cmd/cgo/internal/testplugin: TestIssue67976 failures

[gopherbot]

#!watchflakes
default <- pkg == "cmd/cgo/internal/testplugin" && test == "TestIssue67976"

Issue created automatically to collect these failures.

Example (log):

=== RUN   TestIssue67976
( GOPATH=$TMPDIR PWD=$TMPDIR/src/testplugin LD_LIBRARY_PATH=$TMPDIR/src/testplugin /home/swarming/.swarming/w/ir/x/w/goroot/bin/go build -gcflags '' -buildmode=plugin -o issue67976.so ./issue67976/plugin.go )
SIGQUIT: quit
PC=0x8addc m=0 sigcode=0

goroutine 0 gp=0x2e6500 m=0 mp=0x2e74c0 [idle]:
runtime.futex()
	/home/swarming/.swarming/w/ir/x/w/goroot/src/runtime/sys_linux_riscv64.s:440 +0x4 fp=0x7ffffc06e948 sp=0x7ffffc06e948 pc=0x8addc
runtime.futexsleep(0x2e7c00?, 0x67b00?, 0x5f601?)
	/home/swarming/.swarming/w/ir/x/w/goroot/src/runtime/os_linux.go:73 +0x1c fp=0x7ffffc06e988 sp=0x7ffffc06e948 pc=0x56d44
...
a5  0x0	a6  0x0
a7  0x62	s2  0x7ffffc06e998
s3  0x2e74c0	s4  0x112987784000
s5  0x73	s6  0x75
s7  0x4	s8  0x0
s9  0x11298779c210	s10 0x18b7d8
s11 0x2e6500	t3  0x606b8db7819ae
t4  0xffffffffffffffff	t5  0x1b172608d66
t6  0x2e792c	pc  0x8addc
*** Test killed with quit: ran too long (19m48s).

— watchflakes

[gopherbot]

Found new dashboard test flakes for:

#!watchflakes
default <- pkg == "cmd/cgo/internal/testplugin" && test == "TestIssue67976"

2025-11-26 20:36 gotip-linux-riscv64 go@ac336924 cmd/cgo/internal/testplugin.TestIssue67976 [SKIP] (log)

=== RUN   TestIssue67976
( GOPATH=$TMPDIR PWD=$TMPDIR/src/testplugin LD_LIBRARY_PATH=$TMPDIR/src/testplugin /home/swarming/.swarming/w/ir/x/w/goroot/bin/go build -gcflags '' -buildmode=plugin -o issue67976.so ./issue67976/plugin.go )
SIGQUIT: quit
PC=0x8addc m=0 sigcode=0

goroutine 0 gp=0x2e6500 m=0 mp=0x2e74c0 [idle]:
runtime.futex()
	/home/swarming/.swarming/w/ir/x/w/goroot/src/runtime/sys_linux_riscv64.s:440 +0x4 fp=0x7ffffc06e948 sp=0x7ffffc06e948 pc=0x8addc
runtime.futexsleep(0x2e7c00?, 0x67b00?, 0x5f601?)
	/home/swarming/.swarming/w/ir/x/w/goroot/src/runtime/os_linux.go:73 +0x1c fp=0x7ffffc06e988 sp=0x7ffffc06e948 pc=0x56d44
...
a5  0x0	a6  0x0
a7  0x62	s2  0x7ffffc06e998
s3  0x2e74c0	s4  0x112987784000
s5  0x73	s6  0x75
s7  0x4	s8  0x0
s9  0x11298779c210	s10 0x18b7d8
s11 0x2e6500	t3  0x606b8db7819ae
t4  0xffffffffffffffff	t5  0x1b172608d66
t6  0x2e792c	pc  0x8addc
*** Test killed with quit: ran too long (19m48s).

— watchflakes

[mengzhuo]

Some updates: I ran the test on same builder (ebc7700-1), it completed in 167s.

( PWD=$TMPDIR/src/testplugin GOPATH=$TMPDIR LD_LIBRARY_PATH=$TMPDIR/src/testplugin /root/godev/bin/go bui
ld -gcflags '' '-gcflags=all=-N -l' -buildmode=plugin -o issue75102.so ./issue75102/plugin.go )
( PWD=$TMPDIR/src/testplugin GOPATH=$TMPDIR LD_LIBRARY_PATH=$TMPDIR/src/testplugin /root/godev/bin/go bui
ld -gcflags '' -o issue75102.exe ./issue75102/main.go )
( PWD=$TMPDIR/src/testplugin GOPATH=$TMPDIR LD_LIBRARY_PATH=$TMPDIR/src/testplugin ./issue75102.exe )
--- PASS: TestIssue75102 (3.05s)
=== CONT  TestForkExec
( PWD=$TMPDIR/src/testplugin GOPATH=$TMPDIR LD_LIBRARY_PATH=$TMPDIR/src/testplugin /root/godev/bin/go bui
ld -gcflags '' -o forkexec.exe ./forkexec/main.go )
--- PASS: TestForkExec (3.89s)
PASS
ok      cmd/cgo/internal/testplugin     167.390s

Maybe it's the thermal throttling?