc=0x10103b564
testing.(*T).Run.gowrap1()
	/Users/swarming/.swarming/w/ir/x/w/goroot/src/testing/testing.go:1997 +0x20 fp=0x14000206fd0 sp=0x14000206fb0 pc=0x10103c3d0
runtime.goexit({})
	/Users/swarming/.swarming/w/ir/x/w/goroot/src/runtime/asm_arm64.s:1268 +0x4 fp=0x14000206fd0 sp=0x14000206fd0 pc=0x100faf984
created by testing.(*T).Run in goroutine 1
	/Users/swarming/.swarming/w/ir/x/w/goroot/src/testing/testing.go:1997 +0x364

2025-08-15 19:59 gotip-linux-386-longtest go@78a3968c runtime.TestStopTheWorldDeadlock (log)

=== RUN   TestStopTheWorldDeadlock
--- FAIL: TestStopTheWorldDeadlock (1.26s)
panic: send on closed channel [recovered, repanicked]

goroutine 228056 gp=0xa1938c8 m=5 mp=0x9c88008 [running]:
panic({0x85275a0, 0x86387c0})
	/home/swarming/.swarming/w/ir/x/w/goroot/src/runtime/panic.go:877 +0x14c fp=0x9da9d4c sp=0x9da9cf8 pc=0x80db29c
testing.tRunner.func1.2({0x85275a0, 0x86387c0})
	/home/swarming/.swarming/w/ir/x/w/goroot/src/testing/testing.go:1872 +0x29b fp=0x9da9dc0 sp=0x9da9d4c pc=0x818602b
testing.tRunner.func1()
...
runtime_test.TestChanSendBarrier(0x9e347e8)
	/home/swarming/.swarming/w/ir/x/w/goroot/src/runtime/chanbarrier_test.go:53 +0x21 fp=0x9d81f84 sp=0x9d81f7c pc=0x83a0b11
testing.tRunner(0x9e347e8, 0x85addec)
	/home/swarming/.swarming/w/ir/x/w/goroot/src/testing/testing.go:1934 +0x114 fp=0x9d81fe4 sp=0x9d81f84 pc=0x81855a4
testing.(*T).Run.gowrap1()
	/home/swarming/.swarming/w/ir/x/w/goroot/src/testing/testing.go:1997 +0x27 fp=0x9d81ff0 sp=0x9d81fe4 pc=0x8186767
runtime.goexit({})
	/home/swarming/.swarming/w/ir/x/w/goroot/src/runtime/asm_386.s:1386 +0x1 fp=0x9d81ff4 sp=0x9d81ff0 pc=0x80e2051
created by testing.(*T).Run in goroutine 1
	/home/swarming/.swarming/w/ir/x/w/goroot/src/testing/testing.go:1997 +0x4b4

2025-08-15 19:59 gotip-linux-amd64-longtest go@78a3968c runtime.TestStopTheWorldDeadlock (log)

=== RUN   TestStopTheWorldDeadlock
--- FAIL: TestStopTheWorldDeadlock (1.27s)
panic: send on closed channel [recovered, repanicked]

goroutine 228014 gp=0xc0009941c0 m=17 mp=0xc002aa0808 [running]:
panic({0x8dd140?, 0xa2f840?})
	/home/swarming/.swarming/w/ir/x/w/goroot/src/runtime/panic.go:877 +0x16f fp=0xc0001f7b88 sp=0xc0001f7ad8 pc=0x48ccef
testing.tRunner.func1.2({0x8dd140, 0xa2f840})
	/home/swarming/.swarming/w/ir/x/w/goroot/src/testing/testing.go:1872 +0x236 fp=0xc0001f7c38 sp=0xc0001f7b88 pc=0x538556
testing.tRunner.func1()
...
runtime_test.TestConcurrentReadsAfterGrowthReflect(0xc0000ec700?)
	/home/swarming/.swarming/w/ir/x/w/goroot/src/runtime/map_test.go:360 +0x18 fp=0xc000156f70 sp=0xc000156f50 pc=0x7b7ad8
testing.tRunner(0xc0000ec700, 0x9a10b8)
	/home/swarming/.swarming/w/ir/x/w/goroot/src/testing/testing.go:1934 +0xea fp=0xc000156fc0 sp=0xc000156f70 pc=0x537b2a
testing.(*T).Run.gowrap1()
	/home/swarming/.swarming/w/ir/x/w/goroot/src/testing/testing.go:1997 +0x1b fp=0xc000156fe0 sp=0xc000156fc0 pc=0x538c5b
runtime.goexit({})
	/home/swarming/.swarming/w/ir/x/w/goroot/src/runtime/asm_amd64.s:1693 +0x1 fp=0xc000156fe8 sp=0xc000156fe0 pc=0x494c41
created by testing.(*T).Run in goroutine 1
	/home/swarming/.swarming/w/ir/x/w/goroot/src/testing/testing.go:1997 +0x465

2025-08-15 19:59 gotip-linux-arm64-longtest go@78a3968c runtime.TestStopTheWorldDeadlock (log)

=== RUN   TestStopTheWorldDeadlock
--- FAIL: TestStopTheWorldDeadlock (6.15s)
panic: send on closed channel [recovered, repanicked]

goroutine 227933 gp=0x4000849a40 m=18 mp=0x4000224008 [running]:
panic({0x46ba80?, 0x5bd030?})
	/home/swarming/.swarming/w/ir/x/w/goroot/src/runtime/panic.go:877 +0x15c fp=0x400015fb70 sp=0x400015fac0 pc=0x98e6c
testing.tRunner.func1.2({0x46ba80, 0x5bd030})
	/home/swarming/.swarming/w/ir/x/w/goroot/src/testing/testing.go:1872 +0x194 fp=0x400015fc20 sp=0x400015fb70 pc=0x137864
testing.tRunner.func1()
...
runtime_test.TestSmhasherSmallKeys(0x4000544fc0)
	/home/swarming/.swarming/w/ir/x/w/goroot/src/runtime/hash_test.go:147 +0x28 fp=0x4000299f60 sp=0x4000299eb0 pc=0x332518
testing.tRunner(0x4000544fc0, 0x52fb28)
	/home/swarming/.swarming/w/ir/x/w/goroot/src/testing/testing.go:1934 +0xc4 fp=0x4000299fb0 sp=0x4000299f60 pc=0x136f94
testing.(*T).Run.gowrap1()
	/home/swarming/.swarming/w/ir/x/w/goroot/src/testing/testing.go:1997 +0x20 fp=0x4000299fd0 sp=0x4000299fb0 pc=0x137e00
runtime.goexit({})
	/home/swarming/.swarming/w/ir/x/w/goroot/src/runtime/asm_arm64.s:1268 +0x4 fp=0x4000299fd0 sp=0x4000299fd0 pc=0xa0cb4
created by testing.(*T).Run in goroutine 1
	/home/swarming/.swarming/w/ir/x/w/goroot/src/testing/testing.go:1997 +0x364

2025-08-15 19:59 gotip-windows-amd64-longtest go@78a3968c runtime.TestStopTheWorldDeadlock (log)

=== RUN   TestStopTheWorldDeadlock
--- FAIL: TestStopTheWorldDeadlock (1.96s)
panic: send on closed channel [recovered, repanicked]

goroutine 228043 gp=0xc0011ec380 m=16 mp=0xc00008f808 [running]:
panic({0x7ff6f37c4440?, 0x7ff6f3919ac0?})
	C:/b/s/w/ir/x/w/goroot/src/runtime/panic.go:877 +0x16f fp=0xc000035bb0 sp=0xc000035b00 pc=0x7ff6f336864f
testing.tRunner.func1.2({0x7ff6f37c4440, 0x7ff6f3919ac0})
	C:/b/s/w/ir/x/w/goroot/src/testing/testing.go:1872 +0x239 fp=0xc000035c60 sp=0xc000035bb0 pc=0x7ff6f341ddf9
testing.tRunner.func1()
...
runtime_test.TestCgoTraceback(0xc000684540)
	C:/b/s/w/ir/x/w/goroot/src/runtime/crash_cgo_test.go:53 +0x1f fp=0xc00151ff70 sp=0xc00151fef0 pc=0x7ff6f364a8df
testing.tRunner(0xc000684540, 0x7ff6f388a080)
	C:/b/s/w/ir/x/w/goroot/src/testing/testing.go:1934 +0xc3 fp=0xc00151ffc0 sp=0xc00151ff70 pc=0x7ff6f341d403
testing.(*T).Run.gowrap1()
	C:/b/s/w/ir/x/w/goroot/src/testing/testing.go:1997 +0x1b fp=0xc00151ffe0 sp=0xc00151ffc0 pc=0x7ff6f341e4db
runtime.goexit({})
	C:/b/s/w/ir/x/w/goroot/src/runtime/asm_amd64.s:1693 +0x1 fp=0xc00151ffe8 sp=0xc00151ffe0 pc=0x7ff6f33704a1
created by testing.(*T).Run in goroutine 1
	C:/b/s/w/ir/x/w/goroot/src/testing/testing.go:1997 +0x44b

2025-08-15 20:18 gotip-darwin-arm64-longtest go@cb814bd5 runtime.TestStopTheWorldDeadlock (log)

=== RUN   TestStopTheWorldDeadlock
--- FAIL: TestStopTheWorldDeadlock (0.51s)
panic: send on closed channel [recovered, repanicked]

goroutine 227882 gp=0x14000561880 m=7 mp=0x14000101008 [running]:
panic({0x104e66920?, 0x104ef6360?})
	/Users/swarming/.swarming/w/ir/x/w/goroot/src/runtime/panic.go:877 +0x15c fp=0x140000cfb70 sp=0x140000cfac0 pc=0x1049e78cc
testing.tRunner.func1.2({0x104e66920, 0x104ef6360})
	/Users/swarming/.swarming/w/ir/x/w/goroot/src/testing/testing.go:1872 +0x194 fp=0x140000cfc20 sp=0x140000cfb70 pc=0x104a7be34
testing.tRunner.func1()
...
runtime_test.TestCgoExternalThreadPanic(0x14000c3b180)
	/Users/swarming/.swarming/w/ir/x/w/goroot/src/runtime/crash_cgo_test.go:107 +0x20 fp=0x140000e3f60 sp=0x140000e3ee0 pc=0x104c59500
testing.tRunner(0x14000c3b180, 0x104ef29c8)
	/Users/swarming/.swarming/w/ir/x/w/goroot/src/testing/testing.go:1934 +0xc4 fp=0x140000e3fb0 sp=0x140000e3f60 pc=0x104a7b564
testing.(*T).Run.gowrap1()
	/Users/swarming/.swarming/w/ir/x/w/goroot/src/testing/testing.go:1997 +0x20 fp=0x140000e3fd0 sp=0x140000e3fb0 pc=0x104a7c3d0
runtime.goexit({})
	/Users/swarming/.swarming/w/ir/x/w/goroot/src/runtime/asm_arm64.s:1268 +0x4 fp=0x140000e3fd0 sp=0x140000e3fd0 pc=0x1049ef984
created by testing.(*T).Run in goroutine 1
	/Users/swarming/.swarming/w/ir/x/w/goroot/src/testing/testing.go:1997 +0x364

2025-08-15 20:18 gotip-linux-386-longtest go@cb814bd5 runtime.TestStopTheWorldDeadlock (log)

=== RUN   TestStopTheWorldDeadlock
--- FAIL: TestStopTheWorldDeadlock (1.67s)
panic: send on closed channel [recovered, repanicked]

goroutine 228016 gp=0x8c03e68 m=16 mp=0xa500008 [running]:
panic({0x85275a0, 0x86387c0})
	/home/swarming/.swarming/w/ir/x/w/goroot/src/runtime/panic.go:877 +0x14c fp=0x8c6bd4c sp=0x8c6bcf8 pc=0x80db29c
testing.tRunner.func1.2({0x85275a0, 0x86387c0})
	/home/swarming/.swarming/w/ir/x/w/goroot/src/testing/testing.go:1872 +0x29b fp=0x8c6bdc0 sp=0x8c6bd4c pc=0x818602b
testing.tRunner.func1()
...
runtime_test.TestCgoPprof(0x8e846c8)
	/home/swarming/.swarming/w/ir/x/w/goroot/src/runtime/crash_cgo_test.go:451 +0x67 fp=0x944ff84 sp=0x944ff5c pc=0x83a56e7
testing.tRunner(0x8e846c8, 0x85add8c)
	/home/swarming/.swarming/w/ir/x/w/goroot/src/testing/testing.go:1934 +0x114 fp=0x944ffe4 sp=0x944ff84 pc=0x81855a4
testing.(*T).Run.gowrap1()
	/home/swarming/.swarming/w/ir/x/w/goroot/src/testing/testing.go:1997 +0x27 fp=0x944fff0 sp=0x944ffe4 pc=0x8186767
runtime.goexit({})
	/home/swarming/.swarming/w/ir/x/w/goroot/src/runtime/asm_386.s:1386 +0x1 fp=0x944fff4 sp=0x944fff0 pc=0x80e2051
created by testing.(*T).Run in goroutine 1
	/home/swarming/.swarming/w/ir/x/w/goroot/src/testing/testing.go:1997 +0x4b4

2025-08-15 20:18 gotip-linux-amd64-longtest go@cb814bd5 runtime.TestStopTheWorldDeadlock (log)

=== RUN   TestStopTheWorldDeadlock
--- FAIL: TestStopTheWorldDeadlock (1.06s)
panic: send on closed channel [recovered, repanicked]

goroutine 228009 gp=0xc0001f1c00 m=20 mp=0xc002d79808 [running]:
panic({0x8dd140?, 0xa2f840?})
	/home/swarming/.swarming/w/ir/x/w/goroot/src/runtime/panic.go:877 +0x16f fp=0xc000109b88 sp=0xc000109ad8 pc=0x48ccef
testing.tRunner.func1.2({0x8dd140, 0xa2f840})
	/home/swarming/.swarming/w/ir/x/w/goroot/src/testing/testing.go:1872 +0x236 fp=0xc000109c38 sp=0xc000109b88 pc=0x538556
testing.tRunner.func1()
...
runtime_test.TestCgoCCodeSIGPROF(0xc00042b340)
	/home/swarming/.swarming/w/ir/x/w/goroot/src/runtime/crash_cgo_test.go:267 +0x1f fp=0xc000433f70 sp=0xc000433ef0 pc=0x76735f
testing.tRunner(0xc00042b340, 0x9a0e90)
	/home/swarming/.swarming/w/ir/x/w/goroot/src/testing/testing.go:1934 +0xea fp=0xc000433fc0 sp=0xc000433f70 pc=0x537b2a
testing.(*T).Run.gowrap1()
	/home/swarming/.swarming/w/ir/x/w/goroot/src/testing/testing.go:1997 +0x1b fp=0xc000433fe0 sp=0xc000433fc0 pc=0x538c5b
runtime.goexit({})
	/home/swarming/.swarming/w/ir/x/w/goroot/src/runtime/asm_amd64.s:1693 +0x1 fp=0xc000433fe8 sp=0xc000433fe0 pc=0x494c41
created by testing.(*T).Run in goroutine 1
	/home/swarming/.swarming/w/ir/x/w/goroot/src/testing/testing.go:1997 +0x465

2025-08-15 20:18 gotip-linux-arm64-longtest go@cb814bd5 runtime.TestStopTheWorldDeadlock (log)

=== RUN   TestStopTheWorldDeadlock
--- FAIL: TestStopTheWorldDeadlock (6.65s)
panic: send on closed channel [recovered, repanicked]

goroutine 227839 gp=0x4000140e00 m=3 mp=0x4000063008 [running]:
panic({0x46ba80?, 0x5bd030?})
	/home/swarming/.swarming/w/ir/x/w/goroot/src/runtime/panic.go:877 +0x15c fp=0x40001c3b70 sp=0x40001c3ac0 pc=0x98e6c
testing.tRunner.func1.2({0x46ba80, 0x5bd030})
	/home/swarming/.swarming/w/ir/x/w/goroot/src/testing/testing.go:1872 +0x194 fp=0x40001c3c20 sp=0x40001c3b70 pc=0x137864
testing.tRunner.func1()
...
runtime_test.TestNetpollDeadlock(0x4000556e00)
	/home/swarming/.swarming/w/ir/x/w/goroot/src/runtime/crash_test.go:564 +0x20 fp=0x4000539f60 sp=0x4000539ee0 pc=0x31b910
testing.tRunner(0x4000556e00, 0x52f698)
	/home/swarming/.swarming/w/ir/x/w/goroot/src/testing/testing.go:1934 +0xc4 fp=0x4000539fb0 sp=0x4000539f60 pc=0x136f94
testing.(*T).Run.gowrap1()
	/home/swarming/.swarming/w/ir/x/w/goroot/src/testing/testing.go:1997 +0x20 fp=0x4000539fd0 sp=0x4000539fb0 pc=0x137e00
runtime.goexit({})
	/home/swarming/.swarming/w/ir/x/w/goroot/src/runtime/asm_arm64.s:1268 +0x4 fp=0x4000539fd0 sp=0x4000539fd0 pc=0xa0cb4
created by testing.(*T).Run in goroutine 1
	/home/swarming/.swarming/w/ir/x/w/goroot/src/testing/testing.go:1997 +0x364

2025-08-15 20:18 gotip-windows-amd64-longtest go@cb814bd5 runtime.TestStopTheWorldDeadlock (log)

=== RUN   TestStopTheWorldDeadlock
--- FAIL: TestStopTheWorldDeadlock (1.17s)
panic: send on closed channel [recovered, repanicked]

goroutine 227993 gp=0xc0009221c0 m=7 mp=0xc000480008 [running]:
panic({0x7ff72b424440?, 0x7ff72b579ac0?})
	C:/b/s/w/ir/x/w/goroot/src/runtime/panic.go:877 +0x16f fp=0xc000035bb0 sp=0xc000035b00 pc=0x7ff72afc864f
testing.tRunner.func1.2({0x7ff72b424440, 0x7ff72b579ac0})
	C:/b/s/w/ir/x/w/goroot/src/testing/testing.go:1872 +0x239 fp=0xc000035c60 sp=0xc000035bb0 pc=0x7ff72b07ddf9
testing.tRunner.func1()
...
runtime_test.TestStackSwitchCallback(0xc0002ad500)
	C:/b/s/w/ir/x/w/goroot/src/runtime/crash_cgo_test.go:976 +0x25 fp=0xc0004ddf70 sp=0xc0004ddee0 pc=0x7ff72b2af885
testing.tRunner(0xc0002ad500, 0x7ff72b4eac00)
	C:/b/s/w/ir/x/w/goroot/src/testing/testing.go:1934 +0xc3 fp=0xc0004ddfc0 sp=0xc0004ddf70 pc=0x7ff72b07d403
testing.(*T).Run.gowrap1()
	C:/b/s/w/ir/x/w/goroot/src/testing/testing.go:1997 +0x1b fp=0xc0004ddfe0 sp=0xc0004ddfc0 pc=0x7ff72b07e4db
runtime.goexit({})
	C:/b/s/w/ir/x/w/goroot/src/runtime/asm_amd64.s:1693 +0x1 fp=0xc0004ddfe8 sp=0xc0004ddfe0 pc=0x7ff72afd04a1
created by testing.(*T).Run in goroutine 1
	C:/b/s/w/ir/x/w/goroot/src/testing/testing.go:1997 +0x44b

— watchflakes

[rhysh]

TestStopTheWorldDeadlock uses a package-level channel called stop

go/src/runtime/proc_test.go

Line 57 in 786be1d

stop <- true

CL 690397 writes to it in the "waiting" subtest of TestReadMetricsSched

CC @mknyszek

[gopherbot]

Found new dashboard test flakes for:

#!watchflakes
default <- pkg == "runtime" && test == "TestStopTheWorldDeadlock"

2025-08-15 18:31 gotip-linux-amd64-longtest-race go@13df972f runtime.TestStopTheWorldDeadlock (log)

=== RUN   TestStopTheWorldDeadlock
--- FAIL: TestStopTheWorldDeadlock (1.17s)
panic: send on closed channel [recovered, repanicked]

goroutine 227586 gp=0xc000332000 m=8 mp=0xc0000c8008 [running]:
panic({0xba2340?, 0xd20190?})
	/home/swarming/.swarming/w/ir/x/w/goroot/src/runtime/panic.go:877 +0x16f fp=0xc0001799f8 sp=0xc000179948 pc=0x4c8a8f
testing.tRunner.func1.2({0xba2340, 0xd20190})
	/home/swarming/.swarming/w/ir/x/w/goroot/src/testing/testing.go:1872 +0x419 fp=0xc000179b00 sp=0xc0001799f8 pc=0x5e28b9
testing.tRunner.func1()
...
runtime_test.TestCheckPtr(0xc0003eae00)
	/home/swarming/.swarming/w/ir/x/w/goroot/src/runtime/checkptr_test.go:21 +0x112 fp=0xc00071bee0 sp=0xc00071bca0 pc=0x991c52
testing.tRunner(0xc0003eae00, 0xc68fa0)
	/home/swarming/.swarming/w/ir/x/w/goroot/src/testing/testing.go:1934 +0x21d fp=0xc00071bfb0 sp=0xc00071bee0 pc=0x5e181d
testing.(*T).Run.gowrap1()
	/home/swarming/.swarming/w/ir/x/w/goroot/src/testing/testing.go:1997 +0x39 fp=0xc00071bfe0 sp=0xc00071bfb0 pc=0x5e36d9
runtime.goexit({})
	/home/swarming/.swarming/w/ir/x/w/goroot/src/runtime/asm_amd64.s:1693 +0x1 fp=0xc00071bfe8 sp=0xc00071bfe0 pc=0x4d0de1
created by testing.(*T).Run in goroutine 1
	/home/swarming/.swarming/w/ir/x/w/goroot/src/testing/testing.go:1997 +0x9d3

2025-08-15 18:31 gotip-linux-amd64-longtest-race go@ab8121a4 runtime.TestStopTheWorldDeadlock (log)

=== RUN   TestStopTheWorldDeadlock
--- FAIL: TestStopTheWorldDeadlock (1.04s)
panic: send on closed channel [recovered, repanicked]

goroutine 227605 gp=0xc0019a7c00 m=11 mp=0xc000181008 [running]:
panic({0xba33e0?, 0xd214f0?})
	/home/swarming/.swarming/w/ir/x/w/goroot/src/runtime/panic.go:877 +0x16f fp=0xc00010f9f8 sp=0xc00010f948 pc=0x4c8b4f
testing.tRunner.func1.2({0xba33e0, 0xd214f0})
	/home/swarming/.swarming/w/ir/x/w/goroot/src/testing/testing.go:1872 +0x419 fp=0xc00010fb00 sp=0xc00010f9f8 pc=0x5e2979
testing.tRunner.func1()
...
runtime.goparkunlock(...)
	/home/swarming/.swarming/w/ir/x/w/goroot/src/runtime/proc.go:466
runtime.(*cleanupQueue).dequeue(0x10824a0)
	/home/swarming/.swarming/w/ir/x/w/goroot/src/runtime/mcleanup.go:439 +0xe5 fp=0xc0001bbf78 sp=0xc0001bbf40 pc=0x45d1e5
runtime.runCleanups()
	/home/swarming/.swarming/w/ir/x/w/goroot/src/runtime/mcleanup.go:635 +0x45 fp=0xc0001bbfe0 sp=0xc0001bbf78 pc=0x45d885
runtime.goexit({})
	/home/swarming/.swarming/w/ir/x/w/goroot/src/runtime/asm_amd64.s:1693 +0x1 fp=0xc0001bbfe8 sp=0xc0001bbfe0 pc=0x4d0ea1
created by runtime.(*cleanupQueue).createGs in goroutine 225528
	/home/swarming/.swarming/w/ir/x/w/goroot/src/runtime/mcleanup.go:589 +0xa5

2025-08-15 19:59 gotip-linux-amd64-longtest-race go@78a3968c runtime.TestStopTheWorldDeadlock (log)

=== RUN   TestStopTheWorldDeadlock
--- FAIL: TestStopTheWorldDeadlock (1.30s)
panic: send on closed channel [recovered, repanicked]

goroutine 227552 gp=0xc000182fc0 m=17 mp=0xc000101808 [running]:
panic({0xba33e0?, 0xd21590?})
	/home/swarming/.swarming/w/ir/x/w/goroot/src/runtime/panic.go:877 +0x16f fp=0xc000ad79f8 sp=0xc000ad7948 pc=0x4c8c0f
testing.tRunner.func1.2({0xba33e0, 0xd21590})
	/home/swarming/.swarming/w/ir/x/w/goroot/src/testing/testing.go:1872 +0x419 fp=0xc000ad7b00 sp=0xc000ad79f8 pc=0x5e2a39
testing.tRunner.func1()
...
runtime_test.TestMemmoveOverflow(0xc000402540)
	/home/swarming/.swarming/w/ir/x/w/goroot/src/runtime/memmove_linux_amd64_test.go:22 +0x3f fp=0xc000ad9ee0 sp=0xc000ad9d70 pc=0xa19e9f
testing.tRunner(0xc000402540, 0xc6a850)
	/home/swarming/.swarming/w/ir/x/w/goroot/src/testing/testing.go:1934 +0x21d fp=0xc000ad9fb0 sp=0xc000ad9ee0 pc=0x5e199d
testing.(*T).Run.gowrap1()
	/home/swarming/.swarming/w/ir/x/w/goroot/src/testing/testing.go:1997 +0x39 fp=0xc000ad9fe0 sp=0xc000ad9fb0 pc=0x5e3859
runtime.goexit({})
	/home/swarming/.swarming/w/ir/x/w/goroot/src/runtime/asm_amd64.s:1693 +0x1 fp=0xc000ad9fe8 sp=0xc000ad9fe0 pc=0x4d0f61
created by testing.(*T).Run in goroutine 1
	/home/swarming/.swarming/w/ir/x/w/goroot/src/testing/testing.go:1997 +0x9d3

2025-08-15 20:18 gotip-linux-amd64-longtest-race go@cb814bd5 runtime.TestStopTheWorldDeadlock (log)

=== RUN   TestStopTheWorldDeadlock
--- FAIL: TestStopTheWorldDeadlock (1.21s)
panic: send on closed channel [recovered, repanicked]

goroutine 227611 gp=0xc0006f9a40 m=12 mp=0xc000502808 [running]:
panic({0xba33e0?, 0xd21590?})
	/home/swarming/.swarming/w/ir/x/w/goroot/src/runtime/panic.go:877 +0x16f fp=0xc00024b9f8 sp=0xc00024b948 pc=0x4c8c0f
testing.tRunner.func1.2({0xba33e0, 0xd21590})
	/home/swarming/.swarming/w/ir/x/w/goroot/src/testing/testing.go:1872 +0x419 fp=0xc00024bb00 sp=0xc00024b9f8 pc=0x5e2a39
testing.tRunner.func1()
...
runtime_test.TestCgoSigfwd(0xc00080ae00)
	/home/swarming/.swarming/w/ir/x/w/goroot/src/runtime/crash_cgo_test.go:934 +0x3c fp=0xc000451ee0 sp=0xc000451e48 pc=0x99a35c
testing.tRunner(0xc00080ae00, 0xc6a200)
	/home/swarming/.swarming/w/ir/x/w/goroot/src/testing/testing.go:1934 +0x21d fp=0xc000451fb0 sp=0xc000451ee0 pc=0x5e199d
testing.(*T).Run.gowrap1()
	/home/swarming/.swarming/w/ir/x/w/goroot/src/testing/testing.go:1997 +0x39 fp=0xc000451fe0 sp=0xc000451fb0 pc=0x5e3859
runtime.goexit({})
	/home/swarming/.swarming/w/ir/x/w/goroot/src/runtime/asm_amd64.s:1693 +0x1 fp=0xc000451fe8 sp=0xc000451fe0 pc=0x4d0f61
created by testing.(*T).Run in goroutine 1
	/home/swarming/.swarming/w/ir/x/w/goroot/src/testing/testing.go:1997 +0x9d3

2025-08-15 21:01 gotip-darwin-arm64-longtest go@4a7fde92 runtime.TestStopTheWorldDeadlock (log)

=== RUN   TestStopTheWorldDeadlock
--- FAIL: TestStopTheWorldDeadlock (0.46s)
panic: send on closed channel [recovered, repanicked]

goroutine 227882 gp=0x140003ac540 m=0 mp=0x1016f8500 [running]:
panic({0x101386760?, 0x101416160?})
	/Users/swarming/.swarming/w/ir/x/w/goroot/src/runtime/panic.go:877 +0x15c fp=0x140000fdb70 sp=0x140000fdac0 pc=0x100f0795c
testing.tRunner.func1.2({0x101386760, 0x101416160})
	/Users/swarming/.swarming/w/ir/x/w/goroot/src/testing/testing.go:1872 +0x194 fp=0x140000fdc20 sp=0x140000fdb70 pc=0x100f9bef4
testing.tRunner.func1()
...
runtime_test.TestEnsureDropM(0x14000703dc0)
	/Users/swarming/.swarming/w/ir/x/w/goroot/src/runtime/crash_cgo_test.go:191 +0x20 fp=0x14000284f60 sp=0x14000284ee0 pc=0x10117a420
testing.tRunner(0x14000703dc0, 0x101412a60)
	/Users/swarming/.swarming/w/ir/x/w/goroot/src/testing/testing.go:1934 +0xc4 fp=0x14000284fb0 sp=0x14000284f60 pc=0x100f9b624
testing.(*T).Run.gowrap1()
	/Users/swarming/.swarming/w/ir/x/w/goroot/src/testing/testing.go:1997 +0x20 fp=0x14000284fd0 sp=0x14000284fb0 pc=0x100f9c490
runtime.goexit({})
	/Users/swarming/.swarming/w/ir/x/w/goroot/src/runtime/asm_arm64.s:1268 +0x4 fp=0x14000284fd0 sp=0x14000284fd0 pc=0x100f0f984
created by testing.(*T).Run in goroutine 1
	/Users/swarming/.swarming/w/ir/x/w/goroot/src/testing/testing.go:1997 +0x364

2025-08-15 21:01 gotip-linux-386-longtest go@4a7fde92 runtime.TestStopTheWorldDeadlock (log)

=== RUN   TestStopTheWorldDeadlock
--- FAIL: TestStopTheWorldDeadlock (1.42s)
panic: send on closed channel [recovered, repanicked]

goroutine 228061 gp=0x8ecaa28 m=15 mp=0x8d01008 [running]:
panic({0x85283e0, 0x8639908})
	/home/swarming/.swarming/w/ir/x/w/goroot/src/runtime/panic.go:877 +0x14c fp=0x8c66d4c sp=0x8c66cf8 pc=0x80db33c
testing.tRunner.func1.2({0x85283e0, 0x8639908})
	/home/swarming/.swarming/w/ir/x/w/goroot/src/testing/testing.go:1872 +0x29b fp=0x8c66dc0 sp=0x8c66d4c pc=0x8185f3b
testing.tRunner.func1()
...
runtime_test.TestCgoCheckBytes(0x8d2c488)
	/home/swarming/.swarming/w/ir/x/w/goroot/src/runtime/crash_cgo_test.go:211 +0x2f fp=0x9391f84 sp=0x9391ee8 pc=0x83a405f
testing.tRunner(0x8d2c488, 0x85aedac)
	/home/swarming/.swarming/w/ir/x/w/goroot/src/testing/testing.go:1934 +0x114 fp=0x9391fe4 sp=0x9391f84 pc=0x81854b4
testing.(*T).Run.gowrap1()
	/home/swarming/.swarming/w/ir/x/w/goroot/src/testing/testing.go:1997 +0x27 fp=0x9391ff0 sp=0x9391fe4 pc=0x8186677
runtime.goexit({})
	/home/swarming/.swarming/w/ir/x/w/goroot/src/runtime/asm_386.s:1386 +0x1 fp=0x9391ff4 sp=0x9391ff0 pc=0x80e2051
created by testing.(*T).Run in goroutine 1
	/home/swarming/.swarming/w/ir/x/w/goroot/src/testing/testing.go:1997 +0x4b4

2025-08-15 21:01 gotip-linux-amd64-longtest go@4a7fde92 runtime.TestStopTheWorldDeadlock (log)

=== RUN   TestStopTheWorldDeadlock
--- FAIL: TestStopTheWorldDeadlock (1.38s)
panic: send on closed channel [recovered, repanicked]

goroutine 228001 gp=0xc0000021c0 m=16 mp=0xc000201808 [running]:
panic({0x8ddf80?, 0xa308f0?})
	/home/swarming/.swarming/w/ir/x/w/goroot/src/runtime/panic.go:877 +0x16f fp=0xc000175b88 sp=0xc000175ad8 pc=0x48cdaf
testing.tRunner.func1.2({0x8ddf80, 0xa308f0})
	/home/swarming/.swarming/w/ir/x/w/goroot/src/testing/testing.go:1872 +0x236 fp=0xc000175c38 sp=0xc000175b88 pc=0x5385f6
testing.tRunner.func1()
...
runtime_test.TestSmhasherText(0xc0005848c0)
	/home/swarming/.swarming/w/ir/x/w/goroot/src/runtime/hash_test.go:597 +0x7a fp=0xc0000d8f70 sp=0xc0000d8f08 pc=0x78c75a
testing.tRunner(0xc0005848c0, 0x9a2ab8)
	/home/swarming/.swarming/w/ir/x/w/goroot/src/testing/testing.go:1934 +0xea fp=0xc0000d8fc0 sp=0xc0000d8f70 pc=0x537bca
testing.(*T).Run.gowrap1()
	/home/swarming/.swarming/w/ir/x/w/goroot/src/testing/testing.go:1997 +0x1b fp=0xc0000d8fe0 sp=0xc0000d8fc0 pc=0x538cfb
runtime.goexit({})
	/home/swarming/.swarming/w/ir/x/w/goroot/src/runtime/asm_amd64.s:1693 +0x1 fp=0xc0000d8fe8 sp=0xc0000d8fe0 pc=0x494c41
created by testing.(*T).Run in goroutine 1
	/home/swarming/.swarming/w/ir/x/w/goroot/src/testing/testing.go:1997 +0x465

2025-08-15 21:01 gotip-linux-amd64-longtest-race go@4a7fde92 runtime.TestStopTheWorldDeadlock (log)

=== RUN   TestStopTheWorldDeadlock
--- FAIL: TestStopTheWorldDeadlock (1.14s)
panic: send on closed channel [recovered, repanicked]

goroutine 227602 gp=0xc0004f28c0 m=16 mp=0xc0029d8808 [running]:
panic({0xba4220?, 0xd224f0?})
	/home/swarming/.swarming/w/ir/x/w/goroot/src/runtime/panic.go:877 +0x16f fp=0xc000ee79f8 sp=0xc000ee7948 pc=0x4c8ccf
testing.tRunner.func1.2({0xba4220, 0xd224f0})
	/home/swarming/.swarming/w/ir/x/w/goroot/src/testing/testing.go:1872 +0x419 fp=0xc000ee7b00 sp=0xc000ee79f8 pc=0x5e2b19
testing.tRunner.func1()
...
runtime.goparkunlock(...)
	/home/swarming/.swarming/w/ir/x/w/goroot/src/runtime/proc.go:466
runtime.(*cleanupQueue).dequeue(0x10844c0)
	/home/swarming/.swarming/w/ir/x/w/goroot/src/runtime/mcleanup.go:439 +0xe5 fp=0xc000267f78 sp=0xc000267f40 pc=0x45d1e5
runtime.runCleanups()
	/home/swarming/.swarming/w/ir/x/w/goroot/src/runtime/mcleanup.go:635 +0x45 fp=0xc000267fe0 sp=0xc000267f78 pc=0x45d885
runtime.goexit({})
	/home/swarming/.swarming/w/ir/x/w/goroot/src/runtime/asm_amd64.s:1693 +0x1 fp=0xc000267fe8 sp=0xc000267fe0 pc=0x4d0f61
created by runtime.(*cleanupQueue).createGs in goroutine 226089
	/home/swarming/.swarming/w/ir/x/w/goroot/src/runtime/mcleanup.go:589 +0xa5

2025-08-15 21:01 gotip-linux-arm64-longtest go@4a7fde92 runtime.TestStopTheWorldDeadlock (log)

=== RUN   TestStopTheWorldDeadlock
--- FAIL: TestStopTheWorldDeadlock (6.83s)
panic: send on closed channel [recovered, repanicked]

goroutine 227990 gp=0x400073c1c0 m=3 mp=0x4000063008 [running]:
panic({0x46b8c0?, 0x5bd0c0?})
	/home/swarming/.swarming/w/ir/x/w/goroot/src/runtime/panic.go:877 +0x15c fp=0x40001d9b70 sp=0x40001d9ac0 pc=0x98efc
testing.tRunner.func1.2({0x46b8c0, 0x5bd0c0})
	/home/swarming/.swarming/w/ir/x/w/goroot/src/testing/testing.go:1872 +0x194 fp=0x40001d9c20 sp=0x40001d9b70 pc=0x137924
testing.tRunner.func1()
...
runtime_test.TestCheckPtr(0x4000b7a700)
	/home/swarming/.swarming/w/ir/x/w/goroot/src/runtime/checkptr_test.go:21 +0x7c fp=0x4000072f60 sp=0x4000072d40 pc=0x313a8c
testing.tRunner(0x4000b7a700, 0x52f000)
	/home/swarming/.swarming/w/ir/x/w/goroot/src/testing/testing.go:1934 +0xc4 fp=0x4000072fb0 sp=0x4000072f60 pc=0x137054
testing.(*T).Run.gowrap1()
	/home/swarming/.swarming/w/ir/x/w/goroot/src/testing/testing.go:1997 +0x20 fp=0x4000072fd0 sp=0x4000072fb0 pc=0x137ec0
runtime.goexit({})
	/home/swarming/.swarming/w/ir/x/w/goroot/src/runtime/asm_arm64.s:1268 +0x4 fp=0x4000072fd0 sp=0x4000072fd0 pc=0xa0cb4
created by testing.(*T).Run in goroutine 1
	/home/swarming/.swarming/w/ir/x/w/goroot/src/testing/testing.go:1997 +0x364

2025-08-15 21:01 gotip-windows-amd64-longtest go@4a7fde92 runtime.TestStopTheWorldDeadlock (log)

=== RUN   TestStopTheWorldDeadlock
--- FAIL: TestStopTheWorldDeadlock (1.20s)
panic: send on closed channel [recovered, repanicked]

goroutine 227980 gp=0xc001c22e00 m=6 mp=0xc000080808 [running]:
panic({0x7ff6bc5e42a0?, 0x7ff6bc739b80?})
	C:/b/s/w/ir/x/w/goroot/src/runtime/panic.go:877 +0x16f fp=0xc000035bb0 sp=0xc000035b00 pc=0x7ff6bc18870f
testing.tRunner.func1.2({0x7ff6bc5e42a0, 0x7ff6bc739b80})
	C:/b/s/w/ir/x/w/goroot/src/testing/testing.go:1872 +0x239 fp=0xc000035c60 sp=0xc000035bb0 pc=0x7ff6bc23de99
testing.tRunner.func1()
...
runtime_test.TestCgoTracebackContext(0xc000346e00)
	C:/b/s/w/ir/x/w/goroot/src/runtime/crash_cgo_test.go:345 +0x1f fp=0xc00027bf70 sp=0xc00027bef0 pc=0x7ff6bc46cb7f
testing.tRunner(0xc000346e00, 0x7ff6bc6aa068)
	C:/b/s/w/ir/x/w/goroot/src/testing/testing.go:1934 +0xc3 fp=0xc00027bfc0 sp=0xc00027bf70 pc=0x7ff6bc23d4a3
testing.(*T).Run.gowrap1()
	C:/b/s/w/ir/x/w/goroot/src/testing/testing.go:1997 +0x1b fp=0xc00027bfe0 sp=0xc00027bfc0 pc=0x7ff6bc23e57b
runtime.goexit({})
	C:/b/s/w/ir/x/w/goroot/src/runtime/asm_amd64.s:1693 +0x1 fp=0xc00027bfe8 sp=0xc00027bfe0 pc=0x7ff6bc1904a1
created by testing.(*T).Run in goroutine 1
	C:/b/s/w/ir/x/w/goroot/src/testing/testing.go:1997 +0x44b

— watchflakes

[mknyszek]

Fixed already. :)

[mknyszek]

CL 696556

[gopherbot]

Found new dashboard test flakes for:

#!watchflakes
default <- pkg == "runtime" && test == "TestStopTheWorldDeadlock"

2025-08-15 18:31 gotip-darwin-amd64-longtest go@ab8121a4 runtime.TestStopTheWorldDeadlock (log)

=== RUN   TestStopTheWorldDeadlock
--- FAIL: TestStopTheWorldDeadlock (7.10s)
panic: send on closed channel [recovered, repanicked]

goroutine 227889 gp=0xc000c3b340 m=11 mp=0xc000081808 [running]:
panic({0xba2fb60?, 0xbabf930?})
	/Users/swarming/.swarming/w/ir/x/w/goroot/src/runtime/panic.go:877 +0x16f fp=0xc000183b88 sp=0xc000183ad8 pc=0xb528d4f
testing.tRunner.func1.2({0xba2fb60, 0xbabf930})
	/Users/swarming/.swarming/w/ir/x/w/goroot/src/testing/testing.go:1872 +0x236 fp=0xc000183c38 sp=0xc000183b88 pc=0xb5c8f36
testing.tRunner.func1()
...
runtime_test.TestGcPacer(0xc000248fc0)
	/Users/swarming/.swarming/w/ir/x/w/goroot/src/runtime/mgcpacer_test.go:17 +0x2a fp=0xc0009ebf70 sp=0xc0009eba60 pc=0xb86826a
testing.tRunner(0xc000248fc0, 0xbabc318)
	/Users/swarming/.swarming/w/ir/x/w/goroot/src/testing/testing.go:1934 +0xea fp=0xc0009ebfc0 sp=0xc0009ebf70 pc=0xb5c850a
testing.(*T).Run.gowrap1()
	/Users/swarming/.swarming/w/ir/x/w/goroot/src/testing/testing.go:1997 +0x1b fp=0xc0009ebfe0 sp=0xc0009ebfc0 pc=0xb5c963b
runtime.goexit({})
	/Users/swarming/.swarming/w/ir/x/w/goroot/src/runtime/asm_amd64.s:1693 +0x1 fp=0xc0009ebfe8 sp=0xc0009ebfe0 pc=0xb5310a1
created by testing.(*T).Run in goroutine 1
	/Users/swarming/.swarming/w/ir/x/w/goroot/src/testing/testing.go:1997 +0x465

2025-08-15 20:18 gotip-darwin-amd64-longtest go@cb814bd5 runtime.TestStopTheWorldDeadlock (log)

=== RUN   TestStopTheWorldDeadlock
--- FAIL: TestStopTheWorldDeadlock (5.82s)
panic: send on closed channel [recovered, repanicked]

goroutine 227868 gp=0xc0001aa1c0 m=0 mp=0xed70a00 [running]:
panic({0xe9e6b60?, 0xea76950?})
	/Users/swarming/.swarming/w/ir/x/w/goroot/src/runtime/panic.go:877 +0x16f fp=0xc0001c1b88 sp=0xc0001c1ad8 pc=0xe4dfe0f
testing.tRunner.func1.2({0xe9e6b60, 0xea76950})
	/Users/swarming/.swarming/w/ir/x/w/goroot/src/testing/testing.go:1872 +0x236 fp=0xc0001c1c38 sp=0xc0001c1b88 pc=0xe57fff6
testing.tRunner.func1()
...
runtime_test.TestCgoPprof(0xc00020b6c0?)
	/Users/swarming/.swarming/w/ir/x/w/goroot/src/runtime/crash_cgo_test.go:451 +0x3d fp=0xc000398f70 sp=0xc000398f18 pc=0xe7afb1d
testing.tRunner(0xc00020b6c0, 0xea72ff0)
	/Users/swarming/.swarming/w/ir/x/w/goroot/src/testing/testing.go:1934 +0xea fp=0xc000398fc0 sp=0xc000398f70 pc=0xe57f5ca
testing.(*T).Run.gowrap1()
	/Users/swarming/.swarming/w/ir/x/w/goroot/src/testing/testing.go:1997 +0x1b fp=0xc000398fe0 sp=0xc000398fc0 pc=0xe5806fb
runtime.goexit({})
	/Users/swarming/.swarming/w/ir/x/w/goroot/src/runtime/asm_amd64.s:1693 +0x1 fp=0xc000398fe8 sp=0xc000398fe0 pc=0xe4e8161
created by testing.(*T).Run in goroutine 1
	/Users/swarming/.swarming/w/ir/x/w/goroot/src/testing/testing.go:1997 +0x465

2025-08-15 21:01 gotip-darwin-amd64-longtest go@4a7fde92 runtime.TestStopTheWorldDeadlock (log)

=== RUN   TestStopTheWorldDeadlock
--- FAIL: TestStopTheWorldDeadlock (5.83s)
panic: send on closed channel [recovered, repanicked]

goroutine 227824 gp=0xc0000dc1c0 m=13 mp=0xc00019c808 [running]:
panic({0x49339a0?, 0x49c3750?})
	/Users/swarming/.swarming/w/ir/x/w/goroot/src/runtime/panic.go:877 +0x16f fp=0xc0001a1b88 sp=0xc0001a1ad8 pc=0x442becf
testing.tRunner.func1.2({0x49339a0, 0x49c3750})
	/Users/swarming/.swarming/w/ir/x/w/goroot/src/testing/testing.go:1872 +0x236 fp=0xc0001a1c38 sp=0xc0001a1b88 pc=0x44cc096
testing.tRunner.func1()
...
runtime_test.TestGcPacer(0xc000145a40)
	/Users/swarming/.swarming/w/ir/x/w/goroot/src/runtime/mgcpacer_test.go:17 +0x2a fp=0xc000a78f70 sp=0xc000a78a60 pc=0x476be2a
testing.tRunner(0xc000145a40, 0x49c0138)
	/Users/swarming/.swarming/w/ir/x/w/goroot/src/testing/testing.go:1934 +0xea fp=0xc000a78fc0 sp=0xc000a78f70 pc=0x44cb66a
testing.(*T).Run.gowrap1()
	/Users/swarming/.swarming/w/ir/x/w/goroot/src/testing/testing.go:1997 +0x1b fp=0xc000a78fe0 sp=0xc000a78fc0 pc=0x44cc79b
runtime.goexit({})
	/Users/swarming/.swarming/w/ir/x/w/goroot/src/runtime/asm_amd64.s:1693 +0x1 fp=0xc000a78fe8 sp=0xc000a78fe0 pc=0x4434161
created by testing.(*T).Run in goroutine 1
	/Users/swarming/.swarming/w/ir/x/w/goroot/src/testing/testing.go:1997 +0x465

— watchflakes