internal/trace/v2: TestTraceStress failures

[gopherbot]

#!watchflakes
default <- pkg == "internal/trace/v2" && test == "TestTraceStress"

Issue created automatically to collect these failures.

Example (log):

--- FAIL: TestTraceStress (3.33s)
    --- FAIL: TestTraceStress/Default (3.33s)
        trace_test.go:551: stderr: SIGSEGV: segmentation violation
            PC=0x9ef0fac m=9 sigcode=1 addr=0x90

            goroutine 0 gp=0xc000007ba0 m=9 mp=0xc00007a008 [idle]:
            runtime.readgstatus(...)
            	/tmp/buildlet/go/src/runtime/proc.go:1056
            runtime.traceWriter.writeProcStatusForP({{0xc00007a008?, 0xa0000000a?}, 0x300000002?}, 0x70000fc3bd38?, 0x56?)
            	/tmp/buildlet/go/src/runtime/trace2status.go:91 +0xcc fp=0x70000fc3bcf0 sp=0x70000fc3bcb8 pc=0x9ef0fac
...
            r13    0x1
            r14    0xc000007ba0
            r15    0x3
            rip    0x9ef0fac
            rflags 0x10246
            cs     0x2b
            fs     0x0
            gs     0x0
            exit status 2
        trace_test.go:553: exit status 1

— watchflakes

[gopherbot]

Found new dashboard test flakes for:

#!watchflakes
default <- pkg == "internal/trace/v2" && test == "TestTraceStress"

2023-12-01 19:20 darwin-amd64-nocgo go@5a2161ce internal/trace/v2.TestTraceStress (log)

--- FAIL: TestTraceStress (3.33s)
    --- FAIL: TestTraceStress/Default (3.33s)
        trace_test.go:551: stderr: SIGSEGV: segmentation violation
            PC=0x9ef0fac m=9 sigcode=1 addr=0x90

            goroutine 0 gp=0xc000007ba0 m=9 mp=0xc00007a008 [idle]:
            runtime.readgstatus(...)
            	/tmp/buildlet/go/src/runtime/proc.go:1056
            runtime.traceWriter.writeProcStatusForP({{0xc00007a008?, 0xa0000000a?}, 0x300000002?}, 0x70000fc3bd38?, 0x56?)
            	/tmp/buildlet/go/src/runtime/trace2status.go:91 +0xcc fp=0x70000fc3bcf0 sp=0x70000fc3bcb8 pc=0x9ef0fac
...
            r13    0x1
            r14    0xc000007ba0
            r15    0x3
            rip    0x9ef0fac
            rflags 0x10246
            cs     0x2b
            fs     0x0
            gs     0x0
            exit status 2
        trace_test.go:553: exit status 1

— watchflakes

[mknyszek]

Fixed as of https://go.dev/cl/546636.

[gopherbot]

Found new dashboard test flakes for:

#!watchflakes
default <- pkg == "internal/trace/v2" && test == "TestTraceStress"

2024-01-15 21:21 netbsd-arm-bsiegert go@b44f6378 internal/trace/v2.TestTraceStress (log)

--- FAIL: TestTraceStress (55.19s)
    --- FAIL: TestTraceStress/Default (55.19s)
        trace_test.go:551: stderr: runtime/cgo: pthread_create failed: Cannot allocate memory
            SIGABRT: abort
            PC=0x7be10dd0 m=339 sigcode=4294967291

            goroutine 0 gp=0x137c7e8 m=339 mp=0x1418b08 [idle]:
            runtime: g 0 gp=0x137c7e8: unknown pc 0x7be10dd0
            stack: frame={sp:0x20fbfe38, fp:0x0} stack=[0x20bc03a4,0x20fbffa4)
            0x20fbfdb8:  0x00000001  0x00000000  0x0e66fe16  0x7bef9c00 
...
            r10     0x137c7e8
            fp      0x1e54cc
            ip      0x7be10dcc
            sp      0x20fbfe38
            lr      0x7be0f99c
            pc      0x7be10dd0
            cpsr    0x400d0010
            fault   0x0
            exit status 2
        trace_test.go:553: exit status 1

— watchflakes

[mknyszek]

CC @golang/netbsd