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Re: [libvirt-users] libvirt crashes with Caught Segmentation violation



Hi,
Thank you Michal for your advice.
I went ahead and used gdb, and this is the result I got:
2014-02-14 00:54:11.109+0000: 34958: info : remoteDispatchAuthList:2091 : Bypass polkit auth for privileged client pid:58466,uid:0
2014-02-14 00:54:11.125+0000: 34958: error : qemudDomainInterfaceStats:7865 : 無効な引数: 無効なパス、'Interface' は不明なインターフェイスです
2014-02-14 00:54:11.155+0000: 34960: info : remoteDispatchAuthList:2091 : Bypass polkit auth for privileged client pid:58474,uid:0
2014-02-14 00:54:11.218+0000: 34967: info : remoteDispatchAuthList:2091 : Bypass polkit auth for privileged client pid:58489,uid:0
2014-02-14 00:54:11.282+0000: 34961: info : remoteDispatchAuthList:2091 : Bypass polkit auth for privileged client pid:58506,uid:0
2014-02-14 00:54:11.392+0000: 34967: info : remoteDispatchAuthList:2091 : Bypass polkit auth for privileged client pid:58514,uid:0
2014-02-14 00:54:11.408+0000: 34967: error : qemudDomainInterfaceStats:7865 : 無効な引数: 無効なパス、'Interface' は不明なインターフェイスです
2014-02-14 00:54:11.438+0000: 34960: info : remoteDispatchAuthList:2091 : Bypass polkit auth for privileged client pid:58522,uid:0
2014-02-14 00:54:11.502+0000: 34959: info : remoteDispatchAuthList:2091 : Bypass polkit auth for privileged client pid:58536,uid:0
2014-02-14 00:54:11.612+0000: 34961: info : remoteDispatchAuthList:2091 : Bypass polkit auth for privileged client pid:58573,uid:0
2014-02-14 00:54:11.707+0000: 34960: info : remoteDispatchAuthList:2091 : Bypass polkit auth for privileged client pid:58600,uid:0
2014-02-14 00:54:12.007+0000: 34962: info : remoteDispatchAuthList:2091 : Bypass polkit auth for privileged client pid:58642,uid:0
2014-02-14 00:54:12.072+0000: 34958: info : remoteDispatchAuthList:2091 : Bypass polkit auth for privileged client pid:58653,uid:0
2014-02-14 00:54:12.197+0000: 34960: info : remoteDispatchAuthList:2091 : Bypass polkit auth for privileged client pid:58666,uid:0
2014-02-14 00:54:12.264+0000: 34966: info : remoteDispatchAuthList:2091 : Bypass polkit auth for privileged client pid:58678,uid:0
2014-02-14 00:54:12.355+0000: 34967: info : remoteDispatchAuthList:2091 : Bypass polkit auth for privileged client pid:58685,uid:0
2014-02-14 00:54:12.508+0000: 34964: info : remoteDispatchAuthList:2091 : Bypass polkit auth for privileged client pid:58693,uid:0
2014-02-14 00:54:12.677+0000: 34961: info : remoteDispatchAuthList:2091 : Bypass polkit auth for privileged client pid:58707,uid:0
2014-02-14 00:54:12.744+0000: 34960: info : remoteDispatchAuthList:2091 : Bypass polkit auth for privileged client pid:58719,uid:0
2014-02-14 00:54:12.843+0000: 34965: info : remoteDispatchAuthList:2091 : Bypass polkit auth for privileged client pid:58726,uid:0

Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 0x7f77cd80d700 (LWP 34958)]
0x00007f77d81b696c in free () from /lib64/libc.so.6
Here's the result of the backtrace:
(gdb) backtrace
#0  0x00007f77d81b696c in free () from /lib64/libc.so.6
#1  0x00007f77db790159 in virFree (ptrptr=0x7f77a0020088) at util/memory.c:310
#2  0x00007f77db7a1072 in virTypedParameterArrayClear (params=<value optimized out>,
    nparams=5) at util/virtypedparam.c:58
#3  0x0000000000425bec in remoteDispatchDomainBlockStatsFlags (
    server=<value optimized out>, client=<value optimized out>,
    msg=<value optimized out>, rerr=0x7f77cd80cbc0, args=<value optimized out>,
    ret=0x7f77a0021730) at remote.c:1186
#4  remoteDispatchDomainBlockStatsFlagsHelper (server=<value optimized out>,
    client=<value optimized out>, msg=<value optimized out>, rerr=0x7f77cd80cbc0,
    args=<value optimized out>, ret=0x7f77a0021730) at remote_dispatch.h:757
#5  0x00007f77db856e65 in virNetServerProgramDispatchCall (prog=0xf1f220,
    server=0xf13ce0, client=0xf1b570, msg=0xf1f3d0) at rpc/virnetserverprogram.c:416
#6  virNetServerProgramDispatch (prog=0xf1f220, server=0xf13ce0, client=0xf1b570,
    msg=0xf1f3d0) at rpc/virnetserverprogram.c:289
#7  0x00007f77db8580f1 in virNetServerHandleJob (jobOpaque=<value optimized out>,
    opaque=0xf13ce0) at rpc/virnetserver.c:164
#8  0x00007f77db79a45c in virThreadPoolWorker (opaque=<value optimized out>)
    at util/threadpool.c:144
#9  0x00007f77db799d79 in virThreadHelper (data="" optimized out>)
    at util/threads-pthread.c:161
#10 0x00007f77d88dc851 in start_thread () from /lib64/libpthread.so.0
#11 0x00007f77d822367d in clone () from /lib64/libc.so.6
And util/virtypedparam.c:58 looks like this for libvirt-0.9.10:
 49 virTypedParameterArrayClear(virTypedParameterPtr params, int nparams)
 50 {
 51     int i;
 52
 53     if (!params)
 54         return;
 55
 56     for (i = 0; i < nparams; i++) {
 57         if (params[i].type == VIR_TYPED_PARAM_STRING)
 58             VIR_FREE(params[i].value.s);
 59     }
 60 }
 61

I'm very unfamiliar with C so I would again appreciate any input on why this is happening, and what I can do to solve this issue.
By the way this segfault can be 100% reproduced with CentOS 6.3 but not CentOS 6.2.

Thank you and regards,
Minami

On 2014/02/07 18:30, Michal Privoznik wrote:
On 07.02.2014 09:47, Minami Katsumata wrote:
Hi,

I'm having problems with libvirt crashing after a couple hours when a
specific domain monitoring program is running.

I have pasted below the following:
1. libvirt version
2. qemu-kvm version
3. OS version
4. Kernel version
5. libvirt status post-crash
6. libvirtd.log (info level dump around crash; too long to post
everything so just the beginning and end. UTC)
7. custom.log (on what this domain monitoring program was doing around
the time of the crash. JST)
8. FYI on the program being executed
9. other related server settings

Please, if anyone can look through these and give some insight as to
what is causing libvirt to crash, that would be greatly appreciated.

1.) libvirt version:
# rpm -q libvirt
libvirt-0.9.10-21.el6.x86_64

This is rather ancient libvirt, can you please update and see if the issue was fixed?


2.) qemu-kvm version:
qemu-kvm-0.12.1.2-3.295.el6.10.x86_64

3.) OS version:
# cat /etc/redhat-release
CentOS release 6.3 (Final)

Ah, this explains the libvirt version. AFAIK there's been Centos-6.5 released.


4.) Kernel version:
# uname -r
2.6.32-279.22.1.el6.x86_64

5.) libvirt status after crash:
# service libvirtd status
libvirtd dead but pid file exists

6.) libvirtd.log

2014-02-06 10:25:05.173+0000: 1187: info : remoteDispatchAuthList:2091 : Bypass polkit auth for privileged client pid:58626,uid:0
2014-02-06 10:25:05.237+0000: 1184: info : remoteDispatchAuthList:2091 : Bypass polkit auth for privileged client pid:58636,uid:0
2014-02-06 10:25:05.271+0000: 1185: info : remoteDispatchAuthList:2091 : Bypass polkit auth for privileged client pid:58646,uid:0
2014-02-06 10:25:05.301+0000: 1184: info : remoteDispatchAuthList:2091 : Bypass polkit auth for privileged client pid:58648,uid:0
2014-02-06 10:25:05.400+0000: 1184: info : remoteDispatchAuthList:2091 : Bypass polkit auth for privileged client pid:58650,uid:0
Caught Segmentation violation dumping internal log buffer:

     ====== start of log =====

^ 05 412+00001182: debug : virEventPollMakePollFDs:383 : Prepare n=19 w=21, f=32 e=25 d=0
2014-02-06 10:25:05.412+00001182: debug : virEventPollMakePollFDs:383 : Prepare n=20 w=22, f=34 e=25 d=0
2014-02-06 10:25:05.412+00001182: debug : virEventPollMakePollFDs:383 : Prepare n=21 w=23, f=33 e=25 d=0
2014-02-06 10:25:05.412+00001182: debug : virEventPollMakePollFDs:383 : Prepare n=22 w=24, f=36 e=25 d=0
2014-02-06 10:25:05.412+00001182: debug : virEventPollMakePollFDs:383 : Prepare n=23 w=25, f=38 e=25 d=0
2014-02-06 10:25:05.412+00001182: debug : virEventPollMakePollFDs:383 : Prepare n=24 w=26, f=39 e=25 d=0
2014-02-06 10:25:05.412+00001182: debug : virEventPollMakePollFDs:383 : Prepare n=25 w=27, f=41 e=25 d=0
2014-02-06 10:25:05.412+00001182: debug : virEventPollMakePollFDs:383 : Prepare n=26 w=28, f=40 e=25 d=0

(cut out due to length)

2014-02-06 10:25:05.423+00001182: debug : virEventPollDispatchHandles:488 : EVENT_POLL_DISPATCH_HANDLE: watch=2791 events=2
2014-02-06 10:25:05.423+00001182: debug : virNetMessageFree:75 : msg=0x2326a20 nfds=0 cb=(nil)
2014-02-06 10:25:05.423+00001182: debug : virNetServerClientCalculateHandleMode:137 : tls=(nil) hs=-1, rx=0x2266390 tx=(nil)
2014-02-06 10:25:05.423+00001182: debug : virNetServerClientCalculateHandleMode:167 : mode=1
2014-02-06 10:25:05.423+00001182: debug : virEventPollUpdateHandle:151 : EVENT_POLL_UPDATE_HANDLE: watch=2791 events=1
2014-02-06 10:25:05.423+00001182: debug : virEventPollInterruptLocked:702 : Skip interrupt, 1 -1675536288
2014-02-06 10:25:05.423+00001182: debug : virEventPollDispatchHandles:474 : i=33 w=2793
2014-02-06 10:25:05.423+00001182: debug : virEventPollCleanupTimeouts:506 : Cleanup 12
2014-02-06 10:25:05.423+00001182: debug : virEventPollCleanupHandles:554 : Cleanup 34
2014-02-06 10:25:05.423+00001182: debug : virNetServerClientClose:632 : client=0x22e6860 refs=3
2014-02-06 10:25:05.423+00001182: debug : virKeepAliveStop:382 : RPC_KEEPALIVE_STOP: ka=0x225bf20 client=0x22e6860
2014-02-06 10:25:05.423+00001182: debug : virEventPollRemoveTimeout:293 : EVENT_POLL_REMOVE_TIMEOUT: timer=8290
2014-02-06 10:25:05.423+00001182: debug : virEventPollInterruptLocked:702 : Skip interrupt, 0 -1675536288
2014-02-06 10:25:05.423+00001182: debug : virEventPollRemoveTimeout:293 : EVENT_POLL_REMOVE_TIMEOUT: timer=8289
2014-02-06 10:25:05.423+00001182: debug : virEventPollInterruptLocked:702 : Skip interrupt, 0 -1675536288
2014-02-06 10:25:05.423+00001182: debug : virKeepAliveFree:304 : RPC_KEEPALIVE_FREE: ka=0x225bf20 client=0x22e6860 refs=3
2014-02-06 10:25:05.423+00001182: debug : daemonRemoveAllClientStreams:493 : stream=(nil)
2014-02-06 10:25:05.423+00001182: debug : virEventPollRemoveHandle:180 : EVENT_POLL_REMOVE_HANDLE: watch=2791
2014-02-06 10:25:05.423+00001182: debug : virEventPollRemoveHandle:193 : mark delete 32 50
2014-02-06 10:25:05.423+00001182: debug : virEventPollInterruptLocked:702 : Skip interrupt, 0 -1675536288
2014-02-06 10:25:05.423+00001182: debug : virNetMessageFree:75 : msg=0x2266390 nfds=0 cb=(nil)
2014-02-06 10:25:05.423+00001182: debug : virNetSocketFree:722 : RPC_SOCKET_FREE: sock=0x22e66a0 refs=2
2014-02-06 10:25:05.423+00001182: debug : virNetServerClientFree:591 : RPC_SERVER_CLIENT_FREE: client=0x22e6860 refs=3
2014-02-06 10:25:05.423+00001182: debug : virEventRunDefaultImpl:244 : running default event implementation
2014-02-06 10:25:05.423+00001182: debug : virEventPollCleanupTimeouts:506 : Cleanup 12
2014-02-06 10:25:05.423+00001182: debug : virEventPollCleanupTimeouts:519 : EVENT_POLL_PURGE_TIMEOUT: timer=8289
2014-02-06 10:25:05.423+00001182: debug : virKeepAliveFree:304 : RPC_KEEPALIVE_FREE: ka=0x225bf20 client=0x22e6860 refs=2
2014-02-06 10:25:05.423+00001182: debug : virEventPollCleanupTimeouts:519 : EVENT_POLL_PURGE_TIMEOUT: timer=8290
2014-02-06 10:25:05.423+00001182: debug : virKeepAliveFree:304 : RPC_KEEPALIVE_FREE: ka=0x225bf20 client=0x22e6860 refs=1
2014-02-06 10:25:05.423+00001182: debug : virNetServerClientFree:591 : RPC_SERVER_CLIENT_FREE: client=0x22e6860 refs=2
2014-02-06 10:25:05.423+00001182: debug : virEventPollCleanupHandles:554 : Cleanup 34
2014-02-06 10:25:05.423+00001182: debug : virEventPollCleanupHandles:567 : EVENT_POLL_PURGE_HANDLE: watch=2791
2014-02-06 10:25:05.423+00001182: debug : virNetServerClientFree:591 : RPC_SERVER_CLIENT_FREE: client=0x22e6860 refs=1
2014-02-06 10:25:05.423+00001182: debug : virConnectClose:1462 : conn=0x7f1b380c4630
2014-02-06 10:25:05.423+00001182: debug : virUnrefConnect:145 : unref connection 0x7f1b380c4630 1
2014-02-06 10:25:05.423+00001182: debug : virReleaseConnect:94 : release connection 0x7f1b380c4630

      ====== end of log =====

These logs are pretty much useless (not your fault). On one hand, they may help us to see what libvirt was doing just before the crash. On the other hand:
a) it completely misses TID
b) it ends just before SIGSEGV occurs (so for example if segmentation fault happens in one thread, the logs may as well been showing completely unrelated thread).

Therefore I think attaching gdb to the libvirtd, then reproducing the crash would gain more data, IMO.

Michal


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