Red Hat Bugzilla – Bug 972787
qemu segfault when quickly closing virt-manager VM view
Last modified: 2015-02-17 10:31:26 EST
I hit that issue when trying to reproduce https://bugzilla.redhat.com/show_bug.cgi?id=901880
Steps to reproduce:
- start virt-manager
- double click on a running VM to connect to it (I used a win7 VM)
- quickly close it with alt+f4 (make sure the cursor is outside of the VM window so that it's not grabbed)
- repeat that 5 to 10 times
Result: qemu crashes on a spice-server assert:
#0 0x00007f001b9bc819 in __GI_raise (sig=sig@entry=6) at ../nptl/sysdeps/unix/sysv/linux/raise.c:56
#1 0x00007f001b9bdf28 in __GI_abort () at abort.c:90
#2 0x00007f001c7722dc in spice_logv (log_domain=0x7f001c7e8086 "Spice", log_level=SPICE_LOG_LEVEL_ERROR,
strloc=0x7f001c7ebe6c "red_channel.c:1967", function=0x7f001c7ebf50 <__FUNCTION__.22670> "red_client_destroy",
format=0x7f001c7e805e "assertion `%s' failed", args=args@entry=0x7fff5fe95db8) at log.c:109
#3 0x00007f001c772428 in spice_log (log_domain=log_domain@entry=0x7f001c7e8086 "Spice",
log_level=log_level@entry=SPICE_LOG_LEVEL_ERROR, strloc=strloc@entry=0x7f001c7ebe6c "red_channel.c:1967",
function=function@entry=0x7f001c7ebf50 <__FUNCTION__.22670> "red_client_destroy",
format=format@entry=0x7f001c7e805e "assertion `%s' failed") at log.c:123
#4 0x00007f001c72f17a in red_client_destroy (client=client@entry=0x7f0023a01490) at red_channel.c:1967
#5 0x00007f001c755255 in reds_client_disconnect (client=0x7f0023a01490) at reds.c:570
#6 0x00007f001c72a441 in red_peer_handle_incoming (handler=0x7f0023ab40e0, stream=0x7f0023a2e9d0) at red_channel.c:300
#7 red_channel_client_receive (rcc=rcc@entry=0x7f0023aaffd0) at red_channel.c:309
#8 0x00007f001c72c2dc in red_channel_client_event (fd=<optimized out>, event=1, data=0x7f0023aaffd0) at red_channel.c:1440
#9 0x00007f00228ce787 in qemu_iohandler_poll (readfds=readfds@entry=0x7f002325f4e0 <rfds>,
writefds=writefds@entry=0x7f002325f460 <wfds>, xfds=xfds@entry=0x7f002325f3e0 <xfds>, ret=ret@entry=8) at iohandler.c:159
#10 0x00007f00228d3cde in main_loop_wait (nonblocking=<optimized out>) at main-loop.c:417
#11 0x00007f00227aea55 in main_loop () at vl.c:2001
#12 main (argc=<optimized out>, argv=<optimized out>, envp=<optimized out>) at vl.c:4326
#5 corresponds to 'spice_assert(ring_is_empty(&rcc->pipe));'
I saw this already, it's reported I think, maybe similar to something Yonit is working. There is a double free, caused by client destroy happening twice. I don't think I'll get back to it this week so feel free to bug me if I can help you tackle this.
I'm not sure this is a double free here,the structures seem consistent, but rcc->pipe contains one item (type 110, the channel seems to be a display channel, which would correspond to a PIPE_ITEM_TYPE_UPGRADE item (?))
Could this be fixed by the ring remove safeness fixes done recently ?
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