[Xcb] Bug#657538: libxcb1: breaks alsamixer

[Julien Cristau]

On Thu, Jan 26, 2012 at 23:14:52 +0100, Cyril Brulebois wrote:

> Mario 'BitKoenig' Holbe <Mario.Holbe at TU-Ilmenau.DE> (26/01/2012):
> > Package: libxcb1                         
> > Version: 1.8-1
> > Severity: critical
> > Justification: makes unrelated software on the system break
> > 
> > Hello,
> > 
> > since libxcb1 upgraded to 1.8-1 alsamixer segfaults on startup.
> > Downgrading libxcb1 to 1.7-4 fixes this.
> > The system is a typical workstation with all the GNOME-bloat (and hence
> > also pulseaudio) installed.
> > 
> > root at darkside:~# COLUMNS=72 dpkg -l libxcb1 | grep ^i
> > ii  libxcb1        1.7-4          X C Binding
> > root at darkside:~# echo q | alsamixer
> > Segmentation fault (core dumped)
> 
> Please get us more info about that…
> 
Core was generated by `alsamixer'.
Program terminated with signal 11, Segmentation fault.
#0  0x00007f96c1c34fd0 in snd_mixer_class_unregister ()
   from /usr/lib/x86_64-linux-gnu/libasound.so.2
(gdb) where
#0  0x00007f96c1c34fd0 in snd_mixer_class_unregister ()
   from /usr/lib/x86_64-linux-gnu/libasound.so.2
#1  0x00007f96c1c350cd in snd_mixer_close ()
   from /usr/lib/x86_64-linux-gnu/libasound.so.2
#2  0x0000000000409a0a in ?? ()
#3  0x00007f96bf6fccb6 in xcb_disconnect (c=0x25fb8d0)
    at ../../src/xcb_conn.c:307
#4  0x00007f96c02ddfbc in pa_client_conf_from_x11 ()
   from /usr/lib/x86_64-linux-gnu/libpulsecommon-1.1.so
#5  0x00007f96c07149cf in pa_context_new_with_proplist ()
   from /usr/lib/x86_64-linux-gnu/libpulse.so.0
#6  0x00007f96bcc9c8e9 in pulse_new ()
   from /usr/lib/x86_64-linux-gnu/alsa-lib/libasound_module_ctl_pulse.so
#7  0x00007f96bcc9c0e0 in _snd_ctl_pulse_open ()
   from /usr/lib/x86_64-linux-gnu/alsa-lib/libasound_module_ctl_pulse.so
#8  0x00007f96c1c2b0a8 in ?? () from /usr/lib/x86_64-linux-gnu/libasound.so.2
#9  0x00007f96c1c299db in snd_hctl_open ()
   from /usr/lib/x86_64-linux-gnu/libasound.so.2
#10 0x00007f96c1c349cd in snd_mixer_attach ()
   from /usr/lib/x86_64-linux-gnu/libasound.so.2
#11 0x00007f96c1c35bf6 in snd_mixer_selem_register ()
   from /usr/lib/x86_64-linux-gnu/libasound.so.2
#12 0x000000000040913c in ?? ()
#13 0x00000000004046fe in ?? ()
#14 0x00007f96c11e3ead in __libc_start_main (main=<optimized out>, 
    argc=<optimized out>, ubp_av=<optimized out>, init=<optimized out>, 
    fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7fffabc3f7e8)
    at libc-start.c:228

Cheers,
Julien
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