Bug#883615: Acknowledgement ([CRITICAL] Stretch p-u 9.3 breaks NVidia driver and X.org)

[Julien Aubin]

2017-12-07 5:43 GMT+01:00 Julien Aubin <julien.aubin at gmail.com>:

>
> 2017-12-06 21:50 GMT+01:00 Aurelien Jarno <aurelien at aurel32.net>:
>
>> On 2017-12-06 19:39, Julien Aubin wrote:
>> > Weird... this time I re-upgraded libc6 and things work fine... looks
>> like
>> > something wrong went during the install. And I cannot reproduce the
>> issue
>> > anymore... :'( WTF ???
>>
>> Hmm, a bug has been introduced in libc6 version 2.24-11+deb9u2, which in
>> some conditions leave the /etc/ld.so.nohwcap file instead of removing it
>> just after the upgrade (see bug#883394). One of the condition is to have
>> libc6-i686 installed (while it can be safely removed), which seems to be
>> your case.
>>
>> I consider this bug harmless as it should not deactivate anything now
>> that the default libc is already i686 optimized. Also I don't see how it
>> could trigger the issue you described. Anyway better be safe than sorry,
>> could you please try to create this file with "touch /etc/ld.so.nohwcap"
>> as root and see if it makes the issue to reappear? Once the test is done
>> you can then remove it.
>>
>> Thanks,
>> Aurelien
>>
>
>
> Bingo ! It was exactly this !
>
> If I re-create the file for example it crashes glxgears. When I remove it
> glxgears works fine.
>
> With GDB, the stack trace for when I run glxgears :
>
> 0  0x00007ffff6b311a4 in pthread_mutex_lock (mutex=0x7ffff604e8c0) at
> forward.c:192
> #1  0x00007ffff5de1308 in __glDispatchNewVendorID () from
> /usr/lib/x86_64-linux-gnu/libGLdispatch.so.0
> #2  0x00007ffff60793c2 in ?? () from /usr/lib/x86_64-linux-gnu/libGLX.so.0
>
> #3  0x00007ffff607a1ac in ?? () from /usr/lib/x86_64-linux-gnu/libGLX.so.0
>
> #4  0x00007ffff6073170 in glXChooseVisual () from
> /usr/lib/x86_64-linux-gnu/libGLX.so.0
> #5  0x000055555555779f in ?? ()
> #6  0x0000555555555ae7 in ?? ()
> #7  0x00007ffff6a5c2e1 in __libc_start_main (main=0x555555555970, argc=1,
> argv=0x7fffffffe638, init=<optimized out>,
>    fini=<optimized out>, rtld_fini=<optimized out>,
> stack_end=0x7fffffffe628) at ../csu/libc-start.c:291
> #8  0x000055555555646a in ?? ()
>
>
>
To be clear it looks like this file also affects libc6-amd64 behaviour...

>
>> --
>> Aurelien Jarno                          GPG: 4096R/1DDD8C9B
>> aurelien at aurel32.net                 http://www.aurel32.net
>>
>
>
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