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Re: [Qemu-devel] qemu segfault, possible VNC related?

From: Kolbe Kegel
Subject: Re: [Qemu-devel] qemu segfault, possible VNC related?
Date: Fri, 20 Oct 2006 19:37:30 -0700


Anthony Liguori suggested on freenode #qemu that I try this from a CVS bulid, which I did, but now I just have this :-P



On 19Oct , 2006, at 16:48, Kolbe Kegel wrote:


I've only recently begun using QEMU, and I'm having problems with frequent segfaults when I try to boot from an Ubuntu live CD.

This is 0.8.2, and I verified this on 2 separate machines.

Oddly, when I started QEMU w/ the -s option and connected gdb remotely, Ubuntu booted to its desktop without any problems.

I don't have SDL available to test at this time, but some initial observations suggest that this segfault may only occur when connecting to the VNC server using TightVNC.

I believe the problems are related to VNC, based on this backtrace:

[Switching to Thread 182894085344 (LWP 27253)]
0x0000003243270fb7 in memset () from /lib64/tls/libc.so.6
(gdb) bt
#0  0x0000003243270fb7 in memset () from /lib64/tls/libc.so.6
#1 0x000000000045bb58 in protocol_client_msg (vs=0x25e3e80, data=Variable "data" is not available.
) at /data1/users/kkegel/qemu-0.8.2/vnc.c:735
#2 0x000000000045ae2f in vnc_client_read (opaque=Variable "opaque" is not available.
) at /data1/users/kkegel/qemu-0.8.2/vnc.c:582
#3 0x00000000004091cd in main_loop_wait (timeout=Variable "timeout" is not available.
) at /data1/users/kkegel/qemu-0.8.2/vl.c:5013
#4 0x0000000000409358 in main_loop () at /data1/users/kkegel/ qemu-0.8.2/vl.c:5112 #5 0x000000000040a6a5 in main (argc=7, argv=0x2) at /data1/users/ kkegel/qemu-0.8.2/vl.c:6221
(gdb) bt full
#0  0x0000003243270fb7 in memset () from /lib64/tls/libc.so.6
No symbol table info available.
#1 0x000000000045bb58 in protocol_client_msg (vs=0x25e3e80, data=Variable "data" is not available.
) at /data1/users/kkegel/qemu-0.8.2/vnc.c:735
        i = Variable "i" is not available.

Let me know if there is further information I can provide that may be of use.

(forgive me for not checking for forums; Host qemu.dad-answers.com not found: 3(NXDOMAIN))


Kolbe Kegel

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