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runtime: lock ordering problem between assistQueue and mspanSpecial #39022

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bcmills opened this issue May 12, 2020 · 1 comment
Closed

runtime: lock ordering problem between assistQueue and mspanSpecial #39022

bcmills opened this issue May 12, 2020 · 1 comment
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FrozenDueToAge NeedsInvestigation Someone must examine and confirm this is a valid issue and not a duplicate of an existing one. release-blocker
Milestone
Go1.15

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@bcmills
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bcmills commented May 12, 2020

https://build.golang.org/log/8e91ad619015035d7f1318856b68de9092b7c4e0

--- FAIL: TestTestVetRebuild (0.20s)
    go_test.go:2511: running testgo [test b]
    go_test.go:2511: standard error:
    go_test.go:2511: 59214  ======
        0 : assistQueue 4 0xdcfb78
        1 : mspanSpecial 21 0x7f12302bf720
        fatal error: lock ordering problem
        
        runtime stack:
        runtime.throw(0xa3da16, 0x15)
        	/workdir/go/src/runtime/panic.go:1116 +0x72
        runtime.checkRanks(0xc0001f4600, 0x4, 0x15)
        	/workdir/go/src/runtime/lockrank_on.go:137 +0x27e
        runtime.lockWithRank.func1()
        	/workdir/go/src/runtime/lockrank_on.go:79 +0xbc
        runtime.lockWithRank(0x7f12302bf720, 0x15)
        	/workdir/go/src/runtime/lockrank_on.go:68 +0x8e
        runtime.lock(...)
        	/workdir/go/src/runtime/lock_futex.go:47
        runtime.addspecial(0xc0001a8480, 0x7f1205f32150, 0x7f1205e70a38)
        	/workdir/go/src/runtime/mheap.go:1674 +0xa5
        runtime.setprofilebucket(0xc0001a8480, 0x7f1206128b88)
        	/workdir/go/src/runtime/mheap.go:1826 +0x8d
        runtime.mProf_Malloc.func1()
        	/workdir/go/src/runtime/mprof.go:357 +0x33
        runtime.mProf_Malloc(0xc0001a8480, 0x180)
        	/workdir/go/src/runtime/mprof.go:356 +0x1a9
        runtime.profilealloc(0xc000080c00, 0xc0001a8480, 0x180)
        	/workdir/go/src/runtime/malloc.go:1234 +0x70
        runtime.mallocgc(0x180, 0xa2fde0, 0x1, 0x7f1205e70ce8)
        	/workdir/go/src/runtime/malloc.go:1138 +0x4ab
        runtime.newobject(0xa2fde0, 0xad6ac62b882dd4ec)
        	/workdir/go/src/runtime/malloc.go:1193 +0x38
        runtime.malg(0xc0ffffffff, 0xc000081400)
        	/workdir/go/src/runtime/proc.go:3442 +0x31
        runtime.allocm(0xc000033000, 0xa801f8, 0xc0001f4600)
        	/workdir/go/src/runtime/proc.go:1454 +0x172
        runtime.newm(0xa801f8, 0xc000033000)
        	/workdir/go/src/runtime/proc.go:1761 +0x39
        runtime.startm(0x0, 0xc00059a101)
        	/workdir/go/src/runtime/proc.go:1926 +0x13d
        runtime.wakep()
        	/workdir/go/src/runtime/proc.go:2013 +0x66
        runtime.ready(0xc00059a180, 0x0, 0x428200)
        	/workdir/go/src/runtime/proc.go:693 +0xb6
        runtime.gcFlushBgCredit(0x7d0)
        	/workdir/go/src/runtime/mgcmark.go:757 +0x9b
        runtime.gcDrain(0xc000036e98, 0x7)
        	/workdir/go/src/runtime/mgcmark.go:1150 +0x2fd
        runtime.gcBgMarkWorker.func2()
        	/workdir/go/src/runtime/mgc.go:1981 +0x185
        runtime.systemstack(0x0)
        	/workdir/go/src/runtime/asm_amd64.s:370 +0x66
        runtime.mstart()
        	/workdir/go/src/runtime/proc.go:1100
        
        goroutine 67 [GC worker (idle)]:
        runtime.systemstack_switch()
        	/workdir/go/src/runtime/asm_amd64.s:330 fp=0xc000038760 sp=0xc000038758 pc=0x46b760
        runtime.gcBgMarkWorker(0xc000035800)
        	/workdir/go/src/runtime/mgc.go:1945 +0x1be fp=0xc0000387d8 sp=0xc000038760 pc=0x41f5de
        runtime.goexit()
        	/workdir/go/src/runtime/asm_amd64.s:1374 +0x1 fp=0xc0000387e0 sp=0xc0000387d8 pc=0x46d541
        created by runtime.gcBgMarkStartWorkers
        	/workdir/go/src/runtime/mgc.go:1839 +0x77
        59214  ======
        0 : assistQueue 4 0xdcfb78
        1 : mspanSpecial 21 0x7f12302bf720
        2 : allg 10 0xe02db0
        fatal error: lock ordering problem
        panic during panic
        
        runtime stack:
        runtime.throw(0xa3da16, 0x15)
        	/workdir/go/src/runtime/panic.go:1116 +0x72
        runtime.checkRanks(0xc0001f4600, 0x15, 0xa)
        	/workdir/go/src/runtime/lockrank_on.go:137 +0x27e
        runtime.lockWithRank.func1()
        	/workdir/go/src/runtime/lockrank_on.go:79 +0xbc
        runtime.lockWithRank(0xe02db0, 0xa)
        	/workdir/go/src/runtime/lockrank_on.go:68 +0x8e
        runtime.lock(...)
        	/workdir/go/src/runtime/lock_futex.go:47
        runtime.tracebackothers(0xc0001f4600)
        	/workdir/go/src/runtime/traceback.go:929 +0x93
        runtime.dopanic_m(0xc0001f4600, 0x4378d2, 0x7f1205e708b8, 0x1)
        	/workdir/go/src/runtime/panic.go:1322 +0x2dd
        runtime.fatalthrow.func1()
        	/workdir/go/src/runtime/panic.go:1171 +0x5f
        runtime.fatalthrow()
        	/workdir/go/src/runtime/panic.go:1168 +0x57
        runtime.throw(0xa3da16, 0x15)
        	/workdir/go/src/runtime/panic.go:1116 +0x72
        runtime.checkRanks(0xc0001f4600, 0x4, 0x15)
        	/workdir/go/src/runtime/lockrank_on.go:137 +0x27e
        runtime.lockWithRank.func1()
        	/workdir/go/src/runtime/lockrank_on.go:79 +0xbc
        runtime.lockWithRank(0x7f12302bf720, 0x15)
        	/workdir/go/src/runtime/lockrank_on.go:68 +0x8e
        runtime.lock(...)
        	/workdir/go/src/runtime/lock_futex.go:47
        runtime.addspecial(0xc0001a8480, 0x7f1205f32150, 0x7f1205e70a38)
        	/workdir/go/src/runtime/mheap.go:1674 +0xa5
        runtime.setprofilebucket(0xc0001a8480, 0x7f1206128b88)
        	/workdir/go/src/runtime/mheap.go:1826 +0x8d
        runtime.mProf_Malloc.func1()
        	/workdir/go/src/runtime/mprof.go:357 +0x33
        runtime.mProf_Malloc(0xc0001a8480, 0x180)
        	/workdir/go/src/runtime/mprof.go:356 +0x1a9
        runtime.profilealloc(0xc000080c00, 0xc0001a8480, 0x180)
        	/workdir/go/src/runtime/malloc.go:1234 +0x70
        runtime.mallocgc(0x180, 0xa2fde0, 0x1, 0x7f1205e70ce8)
        	/workdir/go/src/runtime/malloc.go:1138 +0x4ab
        runtime.newobject(0xa2fde0, 0xad6ac62b882dd4ec)
        	/workdir/go/src/runtime/malloc.go:1193 +0x38
        runtime.malg(0xc0ffffffff, 0xc000081400)
        	/workdir/go/src/runtime/proc.go:3442 +0x31
        runtime.allocm(0xc000033000, 0xa801f8, 0xc0001f4600)
        	/workdir/go/src/runtime/proc.go:1454 +0x172
        runtime.newm(0xa801f8, 0xc000033000)
        	/workdir/go/src/runtime/proc.go:1761 +0x39
        runtime.startm(0x0, 0xc00059a101)
        	/workdir/go/src/runtime/proc.go:1926 +0x13d
        runtime.wakep()
        	/workdir/go/src/runtime/proc.go:2013 +0x66
        runtime.ready(0xc00059a180, 0x0, 0x428200)
        	/workdir/go/src/runtime/proc.go:693 +0xb6
        runtime.gcFlushBgCredit(0x7d0)
        	/workdir/go/src/runtime/mgcmark.go:757 +0x9b
        runtime.gcDrain(0xc000036e98, 0x7)
        	/workdir/go/src/runtime/mgcmark.go:1150 +0x2fd
        runtime.gcBgMarkWorker.func2()
        	/workdir/go/src/runtime/mgc.go:1981 +0x185
        runtime.systemstack(0x0)
        	/workdir/go/src/runtime/asm_amd64.s:370 +0x66
        runtime.mstart()
        	/workdir/go/src/runtime/proc.go:1100
        
    go_test.go:2511: go [test b] failed unexpectedly in /workdir/go/src/cmd/go: exit status 2
FAIL
2020/05/12 15:11:13 unexpected files left in tmpdir: [go-build124149088 go-build731527877]
FAIL	cmd/go	45.168s

CC @danscales @mknyszek
@bcmills bcmills added NeedsInvestigation Someone must examine and confirm this is a valid issue and not a duplicate of an existing one. release-blocker labels May 12, 2020
@bcmills bcmills added this to the Go1.15 milestone May 12, 2020
@danscales danscales self-assigned this May 12, 2020
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Change https://golang.org/cl/233599 mentions this issue: runtime: add a lock partial order edge (assistQueue -> mspanSpecial)

@golang golang locked and limited conversation to collaborators May 14, 2021
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