runtime/pprof: TestLabelSystemstack failures

[gopherbot]

#!watchflakes
post <- pkg == "runtime/pprof" && test == "TestLabelSystemstack"

Bug automatically created to track these flakes.

— watchflakes

[gopherbot]

Found new matching flaky dashboard failures for:

#!watchflakes
post <- pkg == "runtime/pprof" && test == "TestLabelSystemstack"

2022-09-06 15:49 linux-amd64-longtest go@e3885c4e runtime/pprof.TestLabelSystemstack (log)

--- FAIL: TestLabelSystemstack (5.14s)
    pprof_test.go:539: total 5783 CPU profile samples collected:
        17: 0x420403 (runtime.(*gcControllerState).commit:1283) 0x420a53 (runtime.gcControllerCommit:1542) 0x4204a4 (runtime.setGCPercent.func1:1310) 0x4665a8 (runtime.systemstack:492) 0x463015 (runtime/debug.setGCPercent:1307) 0x54e031 (runtime/debug.SetGCPercent:96 runtime/pprof.labelHog:1902) 0x54e21b (runtime/pprof.parallelLabelHog.func1:1915) labels: map[key:[value]]

        1: 0x468386 (runtime.procyield:756) 0x40b232 (runtime.lock2:88) 0x43e693 (runtime.lockWithRank:22 runtime.lock:48 runtime.goschedImpl:3424) 0x43e870 (runtime.gosched_m:3436) 0x466522 (runtime.mcall:448) labels: map[]

        7: 0x40b267 (runtime.lock2:98) 0x420455 (runtime.lockWithRank:22 runtime.lock:48 runtime.setGCPercent.func1:1308) 0x4665a8 (runtime.systemstack:492) 0x463015 (runtime/debug.setGCPercent:1307) 0x54e031 (runtime/debug.SetGCPercent:96 runtime/pprof.labelHog:1902) 0x54e21b (runtime/pprof.parallelLabelHog.func1:1915) labels: map[key:[value]]

        1082: 0x46a523 (runtime.futex:560) 0x431295 (runtime.futexsleep:69) 0x40b1f8 (runtime.lock2:107) 0x420455 (runtime.lockWithRank:22 runtime.lock:48 runtime.setGCPercent.func1:1308) 0x4665a8 (runtime.systemstack:492) 0x463015 (runtime/debug.setGCPercent:1307) 0x54e031 (runtime/debug.SetGCPercent:96 runtime/pprof.labelHog:1902) 0x54e21b (runtime/pprof.parallelLabelHog.func1:1915) labels: map[key:[value]]

...
        1: 0x420bf3 (runtime.gcPaceScavenger:182) 0x420aa6 (runtime.gcControllerCommit:1557) 0x4204a4 (runtime.setGCPercent.func1:1310) 0x4665a8 (runtime.systemstack:492) 0x463015 (runtime/debug.setGCPercent:1307) 0x54e031 (runtime/debug.SetGCPercent:96 runtime/pprof.labelHog:1902) 0x54e21b (runtime/pprof.parallelLabelHog.func1:1915) labels: map[key:[value]]

        1: 0x40b2dd (runtime.lock2:85) 0x420455 (runtime.lockWithRank:22 runtime.lock:48 runtime.setGCPercent.func1:1308) 0x4665a8 (runtime.systemstack:492) 0x463015 (runtime/debug.setGCPercent:1307) 0x54e031 (runtime/debug.SetGCPercent:96 runtime/pprof.labelHog:1902) 0x54e21b (runtime/pprof.parallelLabelHog.func1:1915) labels: map[key:[value]]

        1: 0x42003d (runtime/internal/atomic.(*Uint64).Load:313 runtime.(*gcControllerState).heapGoalInternal:963) 0x420184 (runtime.(*gcControllerState).trigger:1138) 0x420a84 (runtime.gcControllerCommit:1555) 0x4204a4 (runtime.setGCPercent.func1:1310) 0x4665a8 (runtime.systemstack:492) 0x463015 (runtime/debug.setGCPercent:1307) 0x54e031 (runtime/debug.SetGCPercent:96 runtime/pprof.labelHog:1902) 0x54e21b (runtime/pprof.parallelLabelHog.func1:1915) labels: map[key:[value]]

        1: labels: map[key:[value]]

    pprof_test.go:610: runtime.systemstack;key=value: 5739
    pprof_test.go:1885: Sample labeled got true want false: 

— watchflakes

[gopherbot]

Found new dashboard test flakes for:

#!watchflakes
post <- pkg == "runtime/pprof" && test == "TestLabelSystemstack"

2022-09-26 20:52 linux-amd64-nounified go@84f95aa8 runtime/pprof.TestLabelSystemstack (log)

--- FAIL: TestLabelSystemstack (0.31s)
    pprof_test.go:539: total 110 CPU profile samples collected:
        23: 0x46a923 (runtime.futex:560) 0x431e75 (runtime.futexwakeup:82) 0x40b572 (runtime.unlock2:121) 0x420b12 (runtime.unlockWithRank:32 runtime.unlock:112 runtime.setGCPercent.func1:1311) 0x4669a8 (runtime.systemstack:492) 0x463325 (runtime/debug.setGCPercent:1307) 0x5515b1 (runtime/debug.SetGCPercent:96 runtime/pprof.labelHog:1902) 0x55179b (runtime/pprof.parallelLabelHog.func1:1915) labels: map[key:[value]]

        16: 0x46aa87 (runtime.osyield:658) 0x40b446 (runtime.lock2:98) 0x420ab5 (runtime.lockWithRank:22 runtime.lock:48 runtime.setGCPercent.func1:1308) 0x4669a8 (runtime.systemstack:492) 0x463325 (runtime/debug.setGCPercent:1307) 0x5515b1 (runtime/debug.SetGCPercent:96 runtime/pprof.labelHog:1902) 0x55179b (runtime/pprof.parallelLabelHog.func1:1915) labels: map[key:[value]]

        23: 0x46a923 (runtime.futex:560) 0x431d95 (runtime.futexsleep:69) 0x40b3d8 (runtime.lock2:107) 0x420ab5 (runtime.lockWithRank:22 runtime.lock:48 runtime.setGCPercent.func1:1308) 0x4669a8 (runtime.systemstack:492) 0x463325 (runtime/debug.setGCPercent:1307) 0x5515b1 (runtime/debug.SetGCPercent:96 runtime/pprof.labelHog:1902) 0x55179b (runtime/pprof.parallelLabelHog.func1:1915) labels: map[key:[value]]

        32: 0x468786 (runtime.procyield:756) 0x40b412 (runtime.lock2:88) 0x420ab5 (runtime.lockWithRank:22 runtime.lock:48 runtime.setGCPercent.func1:1308) 0x4669a8 (runtime.systemstack:492) 0x463325 (runtime/debug.setGCPercent:1307) 0x5515b1 (runtime/debug.SetGCPercent:96 runtime/pprof.labelHog:1902) 0x55179b (runtime/pprof.parallelLabelHog.func1:1915) labels: map[key:[value]]

...
        1: 0x468784 (runtime.procyield:755) 0x40b412 (runtime.lock2:88) 0x420ab5 (runtime.lockWithRank:22 runtime.lock:48 runtime.setGCPercent.func1:1308) 0x4669a8 (runtime.systemstack:492) 0x463325 (runtime/debug.setGCPercent:1307) 0x5515b1 (runtime/debug.SetGCPercent:96 runtime/pprof.labelHog:1902) 0x55179b (runtime/pprof.parallelLabelHog.func1:1915) labels: map[key:[value]]

        1: 0x4212a8 (runtime.gcPaceScavenger:208) 0x421106 (runtime.gcControllerCommit:1557) 0x420b04 (runtime.setGCPercent.func1:1310) 0x4669a8 (runtime.systemstack:492) 0x463325 (runtime/debug.setGCPercent:1307) 0x5515b1 (runtime/debug.SetGCPercent:96 runtime/pprof.labelHog:1902) 0x55179b (runtime/pprof.parallelLabelHog.func1:1915) labels: map[key:[value]]

        1: 0x421102 (runtime.gcControllerCommit:1557) 0x420b04 (runtime.setGCPercent.func1:1310) 0x4669a8 (runtime.systemstack:492) 0x463325 (runtime/debug.setGCPercent:1307) 0x5515b1 (runtime/debug.SetGCPercent:96 runtime/pprof.labelHog:1902) 0x55179b (runtime/pprof.parallelLabelHog.func1:1915) labels: map[key:[value]]

        1: labels: map[key:[value]]

    pprof_test.go:610: runtime.systemstack;key=value: 109
    pprof_test.go:1885: Sample labeled got true want false: 

— watchflakes

[mknyszek]

This may be a duplicate of #51550.

[cherrymui]

Close as a dup.