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Description of problem:
libvirtd crash when hotplug a serial dev with --config
Version-Release number of selected component (if applicable):
libvirt-3.1.0-2.el7.x86_64
How reproducible:
100%
Steps to Reproduce:
1. having a serial dev as following
# cat serial.xml
<serial type='dev'>
<source path='/dev/ttyS0'/>
<target port='0'/>
</serial>
2. do hotplug with --config
# virsh list
Id Name State
----------------------------------------------------
16 vm2 running
# virsh attach-device vm2 serial.xml --config
error: Disconnected from qemu:///system due to I/O error
error: Failed to attach device from serial.xml
error: End of file while reading data: Input/output error
Actual results:
libvirtd crash
Expected results:
libvirtd will not crash
Additional info:
Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 0x7f9cd757f700 (LWP 24622)]
virDomainChrSourceDefIsEqual (src=0x7f9cc0000990, tgt=0x0) at conf/domain_conf.c:2070
2070 if (tgt->type != src->type)
(gdb) bt
#0 virDomainChrSourceDefIsEqual (src=0x7f9cc0000990, tgt=0x0) at conf/domain_conf.c:2070
#1 0x00007f9ce80cdbca in virDomainDefAddConsoleCompat (def=0x7f9cc00133f0) at conf/domain_conf.c:3897
#2 virDomainDefAddImplicitDevices (def=def@entry=0x7f9cc00133f0) at conf/domain_conf.c:20193
#3 0x00007f9ce80ceacd in virDomainDefPostParseInternal (data=0x7f9cd757e840, def=0x7f9cc00133f0) at conf/domain_conf.c:4614
#4 virDomainDefPostParse (def=def@entry=0x7f9cc00133f0, caps=caps@entry=0x7f9c74235b20, parseFlags=parseFlags@entry=514, xmlopt=xmlopt@entry=0x7f9c742fd3b0,
parseOpaque=parseOpaque@entry=0x0) at conf/domain_conf.c:4679
#5 0x00007f9c9364679b in qemuDomainAttachDeviceConfig (parse_flags=514, xmlopt=0x7f9c742fd3b0, caps=0x7f9c74235b20, conn=0x7f9ccc000b10, dev=0x7f9cc0002900,
vmdef=<optimized out>) at qemu/qemu_driver.c:7751
#6 qemuDomainAttachDeviceLiveAndConfig (flags=2, xml=<optimized out>, driver=0x7f9c74106df0, vm=0x7f9c742f8f00, conn=0x7f9ccc000b10) at qemu/qemu_driver.c:8059
#7 qemuDomainAttachDeviceFlags (dom=<optimized out>, xml=<optimized out>, flags=2) at qemu/qemu_driver.c:8126
#8 0x00007f9ce817bcd7 in virDomainAttachDeviceFlags (domain=domain@entry=0x7f9cc0000bd0,
xml=0x7f9cc0000c40 "<serial type='dev'>\n <source path='/dev/ttyS0'/>\n <target port='0'/>\n </serial>\n", flags=2) at libvirt-domain.c:8156
#9 0x00007f9ce8fed2a5 in remoteDispatchDomainAttachDeviceFlags (server=0x7f9ceb12b390, msg=0x7f9ceb1545e0, args=0x7f9cc00008c0, rerr=0x7f9cd757ec00,
client=<optimized out>) at remote_dispatch.h:3514
#10 remoteDispatchDomainAttachDeviceFlagsHelper (server=0x7f9ceb12b390, client=<optimized out>, msg=0x7f9ceb1545e0, rerr=0x7f9cd757ec00, args=0x7f9cc00008c0,
ret=0x7f9cc0000c20) at remote_dispatch.h:3490
#11 0x00007f9ce820977c in virNetServerProgramDispatchCall (msg=0x7f9ceb1545e0, client=0x7f9ceb1537a0, server=0x7f9ceb12b390, prog=0x7f9ceb14e950)
at rpc/virnetserverprogram.c:437
#12 virNetServerProgramDispatch (prog=0x7f9ceb14e950, server=server@entry=0x7f9ceb12b390, client=client@entry=0x7f9ceb1537a0, msg=msg@entry=0x7f9ceb1545e0)
at rpc/virnetserverprogram.c:307
#13 0x00007f9ce901ac3a in virNetServerProcessMsg (srv=srv@entry=0x7f9ceb12b390, client=0x7f9ceb1537a0, prog=<optimized out>, msg=0x7f9ceb1545e0) at rpc/virnetserver.c:148
#14 0x00007f9ce901b038 in virNetServerHandleJob (jobOpaque=<optimized out>, opaque=0x7f9ceb12b390) at rpc/virnetserver.c:169
#15 0x00007f9ce8083fa1 in virThreadPoolWorker (opaque=opaque@entry=0x7f9ceb120160) at util/virthreadpool.c:167
#16 0x00007f9ce8082d70 in virThreadHelper (data=<optimized out>) at util/virthread.c:206
#17 0x00007f9ce51a7dc5 in start_thread () from /lib64/libpthread.so.0
#18 0x00007f9ce4ed673d in clone () from /lib64/libc.so.6
Comment 2Jaroslav Suchanek
2017-04-05 08:55:10 UTC
I do not see a crash using libvirt-3.2.0-1.el7.x86_64. Can you please re-try with that build? Thanks.
Hi,
I tried with libvirt-3.2.0-1.el7.x86_64.
And I found
A crash will happen if there is no serial device in guest XML configuration.
It can attach successfully if the running guest already has serial devices.
Thanks.
Upstream fix:
commit ff6e94de60b081ae7e9d304e38c63346828c5dbe
Refs: v3.4.0-59-gff6e94de6
Author: Erik Skultety <eskultet>
AuthorDate: Mon May 29 12:58:34 2017 +0200
Commit: Erik Skultety <eskultet>
CommitDate: Wed Jun 7 14:17:56 2017 +0200
qemu: Fix serial stub console allocation
When adding the aliased serial stub console, the structure wasn't
properly allocated (VIR_ALLOC instead of virDomainChrDefNew) which then
resulted in SIGSEGV in virDomainChrSourceIsEqual during a serial device
coldplug.
https://bugzilla.redhat.com/show_bug.cgi?id=1434278
Signed-off-by: Erik Skultety <eskultet>
Verified with libvirt-3.2.0-9.el7.x86_64 and qemu-kvm-rhev-2.9.0-7.el7.x86_64
# virsh start rhel7
error: Failed to start domain rhel7
error: XML error: need at least one serial port to use SGA
# virsh attach-device rhel7 serial.xml --config
Device attached successfully
No crash happened. Then start the vm again.
# virsh start rhel7
Domain rhel7 started
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.
For information on the advisory, and where to find the updated
files, follow the link below.
If the solution does not work for you, open a new bug report.
https://access.redhat.com/errata/RHEA-2017:1846
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.
For information on the advisory, and where to find the updated
files, follow the link below.
If the solution does not work for you, open a new bug report.
https://access.redhat.com/errata/RHEA-2017:1846
Description of problem: libvirtd crash when hotplug a serial dev with --config Version-Release number of selected component (if applicable): libvirt-3.1.0-2.el7.x86_64 How reproducible: 100% Steps to Reproduce: 1. having a serial dev as following # cat serial.xml <serial type='dev'> <source path='/dev/ttyS0'/> <target port='0'/> </serial> 2. do hotplug with --config # virsh list Id Name State ---------------------------------------------------- 16 vm2 running # virsh attach-device vm2 serial.xml --config error: Disconnected from qemu:///system due to I/O error error: Failed to attach device from serial.xml error: End of file while reading data: Input/output error Actual results: libvirtd crash Expected results: libvirtd will not crash Additional info: Program received signal SIGSEGV, Segmentation fault. [Switching to Thread 0x7f9cd757f700 (LWP 24622)] virDomainChrSourceDefIsEqual (src=0x7f9cc0000990, tgt=0x0) at conf/domain_conf.c:2070 2070 if (tgt->type != src->type) (gdb) bt #0 virDomainChrSourceDefIsEqual (src=0x7f9cc0000990, tgt=0x0) at conf/domain_conf.c:2070 #1 0x00007f9ce80cdbca in virDomainDefAddConsoleCompat (def=0x7f9cc00133f0) at conf/domain_conf.c:3897 #2 virDomainDefAddImplicitDevices (def=def@entry=0x7f9cc00133f0) at conf/domain_conf.c:20193 #3 0x00007f9ce80ceacd in virDomainDefPostParseInternal (data=0x7f9cd757e840, def=0x7f9cc00133f0) at conf/domain_conf.c:4614 #4 virDomainDefPostParse (def=def@entry=0x7f9cc00133f0, caps=caps@entry=0x7f9c74235b20, parseFlags=parseFlags@entry=514, xmlopt=xmlopt@entry=0x7f9c742fd3b0, parseOpaque=parseOpaque@entry=0x0) at conf/domain_conf.c:4679 #5 0x00007f9c9364679b in qemuDomainAttachDeviceConfig (parse_flags=514, xmlopt=0x7f9c742fd3b0, caps=0x7f9c74235b20, conn=0x7f9ccc000b10, dev=0x7f9cc0002900, vmdef=<optimized out>) at qemu/qemu_driver.c:7751 #6 qemuDomainAttachDeviceLiveAndConfig (flags=2, xml=<optimized out>, driver=0x7f9c74106df0, vm=0x7f9c742f8f00, conn=0x7f9ccc000b10) at qemu/qemu_driver.c:8059 #7 qemuDomainAttachDeviceFlags (dom=<optimized out>, xml=<optimized out>, flags=2) at qemu/qemu_driver.c:8126 #8 0x00007f9ce817bcd7 in virDomainAttachDeviceFlags (domain=domain@entry=0x7f9cc0000bd0, xml=0x7f9cc0000c40 "<serial type='dev'>\n <source path='/dev/ttyS0'/>\n <target port='0'/>\n </serial>\n", flags=2) at libvirt-domain.c:8156 #9 0x00007f9ce8fed2a5 in remoteDispatchDomainAttachDeviceFlags (server=0x7f9ceb12b390, msg=0x7f9ceb1545e0, args=0x7f9cc00008c0, rerr=0x7f9cd757ec00, client=<optimized out>) at remote_dispatch.h:3514 #10 remoteDispatchDomainAttachDeviceFlagsHelper (server=0x7f9ceb12b390, client=<optimized out>, msg=0x7f9ceb1545e0, rerr=0x7f9cd757ec00, args=0x7f9cc00008c0, ret=0x7f9cc0000c20) at remote_dispatch.h:3490 #11 0x00007f9ce820977c in virNetServerProgramDispatchCall (msg=0x7f9ceb1545e0, client=0x7f9ceb1537a0, server=0x7f9ceb12b390, prog=0x7f9ceb14e950) at rpc/virnetserverprogram.c:437 #12 virNetServerProgramDispatch (prog=0x7f9ceb14e950, server=server@entry=0x7f9ceb12b390, client=client@entry=0x7f9ceb1537a0, msg=msg@entry=0x7f9ceb1545e0) at rpc/virnetserverprogram.c:307 #13 0x00007f9ce901ac3a in virNetServerProcessMsg (srv=srv@entry=0x7f9ceb12b390, client=0x7f9ceb1537a0, prog=<optimized out>, msg=0x7f9ceb1545e0) at rpc/virnetserver.c:148 #14 0x00007f9ce901b038 in virNetServerHandleJob (jobOpaque=<optimized out>, opaque=0x7f9ceb12b390) at rpc/virnetserver.c:169 #15 0x00007f9ce8083fa1 in virThreadPoolWorker (opaque=opaque@entry=0x7f9ceb120160) at util/virthreadpool.c:167 #16 0x00007f9ce8082d70 in virThreadHelper (data=<optimized out>) at util/virthread.c:206 #17 0x00007f9ce51a7dc5 in start_thread () from /lib64/libpthread.so.0 #18 0x00007f9ce4ed673d in clone () from /lib64/libc.so.6