internal/trace/v2: TestTraceGCStress failures

[gopherbot]

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

Issue created automatically to collect these failures.

Example (log):

--- FAIL: TestTraceGCStress (2.92s)
    --- FAIL: TestTraceGCStress/AllocFree (0.67s)
        trace_test.go:577: stderr: SIGSEGV: segmentation violation
            PC=0x80a1b1b m=17 sigcode=1 addr=0xf7865000

            goroutine 0 gp=0x98825a8 m=17 mp=0x9e80f08 [idle]:
            runtime.traceAdvance.func6()
            	/workdir/go/src/runtime/trace.go:667 +0xab fp=0xa313fdc sp=0xa313fc0 pc=0x80a1b1b
            runtime.systemstack(0x8825a8)
            	/workdir/go/src/runtime/asm_386.s:374 +0x41 fp=0xa313fe0 sp=0xa313fdc pc=0x80b5691
...
            esi    0xffff0000
            ebp    0x81a7bd8
            esp    0xa313fc0
            eip    0x80a1b1b
            eflags 0x10286
            cs     0x23
            fs     0x0
            gs     0x63
            exit status 2
        trace_test.go:579: exit status 1

— watchflakes

[gopherbot]

Found new dashboard test flakes for:

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

2024-05-14 17:18 linux-386-longtest go@0767ffdf internal/trace/v2.TestTraceGCStress (log)

--- FAIL: TestTraceGCStress (2.92s)
    --- FAIL: TestTraceGCStress/AllocFree (0.67s)
        trace_test.go:577: stderr: SIGSEGV: segmentation violation
            PC=0x80a1b1b m=17 sigcode=1 addr=0xf7865000

            goroutine 0 gp=0x98825a8 m=17 mp=0x9e80f08 [idle]:
            runtime.traceAdvance.func6()
            	/workdir/go/src/runtime/trace.go:667 +0xab fp=0xa313fdc sp=0xa313fc0 pc=0x80a1b1b
            runtime.systemstack(0x8825a8)
            	/workdir/go/src/runtime/asm_386.s:374 +0x41 fp=0xa313fe0 sp=0xa313fdc pc=0x80b5691
...
            esi    0xffff0000
            ebp    0x81a7bd8
            esp    0xa313fc0
            eip    0x80a1b1b
            eflags 0x10286
            cs     0x23
            fs     0x0
            gs     0x63
            exit status 2
        trace_test.go:579: exit status 1

— watchflakes