Crash in _dbus_connection_block_pending_call

[John (J5) Palmieri]

I need a better backtrace with debugging info.
_dbus_connection_block_pending_call doesn't call
_dbus_list_get_first_link directly.  I need to know the exact line it is
crashing on in _dbus_connection_block_pending_call.  Please run NM in
GDB with the debugging packages installed for dbus, glibc and NM.  Lets
see if that gives us enough information.

On Thu, 2006-06-08 at 18:28 +0200, Timo Hoenig wrote:
> Hi,
> 
> There is a crash in libdbus-1 once in a while.  It looks very racy as it
> only happens sometimes.
> 
> Tracking down this issue a little further showed that the fix for block
> on pending calls [1] is causing the crashes.  When reverting the patch
> everything works fine and NetworkManager (NM) does not crash.
> 
> Here's a excerpt of the NM trace [2] when crashing:
> 
> 41 Jun  8 13:32:49 linux-qo35 NetworkManager: No symbol table info available.
> 42 Jun  8 13:32:49 linux-qo35 NetworkManager: #4  <signal handler called>
> 43 Jun  8 13:32:49 linux-qo35 NetworkManager: No symbol table info available.
> 44 Jun  8 13:32:49 linux-qo35 NetworkManager: #5  0xb7e5e9a7 in _dbus_list_get_first_link () from /usr/lib/libdbus-1.so.2
> 45 Jun  8 13:32:49 linux-qo35 NetworkManager: No symbol table info available.
> 46 Jun  8 13:32:49 linux-qo35 NetworkManager: #6  0xb7e48e0a in _dbus_connection_block_pending_call () from /usr/lib/libdbus-1.so.2
> 47 Jun  8 13:32:49 linux-qo35 NetworkManager: No symbol table info available.
> 48 Jun  8 13:32:49 linux-qo35 NetworkManager: #7  0xb7e55f5d in dbus_pending_call_block () from /usr/lib/libdbus-1.so.2
> 49 Jun  8 13:32:49 linux-qo35 NetworkManager: No symbol table info available.
> 50 Jun  8 13:32:49 linux-qo35 NetworkManager: #8  0xb7e49289 in dbus_connection_send_with_reply_and_block () from /usr/lib/libdbus-1.so.2
> 51 Jun  8 13:32:49 linux-qo35 NetworkManager: No symbol table info available.
> 52 Jun  8 13:32:49 linux-qo35 NetworkManager: #9  0x0807d16a in nm_dhcp_manager_get_state_for_device ()
> 53 Jun  8 13:32:49 linux-qo35 NetworkManager: No symbol table info available.
> 
> Any ideas?
> 
> Thanks,
> 
>    Timo
> 
> [1] Fix for block on poll issue
>     cvs diff -u -r 1.115 -r 1.116 dbus/dbus-connection.c
> 
> [2] NM log when crashing
>     http://nouse.net/misc/nm-trace
> 
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-- 
John (J5) Palmieri <johnp at redhat.com>