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d53c57b806
Commit id '4313fead' added a call to virDomainPanicCheckABIStability()
which did not check whether the panic device existed before making a call
to virDomainDeviceInfoCheckABIStability() which ended up segfaulting:
Thread 1 (Thread 0x7f5332837700 (LWP 10964)):
(src=<optimized out>, dst=<optimized out>)
at conf/domain_conf.c:13007
(dst=<optimized out>, src=<optimized out>)
at conf/domain_conf.c:13712
(src=<optimized out>, dst=<optimized out>)
at conf/domain_conf.c:14056
(domain=domain@entry=0x7f53000057c0, vm=vm@entry=0x7f53000036d0,
defptr=defptr@entry=0x7f5332836978, snap=snap@entry=0x7f5332836970,
update_current=update_current@entry=0x7f5332836962, flags=flags@entry=1)
at conf/snapshot_conf.c:1230
(domain=0x7f53000057c0, xmlDesc=<optimized out>, flags=1)
at qemu/qemu_driver.c:12719
(domain=domain@entry=0x7f53000057c0, xmlDesc=0x7f53000081d0
"<domainsnapshot>\n <name>snap2</name>\n
<description>new-desc</description>\n <state>running</state>\n
<parent>\n <name>snap1</name>\n </parent>\n
<creationTime>1387487268</creationTime>\n <memory s"..., flags=1)
at libvirt.c:19695
...
(gdb) up 3
(gdb) print *other->def->dom
$2 = {virtType = 2, id = -1, ..
...
rng = 0x0, panic = 0x0, namespaceData = 0x0,...
...
(gdb) print *def->dom
$3 = {virtType = 2, id = -1, ...
...
rng = 0x0, panic = 0x0, namespaceData = 0x0,...
...
(gdb)
Also seen using following sequence:
virsh save $dom $file
virsh save-image-edit $file
add (or remove) a <panic/> line
<devices>
...
<panic>
<address type='isa' iobase='0x505'/>
</panic>
...
</devices>