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[libvirt] libvirtd crash when attach-disk to VM



Hi all,
I got a depressed problem(libvirtd crash with SIGABRT or SIGSEGV sometimes) when attach a nbd disk to a VM by using cmd as follow:
virsh attach-disk 228 --source /dev/nbd0 --target vdd --sourcetype block --driver qemu --subdriver raw
or just using  virsh attach-disk 228 /dev/nbd0 vdd.
and this problem occurs everytime when I attach a nbd disk to VM.

the device nbd0 is create by qemu-nbd cmd: qemu-nbd -c /dev/nbd0 /home/hzwangpan/zero
root 114-113-199-15:/home/hzwangpan# qemu-nbd -V
qemu-nbd version 0.0.1
the 'zero' file was created by qemu-img cmd: qemu-img create -f raw zero 512M
qemu-img version 1.1.0, Copyright (c) 2004-2008 Fabrice Bellard

Some info of packages' version is listed below:
root 114-113-199-15:/home/hzwangpan# dpkg -l | grep libvi
ii  libvirt-bin                                    0.9.12-4                             programs for the libvirt library
ii  libvirt-dev                                    0.9.12-4                             development files for the libvirt library
ii  libvirt0                                       0.9.12-4                             library for interfacing with different virtualization systems
ii  libvirt0-dbg                                   0.9.12-4                             library for interfacing with different virtualization systems

root 114-113-199-15:/home/hzwangpan# virsh version
Compiled against library: libvir 0.9.12
Using library: libvir 0.9.12
Using API: QEMU 0.9.12
Running hypervisor: QEMU 1.1.0

root 114-113-199-15:/home/hzwangpan# kvm -version
QEMU emulator version 1.1.0 (qemu-kvm-1.1.0+dfsg-3, Debian), Copyright (c) 2003-2008 Fabrice Bellard

root 114-113-199-15:/home/hzwangpan# uname -a
Linux 114-113-199-15 3.2.0-3-amd64 #1 SMP Thu Jun 28 09:07:26 UTC 2012 x86_64 GNU/Linux

root 114-113-199-15:/home/hzwangpan# cat /etc/issue
Debian GNU/Linux wheezy/sid \n \l

the backtrace info when libvirtd crash is list here:
1) one situation:
*** glibc detected *** /usr/sbin/libvirtd: malloc(): memory corruption (fast): 0x000000000087bc10 ***
======= Backtrace: =========
/lib/x86_64-linux-gnu/libc.so.6(+0x75b46)[0x7ffff4608b46]
/lib/x86_64-linux-gnu/libc.so.6(+0x79428)[0x7ffff460c428]
/lib/x86_64-linux-gnu/libc.so.6(__libc_malloc+0x70)[0x7ffff460d960]
/lib/x86_64-linux-gnu/libc.so.6(__strdup+0x22)[0x7ffff4612912]
/usr/lib/libvirt.so.0(virJSONValueObjectAppend+0x39)[0x7ffff77b75c9]
/usr/lib/libvirt.so.0(virJSONValueObjectAppendString+0x37)[0x7ffff77b7e87]
/usr/sbin/libvirtd[0x4aa884]
/usr/sbin/libvirtd[0x4ac3a7]
/usr/sbin/libvirtd[0x49d303]
/usr/sbin/libvirtd[0x4a8bfe]
/usr/sbin/libvirtd[0x4b0814]
/usr/sbin/libvirtd[0x484a5d]
/usr/sbin/libvirtd[0x461d9e]
/usr/lib/libvirt.so.0(virDomainAttachDevice+0xdd)[0x7ffff7846f5d]
/usr/sbin/libvirtd[0x43ccfe]
/usr/lib/libvirt.so.0(+0x129866)[0x7ffff788a866]
/usr/lib/libvirt.so.0(+0x1254d1)[0x7ffff78864d1]
/usr/lib/libvirt.so.0(+0x6273e)[0x7ffff77c373e]
/usr/lib/libvirt.so.0(+0x621c9)[0x7ffff77c31c9]
/lib/x86_64-linux-gnu/libpthread.so.0(+0x6b50)[0x7ffff4d27b50]
/lib/x86_64-linux-gnu/libc.so.6(clone+0x6d)[0x7ffff466b6dd]
======= Memory map: ========
00400000-0053d000 r-xp 00000000 08:01 69457                              /usr/sbin/libvirtd
0073c000-0073e000 r--p 0013c000 08:01 69457                              /usr/sbin/libvirtd
0073e000-00746000 rw-p 0013e000 08:01 69457                              /usr/sbin/libvirtd
00746000-00aa1000 rw-p 00000000 00:00 0                                  [heap]
7fffe0000000-7fffe021f000 rw-p 00000000 00:00 0 
7fffe021f000-7fffe4000000 ---p 00000000 00:00 0 
7fffe77ff000-7fffe7800000 ---p 00000000 00:00 0 
7fffe7800000-7fffe8000000 rw-p 00000000 00:00 0 
7fffe8000000-7fffe8175000 rw-p 00000000 00:00 0 
7fffe8175000-7fffec000000 ---p 00000000 00:00 0 
7fffec138000-7fffec139000 ---p 00000000 00:00 0 
7fffec139000-7fffec939000 rw-p 00000000 00:00 0 
7fffec939000-7fffec96e000 r--s 00000000 08:06 286722                     /var/cache/nscd/passwd
7fffec96e000-7fffec99a000 rw-p 00000000 00:00 0 
7fffec99a000-7fffec99b000 ---p 00000000 00:00 0 
7fffec99b000-7fffed19b000 rw-p 00000000 00:00 0 
7fffed19b000-7fffed315000 r-xp 00000000 08:01 124989                     /usr/lib/x86_64-linux-gnu/libdb-5.1.so
7fffed315000-7fffed515000 ---p 0017a000 08:01 124989                     /usr/lib/x86_64-linux-gnu/libdb-5.1.so
7fffed515000-7fffed51b000 r--p 0017a000 08:01 124989                     /usr/lib/x86_64-linux-gnu/libdb-5.1.so
7fffed51b000-7fffed51e000 rw-p 00180000 08:01 124989                     /usr/lib/x86_64-linux-gnu/libdb-5.1.so
7fffed51e000-7fffed524000 r-xp 00000000 08:01 133549                     /usr/lib/x86_64-linux-gnu/sasl2/libsasldb.so.2.0.25
7fffed524000-7fffed723000 ---p 00006000 08:01 133549                     /usr/lib/x86_64-linux-gnu/sasl2/libsasldb.so.2.0.25
7fffed723000-7fffed724000 r--p 00005000 08:01 133549                     /usr/lib/x86_64-linux-gnu/sasl2/libsasldb.so.2.0.25
7fffed724000-7fffed725000 rw-p 00006000 08:01 133549                     /usr/lib/x86_64-linux-gnu/sasl2/libsasldb.so.2.0.25
7fffed725000-7fffed75a000 r--s 00000000 08:06 286723                     /var/cache/nscd/group
7fffed75a000-7fffed75b000 ---p 00000000 00:00 0 
7fffed75b000-7fffedf5b000 rw-p 00000000 00:00 0 
7fffedf5b000-7fffedf5c000 ---p 00000000 00:00 0 
7fffedf5c000-7fffee75c000 rw-p 00000000 00:00 0 
7fffee75c000-7fffee75d000 ---p 00000000 00:00 0 
7fffee75d000-7fffeef5d000 rw-p 00000000 00:00 0 
7fffeef5d000-7fffeef5e000 ---p 00000000 00:00 0 
7fffeef5e000-7fffef75e000 rw-p 00000000 00:00 0 
7fffef75e000-7fffef75f000 ---p 00000000 00:00 0 
7fffef75f000-7fffeff5f000 rw-p 00000000 00:00 0 
7fffeff5f000-7fffeff60000 ---p 00000000 00:00 0 
7fffeff60000-7ffff0760000 rw-p 00000000 00:00 0 
7ffff0760000-7ffff0761000 ---p 00000000 00:00 0 
7ffff0761000-7ffff0f61000 rw-p 00000000 00:00 0 
7ffff0f61000-7ffff0f62000 ---p 00000000 00:00 0 
7ffff0f62000-7ffff1762000 rw-p 00000000 00:00 0 
7ffff1762000-7ffff1763000 ---p 00000000 00:00 0 
7ffff1763000-7ffff1f63000 rw-p 00000000 00:00 0 
7ffff1f63000-7ffff1f64000 ---p 00000000 00:00 0 
7ffff1f64000-7ffff2764000 rw-p 00000000 00:00 0 
7ffff2764000-7ffff2799000 r--s 00000000 08:06 303114                     /var/cache/nscd/hosts
7ffff2799000-7ffff27ae000 r-xp 00000000 08:01 57404                      /lib/x86_64-linux-gnu/libgcc_s.so.1
7ffff27ae000-7ffff29ae000 ---p 00015000 08:01 57404                      /lib/x86_64-linux-gnu/libgcc_s.so.1
7ffff29ae000-7ffff29af000 rw-p 00015000 08:01 57404                      /lib/x86_64-linux-gnu/libgcc_s.so.1
7ffff29af000-7ffff29c7000 r-xp 00000000 08:01 110124                     /usr/lib/libfa.so.1.3.5
7ffff29c7000-7ffff2bc7000 ---p 00018000 08:01 110124                     /usr/lib/libfa.so.1.3.5
7ffff2bc7000-7ffff2bc8000 rw-p 00018000 08:01 110124                     /usr/lib/libfa.so.1.3.5
7ffff2bc8000-7ffff2be9000 r-xp 00000000 08:01 57814                      /lib/x86_64-linux-gnu/liblzma.so.5.0.0
7ffff2be9000-7ffff2de9000 ---p 00021000 08:01 57814                      /lib/x86_64-linux-gnu/liblzma.so.5.0.0
7ffff2de9000-7ffff2dea000 r--p 00021000 08:01 57814                      /lib/x86_64-linux-gnu/liblzma.so.5.0.0
7ffff2dea000-7ffff2deb000 rw-p 00022000 08:01 57814                      /lib/x86_64-linux-gnu/liblzma.so.5.0.0
7ffff2deb000-7ffff2e6c000 r-xp 00000000 08:01 57526                      /lib/x86_64-linux-gnu/libm-2.13.so
7ffff2e6c000-7ffff306b000 ---p 00081000 08:01 57526                      /lib/x86_64-linux-gnu/libm-2.13.so
7ffff306b000-7ffff306c000 r--p 00080000 08:01 57526                      /lib/x86_64-linux-gnu/libm-2.13.so
7ffff306c000-7ffff306d000 rw-p 00081000 08:01 57526                      /lib/x86_64-linux-gnu/libm-2.13.so
7ffff306d000-7ffff30a9000 r-xp 00000000 08:01 76972                      /usr/lib/x86_64-linux-gnu/libxslt.so.1.1.26
7ffff30a9000-7ffff32a8000 ---p 0003c000 08:01 76972                      /usr/lib/x86_64-linux-gnu/libxslt.so.1.1.26
7ffff32a8000-7ffff32aa000 r--p 0003b000 08:01 76972                      /usr/lib/x86_64-linux-gnu/libxslt.so.1.1.26
7ffff32aa000-7ffff32ab000 rw-p 0003d000 08:01 76972                      /usr/lib/x86_64-linux-gnu/libxslt.so.1.1.26
7ffff32ab000-7ffff32bf000 r-xp 00000000 08:01 76971                      /usr/lib/x86_64-linux-gnu/libexslt.so.0.8.15
7ffff32bf000-7ffff34be000 ---p 00014000 08:01 76971                      /usr/lib/x86_64-linux-gnu/libexslt.so.0.8.15
7ffff34be000-7ffff34bf000 r--p 00013000 08:01 76971                      /usr/lib/x86_64-linux-gnu/libexslt.so.0.8.15
7ffff34bf000-7ffff34c0000 rw-p 00014000 08:01 76971                      /usr/lib/x86_64-linux-gnu/libexslt.so.0.8.15
7ffff34c0000-7ffff3519000 r-xp 00000000 08:01 93870                      /usr/lib/libaugeas.so.0.15.0
7ffff3519000-7ffff3718000 ---p 00059000 08:01 93870                      /usr/lib/libaugeas.so.0.15.0
7ffff3718000-7ffff371b000 rw-p 00058000 08:01 93870                      /usr/lib/libaugeas.so.0.15.0
7ffff371b000-7ffff372e000 r-xp 00000000 08:01 57421                      /lib/x86_64-linux-gnu/libresolv-2.13.so
Program received signal SIGABRT, Aborted.
[Switching to Thread 0x7ffff1761700 (LWP 8216)]
0x00007ffff45c5475 in raise () from /lib/x86_64-linux-gnu/libc.so.6
(gdb) bt
#0  0x00007ffff45c5475 in raise () from /lib/x86_64-linux-gnu/libc.so.6
#1  0x00007ffff45c86f0 in abort () from /lib/x86_64-linux-gnu/libc.so.6
#2  0x00007ffff45ff2fb in ?? () from /lib/x86_64-linux-gnu/libc.so.6
#3  0x00007ffff4608b46 in ?? () from /lib/x86_64-linux-gnu/libc.so.6
#4  0x00007ffff460c428 in ?? () from /lib/x86_64-linux-gnu/libc.so.6
#5  0x00007ffff460d960 in malloc () from /lib/x86_64-linux-gnu/libc.so.6
#6  0x00007ffff4612912 in strdup () from /lib/x86_64-linux-gnu/libc.so.6
#7  0x00007ffff77b75c9 in virJSONValueObjectAppend (object=object entry=0x91d810, key=key entry=0x4fef81 "execute", value=value entry=0x85de90)
    at /build/buildd-libvirt_0.9.12-4-amd64-KyxbcZ/libvirt-0.9.12/./src/util/json.c:274
#8  0x00007ffff77b7e87 in virJSONValueObjectAppendString (object=object entry=0x91d810, key=key entry=0x4fef81 "execute", value=value entry=0x51196f "human-monitor-command")
    at /build/buildd-libvirt_0.9.12-4-amd64-KyxbcZ/libvirt-0.9.12/./src/util/json.c:296
#9  0x00000000004aa884 in qemuMonitorJSONMakeCommandRaw (wrap=wrap entry=false, cmdname=cmdname entry=0x51196f "human-monitor-command")
    at /build/buildd-libvirt_0.9.12-4-amd64-KyxbcZ/libvirt-0.9.12/./src/qemu/qemu_monitor_json.c:404
#10 0x00000000004ac3a7 in qemuMonitorJSONHumanCommandWithFd (mon=mon entry=0x7fffe80010b0, cmd_str=<optimized out>, scm_fd=-1, reply_str=0x7ffff1760920)
    at /build/buildd-libvirt_0.9.12-4-amd64-KyxbcZ/libvirt-0.9.12/./src/qemu/qemu_monitor_json.c:886
#11 0x000000000049d303 in qemuMonitorHMPCommandWithFd (mon=mon entry=0x7fffe80010b0, cmd=<optimized out>, scm_fd=scm_fd entry=-1, reply=reply entry=0x7ffff1760920)
    at /build/buildd-libvirt_0.9.12-4-amd64-KyxbcZ/libvirt-0.9.12/./src/qemu/qemu_monitor.c:910
#12 0x00000000004a8bfe in qemuMonitorTextAddDrive (mon=mon entry=0x7fffe80010b0, drivestr=drivestr entry=0x7fffe0202020 "file=/dev/nbd0,if=none,id=drive-virtio-disk3,format=raw")
    at /build/buildd-libvirt_0.9.12-4-amd64-KyxbcZ/libvirt-0.9.12/./src/qemu/qemu_monitor_text.c:2836
#13 0x00000000004b0814 in qemuMonitorJSONAddDrive (mon=0x7fffe80010b0, drivestr=0x7fffe0202020 "file=/dev/nbd0,if=none,id=drive-virtio-disk3,format=raw")
    at /build/buildd-libvirt_0.9.12-4-amd64-KyxbcZ/libvirt-0.9.12/./src/qemu/qemu_monitor_json.c:2979
#14 0x00000000004a1bad in qemuMonitorAddDrive (mon=<optimized out>, drivestr=<optimized out>) at /build/buildd-libvirt_0.9.12-4-amd64-KyxbcZ/libvirt-0.9.12/./src/qemu/qemu_monitor.c:2571
#15 0x0000000000484a5d in qemuDomainAttachPciDiskDevice (conn=conn entry=0x7fffe00111f0, driver=driver entry=0x81fec0, vm=vm entry=0x82f6b0, disk=disk entry=0x7fffe02024d0)
    at /build/buildd-libvirt_0.9.12-4-amd64-KyxbcZ/libvirt-0.9.12/./src/qemu/qemu_hotplug.c:250
#16 0x0000000000461d9e in qemuDomainAttachDeviceDiskLive (vm=0x82f6b0, driver=0x81fec0, conn=0x7fffe00111f0, dev=<optimized out>)
    at /build/buildd-libvirt_0.9.12-4-amd64-KyxbcZ/libvirt-0.9.12/./src/qemu/qemu_driver.c:5179
#17 qemuDomainAttachDeviceLive (dev=0x7fffe001d5b0, vm=0x82f6b0, dom=<optimized out>) at /build/buildd-libvirt_0.9.12-4-amd64-KyxbcZ/libvirt-0.9.12/./src/qemu/qemu_driver.c:5238
#18 qemuDomainModifyDeviceFlags (dom=<optimized out>, xml=0x7fffe001d5b0 "\001", flags=<optimized out>, action=<optimized out>)
    at /build/buildd-libvirt_0.9.12-4-amd64-KyxbcZ/libvirt-0.9.12/./src/qemu/qemu_driver.c:5779
#19 0x00007ffff7846f5d in virDomainAttachDevice (domain=domain entry=0x7fffe0201fb0, 
    xml=0x7fffe0201e50 "<disk type='block'>\n  <driver name='qemu' type='raw'/>\n  <source dev='/dev/nbd0'/>\n  <target dev='vdd'/>\n</disk>\n")
    at /build/buildd-libvirt_0.9.12-4-amd64-KyxbcZ/libvirt-0.9.12/./src/libvirt.c:9288
#20 0x000000000043ccfe in remoteDispatchDomainAttachDevice (args=0x7fffe0201ff0, rerr=0x7ffff1760c90, client=<optimized out>, server=<optimized out>, msg=<optimized out>)
    at /build/buildd-libvirt_0.9.12-4-amd64-KyxbcZ/libvirt-0.9.12/./daemon/remote_dispatch.h:320
#21 remoteDispatchDomainAttachDeviceHelper (server=<optimized out>, client=<optimized out>, msg=<optimized out>, rerr=0x7ffff1760c90, args=0x7fffe0201ff0, ret=<optimized out>)
    at /build/buildd-libvirt_0.9.12-4-amd64-KyxbcZ/libvirt-0.9.12/./daemon/remote_dispatch.h:298
#22 0x00007ffff788a866 in virNetServerProgramDispatchCall (msg=0x7fffe8093d20, client=0x7fffe8053050, server=0x76e920, prog=0x778880)
    at /build/buildd-libvirt_0.9.12-4-amd64-KyxbcZ/libvirt-0.9.12/./src/rpc/virnetserverprogram.c:416
#23 virNetServerProgramDispatch (prog=0x778880, server=server entry=0x76e920, client=0x7fffe8053050, msg=0x7fffe8093d20)
    at /build/buildd-libvirt_0.9.12-4-amd64-KyxbcZ/libvirt-0.9.12/./src/rpc/virnetserverprogram.c:289
#24 0x00007ffff78864d1 in virNetServerHandleJob (jobOpaque=<optimized out>, opaque=0x76e920) at /build/buildd-libvirt_0.9.12-4-amd64-KyxbcZ/libvirt-0.9.12/./src/rpc/virnetserver.c:161
#25 0x00007ffff77c373e in virThreadPoolWorker (opaque=opaque entry=0x7789a0) at /build/buildd-libvirt_0.9.12-4-amd64-KyxbcZ/libvirt-0.9.12/./src/util/threadpool.c:144
#26 0x00007ffff77c31c9 in virThreadHelper (data=<optimized out>) at /build/buildd-libvirt_0.9.12-4-amd64-KyxbcZ/libvirt-0.9.12/./src/util/threads-pthread.c:161
#27 0x00007ffff4d27b50 in start_thread () from /lib/x86_64-linux-gnu/libpthread.so.0
#28 0x00007ffff466b6dd in clone () from /lib/x86_64-linux-gnu/libc.so.6
#29 0x0000000000000000 in ?? ()
(gdb) f 7
#7  0x00007ffff77b75c9 in virJSONValueObjectAppend (object=object entry=0x91d810, key=key entry=0x4fef81 "execute", value=value entry=0x85de90)
    at /build/buildd-libvirt_0.9.12-4-amd64-KyxbcZ/libvirt-0.9.12/./src/util/json.c:274
warning: Source file is more recent than executable.
274         if (!(newkey = strdup(key)))
(gdb) l
269             return -1;
270
271         if (virJSONValueObjectHasKey(object, key))
272             return -1;
273
274         if (!(newkey = strdup(key)))
275             return -1;
276
277         if (VIR_REALLOC_N(object->data.object.pairs,
278                           object->data.object.npairs + 1) < 0) {
(gdb) 

2) another situation:
Program received signal SIGABRT, Aborted.
[Switching to Thread 0x7ffff075f700 (LWP 11697)]
0x00007ffff45c5475 in raise () from /lib/x86_64-linux-gnu/libc.so.6
(gdb) bt
#0  0x00007ffff45c5475 in raise () from /lib/x86_64-linux-gnu/libc.so.6
#1  0x00007ffff45c86f0 in abort () from /lib/x86_64-linux-gnu/libc.so.6
#2  0x00007ffff45ff2fb in ?? () from /lib/x86_64-linux-gnu/libc.so.6
#3  0x00007ffff4608b46 in ?? () from /lib/x86_64-linux-gnu/libc.so.6
#4  0x00007ffff460d87c in free () from /lib/x86_64-linux-gnu/libc.so.6
#5  0x00007ffff77ba4c9 in virFree (ptrptr=ptrptr entry=0x7ffff075e8e8) at /build/buildd-libvirt_0.9.12-4-amd64-KyxbcZ/libvirt-0.9.12/./src/util/memory.c:310
#6  0x000000000049d321 in qemuMonitorHMPCommandWithFd (mon=mon entry=0x9214e0, cmd=<optimized out>, scm_fd=scm_fd entry=-1, reply=reply entry=0x7ffff075e920)
    at /build/buildd-libvirt_0.9.12-4-amd64-KyxbcZ/libvirt-0.9.12/./src/qemu/qemu_monitor.c:916
#7  0x00000000004a8bfe in qemuMonitorTextAddDrive (mon=mon entry=0x9214e0, drivestr=drivestr entry=0x8f7090 "file=/dev/nbd0,if=none,id=drive-virtio-disk3,format=raw")
    at /build/buildd-libvirt_0.9.12-4-amd64-KyxbcZ/libvirt-0.9.12/./src/qemu/qemu_monitor_text.c:2836
#8  0x00000000004b0814 in qemuMonitorJSONAddDrive (mon=0x9214e0, drivestr=0x8f7090 "file=/dev/nbd0,if=none,id=drive-virtio-disk3,format=raw")
    at /build/buildd-libvirt_0.9.12-4-amd64-KyxbcZ/libvirt-0.9.12/./src/qemu/qemu_monitor_json.c:2979
#9  0x00000000004a1bad in qemuMonitorAddDrive (mon=<optimized out>, drivestr=<optimized out>) at /build/buildd-libvirt_0.9.12-4-amd64-KyxbcZ/libvirt-0.9.12/./src/qemu/qemu_monitor.c:2571
#10 0x0000000000484a5d in qemuDomainAttachPciDiskDevice (conn=conn entry=0x9213c0, driver=driver entry=0x8162c0, vm=vm entry=0x820530, disk=disk entry=0x8f5290)
    at /build/buildd-libvirt_0.9.12-4-amd64-KyxbcZ/libvirt-0.9.12/./src/qemu/qemu_hotplug.c:250
#11 0x0000000000461d9e in qemuDomainAttachDeviceDiskLive (vm=0x820530, driver=0x8162c0, conn=0x9213c0, dev=<optimized out>)
    at /build/buildd-libvirt_0.9.12-4-amd64-KyxbcZ/libvirt-0.9.12/./src/qemu/qemu_driver.c:5179
#12 qemuDomainAttachDeviceLive (dev=0x8465b0, vm=0x820530, dom=<optimized out>) at /build/buildd-libvirt_0.9.12-4-amd64-KyxbcZ/libvirt-0.9.12/./src/qemu/qemu_driver.c:5238
#13 qemuDomainModifyDeviceFlags (dom=<optimized out>, xml=0x8465b0 "\001", flags=<optimized out>, action=<optimized out>)
    at /build/buildd-libvirt_0.9.12-4-amd64-KyxbcZ/libvirt-0.9.12/./src/qemu/qemu_driver.c:5779
#14 0x00007ffff7846f5d in virDomainAttachDevice (domain=domain entry=0x8f6080, 
    xml=0x8f5610 "<disk type='block'>\n  <driver name='qemu' type='raw'/>\n  <source dev='/dev/nbd0'/>\n  <target dev='vdd'/>\n</disk>\n")
    at /build/buildd-libvirt_0.9.12-4-amd64-KyxbcZ/libvirt-0.9.12/./src/libvirt.c:9288
#15 0x000000000043ccfe in remoteDispatchDomainAttachDevice (args=0x8f60c0, rerr=0x7ffff075ec90, client=<optimized out>, server=<optimized out>, msg=<optimized out>)
    at /build/buildd-libvirt_0.9.12-4-amd64-KyxbcZ/libvirt-0.9.12/./daemon/remote_dispatch.h:320
#16 remoteDispatchDomainAttachDeviceHelper (server=<optimized out>, client=<optimized out>, msg=<optimized out>, rerr=0x7ffff075ec90, args=0x8f60c0, ret=<optimized out>)
    at /build/buildd-libvirt_0.9.12-4-amd64-KyxbcZ/libvirt-0.9.12/./daemon/remote_dispatch.h:298
#17 0x00007ffff788a866 in virNetServerProgramDispatchCall (msg=0x7fffe00929d0, client=0x7fffe0052880, server=0x76e920, prog=0x778880)
    at /build/buildd-libvirt_0.9.12-4-amd64-KyxbcZ/libvirt-0.9.12/./src/rpc/virnetserverprogram.c:416
#18 virNetServerProgramDispatch (prog=0x778880, server=server entry=0x76e920, client=0x7fffe0052880, msg=0x7fffe00929d0)
    at /build/buildd-libvirt_0.9.12-4-amd64-KyxbcZ/libvirt-0.9.12/./src/rpc/virnetserverprogram.c:289
#19 0x00007ffff78864d1 in virNetServerHandleJob (jobOpaque=<optimized out>, opaque=0x76e920) at /build/buildd-libvirt_0.9.12-4-amd64-KyxbcZ/libvirt-0.9.12/./src/rpc/virnetserver.c:161
#20 0x00007ffff77c373e in virThreadPoolWorker (opaque=opaque entry=0x7789a0) at /build/buildd-libvirt_0.9.12-4-amd64-KyxbcZ/libvirt-0.9.12/./src/util/threadpool.c:144
#21 0x00007ffff77c31c9 in virThreadHelper (data=<optimized out>) at /build/buildd-libvirt_0.9.12-4-amd64-KyxbcZ/libvirt-0.9.12/./src/util/threads-pthread.c:161
#22 0x00007ffff4d27b50 in start_thread () from /lib/x86_64-linux-gnu/libpthread.so.0
#23 0x00007ffff466b6dd in clone () from /lib/x86_64-linux-gnu/libc.so.6
#24 0x0000000000000000 in ?? ()
(gdb) f 6
#6  0x000000000049d321 in qemuMonitorHMPCommandWithFd (mon=mon entry=0x9214e0, cmd=<optimized out>, scm_fd=scm_fd entry=-1, reply=reply entry=0x7ffff075e920)
    at /build/buildd-libvirt_0.9.12-4-amd64-KyxbcZ/libvirt-0.9.12/./src/qemu/qemu_monitor.c:916
916         VIR_FREE(json_cmd);
(gdb) l
911         } else {
912             ret = qemuMonitorTextCommandWithFd(mon, cmd, scm_fd, reply);
913         }
914
915     cleanup:
916         VIR_FREE(json_cmd);
917         return ret;
918     }
919
920     /* Ensure proper locking around callbacks.  */
(gdb) p json_cmd
$3 = 0x933c20 "drive_add dummy file=/dev/nbd0,if=none,id=drive-virtio-disk3,format=raw"
(gdb) 

anybody can give me any clue?  Thanks in advance!

2012-08-16
Wangpan


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