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Re: [Qemu-devel] Re: qemu crashes since today


From: Stefan Berger
Subject: Re: [Qemu-devel] Re: qemu crashes since today
Date: Wed, 16 Feb 2011 20:35:10 -0500
User-agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.2.13) Gecko/20101209 Fedora/3.1.7-0.35.b3pre.fc14 Lightning/1.0b3pre Thunderbird/3.1.7

On 02/16/2011 05:45 PM, Jan Kiszka wrote:
On 2011-02-16 23:18, Stefan Berger wrote:
Qemu is crashing for me. Bisecting the code I found this here as the
reason. Stepping one commit further into the past does not cause the crash.

6792a57bf19ab37f61f5acf0f8e3003cf08814af is the first bad commit
commit 6792a57bf19ab37f61f5acf0f8e3003cf08814af
Author: Jan Kiszka<address@hidden>
Date:   Mon Feb 7 12:19:18 2011 +0100


I get crashes while booting FC14 on a FC14 host, both 64bit. Host
running 2.6.35.11-83.fc14 . Crashes typically happen when udev has
stared in the guest.

This is the command line I was using:

./x86_64-softmmu/qemu-system-x86_64 \
       -hda ~images/fc14-x86_64.img \
       -m 2048 \
       -enable-kvm \
       -boot menu=on \
       -chardev stdio,id=seabios \
       -device isa-debugcon,iobase=0x402,chardev=seabios

With our without --enable-io-thread? How does the crash look like,
specifically when caught by gdb (backtrace, variable states)?

./configure --target-list="x86_64-softmmu" --enable-kvm

the backtrace:

Booting from Hard Disk...
Booting from 0000:7c00
[New Thread 0x7fff51244700 (LWP 28825)]
*** stack smashing detected ***: /home/stefanb/qemu/qemu-git/x86_64-softmmu/qemu
-system-x86_64 terminated

Program received signal SIGSEGV, Segmentation fault.
0x0000003883a0f09c in ?? () from /lib64/libgcc_s.so.1
(gdb) thread apply all bt

Thread 2 (Thread 0x7fff51244700 (LWP 28825)):
#0  0x00007ffff79c571e in pthread_cond_timedwait@@GLIBC_2.3.2 ()
   from /lib64/libpthread.so.0
#1  0x000000000043b1eb in cond_timedwait (unused=<value optimized out>)
    at posix-aio-compat.c:104
#2  aio_thread (unused=<value optimized out>) at posix-aio-compat.c:325
#3  0x00007ffff79c0ccb in start_thread () from /lib64/libpthread.so.0
#4  0x00007ffff6a2cc2d in clone () from /lib64/libc.so.6

Thread 1 (Thread 0x7ffff7fc8820 (LWP 28818)):
#0  0x0000003883a0f09c in ?? () from /lib64/libgcc_s.so.1
#1  0x0000003883a0fc59 in _Unwind_Backtrace () from /lib64/libgcc_s.so.1
#2  0x00007ffff6a42520 in backtrace () from /lib64/libc.so.6
#3  0x00007ffff69bbd0f in __libc_message () from /lib64/libc.so.6
#4  0x00007ffff6a46127 in __fortify_fail () from /lib64/libc.so.6
#5  0x00007ffff6a460f0 in __stack_chk_fail () from /lib64/libc.so.6
#6  0x000000000042c669 in kvm_cpu_exec (env=0x1179310)
    at /home/stefanb/qemu/qemu-git/kvm-all.c:1005
#7  0x0000000000000001 in ?? ()
#8  0x000000000040bc18 in cpu_exec_all ()
    at /home/stefanb/qemu/qemu-git/cpus.c:1097
#9  0x000000000056d914 in main_loop (argc=<value optimized out>,
    argv=<value optimized out>, envp=<value optimized out>)
    at /home/stefanb/qemu/qemu-git/vl.c:1429
#10 main (argc=<value optimized out>, argv=<value optimized out>,
    envp=<value optimized out>) at /home/stefanb/qemu/qemu-git/vl.c:3148

I have previously seen another backtrace, but having tried this now 5 times, this one keeps on coming back.

This is one that I have seen previously:

Program received signal SIGSEGV, Segmentation fault.
0x0000000001181345 in ?? ()
(gdb) bt
#0  0x0000000001181345 in ?? ()
#1  0x0000000000564d58 in load_segment (selector1=<value optimized out>)
    at /home/stefanb/qemu/qemu-git/target-i386/op_helper.c:149
#2  helper_verw (selector1=<value optimized out>)
    at /home/stefanb/qemu/qemu-git/target-i386/op_helper.c:3411
 #3  0x0000000000000000 in ?? ()

I hope this helps...

Regards,
    Stefan




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