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[Qemu-devel] R: qemu-nbd segmentation fault

From: Mario DE CHENNO
Subject: [Qemu-devel] R: qemu-nbd segmentation fault
Date: Wed, 18 Sep 2013 15:35:12 +0200

This time crashed just issuing a mount command:

Starting program: /vmstore/vmtools/qemu-nbd-from1.6.0 /vmstore/playground/archivioweb.img
[Thread debugging using libthread_db enabled]
[New Thread 0x7ffff55e3700 (LWP 7626)]
[New Thread 0x7ffff47dd700 (LWP 7645)]
[New Thread 0x7ffff3fdc700 (LWP 7646)]
[New Thread 0x7ffff37db700 (LWP 7647)]

Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 0x7ffff37db700 (LWP 7647)]
0x00007ffff7717249 in ?? () from /usr/lib64/libglib-2.0.so.0
(gdb) bt
#0  0x00007ffff7717249 in ?? () from /usr/lib64/libglib-2.0.so.0
#1  0x00007ffff771759c in ?? () from /usr/lib64/libglib-2.0.so.0
#2  0x00007ffff7718958 in g_slice_free1 () from /usr/lib64/libglib-2.0.so.0
#3  0x0000555555591c2d in aio_worker (arg=0x555555c2f6c0) at block/raw-posix.c:776
#4  0x00005555555da094 in worker_thread (opaque=0x555555c31a40) at thread-pool.c:109
#5  0x00007ffff6c2ed6b in start_thread () from /lib64/libpthread.so.0
#6  0x00007ffff6966abd in clone () from /lib64/libc.so.6

See you again

-----Messaggio originale-----
Da: Stefan Hajnoczi [mailto:address@hidden]
Inviato: mer 18/09/2013 14.50
Cc: address@hidden
Oggetto: Re: [Qemu-devel] qemu-nbd segmentation fault

On Tue, Sep 17, 2013 at 02:53:51PM +0200, ing. Mario De Chenno wrote:
> I cannot use qemu-nbd to write files to a qcow2 disk image. It always exit
> after a while with a segmentation fault.

Hi Mario,
Thanks for providing the strace.  Is it possible for you to post a

The backtrace shows where exactly the segfault occurs.  Try this:

  $ gdb --args path/to/qemu-nbd test.img

When the qemu-nbd process crashes you will be at the gdb prompt and can
print the backtrace:

  (gdb) bt

Please post the gdb output.


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