Re: x11/kde-applications/kdenlive keep crashing and is unusable

On Fri Apr 26, 2019 at 05:25:22PM +0200, Solene Rapenne wrote:
> I'm trying to get kdenlive to work, each time I try to load a video sample in
> the editing tracks, kdenlive crashs and I can't even find where is the
> coredump.
>
> I have no idea why this is happening. I did a ktrace -d but this procuded a 1
> GB file and I don't know what to look.
>
> I bumped a lot my user limits, here is ulimit -a output:
>
> time(cpu-seconds) unlimited
> file(blocks) unlimited
> coredump(blocks) unlimited
> data(kbytes) 3620864
> stack(kbytes) 8192
> lockedmem(kbytes) 3072000
> memory(kbytes) 3072000
> nofiles(descriptors) 4096
> processes 512
>
>
> When I start kdenlive with egdb and reroduce the issue, I can get a backtrace
> as the following:
>
> (gdb) bt
> #0 thrkill () at -:3
> #1 0x000006d485da1ffe in _libc_abort () at /usr/src/lib/libc/stdlib/abort.c:51
> #2 0x000006d485dc4ac2 in _libc_pthread_mutex_unlock (mutexp=<optimized out>) at /usr/src/lib/libc/thread/rthread_mutex.c:265
> #3 0x000006d4aa9d43d6 in producer_set_up_video (self=<optimized out>, frame=0x6d4b7666000) at producer_avformat.c:2350
> #4 producer_get_frame (producer=<optimized out>, frame=<optimized out>, index=<optimized out>) at producer_avformat.c:2987
> #5 0x000006d4c414fcca in producer_get_frame (service=0x6d46c52ab00, frame=0x6d408a12390, index=<optimized out>) at mlt_producer.c:643
> #6 0x000006d4c414eb85 in mlt_service_get_frame (self=0x6d46c52ab00, frame=0x6d408a12390, index=<optimized out>) at mlt_service.c:593
> #7 0x000006d41c00eb0c in Mlt::Service::get_frame (this=<optimized out>, index=0) at MltService.cpp:115
> #8 0x000006d1e7966d77 in ProjectClip::doExtractImage() ()
> #9 0x000006d1e75eda39 in non-virtual thunk to QtConcurrent::RunFunctionTask<void>::run() ()
> #10 0x000006d4cfb4eca7 in QThreadPoolThread::run() () from /usr/local/lib/libQt5Core.so.2.2
> #11 0x000006d4cfb57820 in QThreadPrivate::start(void*) () from /usr/local/lib/libQt5Core.so.2.2
> #12 0x000006d4d869f021 in _rthread_start (v=<optimized out>) at /usr/src/lib/librthread/rthread.c:96
> #13 0x000006d485e201ab in __tfork_thread () at /usr/src/lib/libc/arch/amd64/sys/tfork_thread.S:72
> #14 0x0000000000000000 in ?? ()
>

Reported upstream: https://github.com/mltframework/mlt/issues/444