[libvirt-users] About debugging of libvirt.
cool dharma06
cooldharma06 at gmail.com
Thu Dec 19 10:12:52 UTC 2013
i did the debugging as you said. Kindly refer the following logs:
(gdb) c
Continuing.
thread apply all bt
[New Thread 0x7fc337c6b700 (LWP 29520)]
Program received signal SIGSEGV, Segmentation fault.
0x0000000000000000 in ?? ()
(gdb) thread apply all bt
Thread 12 (Thread 0x7fc337c6b700 (LWP 29520)):
#0 0x00007fc33509f18d in read () from /lib/x86_64-linux-gnu/libpthread.so.0
#1 0x00007fc32b1555c4 in read_all (fd=26, data=0x7fc3380e0a70,
data at entry=0x20,
len=len at entry=16, nonblocking=nonblocking at entry=0) at xs.c:365
#2 0x00007fc32b1556d8 in read_message (h=h at entry=0x7fc324013ee0,
nonblocking=nonblocking at entry=0) at xs.c:1071
#3 0x00007fc32b156005 in read_thread (arg=0x7fc324013ee0) at xs.c:1137
#4 0x00007fc335097b50 in start_thread () from
/lib/x86_64-linux-gnu/libpthread.so.0
#5 0x00007fc3349daa3d in clone () from /lib/x86_64-linux-gnu/libc.so.6
#6 0x0000000000000000 in ?? ()
Thread 11 (Thread 0x7fc330e7f700 (LWP 29170)):
#0 0x00007fc33509c2d4 in pthread_cond_wait@@GLIBC_2.3.2 () from
/lib/x86_64-linux-gnu/libpthread.so.0
#1 0x00007fc3371ae9ea in virCondWait (c=c at entry=0x7fc3380dbd80,
m=m at entry=0x7fc3380dbd58)
at util/virthreadpthread.c:117
#2 0x00007fc3371af0cb in virThreadPoolWorker
(opaque=opaque at entry=0x7fc3380db870)
at util/virthreadpool.c:103
#3 0x00007fc3371ae686 in virThreadHelper (data=<optimized out>) at
util/virthreadpthread.c:161
#4 0x00007fc335097b50 in start_thread () from
/lib/x86_64-linux-gnu/libpthread.so.0
#5 0x00007fc3349daa3d in clone () from /lib/x86_64-linux-gnu/libc.so.6
#6 0x0000000000000000 in ?? ()
Thread 10 (Thread 0x7fc33067e700 (LWP 29171)):
#0 0x00007fc33509c2d4 in pthread_cond_wait@@GLIBC_2.3.2 () from
/lib/x86_64-linux-gnu/libpthread.so.0
#1 0x00007fc3371ae9ea in virCondWait (c=c at entry=0x7fc3380dbd80,
m=m at entry=0x7fc3380dbd58)
at util/virthreadpthread.c:117
#2 0x00007fc3371af0cb in virThreadPoolWorker
(opaque=opaque at entry=0x7fc3380db640)
at util/virthreadpool.c:103
#3 0x00007fc3371ae686 in virThreadHelper (data=<optimized out>) at
util/virthreadpthread.c:161
#4 0x00007fc335097b50 in start_thread () from
/lib/x86_64-linux-gnu/libpthread.so.0
#5 0x00007fc3349daa3d in clone () from /lib/x86_64-linux-gnu/libc.so.6
#6 0x0000000000000000 in ?? ()
Thread 9 (Thread 0x7fc32fe7d700 (LWP 29172)):
#0 0x00007fc33509c2d4 in pthread_cond_wait@@GLIBC_2.3.2 () from
/lib/x86_64-linux-gnu/libpthread.so.0
#1 0x00007fc3371ae9ea in virCondWait (c=c at entry=0x7fc3380dbd80,
m=m at entry=0x7fc3380dbd58)
at util/virthreadpthread.c:117
#2 0x00007fc3371af0cb in virThreadPoolWorker
(opaque=opaque at entry=0x7fc3380db870)
at util/virthreadpool.c:103
#3 0x00007fc3371ae686 in virThreadHelper (data=<optimized out>) at
util/virthreadpthread.c:161
#4 0x00007fc335097b50 in start_thread () from
/lib/x86_64-linux-gnu/libpthread.so.0
#5 0x00007fc3349daa3d in clone () from /lib/x86_64-linux-gnu/libc.so.6
#6 0x0000000000000000 in ?? ()
Thread 8 (Thread 0x7fc32f67c700 (LWP 29173)):
#0 0x00007fc33497cb9f in realloc () from /lib/x86_64-linux-gnu/libc.so.6
#1 0x00007fc3349eec85 in __vasprintf_chk () from
/lib/x86_64-linux-gnu/libc.so.6
---Type <return> to continue, or q <return> to quit---
#2 0x00007fc3371aac0a in vasprintf (__ap=0x7fc32f67b6d0,
__fmt=0x7fc337391017 "%llu: %s : %s:%d : %s\n", __ptr=0x7fc32f67b830)
at /usr/include/x86_64-linux-gnu/bits/stdio2.h:199
#3 virVasprintfInternal (report=report at entry=false, domcode=0,
filename=0x0, funcname=0x0, linenr=0, strp=0x7fc32f67b830,
fmt=fmt at entry=0x7fc337391017 "%llu: %s : %s:%d : %s\n",
list=list at entry=0x7fc32f67b6d0)
at util/virstring.c:337
#4 0x00007fc3371aad1b in virAsprintfInternal (report=report at entry=false,
domcode=domcode at entry=0, filename=filename at entry=0x0,
funcname=funcname at entry=0x0,
linenr=linenr at entry=0, strp=strp at entry=0x7fc32f67b830,
fmt=fmt at entry=0x7fc337391017
"%llu: %s : %s:%d : %s\n") at util/virstring.c:358
#5 0x00007fc33718cb59 in virLogFormatString (str=<optimized out>,
priority=VIR_LOG_DEBUG, funcname=0x7fc337394734 "virObjectRef", linenr=293,
msg=0x7fc32f67b830)
at util/virlog.c:719
#6 virLogVMessage (source=VIR_LOG_FROM_TRACE, priority=VIR_LOG_DEBUG,
filename=0x7fc337394597 "util/virobject.c", linenr=293,
funcname=0x7fc337394734 "virObjectRef",
metadata=0x0, fmt=fmt at entry=0x7fc3373945f1 "OBJECT_REF: obj=%p",
vargs=vargs at entry=0x7fc32f67b8c0) at util/virlog.c:846
#7 0x00007fc33718cfc7 in virLogMessage
(source=source at entry=VIR_LOG_FROM_TRACE,
priority=priority at entry=VIR_LOG_DEBUG,
filename=filename at entry=0x7fc337394597 "util/virobject.c",
linenr=linenr at entry=293, funcname=funcname at entry=0x7fc337394734
"virObjectRef",
metadata=metadata at entry=0x0, fmt=fmt at entry=0x7fc3373945f1 "OBJECT_REF:
obj=%p") at util/virlog.c:778
#8 0x00007fc33719c3d7 in virObjectRef (anyobj=0x7fc338102720) at
util/virobject.c:293
#9 0x00007fc32af1824f in libxlDriverConfigGet
(driver=driver at entry=0x7fc338108930)
at libxl/libxl_conf.c:1124
#10 0x00007fc32af1a50e in libxlVmCleanup (driver=driver at entry=0x7fc338108930,
vm=vm at entry=0x7fc32400f530, reason=reason at entry
=VIR_DOMAIN_SHUTOFF_DESTROYED)
at libxl/libxl_driver.c:264
#11 0x00007fc32af20274 in libxlVmReap (driver=0x7fc338108930,
vm=0x7fc32400f530, reason=VIR_DOMAIN_SHUTOFF_DESTROYED) at
libxl/libxl_driver.c:338
#12 0x00007fc32af207de in libxlDomainDestroyFlags (dom=0x7fc3380e3770,
flags=<optimized out>) at libxl/libxl_driver.c:1507
#13 0x00007fc33723cd37 in virDomainDestroy (domain=domain at entry=0x7fc3380e3770)
at libvirt.c:2342
#14 0x00007fc337cb9ba4 in remoteDispatchDomainDestroy (args=<optimized
out>, rerr=0x7fc32f67bcd0, client=0x7fc32400ee60, server=<optimized out>,
msg=<optimized out>)
at remote_dispatch.h:3165
#15 remoteDispatchDomainDestroyHelper (server=<optimized out>,
client=0x7fc32400ee60, msg=<optimized out>, rerr=0x7fc32f67bcd0,
args=<optimized out>,
ret=<optimized out>) at remote_dispatch.h:3143
#16 0x00007fc3372b4d79 in virNetServerProgramDispatchCall
(msg=0x7fc324014070, client=0x7fc32400ee60, server=0x7fc3380dbba0,
prog=0x7fc324007750)
at rpc/virnetserverprogram.c:435
#17 virNetServerProgramDispatch (prog=0x7fc324007750,
server=server at entry=0x7fc3380dbba0,
client=0x7fc32400ee60, msg=0x7fc324014070) at rpc/virnetserverprogram.c:305
#18 0x00007fc3372aea78 in virNetServerProcessMsg (msg=<optimized out>,
prog=<optimized out>, client=<optimized out>, srv=0x7fc3380dbba0) at
rpc/virnetserver.c:165
#19 virNetServerHandleJob (jobOpaque=<optimized out>,
opaque=0x7fc3380dbba0) at rpc/virnetserver.c:186
#20 0x00007fc3371af02e in virThreadPoolWorker
(opaque=opaque at entry=0x7fc3380db640)
at util/virthreadpool.c:144
#21 0x00007fc3371ae686 in virThreadHelper (data=<optimized out>) at
util/virthreadpthread.c:161
#22 0x00007fc335097b50 in start_thread () from
/lib/x86_64-linux-gnu/libpthread.so.0
#23 0x00007fc3349daa3d in clone () from /lib/x86_64-linux-gnu/libc.so.6
#24 0x0000000000000000 in ?? ()
Thread 7 (Thread 0x7fc32ee7b700 (LWP 29174)):
#0 0x00007fc33509c2d4 in pthread_cond_wait@@GLIBC_2.3.2 () from
/lib/x86_64-linux-gnu/libpthread.so.0
#1 0x00007fc3371ae9ea in virCondWait (c=c at entry=0x7fc3380dbd80,
m=m at entry=0x7fc3380dbd58)
at util/virthreadpthread.c:117
#2 0x00007fc3371af0cb in virThreadPoolWorker
(opaque=opaque at entry=0x7fc3380db870)
at util/virthreadpool.c:103
#3 0x00007fc3371ae686 in virThreadHelper (data=<optimized out>) at
util/virthreadpthread.c:161
---Type <return> to continue, or q <return> to quit---
#4 0x00007fc335097b50 in start_thread () from
/lib/x86_64-linux-gnu/libpthread.so.0
#5 0x00007fc3349daa3d in clone () from /lib/x86_64-linux-gnu/libc.so.6
#6 0x0000000000000000 in ?? ()
Thread 6 (Thread 0x7fc32e67a700 (LWP 29175)):
#0 0x00007fc33509c2d4 in pthread_cond_wait@@GLIBC_2.3.2 () from
/lib/x86_64-linux-gnu/libpthread.so.0
#1 0x00007fc3371ae9ea in virCondWait (c=c at entry=0x7fc3380dbe18,
m=m at entry=0x7fc3380dbd58)
at util/virthreadpthread.c:117
#2 0x00007fc3371af0eb in virThreadPoolWorker
(opaque=opaque at entry=0x7fc3380db640)
at util/virthreadpool.c:103
#3 0x00007fc3371ae686 in virThreadHelper (data=<optimized out>) at
util/virthreadpthread.c:161
#4 0x00007fc335097b50 in start_thread () from
/lib/x86_64-linux-gnu/libpthread.so.0
#5 0x00007fc3349daa3d in clone () from /lib/x86_64-linux-gnu/libc.so.6
#6 0x0000000000000000 in ?? ()
Thread 5 (Thread 0x7fc32de79700 (LWP 29176)):
#0 0x00007fc33509c2d4 in pthread_cond_wait@@GLIBC_2.3.2 () from
/lib/x86_64-linux-gnu/libpthread.so.0
#1 0x00007fc3371ae9ea in virCondWait (c=c at entry=0x7fc3380dbe18,
m=m at entry=0x7fc3380dbd58)
at util/virthreadpthread.c:117
#2 0x00007fc3371af0eb in virThreadPoolWorker
(opaque=opaque at entry=0x7fc3380db870)
at util/virthreadpool.c:103
#3 0x00007fc3371ae686 in virThreadHelper (data=<optimized out>) at
util/virthreadpthread.c:161
#4 0x00007fc335097b50 in start_thread () from
/lib/x86_64-linux-gnu/libpthread.so.0
#5 0x00007fc3349daa3d in clone () from /lib/x86_64-linux-gnu/libc.so.6
#6 0x0000000000000000 in ?? ()
Thread 4 (Thread 0x7fc32d678700 (LWP 29177)):
#0 0x00007fc33509c2d4 in pthread_cond_wait@@GLIBC_2.3.2 () from
/lib/x86_64-linux-gnu/libpthread.so.0
#1 0x00007fc3371ae9ea in virCondWait (c=c at entry=0x7fc3380dbe18,
m=m at entry=0x7fc3380dbd58)
at util/virthreadpthread.c:117
#2 0x00007fc3371af0eb in virThreadPoolWorker
(opaque=opaque at entry=0x7fc3380db640)
at util/virthreadpool.c:103
#3 0x00007fc3371ae686 in virThreadHelper (data=<optimized out>) at
util/virthreadpthread.c:161
#4 0x00007fc335097b50 in start_thread () from
/lib/x86_64-linux-gnu/libpthread.so.0
#5 0x00007fc3349daa3d in clone () from /lib/x86_64-linux-gnu/libc.so.6
#6 0x0000000000000000 in ?? ()
Thread 3 (Thread 0x7fc32ce77700 (LWP 29178)):
#0 0x00007fc33509c2d4 in pthread_cond_wait@@GLIBC_2.3.2 () from
/lib/x86_64-linux-gnu/libpthread.so.0
#1 0x00007fc3371ae9ea in virCondWait (c=c at entry=0x7fc3380dbe18,
m=m at entry=0x7fc3380dbd58)
at util/virthreadpthread.c:117
#2 0x00007fc3371af0eb in virThreadPoolWorker
(opaque=opaque at entry=0x7fc3380db870)
at util/virthreadpool.c:103
#3 0x00007fc3371ae686 in virThreadHelper (data=<optimized out>) at
util/virthreadpthread.c:161
#4 0x00007fc335097b50 in start_thread () from
/lib/x86_64-linux-gnu/libpthread.so.0
#5 0x00007fc3349daa3d in clone () from /lib/x86_64-linux-gnu/libc.so.6
#6 0x0000000000000000 in ?? ()
---Type <return> to continue, or q <return> to quit---
Thread 2 (Thread 0x7fc32c676700 (LWP 29179)):
#0 0x00007fc33509c2d4 in pthread_cond_wait@@GLIBC_2.3.2 () from
/lib/x86_64-linux-gnu/libpthread.so.0
#1 0x00007fc3371ae9ea in virCondWait (c=c at entry=0x7fc3380dbe18,
m=m at entry=0x7fc3380dbd58)
at util/virthreadpthread.c:117
#2 0x00007fc3371af0eb in virThreadPoolWorker
(opaque=opaque at entry=0x7fc3380db640)
at util/virthreadpool.c:103
#3 0x00007fc3371ae686 in virThreadHelper (data=<optimized out>) at
util/virthreadpthread.c:161
#4 0x00007fc335097b50 in start_thread () from
/lib/x86_64-linux-gnu/libpthread.so.0
#5 0x00007fc3349daa3d in clone () from /lib/x86_64-linux-gnu/libc.so.6
#6 0x0000000000000000 in ?? ()
Thread 1 (Thread 0x7fc337c4d7c0 (LWP 29169)):
#0 0x0000000000000000 in ?? ()
#1 0x00007fc32ace881e in libxl_osevent_occurred_timeout (ctx=<optimized
out>, for_libxl=0x7fc3380edf38) at libxl_event.c:1039
#2 0x00007fc32af199c7 in libxlDomainObjTimerCallback (timer=<optimized
out>, timer_info=0x7fc3380e3310) at libxl/libxl_domain.c:216
#3 0x00007fc33717cf7d in virEventPollDispatchTimeouts () at
util/vireventpoll.c:451
#4 virEventPollRunOnce () at util/vireventpoll.c:644
#5 0x00007fc33717b70b in virEventRunDefaultImpl () at util/virevent.c:274
#6 0x00007fc3372b0065 in virNetServerRun (srv=0x7fc3380dbba0) at
rpc/virnetserver.c:1112
#7 0x00007fc337c9851c in main (argc=<optimized out>, argv=<optimized out>)
at libvirtd.c:1513
(gdb)
(gdb)
****
regards,
cooldharma06.
On Thu, Dec 19, 2013 at 3:30 PM, Daniel P. Berrange <berrange at redhat.com>wrote:
> On Thu, Dec 19, 2013 at 03:09:14PM +0530, cool dharma06 wrote:
> > I am newbie to this gdb debugging. now i did the bt in the debugging. In
> my
> > side still it showing the error. Following are the stacktrace which i
> got.
> > Kindly refer the following logs for full information:
> >
> > ****
> > [New Thread 0x7f8503695700 (LWP 20012)]
> >
> > Program received signal SIGSEGV, Segmentation fault.
> > 0x0000000000000000 in ?? ()
> > (gdb) bt
> > #0 0x0000000000000000 in ?? ()
> > #1 0x00007f84f671281e in libxl_osevent_occurred_timeout (ctx=<optimized
> > out>, for_libxl=0x7f8503bbbc38) at libxl_event.c:1039
> > #2 0x00007f84f69439c7 in libxlDomainObjTimerCallback (timer=<optimized
> > out>, timer_info=0x7f8503bb5930) at libxl/libxl_domain.c:216
> > #3 0x00007f8502ba6f7d in virEventPollDispatchTimeouts () at
> > util/vireventpoll.c:451
> > #4 virEventPollRunOnce () at util/vireventpoll.c:644
> > #5 0x00007f8502ba570b in virEventRunDefaultImpl () at
> util/virevent.c:274
> > #6 0x00007f8502cda065 in virNetServerRun (srv=0x7f8503ba6ba0) at
> > rpc/virnetserver.c:1112
> > #7 0x00007f85036c251c in main (argc=<optimized out>, argv=<optimized
> out>)
> > at libvirtd.c:1513
> > (gdb)
>
> In this case, that stack trace looks like it ought to be sufficient
> to identify the problem - a clear NULL pointer reference. In general
> though you want to capture a stack trace of all threads in a program
>
> eg instead of 'bt', do 'thread apply all bt' next time.
>
> Regards,
> Daniel
> --
> |: http://berrange.com -o- http://www.flickr.com/photos/dberrange/:|
> |: http://libvirt.org -o- http://virt-manager.org:|
> |: http://autobuild.org -o- http://search.cpan.org/~danberr/:|
> |: http://entangle-photo.org -o- http://live.gnome.org/gtk-vnc:|
>
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