zhangguanzhang's Blog

docker containerd 不定时的 segfault 的一次处理过程

linux segfault
字数统计: 4.4k阅读时长: 25 min
2022/04/22

客户环境 docker 和 containerd 启动时不时 segment fault 的一次处理过程。

由来

问题拉我处理是 04/15 号，现象是客户的根分区被撑爆了，后台 tty 进去看了下是根目录充满了 core.$pid 的 coredump 文件。然后清理后重启发现很多容器起不来。然后喊我来看下。

处理过程

客户系统是 centos7.9 ，先使用 systemctl status docker 看了下 docker 运行一段时间后就崩了，前台启动调试下：

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$ dockerd --version
Docker version 19.03.14, build 5eb3275
$ systemctl stop kubelet docker
$ dockerd --debug

然后发现每次 dockerd 退出日志不一样，有时候是 segment fault，有时候报错无法通过 /var/run/docker/containerd/containerd.sock 连接 containerd，该 sock 文件不存在，根据这个报错可以看出来 containerd 无法启动。可以通过 源码 得知，如果没启动 containerd ，docker 则会 os.Exec 起一个 containerd 。

我们的 docker 是官方的 static bin 安装的，如果是官方包管理安装的话，containerd 会由 systemd 启动，docker bin 的方式的话，会由 dockerd 使用 exec 方式启动一个 containerd，找个同版本的查询下 cmdline 后手动前台 debug log-level 启动下 containerd：

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$ containerd --config /var/run/docker/containerd/containerd.toml --log-level debug   
INFO[2022-04-15T14:14:01.755841221+08:00] starting containerd                           revision=ea765aba0d05254012b0b9e595e995c09186427f version=v1.3.9
DEBU[2022-04-15T14:14:01.755989919+08:00] changing OOM score to -500                   
INFO[2022-04-15T14:14:01.787587081+08:00] loading plugin "io.containerd.content.v1.content"...  type=io.containerd.content.v1
INFO[2022-04-15T14:14:01.787837808+08:00] loading plugin "io.containerd.snapshotter.v1.btrfs"...  type=io.containerd.snapshotter.v1
INFO[2022-04-15T14:14:01.790684367+08:00] skip loading plugin "io.containerd.snapshotter.v1.btrfs"...  error="path /data/kube/docker/containerd/daemon/io.containerd.snapshotter.v1.btrfs (xfs) must be a btrfs filesystem to be used with the btrfs snapshotter: skip plugin" type=io.containerd.snapshotter.v1
INFO[2022-04-15T14:14:01.790779651+08:00] loading plugin "io.containerd.snapshotter.v1.devmapper"...  type=io.containerd.snapshotter.v1
WARN[2022-04-15T14:14:01.790827944+08:00] failed to load plugin io.containerd.snapshotter.v1.devmapper  error="devmapper not configured"
INFO[2022-04-15T14:14:01.790850382+08:00] loading plugin "io.containerd.snapshotter.v1.aufs"...  type=io.containerd.snapshotter.v1
INFO[2022-04-15T14:14:01.793069978+08:00] skip loading plugin "io.containerd.snapshotter.v1.aufs"...  error="modprobe aufs failed: \"modprobe: FATAL: Module aufs not found.\\n\": exit status 1: skip plugin" type=io.containerd.snapshotter.v1
INFO[2022-04-15T14:14:01.793133838+08:00] loading plugin "io.containerd.snapshotter.v1.native"...  type=io.containerd.snapshotter.v1
INFO[2022-04-15T14:14:01.793229323+08:00] loading plugin "io.containerd.snapshotter.v1.overlayfs"...  type=io.containerd.snapshotter.v1
INFO[2022-04-15T14:14:01.793392157+08:00] loading plugin "io.containerd.snapshotter.v1.zfs"...  type=io.containerd.snapshotter.v1
INFO[2022-04-15T14:14:01.794994033+08:00] skip loading plugin "io.containerd.snapshotter.v1.zfs"...  error="path /data/kube/docker/containerd/daemon/io.containerd.snapshotter.v1.zfs must be a zfs filesystem to be used with the zfs snapshotter: skip plugin" type=io.containerd.snapshotter.v1
INFO[2022-04-15T14:14:01.795033213+08:00] loading plugin "io.containerd.metadata.v1.bolt"...  type=io.containerd.metadata.v1
WARN[2022-04-15T14:14:01.795068521+08:00] could not use snapshotter devmapper in metadata plugin  error="devmapper not configured"
INFO[2022-04-15T14:14:01.795097127+08:00] metadata content store policy set             policy=shared
INFO[2022-04-15T14:14:01.795925864+08:00] loading plugin "io.containerd.differ.v1.walking"...  type=io.containerd.differ.v1
INFO[2022-04-15T14:14:01.795966063+08:00] loading plugin "io.containerd.gc.v1.scheduler"...  type=io.containerd.gc.v1
INFO[2022-04-15T14:14:01.796083519+08:00] loading plugin "io.containerd.service.v1.containers-service"...  type=io.containerd.service.v1
INFO[2022-04-15T14:14:01.796116546+08:00] loading plugin "io.containerd.service.v1.content-service"...  type=io.containerd.service.v1
INFO[2022-04-15T14:14:01.796143806+08:00] loading plugin "io.containerd.service.v1.diff-service"...  type=io.containerd.service.v1
INFO[2022-04-15T14:14:01.796174035+08:00] loading plugin "io.containerd.service.v1.images-service"...  type=io.containerd.service.v1
INFO[2022-04-15T14:14:01.796201988+08:00] loading plugin "io.containerd.service.v1.leases-service"...  type=io.containerd.service.v1
INFO[2022-04-15T14:14:01.796236554+08:00] loading plugin "io.containerd.service.v1.namespaces-service"...  type=io.containerd.service.v1
INFO[2022-04-15T14:14:01.796274839+08:00] loading plugin "io.containerd.service.v1.snapshots-service"...  type=io.containerd.service.v1
INFO[2022-04-15T14:14:01.796309507+08:00] loading plugin "io.containerd.runtime.v1.linux"...  type=io.containerd.runtime.v1
DEBU[2022-04-15T14:14:01.796470242+08:00] loading tasks in namespace                    namespace=moby
ERRO[2022-04-15T14:14:01.796797091+08:00] connecting to shim                            error="dial unix \x00/containerd-shim/moby/427b5abebd744817fe9cf8c0aa2febadff17d5905e830d3236bb46fa58d6858b/shim.sock: connect: connection refused" id=427b5abebd744817fe9cf8c0aa2febadff17d5905e830d3236bb46fa58d6858b namespace=moby
WARN[2022-04-15T14:14:01.796844852+08:00] cleaning up after shim dead                   id=427b5abebd744817fe9cf8c0aa2febadff17d5905e830d3236bb46fa58d6858b namespace=moby
DEBU[2022-04-15T14:14:01.809292656+08:00] event published                               ns=moby topic=/tasks/exit type=containerd.events.TaskExit
DEBU[2022-04-15T14:14:01.810296940+08:00] event published                               ns=moby topic=/tasks/delete type=containerd.events.TaskDelete
ERRO[2022-04-15T14:14:01.810491037+08:00] connecting to shim                            error="dial unix /run/containerd/s/058682ed3ebcc6c9b8d37022b1d379d2d11dbf583467c8d834cc09b3d0c76fea: connect: connection refused" id=44d4a81a122079c684c2a45fcd412c8dc2eef3e4e3569ecae2332ac450b80076 namespace=moby
WARN[2022-04-15T14:14:01.810533770+08:00] cleaning up after shim dead                   id=44d4a81a122079c684c2a45fcd412c8dc2eef3e4e3569ecae2332ac450b80076 namespace=moby
DEBU[2022-04-15T14:14:01.823164929+08:00] event published                               ns=moby topic=/tasks/exit type=containerd.events.TaskExit
DEBU[2022-04-15T14:14:01.823795277+08:00] event published                               ns=moby topic=/tasks/delete type=containerd.events.TaskDelete
ERRO[2022-04-15T14:14:01.823953161+08:00] connecting to shim                            error="dial unix /run/containerd/s/96bd5e94f86fc8e5752989ee5f22f46924d7deea59c7b8ef11087186f81ca50b: connect: connection refused" id=52aa8ad1be01f3f947bcd2f03197771f1b965b0733f3d4026a58d77979618966 namespace=moby
WARN[2022-04-15T14:14:01.823995417+08:00] cleaning up after shim dead                   id=52aa8ad1be01f3f947bcd2f03197771f1b965b0733f3d4026a58d77979618966 namespace=moby
DEBU[2022-04-15T14:14:01.835741082+08:00] event published                               ns=moby topic=/tasks/exit type=containerd.events.TaskExit
DEBU[2022-04-15T14:14:01.836774408+08:00] event published                               ns=moby topic=/tasks/delete type=containerd.events.TaskDelete
ERRO[2022-04-15T14:14:01.836931317+08:00] connecting to shim                            error="dial unix \x00/containerd-shim/moby/6b1fb39b4c5ad46612b6755f652d608ef75b3374f719b08a67cac1b7f4ddf646/shim.sock: connect: connection refused" id=6b1fb39b4c5ad46612b6755f652d608ef75b3374f719b08a67cac1b7f4ddf646 namespace=moby
WARN[2022-04-15T14:14:01.836979896+08:00] cleaning up after shim dead                   id=6b1fb39b4c5ad46612b6755f652d608ef75b3374f719b08a67cac1b7f4ddf646 namespace=moby
DEBU[2022-04-15T14:14:01.849530967+08:00] event published                               ns=moby topic=/tasks/exit type=containerd.events.TaskExit
ERRO[2022-04-15T14:14:01.862000189+08:00] delete bundle                                 error="rename /data/kube/docker/containerd/daemon/io.containerd.runtime.v1.linux/moby/6b1fb39b4c5ad46612b6755f652d608ef75b3374f719b08a67cac1b7f4ddf646 /data/kube/docker/containerd/daemon/io.containerd.runtime.v1.linux/moby/.6b1fb39b4c5ad46612b6755f652d608ef75b3374f719b08a67cac1b7f4ddf646: file exists"
DEBU[2022-04-15T14:14:01.862166378+08:00] event published                               ns=moby topic=/tasks/delete type=containerd.events.TaskDelete
ERRO[2022-04-15T14:14:01.862300707+08:00] connecting to shim                            error="dial unix \x00/containerd-shim/moby/b49a6d51e1a8997440bbcb6e9267a76d8ce2f24a684454890ae98600de364f64/shim.sock: connect: connection refused" id=b49a6d51e1a8997440bbcb6e9267a76d8ce2f24a684454890ae98600de364f64 namespace=moby
WARN[2022-04-15T14:14:01.862334378+08:00] cleaning up after shim dead                   id=b49a6d51e1a8997440bbcb6e9267a76d8ce2f24a684454890ae98600de364f64 namespace=moby
DEBU[2022-04-15T14:14:01.877502812+08:00] event published                               ns=moby topic=/tasks/exit type=containerd.events.TaskExit
DEBU[2022-04-15T14:14:01.877994394+08:00] event published                               ns=moby topic=/tasks/delete type=containerd.events.TaskDelete
ERRO[2022-04-15T14:14:01.878143864+08:00] connecting to shim                            error="dial unix /run/containerd/s/b538e3e9b252cc635009139b544114a233b3cc34ca48925588da77aa15cdf90a: connect: connection refused" id=b902f9e634100578e9ab38eeaf9a27224d843035ae33a368d65efc071393bd2f namespace=moby
WARN[2022-04-15T14:14:01.878183396+08:00] cleaning up after shim dead                   id=b902f9e634100578e9ab38eeaf9a27224d843035ae33a368d65efc071393bd2f namespace=moby
DEBU[2022-04-15T14:14:01.895566880+08:00] event published                               ns=moby topic=/tasks/exit type=containerd.events.TaskExit
DEBU[2022-04-15T14:14:01.896242084+08:00] event published                               ns=moby topic=/tasks/delete type=containerd.events.TaskDelete
ERRO[2022-04-15T14:14:01.896450640+08:00] connecting to shim                            error="dial unix /run/containerd/s/4d17ae4e022c51c38d6eff249e4a50d6eaceba757f043204ae68b9382271b0da: connect: connection refused" id=dc31940495385987c90e96c333014f1ac7dc7eddb5e3f45acb19877c79e22893 namespace=moby
WARN[2022-04-15T14:14:01.896496784+08:00] cleaning up after shim dead                   id=dc31940495385987c90e96c333014f1ac7dc7eddb5e3f45acb19877c79e22893 namespace=moby
DEBU[2022-04-15T14:14:01.904116791+08:00] garbage collected                             d=7.541562ms
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fatal error: bad lfnode address
[signal SIGSEGV: segmentation violation code=0x80 addr=0x0 pc=0x45cf1f]

runtime stack:
runtime: unexpected return pc for runtime.lfnodeValidate called from 0x0
stack: frame={sp:0x7f5918d8f5d8, fp:0x7f5918d8f600} stack=[0x7f5918594148,0x7f5918d93d48)
00007f5918d8f4d8:  000000c000000900  01000000000003e8 
00007f5918d8f4e8:  0000000000000004  000000000000001f 
00007f5918d8f4f8:  000000000045cf1f <runtime.GoroutineProfile.func2+47>  0000000000000000 
00007f5918d8f508:  0000000000000080  00000000013f1515 
00007f5918d8f518:  00007f5918d8f560  000000000045d961 <runtime.fatalthrow.func1+97> 
00007f5918d8f528:  000000c000000900  0000000000430dd4 <runtime.throw+116> 
00007f5918d8f538:  00007f5918d8f5a8  0000000000000001 
00007f5918d8f548:  00007f5918d8f5a8  0000000000430dd4 <runtime.throw+116> 
00007f5918d8f558:  000000c000000900  00007f5918d8f598 
00007f5918d8f568:  0000000000430fa9 <runtime.fatalthrow+89>  00007f5918d8f578 
00007f5918d8f578:  000000000045d900 <runtime.fatalthrow.func1+0>  000000c000000900 
00007f5918d8f588:  0000000000430dd4 <runtime.throw+116>  00007f5918d8f5a8 
00007f5918d8f598:  00007f5918d8f5c8  0000000000430dd4 <runtime.throw+116> 
00007f5918d8f5a8:  00007f5918d8f5b0  000000000045d870 <runtime.throw.func1+0> 
00007f5918d8f5b8:  00000000013dce54  0000000000000012 
00007f5918d8f5c8:  00007f5918d8f608  000000000040beba <runtime.lfnodeValidate+170> 
00007f5918d8f5d8: <00000000013dce54  0000000000000012 
00007f5918d8f5e8:  00000000004317a0 <runtime.recordForPanic+304>  000000000274594b 
00007f5918d8f5f8: !0000000000000000 >0000000000000000 
00007f5918d8f608:  00007f5918d8f648  0000000000000000 
00007f5918d8f618:  00007f5918d8f650  00000000004317a0 <runtime.recordForPanic+304> 
00007f5918d8f628:  000000000274594b  0000000000000004 
00007f5918d8f638:  00007f5918d8f670  00000000004317a0 <runtime.recordForPanic+304> 
00007f5918d8f648:  00007f5918d8f668  000000000043183d <runtime.printlock+109> 
00007f5918d8f658:  00000000027445b0  000000c000074380 
00007f5918d8f668:  00007f5918d8f698  000000000045d8a6 <runtime.throw.func1+54> 
00007f5918d8f678:  0000000000431967 <runtime.gwrite+167>  0000000000000002 
00007f5918d8f688:  000000000000002a  00000000014054d6 
00007f5918d8f698:  00007f5918d8f6c8  0000000000430dad <runtime.throw+77> 
00007f5918d8f6a8:  00007f5918d8f6b0  000000000045d870 <runtime.throw.func1+0> 
00007f5918d8f6b8:  00000000014054d6  000000000000002a 
00007f5918d8f6c8:  00007f5918d8f6f8  0000000000446a60 <runtime.sigpanic+1152> 
00007f5918d8f6d8:  00000000014054d6  000000000000002a 
00007f5918d8f6e8:  00000000013c9053  0000000000000001 
00007f5918d8f6f8:  00007f5918d8f720 
runtime.throw(0x13dce54, 0x12)
        /usr/local/go/src/runtime/panic.go:774 +0x74
runtime: unexpected return pc for runtime.lfnodeValidate called from 0x0
stack: frame={sp:0x7f5918d8f5d8, fp:0x7f5918d8f600} stack=[0x7f5918594148,0x7f5918d93d48)
00007f5918d8f4d8:  000000c000000900  01000000000003e8 
00007f5918d8f4e8:  0000000000000004  000000000000001f 
00007f5918d8f4f8:  000000000045cf1f <runtime.GoroutineProfile.func2+47>  0000000000000000 
00007f5918d8f508:  0000000000000080  00000000013f1515 
00007f5918d8f518:  00007f5918d8f560  000000000045d961 <runtime.fatalthrow.func1+97> 
00007f5918d8f528:  000000c000000900  0000000000430dd4 <runtime.throw+116> 
00007f5918d8f538:  00007f5918d8f5a8  0000000000000001 
00007f5918d8f548:  00007f5918d8f5a8  0000000000430dd4 <runtime.throw+116> 
00007f5918d8f558:  000000c000000900  00007f5918d8f598 
00007f5918d8f568:  0000000000430fa9 <runtime.fatalthrow+89>  00007f5918d8f578 
00007f5918d8f578:  000000000045d900 <runtime.fatalthrow.func1+0>  000000c000000900 
00007f5918d8f588:  0000000000430dd4 <runtime.throw+116>  00007f5918d8f5a8 
00007f5918d8f598:  00007f5918d8f5c8  0000000000430dd4 <runtime.throw+116> 
00007f5918d8f5a8:  00007f5918d8f5b0  000000000045d870 <runtime.throw.func1+0> 
00007f5918d8f5b8:  00000000013dce54  0000000000000012 
00007f5918d8f5c8:  00007f5918d8f608  000000000040beba <runtime.lfnodeValidate+170> 
00007f5918d8f5d8: <00000000013dce54  0000000000000012 
00007f5918d8f5e8:  00000000004317a0 <runtime.recordForPanic+304>  000000000274594b 
00007f5918d8f5f8: !0000000000000000 >0000000000000000 
00007f5918d8f608:  00007f5918d8f648  0000000000000000 
00007f5918d8f618:  00007f5918d8f650  00000000004317a0 <runtime.recordForPanic+304> 
00007f5918d8f628:  000000000274594b  0000000000000004 
00007f5918d8f638:  00007f5918d8f670  00000000004317a0 <runtime.recordForPanic+304> 
00007f5918d8f648:  00007f5918d8f668  000000000043183d <runtime.printlock+109> 
00007f5918d8f658:  00000000027445b0  000000c000074380 
00007f5918d8f668:  00007f5918d8f698  000000000045d8a6 <runtime.throw.func1+54> 
00007f5918d8f678:  0000000000431967 <runtime.gwrite+167>  0000000000000002 
00007f5918d8f688:  000000000000002a  00000000014054d6 
00007f5918d8f698:  00007f5918d8f6c8  0000000000430dad <runtime.throw+77> 
00007f5918d8f6a8:  00007f5918d8f6b0  000000000045d870 <runtime.throw.func1+0> 
00007f5918d8f6b8:  00000000014054d6  000000000000002a 
00007f5918d8f6c8:  00007f5918d8f6f8  0000000000446a60 <runtime.sigpanic+1152> 
00007f5918d8f6d8:  00000000014054d6  000000000000002a 
00007f5918d8f6e8:  00000000013c9053  0000000000000001 
00007f5918d8f6f8:  00007f5918d8f720 
runtime.lfnodeValidate(0x0)
        /usr/local/go/src/runtime/lfstack.go:65 +0xaa

goroutine 1 [chan receive]:
github.com/containerd/containerd/vendor/github.com/containerd/go-runc.(*defaultMonitor).Wait(0x2744360, 0xc0002738c0, 0xc00035e4e0, 0x0, 0x0, 0x3d54454b434f)
        /tmp/tmp.0JSku0IZFM/src/github.com/containerd/containerd/vendor/github.com/containerd/go-runc/monitor.go:74 +0x50
github.com/containerd/containerd/vendor/github.com/containerd/go-runc.cmdOutput(0xc0002738c0, 0xc0002ee301, 0x0, 0x0, 0x0, 0x0, 0x0)
        /tmp/tmp.0JSku0IZFM/src/github.com/containerd/containerd/vendor/github.com/containerd/go-runc/runc.go:709 +0x14e
github.com/containerd/containerd/vendor/github.com/containerd/go-runc.(*Runc).runOrError(0xc00055ec80, 0xc0002738c0, 0xc0002cee40, 0xc00004ee40)
        /tmp/tmp.0JSku0IZFM/src/github.com/containerd/containerd/vendor/github.com/containerd/go-runc/runc.go:689 +0x186
github.com/containerd/containerd/vendor/github.com/containerd/go-runc.(*Runc).Delete(0xc00055ec80, 0x1bcd9e0, 0xc0002cee40, 0xc000016796, 0x40, 0xc00062cd77, 0x40, 0xc00055ec80)
        /tmp/tmp.0JSku0IZFM/src/github.com/containerd/containerd/vendor/github.com/containerd/go-runc/runc.go:302 +0x16a
github.com/containerd/containerd/runtime/v1/linux.(*Runtime).terminate(0xc000240960, 0x1bcd9e0, 0xc0002cee40, 0xc0002cea80, 0xc00010d5d1, 0x4, 0xc000016796, 0x40, 0x1, 0x1)
        /tmp/tmp.0JSku0IZFM/src/github.com/containerd/containerd/runtime/v1/linux/runtime.go:473 +0xfc
github.com/containerd/containerd/runtime/v1/linux.(*Runtime).cleanupAfterDeadShim(0xc000240960, 0x1bcd9e0, 0xc0002cee40, 0xc0002cea80, 0xc00010d5d1, 0x4, 0xc000016796, 0x40, 0x1b938c0, 0xc00003caf0)
        /tmp/tmp.0JSku0IZFM/src/github.com/containerd/containerd/runtime/v1/linux/runtime.go:432 +0x386
github.com/containerd/containerd/runtime/v1/linux.(*Runtime).loadTasks(0xc000240960, 0x1bcd960, 0xc000040098, 0xc00010d5d1, 0x4, 0x0, 0x0, 0xc00062e610, 0x439d71, 0xc000052500)
        /tmp/tmp.0JSku0IZFM/src/github.com/containerd/containerd/runtime/v1/linux/runtime.go:362 +0xa28
github.com/containerd/containerd/runtime/v1/linux.(*Runtime).restoreTasks(0xc000240960, 0x1bcd960, 0xc000040098, 0x1a9f5c0, 0xc000532540, 0x0, 0x0, 0xc00062e898)
        /tmp/tmp.0JSku0IZFM/src/github.com/containerd/containerd/runtime/v1/linux/runtime.go:298 +0x368
github.com/containerd/containerd/runtime/v1/linux.New(0xc00034ea80, 0xc000332c60, 0x2, 0x2, 0x1968f20)
        /tmp/tmp.0JSku0IZFM/src/github.com/containerd/containerd/runtime/v1/linux/runtime.go:125 +0x3db
github.com/containerd/containerd/plugin.(*Registration).Init(0xc00009a1e0, 0xc00034ea80, 0x18c2f40)
        /tmp/tmp.0JSku0IZFM/src/github.com/containerd/containerd/plugin/plugin.go:110 +0x3a
github.com/containerd/containerd/services/server.New(0x1bcd960, 0xc000040098, 0xc00055c480, 0x1, 0x1, 0xc0002079b0)
        /tmp/tmp.0JSku0IZFM/src/github.com/containerd/containerd/services/server/server.go:167 +0xcaa
github.com/containerd/containerd/cmd/containerd/command.App.func1(0xc000558580, 0x0, 0xc000162880)
        /tmp/tmp.0JSku0IZFM/src/github.com/containerd/containerd/cmd/containerd/command/main.go:177 +0x7fa
github.com/containerd/containerd/vendor/github.com/urfave/cli.HandleAction(0x1937d80, 0x1b71550, 0xc000558580, 0xc000558580, 0x0)
        /tmp/tmp.0JSku0IZFM/src/github.com/containerd/containerd/vendor/github.com/urfave/cli/app.go:523 +0xc0
github.com/containerd/containerd/vendor/github.com/urfave/cli.(*App).Run(0xc000536700, 0xc00003c050, 0x5, 0x5, 0x0, 0x0)
        /tmp/tmp.0JSku0IZFM/src/github.com/containerd/containerd/vendor/github.com/urfave/cli/app.go:285 +0x5e1
main.main()
        github.com/containerd/containerd/cmd/containerd/main.go:33 +0x51

goroutine 6 [syscall]:
os/signal.signal_recv(0x0)
        /usr/local/go/src/runtime/sigqueue.go:147 +0x9e
os/signal.loop()
        /usr/local/go/src/os/signal/signal_unix.go:23 +0x24
created by os/signal.init.0
        /usr/local/go/src/os/signal/signal_unix.go:29 +0x43

goroutine 7 [chan receive]:
github.com/containerd/containerd/vendor/k8s.io/klog.(*loggingT).flushDaemon(0x2721260)
        /tmp/tmp.0JSku0IZFM/src/github.com/containerd/containerd/vendor/k8s.io/klog/klog.go:1010 +0x8d
created by github.com/containerd/containerd/vendor/k8s.io/klog.init.0
        /tmp/tmp.0JSku0IZFM/src/github.com/containerd/containerd/vendor/k8s.io/klog/klog.go:411 +0xd8

goroutine 43 [select]:
github.com/containerd/containerd/cmd/containerd/command.handleSignals.func1(0xc000551380, 0xc000551320, 0x1bcd960, 0xc000040098, 0xc00054c300)
        /tmp/tmp.0JSku0IZFM/src/github.com/containerd/containerd/cmd/containerd/command/main_unix.go:44 +0xf2
created by github.com/containerd/containerd/cmd/containerd/command.handleSignals
        /tmp/tmp.0JSku0IZFM/src/github.com/containerd/containerd/cmd/containerd/command/main_unix.go:41 +0x8b

goroutine 11 [select]:
github.com/containerd/containerd/vendor/github.com/docker/go-events.(*Broadcaster).run(0xc00003c0f0)
        /tmp/tmp.0JSku0IZFM/src/github.com/containerd/containerd/vendor/github.com/docker/go-events/broadcast.go:117 +0x1b3
created by github.com/containerd/containerd/vendor/github.com/docker/go-events.NewBroadcaster
        /tmp/tmp.0JSku0IZFM/src/github.com/containerd/containerd/vendor/github.com/docker/go-events/broadcast.go:39 +0x1b0

goroutine 114 [runnable]:
os/exec.(*Cmd).Start.func2(0xc0002738c0)
        /usr/local/go/src/os/exec/exec.go:448 +0xc6
created by os/exec.(*Cmd).Start
        /usr/local/go/src/os/exec/exec.go:447 +0x6d2

goroutine 47 [select]:
github.com/containerd/containerd/gc/scheduler.(*gcScheduler).run(0xc0002408a0, 0x1bcd960, 0xc000040098)
        /tmp/tmp.0JSku0IZFM/src/github.com/containerd/containerd/gc/scheduler/scheduler.go:268 +0x1ce
created by github.com/containerd/containerd/gc/scheduler.init.0.func1
        /tmp/tmp.0JSku0IZFM/src/github.com/containerd/containerd/gc/scheduler/scheduler.go:132 +0x429

goroutine 115 [runnable]:
os/exec.(*Cmd).Wait(0xc0002738c0, 0x0, 0x0)
        /usr/local/go/src/os/exec/exec.go:514 +0x127
github.com/containerd/containerd/vendor/github.com/containerd/go-runc.(*defaultMonitor).Start.func1(0xc0002738c0, 0xc00035e4e0)
        /tmp/tmp.0JSku0IZFM/src/github.com/containerd/containerd/vendor/github.com/containerd/go-runc/monitor.go:55 +0x31
created by github.com/containerd/containerd/vendor/github.com/containerd/go-runc.(*defaultMonitor).Start
        /tmp/tmp.0JSku0IZFM/src/github.com/containerd/containerd/vendor/github.com/containerd/go-runc/monitor.go:53 +0xa7

上面只是偶尔的报错，偶尔也会报错 segment fault，同时根目录也有 coredump 生成：

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$ ll /
总用量 145912
lrwxrwxrwx.   1 root root         7 10月 13 2021 bin -> usr/bin
dr-xr-xr-x.   5 root root      4096 4月  11 14:55 boot
-rw-------    1 root root 230711296 4月  15 13:59 core.28650
-rw-------    1 root root 187424768 4月  15 13:46 core.3977
drwxr-xr-x   12 xxx  xxx        156 10月 29 11:32 data
drwxr-xr-x   19 root root      3180 4月  15 12:38 dev
drwxr-xr-x.  85 root root      8192 4月  15 12:44 etc
drwxr-xr-x.   3 root root        17 10月 28 13:30 home
lrwxrwxrwx.   1 root root         7 10月 13 2021 lib -> usr/lib
lrwxrwxrwx.   1 root root         9 10月 13 2021 lib64 -> usr/lib64
drwxr-xr-x.   3 root root       127 10月 28 13:32 media
drwxr-xr-x.   2 root root         6 4月  11 2018 mnt
drwxr-xr-x.   3 root root        24 10月 28 13:38 opt
dr-xr-xr-x  253 root root         0 4月  15 12:38 proc
dr-xr-x---.   7 root root       258 4月  15 13:13 root
drwxr-xr-x   30 root root       960 4月  15 14:11 run
lrwxrwxrwx.   1 root root         8 10月 13 2021 sbin -> usr/sbin
drwxr-xr-x.   2 root root         6 4月  11 2018 srv
dr-xr-xr-x   13 root root         0 4月  15 13:12 sys
drwxrwxrwt.  14 root root      4096 4月  15 14:28 tmp
drwxr-xr-x.  13 root root       155 10月 13 2021 usr
drwxr-xr-x.  19 root root       267 10月 13 2021 var

对比了二进制文件，也没损坏，查看了进程，也没有啥安全软件，查看下系统日志，其实在上面排查过程中 ssh 也会偶尔断开，然后 strace 也是没有啥头绪。

系统日志里过滤一些无用的信息后，发现 bash 也会 segfault：

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Apr 15 13:46:32 xxx supervisord: 2022-04-15 13:46:32,958 INFO exited: prometheus_00 (exit status 2; expected)
Apr 15 13:46:33 xxx supervisord: 2022-04-15 13:46:33,962 INFO spawned: 'prometheus_00' with pid 3751
Apr 15 13:46:35 xxx supervisord: 2022-04-15 13:46:35,379 INFO success: prometheus_00 entered RUNNING state, process has stayed up for > than 1 seconds (startsecs)
Apr 15 13:46:35 xxx dockerd: failed to start daemon: failed to dial "/run/containerd/containerd.sock": failed to dial "/run/containerd/containerd.sock": context deadline exceeded
Apr 15 13:46:35 xxx systemd: docker.service: main process exited, code=exited, status=1/FAILURE
Apr 15 13:46:35 xxx systemd: Unit docker.service entered failed state.
Apr 15 13:46:35 xxx systemd: docker.service failed.
Apr 15 13:46:40 xxx systemd: docker.service holdoff time over, scheduling restart.
Apr 15 13:46:40 xxx systemd: Starting Docker Application Container Engine...
Apr 15 13:46:40 xxx systemd: Started Docker Application Container Engine.
Apr 15 13:46:40 xxx systemd: docker.service: main process exited, code=killed, status=11/SEGV
Apr 15 13:46:40 xxx systemd: Unit docker.service entered failed state.
Apr 15 13:46:40 xxx systemd: docker.service failed.
Apr 15 13:46:42 xxx kernel: bash[4028]: segfault at fa8 ip 0000000000440c58 sp 00007fff8528e830 error 4 in bash[400000+de000]

单独看看 segfault：

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$ grep kernal /var/log/messages | grep -i segfault

Apr 15 11:17:31 xxx kernel: celery[13267]: segfault at 6de410 ip 000000000041b720 sp 00007ffccf1813c0 error 4 in python3.7[400000+293000]
Apr 15 11:20:35 xxx kernel: redis-server[21118]: segfault at 5dd030 ip 00000000005dd030 sp 00007ffc05cbe440 error 14 in redis-server[6dd000+1000]
Apr 15 11:20:35 xxx kernel: supervisord[20844]: segfault at 29 ip 000000000045c030 sp 00007ffd48aa29d0 error 4 in python3.7[400000+293000]
Apr 15 11:20:51 xxx kernel: gunicorn[23241]: segfault at 8 ip 00000000004272c8 sp 00007ffc0c4f34e0 error 4 in python3.7[400000+293000]
Apr 15 11:20:56 xxx kernel: celery[23193]: segfault at 10 ip 0000000000454a29 sp 00007ffd17acce78 error 4 in python3.7[400000+293000]
Apr 15 11:20:56 xxx kernel: python[23196]: segfault at 154c0ab0 ip 0000000000420eb0 sp 00007fff43b9fe08 error 6 in python3.7[400000+293000]
Apr 15 12:38:34 xxx kernel: init.ipv6-globa[1154]: segfault at 68 ip 000000000044f62f sp 00007ffc2cf307a8 error 6 in bash[400000+de000]
Apr 15 12:59:25 xxx kernel: bash[11112]: segfault at 18 ip 0000000000449dc9 sp 00007ffffbc2dac8 error 4 in bash[400000+de000]
Apr 15 13:00:58 xxx kernel: bash[14117]: segfault at ffffffff8d48ffff ip 0000000000440c36 sp 00007ffe9be29640 error 7 in bash[400000+de000]
Apr 15 13:01:19 xxx kernel: strace[14852]: segfault at 0 ip           (null) sp 00007ffc836a2be8 error 14 in strace[400000+f7000]
Apr 15 13:10:44 xxx kernel: grep[2587]: segfault at a0d ip 000000000040c43f sp 00007ffcda056be8 error 4 in grep[400000+25000]
Apr 15 13:14:06 xxx kernel: strace[9484]: segfault at ffffffff89489abc ip 00000000004336c2 sp 00007ffcb217a758 error 7 in strace[400000+f7000]
Apr 15 13:27:57 xxx kernel: grep[32713]: segfault at 0 ip           (null) sp 00007ffebf181d10 error 14 in grep[400000+25000]
Apr 15 13:30:22 xxx kernel: bash[5138]: segfault at 108 ip 000000000040cc32 sp 00007ffd55de2728 error 4 in bash[400000+de000]
Apr 15 13:35:56 xxx kernel: strace[15846]: segfault at 0 ip           (null) sp 00007ffef0a931e0 error 14 in strace[400000+f7000]
Apr 15 13:36:27 xxx kernel: bash[16818]: segfault at 33173b0 ip 000000000046d584 sp 00007ffdb71ff5c8 error 6 in bash[400000+de000]
Apr 15 13:37:04 xxx kernel: bash[17993]: segfault at 46a0 ip 0000000000440c58 sp 00007fffd76cf1e0 error 4 in bash[400000+de000]
Apr 15 13:39:49 xxx kernel: bash[23124]: segfault at 5aa0 ip 0000000000440c58 sp 00007fff98271ac0 error 4 in bash[400000+de000]
Apr 15 13:46:42 xxx kernel: bash[4028]: segfault at fa8 ip 0000000000440c58 sp 00007fff8528e830 error 4 in bash[400000+de000]
Apr 15 13:59:04 xxx kernel: redis_exporter-[21520]: segfault at 43b8ba ip 000000000043b892 sp 000000c000057f48 error 7 in redis_exporter-1.23.1.linux-x86_64[400000+41f000]
Apr 15 14:12:12 xxx kernel: grepconf.sh[20714]: segfault at 0 ip           (null) sp 00007ffe3009c158 error 14 in bash[400000+de000]
Apr 15 14:14:43 xxx kernel: bash[25463]: segfault at 313f4023 ip 00000000313f4023 sp 00007ffd25075948 error 14 in ISO8859-1.so[7f6335587000+2000]
Apr 15 14:22:32 xxx kernel: bash[7390]: segfault at 18 ip 0000000000449dc9 sp 00007ffc765d0558 error 4 in bash[400000+de000]
Apr 15 14:38:21 xxx kernel: prometheus[26806]: segfault at 440eb5 ip 0000000000421391 sp 000000c0002f1f38 error 7 in prometheus[400000+20ec000]
Apr 15 14:38:21 xxx kernel: prometheus[26801]: segfault at bffffffff8 ip 0000000000440ea3 sp 000000c000000000 error 6 in prometheus[400000+20ec000]

看了下内存容量也正常，很多东西都会触发 segmenft fault，但是最常见的就是内存越界，但是根据系统日志看并不存在内存越界（毕竟这么多进程都 segfault，不可能这么多进程代码写的有问题），使用 rpm -V glibc 也没看到 so 文件被修改，初步怀疑客户的宿主机内存有问题，让客户迁移下这台机器。

后续

2022/04/22 反馈迁移后一切都正常了。

coredump 的配置参考

参考文章 coredump配置、产生、分析以及分析示例 coredump 的一些配置

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$ cat /proc/sys/kernel/core_pattern 
core

临时修改

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echo "core-%e-%p-%t-%s" > /proc/sys/kernel/core_pattern

参数说明：

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%% - 单个%字符
%p - 添加pid
%u - 添加当前uid
%g - 添加当前gid
%s - 添加导致产生core的信号
%t - 添加core文件生成时的unix时间
%h - 添加主机名
%e - 添加程序文件名

sysctl 固化

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kernel.core_pattern=core-%e-%p-%t-%s
kernel.core_uses_pid=1

limit.d/*.conf 配置 coredump 文件限制

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* soft core 1024

原文作者：Zhangguanzhang

原文链接：http://zhangguanzhang.github.io/2022/04/22/segfault-often/

发表日期：April 22nd 2022, 10:15:30 am

更新日期：April 22nd 2022, 10:15:30 am

版权声明：本文采用知识共享署名-非商业性使用 4.0 国际许可协议进行许可

CATALOG
  1. 1. 由来
  2. 2. 处理过程
  3. 3. 后续
  4. 4. coredump 的配置参考
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