Hello all, Sorry for the cross-posting. I'm running a stock sarge machine with the 32bit 2.6.8 kernel on a AMD64 3200+ machine. I'm using some unstable and demudi packages for media applications, in particular pure-data (PD). Problem I'm having is that PD crashes when I try and use v4l2. Actually there is no fault, but PD hangs. I traced it down to the use of pthread_join() which is where the code hangs. (I've been doing a backtrace after manually killing the application) I tried upgrading my libc6 2.3.2.ds1-22.d to 2.3.5 and am still getting the same crash. Here are a couple examples of traces: (gdb) bt #0 0xffffe410 in __kernel_vsyscall () #1 0x40128f18 in pthread_join () from /lib/tls/i686/cmov/libpthread.so.0 #2 0x44bd97bd in videoV4L::stopTransfer () from /usr/lib/pd/extra/Gem.pd_linux #3 0x44bd504c in pix_videoNEW::stopRendering () from /usr/lib/pd/extra/Gem.pd_linux #4 0x44b0111e in GemBase::gem_startstopMess () from /usr/lib/pd/extra/Gem.pd_linux #5 0x44b01382 in GemBase::gem_MessCallback () from /usr/lib/pd/extra/Gem.pd_linux #6 0x0809ba47 in pd_typedmess () #7 0x00000000 in ?? () (gdb) bt #0 0xffffe410 in __kernel_vsyscall () #1 0x40128f18 in pthread_join () from /lib/tls/i686/cmov/libpthread.so.0 #2 0x42a86440 in pdp_sdl_setup () from /usr/lib/pd/extra/pdp.pd_linux Gem.pd_linux & pdp.pd_linux are libs loaded into PD. I have recompiled Gem.pd_linux from source and it still crashes. Possible issues: PD is from the demudi (stable) package Gem is compiled from source PDP is from the demudi (stable) package The crash still happens on libc6 2.3.2, and 2.3.5 If this crash is caused because the packages were compiled against a different version of libc6 I tried to compile PD from source as well. So with Gem compiled from source and PD compiled from source (both against libc6 2.3.5) I still get the crash. No other libs are noted in the backtrace, could one of the other libs actually be the cause? Gem links with libmpeg3,libmpeg,aviplay,ffmpeg etc.. But I don't see any calls to these in the trace... So to recap, PD and Gem are recompiled from source against my libc6 2.3.5 (unstable) pthread_join() still crashes, only these two packages are in the trace... So what is causing the crash? Any suggestions, especially for debugging beyond the gdb backtrace, would be greatly appreciated. I've read of some people have issues with AMD64 and pthreads, but those seemed to get resolved by upgrading to libc6 2.3.5. So what should I do to try and solve this? Are there known bugs with my configuration and pthreads? I'm doing an art installation on this machine in just weeks so I really need to get it working or I'll have to resort to dropping linux and going to an OS X machine. :( Thanks all for your time and attention. B.
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