I re-open this bug as apport marks newer crashes duplicate against this bug and
there was no actual fix for this bug yet.
The crash happened for me with version 0.4.3-0ubuntu1 (see bug 809781). I
attached lightdm.log to my bug which shows:
[+27.77s] WARNING: Greeter did not quit, sending kill signal
[+27.77s] DEBUG: Sending signal 15 to process 1557
[+28.04s] DEBUG: Process 1557 closed communication channel
[+28.04s] DEBUG: Process 1557 exited with return value 0
[+28.04s] DEBUG: Greeter quit
[+28.77s] WARNING: Greeter did not quit, sending kill signal
[+28.77s] WARNING: invalid unclassed pointer in cast to `Session'
[+28.77s] WARNING: invalid unclassed pointer in cast to `ChildProcess'
So the greeter is getting killed twice, even though the first kill was
successful.
In src/greeter.c I see:
greeter->priv->quit_timeout = g_timeout_add (GREETER_QUIT_TIMEOUT,
quit_greeter_cb, greeter);
which means quit_greeter_cb will be called periodically, until quit_greeter_cb
returns FALSE. However, quit_greeter_cb has a hard coded return TRUE, so the
killing never stops. When the greeter was killed successfully, the next kill
will result in a crash.
In my opinion, quit_greeter_cb should return FALSE, at least when killing the
greeter was successful.
** Changed in: lightdm (Ubuntu)
Status: Invalid => Confirmed
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https://bugs.launchpad.net/bugs/798716
Title:
lightdm crashed with SIGSEGV in g_main_context_dispatch()
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