Bug#685524: After upgrading to 4:4.8.2+dfsg-1 kwin segfaults on startup

[Arto Jantunen <viiru@debian.org>]

Lisandro Damián Nicanor Pérez Meyer <lisandro@debian.org> writes:

> Control: tag -1 unreproducible moreinfo
> thanks
>
> Hi Arto!
>
> On Tue 21 Aug 2012 12:49:57 Arto Jantunen escribió:
>> Package: qt4-x11
>> Version: 4:4.8.2+dfsg-1
>> Severity: grave
>> 
>> Starting KDE with qt4 version 4:4.8.2+dfsg-1 installed causes kwin to
>> segfault on startup somewhere in libpthread, with 4:4.8.2-2+b1 everything
>> works as expected.
>
> Just for the record: which video card are you using? Are the drivers free or 
> non-free?

The video card is an older Intel controller, free driver of course:

VGA compatible controller: Intel Corporation Mobile 945GM/GMS,
943/940GML Express Integrated Graphics Controller (rev 03)

>> I'll see if I can generate a proper backtrace..
>
> Please try to, as this is quite strange. I have added two patches to Qt but 
> they should not mess with kwin AFAIU.

Here is the backtrace:

#0  __memcpy_ssse3 () at ../sysdeps/x86_64/multiarch/memcpy-ssse3.S:495
No locals.
#1  0x00007ffff41e60bb in ?? () from /usr/lib/x86_64-linux-gnu/libQtScript.so.4
No symbol table info available.
#2  0x00007ffff41fb7ec in ?? () from /usr/lib/x86_64-linux-gnu/libQtScript.so.4
No symbol table info available.
#3  0x00007ffff41f7ca3 in ?? () from /usr/lib/x86_64-linux-gnu/libQtScript.so.4
No symbol table info available.
#4  0x00007ffff4244748 in ?? () from /usr/lib/x86_64-linux-gnu/libQtScript.so.4
No symbol table info available.
#5  0x00007ffff4244dfc in ?? () from /usr/lib/x86_64-linux-gnu/libQtScript.so.4
No symbol table info available.
#6  0x00007ffff42e5390 in ?? () from /usr/lib/x86_64-linux-gnu/libQtScript.so.4
No symbol table info available.
#7  0x00007ffff42e6386 in QScriptEngine::QScriptEngine() ()
   from /usr/lib/x86_64-linux-gnu/libQtScript.so.4
No symbol table info available.
#8  0x00007ffff7b6babd in ?? ()
   from /usr/lib/kde4/libkdeinit/libkdeinit4_kwin.so
No symbol table info available.
#9  0x00007ffff7afaf15 in kdemain ()
   from /usr/lib/kde4/libkdeinit/libkdeinit4_kwin.so
No symbol table info available.
#10 0x00007ffff7730ead 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=0x7fffffffe458)
    at libc-start.c:228
        result = <optimized out>
        unwind_buf = {cancel_jmp_buf = {{jmp_buf = {0, -8713010014218070022, 
                4196168, 140737488348256, 0, 0, 8713010015146629114, 
                8712993480219842554}, mask_was_saved = 0}}, priv = {pad = {
              0x0, 0x0, 0x400870, 0x7fffffffe468}, data = {prev = 0x0, 
              cleanup = 0x0, canceltype = 4196464}}}
        not_first_call = <optimized out>
#11 0x0000000000400771 in _start ()
No symbol table info available.

Is this related to a different gcc version or different flags used when
compiling the current packages? 

-- 
Arto Jantunen