runtime: timeout in TestCrashDumpsAllThreads

[gopherbot]

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

Issue created automatically to collect these failures.

Example (log):

=== RUN   TestChanSendBarrier
=== PAUSE TestChanSendBarrier

— watchflakes

[gopherbot]

Found new dashboard test flakes for:

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

2025-07-11 21:27 gotip-linux-ppc64_power10 go@1e48ca70 runtime.TestChanSendBarrier [SKIP] (log)

=== RUN   TestChanSendBarrier
=== PAUSE TestChanSendBarrier

— watchflakes

[mknyszek]

=== RUN   TestCrashDumpsAllThreads
    exec.go:213: test timed out while running command: /home/swarming/.swarming/w/ir/x/t/go-build2899754596/testprog.exe CrashDumpsAllThreads
panic: test timed out after 18m0s
	running tests:
		TestCrashDumpsAllThreads (17m49s)

goroutine 3560 gp=0xc000145340 m=7 mp=0xc0001fa808 [running]:
panic({0x4caa40?, 0xc001960040?})
	/home/swarming/.swarming/w/ir/x/w/goroot/src/runtime/panic.go:802 +0x188 fp=0xc0002d4ee0 sp=0xc0002d4e20 pc=0xa64e8
testing.(*M).startAlarm.func1()
	/home/swarming/.swarming/w/ir/x/w/goroot/src/testing/testing.go:2682 +0x300 fp=0xc0002d4fc0 sp=0xc0002d4ee0 pc=0x161400
runtime.goexit({})
	/home/swarming/.swarming/w/ir/x/w/goroot/src/runtime/asm_ppc64x.s:1015 +0x4 fp=0xc0002d4fc0 sp=0xc0002d4fc0 pc=0xaedd4
created by time.goFunc
	/home/swarming/.swarming/w/ir/x/w/goroot/src/time/sleep.go:215 +0x60

[mknyszek]

CC @golang/ppc64

[jkrishmys]

Hi @mknyszek , any extra information which I can use to understand further. Is it happening at the builders?

[gopherbot]

Found new dashboard test flakes for:

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

2025-09-29 14:53 gotip-linux-ppc64_power10 go@d42d56b7 runtime.TestChanSendBarrier [SKIP] (log)

=== RUN   TestChanSendBarrier
=== PAUSE TestChanSendBarrier

— watchflakes

[gopherbot]

Found new dashboard test flakes for:

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

2025-10-07 18:02 go1.25-linux-ppc64_power10 release-branch.go1.25@e0f655bf runtime.TestChanSendBarrier [SKIP] (log)

=== RUN   TestChanSendBarrier
=== PAUSE TestChanSendBarrier

— watchflakes