vlc segfault debug help please
 

Hi,
I have slackware64-current installed and up to date on two computers.
I had vlc-3.0.7 happily running on both until a few days ago, (several updates ago). Now one segfaults:
kernel: [137640.025456] vlc[15609]: segfault at 7e5a6 ip 000000000007e5a6 sp 00007ffcf64c7788 error 14 in vlc[400000+1000]

They both have installed:
OpenAL-1.19.1-x86_64-1alien.txz
SDL_sound-1.0.3-x86_64-1alien.txz
libxkbcommon-0.8.4-x86_64-1alien.txz
npapi-vlc-20190112-x86_64-1alien.txz
qt5-5.12.3-x86_64-1alien.txz
qt5-webkit-5.212.0_alpha2-x86_64-5alien.txz
qt5-webkit-5.9.1-x86_64-2alien.txz*
vlc-3.0.7-x86_64-1alien.txz

# ldd /usr/bin/vlc
linux-vdso.so.1 (0x00007ffe891b8000)
libvlc.so.5 => /usr/lib64/libvlc.so.5 (0x00007f6405116000)
libvlccore.so.9 => /usr/lib64/libvlccore.so.9 (0x00007f640500b000)
libidn.so.12 => /usr/lib64/libidn.so.12 (0x00007f6404dd7000)
libdbus-1.so.3 => /usr/lib64/libdbus-1.so.3 (0x00007f6404d84000)
libm.so.6 => /lib64/libm.so.6 (0x00007f6404c39000)
libpthread.so.0 => /lib64/libpthread.so.0 (0x00007f6404c18000)
libdl.so.2 => /lib64/libdl.so.2 (0x00007f6404c11000)
libc.so.6 => /lib64/libc.so.6 (0x00007f6404a2c000)
/lib64/ld-linux-x86-64.so.2 (0x00007f6405186000)

Please suggest how I can figure out what is different/wrong with the Slackware installation on the computer that segfaults?

Thanks in Advance

If you temporarily move ./config/vlc and let that regenerate, does that fix the segfault?

If not, try this? https://bbs.archlinux.org/viewtopic.php?id=151935

Does VLC segfault with all files, or just one particular type?

Maybe I should have said the /usr/bin/vlc --help segfaults

>If you temporarily move ./config/vlc and let that regenerate, does that fix the segfault?
When I move the folder away and re-run vlc the .config/vlc files do not get regenerated

> Does VLC segfault with all files, or just one particular type?
It segfaults on all files I have tried, no GUI displays

/usr/lib64/vlc/vlc-cache-gen --help runs but:
/usr/lib64/vlc/vlc-cache-gen /usr/lib64/vlc/plugins/ even segfaults!

moving /usr/lib64/vlc/plugins/ aside and re-installing vlc - no change

gdb vlc _ says, no symbols

I don't know if it will help but you have two versions of qt5-webkit installed and qt5-webkit-5.9.1-x86_64-2alien.txz is incompatible with qt5 5.12.x
So:
And then re-install the correct 'qt5-webkit' package (5.212_alpha2).

That will at least give you a non-broken qt5-webkit, however I doubt that it will fix VLC for you.

OK...will it segfault with cvlc?

Old qt5-webkit (qt5-webkit-5.9.1-x86_64-2alien) removed
and latest version of qt5-webkit installed again (qt5-webkit-5.212.0_alpha2-x86_64-5alien.txz)

vlc --help
and
cvlc --help
both still segfault :(

You could try these suggestions: https://wiki.archlinux.org/index.php...entation_fault
I.e. remove the plugins.dat file from the plugins directory, and then re-install the VLC package.

I get a segfault issue, too, when I play videos in VLC. VLC opens just fine and plays audio files, but playing videos makes it segfault.

# move vlc config file away to allow it to be regenerated
mv -v .config/vlc .config/oldvlc

# remove /usr/lib64/vlc
rm -fr /usr/lib64/vlc

# install all packages and regenerate plugin data
# installpkg OpenAL-1.19.1-x86_64-1alien.txz SDL_sound-1.0.3-x86_64-1alien.txz libxkbcommon-0.8.4-x86_64-1alien.txz npapi-vlc-20190112-x86_64-1alien.txz qt5-5.12.3-x86_64-1alien.txz qt5-webkit-5.212.0_alpha2-x86_64-5alien.txz vlc-3.0.7-x86_64-1alien.txz

Verifying package OpenAL-1.19.1-x86_64-1alien.txz.
Installing package OpenAL-1.19.1-x86_64-1alien.txz:

Executing install script for OpenAL-1.19.1-x86_64-1alien.txz.
Package OpenAL-1.19.1-x86_64-1alien.txz installed.

Verifying package SDL_sound-1.0.3-x86_64-1alien.txz.
Installing package SDL_sound-1.0.3-x86_64-1alien.txz:

Executing install script for SDL_sound-1.0.3-x86_64-1alien.txz.
Package SDL_sound-1.0.3-x86_64-1alien.txz installed.

Verifying package libxkbcommon-0.8.4-x86_64-1alien.txz.
Installing package libxkbcommon-0.8.4-x86_64-1alien.txz:

Executing install script for libxkbcommon-0.8.4-x86_64-1alien.txz.
Package libxkbcommon-0.8.4-x86_64-1alien.txz installed.

Verifying package npapi-vlc-20190112-x86_64-1alien.txz.
Installing package npapi-vlc-20190112-x86_64-1alien.txz:

Package npapi-vlc-20190112-x86_64-1alien.txz installed.

Verifying package qt5-5.12.3-x86_64-1alien.txz.
Installing package qt5-5.12.3-x86_64-1alien.txz:

Executing install script for qt5-5.12.3-x86_64-1alien.txz.
Package qt5-5.12.3-x86_64-1alien.txz installed.

Verifying package qt5-webkit-5.212.0_alpha2-x86_64-5alien.txz.
Installing package qt5-webkit-5.212.0_alpha2-x86_64-5alien.txz:

Executing install script for qt5-webkit-5.212.0_alpha2-x86_64-5alien.txz.
Package qt5-webkit-5.212.0_alpha2-x86_64-5alien.txz installed.

Verifying package vlc-3.0.7-x86_64-1alien.txz.
Installing package vlc-3.0.7-x86_64-1alien.txz:

Executing install script for vlc-3.0.7-x86_64-1alien.txz.
Generating VLC plugins cache data...
# /usr/lib64/vlc exit
Package vlc-3.0.7-x86_64-1alien.txz installed.

# rehash
# vlc --help
VLC media player 3.0.7 Vetinari (revision 3.0.7-0-g86cee31099)
Segmentation fault
# vlc
VLC media player 3.0.7 Vetinari (revision 3.0.7-0-g86cee31099)
Segmentation fault

# cvlc --help
VLC media player 3.0.7 Vetinari (revision 3.0.7-0-g86cee31099)
Segmentation fault
# cvlc
VLC media player 3.0.7 Vetinari (revision 3.0.7-0-g86cee31099)
Segmentation fault

# /usr/lib64/vlc/vlc-cache-gen /usr/lib64/vlc/plugins/
Segmentation fault

Humm, Maybe I should have tried this before.

cd /slackware64/l ( the directory containing all the latest slackware64-current l files )
installpkg *.txz ( reinstall all library packages )

vlc now works normally!!!

Thank you to those that thought about my problem.
My solution fixes the problem but does not give much of a clue to what the actual issue was which is a bit sad but never mind.
Maybe it will help someone else one day :)

Huh. Now I'm curious as to what you were missing. If you use slackpkg, do you do install-new from time to time?

Yes, when I do an update I always check to see if there are any new packages and I always install all l packages whether I think I need them or not.

Unfortunately I don't know of an easy way of determining what was missing, sadly.
Partly because I don't know exactly when vlc stopped working so even if I restored a few backups and looked for differences it would be unlikely that I would be able to figure out which changes caused the problem.

I actually get a crash report now:

Apart from posting the same comments in two threads (which is annoying to say the least) have you actually considered following the advice of the OP of this thread and tried to re-install all (inclusing potentially missing) packages?

I was missing SDL_sound.

Why didn't "slackpkg install-new" say SDL_sound was a new package? I had to run "slackpkg install ktown" instead.

thanks