[ATrpms-users] vlc crashes

[Jeffrey J. Kosowsky]

Axel Thimm wrote at about 14:03:42 +0200 on Wednesday, January 9, 2008:
 > On Wed, Jan 09, 2008 at 01:26:50AM -0500, Jeffrey J. Kosowsky wrote:
 > > When I run vlc on some HD streams (piping getatsc to vlc), I get a
 > > crash most but not all the time (using the exact same command).
 > 
 > Errors that are not deterministic usually point to non-intialized
 > variables or to overwriting past their boundaries. Depending on what
 > the value of the var (randomly) was or whether the overwritten memory
 > was critical or not you get different results.
 > 
 > > *** glibc detected *** vlc: double free or corruption (!prev): 0x0991f808 ***
 > 
 > This means that there is a bug in the program trying to free twice the
 > same memory. E.g. there is something wrong with the memory
 > bookkeeping. In older distros or if one removed the glibc safety
 > features (I think one can do so by environment vars) the error is not
 > fatal and you may be lucky and not notice any effect. But as these
 > bugs can be used for security exploits Fedora (since FC5?) by default
 > kills such bad behaving programs.
 > 
 > E.g. the issue is a code issue - glibc detects it and kills the code.
 > 
 > > ======= Backtrace: =========
 > > /lib/libc.so.6[0xc8dac1]
 > > /lib/libc.so.6(cfree+0x90)[0xc910f0]
 > > vlc[0x809ea5b]
 > > /usr/lib/vlc/stream_out/libstream_out_transcode_plugin.so[0x5fcb24]
 > > vlc(sout_InputSendBuffer+0x78)[0x8097f28]
 > > vlc[0x80d1b3a]
 > > vlc[0x80d5b0e]
 > > vlc[0x80fd694]
 > > vlc[0x80fe628]
 > > vlc[0x8079ddd]
 > > vlc[0x807b3ad]
 > > /lib/libpthread.so.0[0xdb650b]
 > > /lib/libc.so.6(clone+0x5e)[0xcf7b2e]
 > 
 > If you install the debuginfo package to vlc and glibc then you would
 > get the names of the routines and maybe one would be able to guess
 > what vlc was doing at that time (e.g. which sublibrary it is using etc.)
 > -- 
 > Axel.Thimm at ATrpms.net
 > 

Any words of wisdom on the other (non-critical) "errors" mentioned in
the log file:

 >  > 1. libdvdread: Can't stat - No such file or directory
 >  >   (but I do have libdvdread-0.9.7-3.fc8.i386.rpm)
 >  > 
 >  > 2. libdvdnav: vm: faild to open/read the DVD
 >  > 	 (but I was using an input stream on stdin and never
 >  > 	 referenced a DVD though the format is mpeg2)
 >  >
 >  > 3. libdvbpsi error (PSI decoder): TS discontinuity (received 2, expected 0) for PID 0
 >  > 
 >  > 4. No accelerated IMDCT transform found

Basically, I just want to know what the errors mean and what I need to
do to fix them or at least get rid of them.

Thanks!