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runtime: Increase GC concurrency commit results in crash. #9560

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dajohi opened this issue Jan 10, 2015 · 1 comment
Closed

runtime: Increase GC concurrency commit results in crash. #9560

dajohi opened this issue Jan 10, 2015 · 1 comment
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@dajohi
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dajohi commented Jan 10, 2015

Commit db7fd1c causes a runtime failure on startup of btcd. The previous commit of f21ee1e works fine.

This is on OpenBSD 5.7-beta as of this morning.

16:06:18 2015-01-10 [INF] BTCD: Version 0.9.0-beta
16:06:18 2015-01-10 [INF] BTCD: Profile server listening on :6061
16:06:18 2015-01-10 [INF] BTCD: Loading block database from '/btcd/testnet/blocks_leveldb'
16:06:18 2015-01-10 [INF] BTCD: Block database loaded with block height 317698
16:06:18 2015-01-10 [INF] BMGR: Generating initial block node index.  This may take a while...
runtime:greyobject: checkmarks finds unexpected unmarked object obj=0xc208b81060, mbits->bits=0x1 *mbits->bitp=0xf9
runtime: found obj at *(0xc208b35a40+0x8)
runtime:greyobject Span: obj=0xc208b81060 k=0x61045c0 s.start=0xc208b80000 s.limit=0xc208b82000 s.sizeclass=1 s.elemsize=8
 *(obj+0) = 0xc208b35b20
fatal error: checkmark found unmarked object
runtime stack:
runtime.throw(0xb92ed0, 0x1f)
        /home/dhill/git/go/src/runtime/panic.go:508 +0x98 fp=0x297018270 sp=0x297018258
runtime.greyobject(0xc208b81060, 0xc208b35a40, 0x8, 0x297018360, 0x2a04d9000, 0x2a04d9000)
        /home/dhill/git/go/src/runtime/mgc.go:440 +0x2c9 fp=0x2970182d0 sp=0x297018270
runtime.scanobject(0xc208b35a40, 0xca5c0, 0x0, 0x2a04d9000, 0x2a04d9000)
        /home/dhill/git/go/src/runtime/mgc.go:573 +0x3f0 fp=0x297018380 sp=0x2970182d0
runtime.drainworkbuf(0x2a04d9000, 0x0)
        /home/dhill/git/go/src/runtime/mgc.go:650 +0x184 fp=0x2970183b0 sp=0x297018380
runtime.scanblock(0xc208439608, 0x28, 0xc39510)
        /home/dhill/git/go/src/runtime/mgc.go:610 +0xe5 fp=0x2970183f8 sp=0x2970183b0
runtime.scanframe(0x297018548, 0x0, 0x101)
        /home/dhill/git/go/src/runtime/mgc.go:998 +0x1d0 fp=0x297018490 sp=0x2970183f8
runtime.gentraceback(0x48a220, 0xc2084393f8, 0x0, 0xc208000240, 0x0, 0x0, 0x7fffffff, 0xc6d050, 0x0, 0x0, ...)
        /home/dhill/git/go/src/runtime/traceback.go:282 +0x7cd fp=0x2970185a0 sp=0x297018490
runtime.scanstack(0xc208000240)
        /home/dhill/git/go/src/runtime/mgc.go:1032 +0x214 fp=0x297018618 sp=0x2970185a0
runtime.gcphasework(0xc208000240)
        /home/dhill/git/go/src/runtime/mgc.go:1178 +0x9c fp=0x297018630 sp=0x297018618
runtime.stopg(0xc208000240, 0x1)
        /home/dhill/git/go/src/runtime/proc1.go:447 +0x91 fp=0x297018650 sp=0x297018630
runtime.markroot(0xc20800e000, 0x5)
        /home/dhill/git/go/src/runtime/mgc.go:747 +0x161 fp=0x2970186c0 sp=0x297018650
runtime.parfordo(0xc20800e000)
        /home/dhill/git/go/src/runtime/parfor.go:84 +0x1af fp=0x297018730 sp=0x2970186c0
runtime.gchelper()
        /home/dhill/git/go/src/runtime/mgc.go:1560 +0x4b fp=0x297018760 sp=0x297018730
runtime.stopm()
        /home/dhill/git/go/src/runtime/proc1.go:1052 +0x164 fp=0x297018788 sp=0x297018760
runtime.exitsyscall0(0xc2080b0b40)
        /home/dhill/git/go/src/runtime/proc1.go:1859 +0x153 fp=0x2970187b8 sp=0x297018788
runtime.mcall(0x2d99ebecc)
        /home/dhill/git/go/src/runtime/asm_amd64.s:187 +0x5a fp=0x2970187c8 sp=0x2970187b8

goroutine 1 [runnable]:
runtime.newobject(0xa8de00, 0xc20839fb40)
        /home/dhill/git/go/src/runtime/malloc.go:413 fp=0xc208439400 sp=0xc2084393f8
github.com/conformal/btcdb/ldb.(*LevelDb).FetchBlockHeaderBySha(0xc20806e000, 0xc20839fb40, 0x0, 0x0, 0x0)
        /home/dhill/.go/src/github.com/conformal/btcdb/ldb/block.go:64 +0x151 fp=0xc208439498 sp=0xc208439400
github.com/conformal/btcchain.(*BlockChain).loadBlockNode(0xc208086320, 0xc20839fb40, 0xc2083b5b20, 0x0, 0x0)
        /home/dhill/.go/src/github.com/conformal/btcchain/chain.go:404 +0x7d fp=0xc208439608 sp=0xc208439498
github.com/conformal/btcchain.(*BlockChain).GenerateInitialIndex(0xc208086320, 0x0, 0x0)
        /home/dhill/.go/src/github.com/conformal/btcchain/chain.go:381 +0x279 fp=0xc208439728 sp=0xc208439608
main.newBlockManager(0xc2080b1200, 0xc2080b1308, 0x0, 0x0)
        /home/dhill/.go/src/github.com/conformal/btcd/blockmanager.go:1366 +0x404 fp=0xc2084398f8 sp=0xc208439728
main.newServer(0xc2080b42a0, 0x2, 0x2, 0x2a04de9d0, 0xc20806e000, 0xf59e60, 0x8, 0x0, 0x0)
        /home/dhill/.go/src/github.com/conformal/btcd/server.go:1236 +0x110c fp=0xc208439e30 sp=0xc2084398f8
main.btcdMain(0x0, 0x0, 0x0)
        /home/dhill/.go/src/github.com/conformal/btcd/btcd.go:91 +0x805 fp=0xc208439f40 sp=0xc208439e30
main.main()
        /home/dhill/.go/src/github.com/conformal/btcd/btcd.go:151 +0x62 fp=0xc208439f98 sp=0xc208439f40
runtime.main()
        /home/dhill/git/go/src/runtime/proc.go:86 +0x1d3 fp=0xc208439fe0 sp=0xc208439f98
runtime.goexit()
        /home/dhill/git/go/src/runtime/asm_amd64.s:2430 +0x1 fp=0xc208439fe8 sp=0xc208439fe0

goroutine 2 [force gc (idle)]:
runtime.gopark(0xc6d028, 0xf62a30, 0xb34650, 0xf)
        /home/dhill/git/go/src/runtime/proc.go:151 +0x108 fp=0xc208018798 sp=0xc208018768
runtime.goparkunlock(0xf62a30, 0xb34650, 0xf)
        /home/dhill/git/go/src/runtime/proc.go:157 +0x48 fp=0xc2080187c0 sp=0xc208018798
runtime.forcegchelper()
        /home/dhill/git/go/src/runtime/proc.go:120 +0xce fp=0xc2080187e0 sp=0xc2080187c0
runtime.goexit()
        /home/dhill/git/go/src/runtime/asm_amd64.s:2430 +0x1 fp=0xc2080187e8 sp=0xc2080187e0
created by runtime.init·4
        /home/dhill/git/go/src/runtime/proc.go:108 +0x33
goroutine 3 [garbage collection]:
runtime.systemstack_switch()
        /home/dhill/git/go/src/runtime/asm_amd64.s:199 fp=0xc208018f48 sp=0xc208018f40
runtime.gcwork(0x0)
        /home/dhill/git/go/src/runtime/malloc.go:583 +0x2b9 fp=0xc208018fc0 sp=0xc208018f48
runtime.backgroundgc()
        /home/dhill/git/go/src/runtime/mgc0.go:87 +0x62 fp=0xc208018fe0 sp=0xc208018fc0
runtime.goexit()
        /home/dhill/git/go/src/runtime/asm_amd64.s:2430 +0x1 fp=0xc208018fe8 sp=0xc208018fe0
created by runtime.gogc
        /home/dhill/git/go/src/runtime/malloc.go:501 +0xe2

goroutine 4 [finalizer wait]:
runtime.gopark(0xc6d028, 0xf77d28, 0xb33af0, 0xe)
        /home/dhill/git/go/src/runtime/proc.go:151 +0x108 fp=0xc208019748 sp=0xc208019718
runtime.goparkunlock(0xf77d28, 0xb33af0, 0xe)
        /home/dhill/git/go/src/runtime/proc.go:157 +0x48 fp=0xc208019770 sp=0xc208019748
runtime.runfinq()
        /home/dhill/git/go/src/runtime/malloc.go:959 +0xb7 fp=0xc2080197e0 sp=0xc208019770
runtime.goexit()
        /home/dhill/git/go/src/runtime/asm_amd64.s:2430 +0x1 fp=0xc2080197e8 sp=0xc2080197e0
created by runtime.createfing
        /home/dhill/git/go/src/runtime/malloc.go:939 +0x68

....
@minux
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minux commented Jan 10, 2015

We know that issue and people are working hard on it.
See #9309, Russ doesn't want issues opened for this.

The GC concurrency CL just exposes the underlying
issue better.

PS: Don't use tip in production.

@minux minux closed this as completed Jan 10, 2015
@mikioh mikioh changed the title Increase GC concurrency commit results in crash. runtime: Increase GC concurrency commit results in crash. Jan 11, 2015
@golang golang locked and limited conversation to collaborators Jun 25, 2016
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