[vdr] vdr with nexus-s rev 2.1 crashes with ttxtsubs and osdteletext when zapping

Udo Richter udo_richter at gmx.de
Wed Jul 6 03:40:50 CEST 2005

Magnus Andersson wrote:
> I think you are right "TS continuity errors" it can explain why hardware
> encoder is more sensetive than vdr-xine. 

Note that the "TS continuity error" message is just above the crash
position and has probably not been triggered at all.

> #0  0xb7d443d1 in kill () from /lib/libc.so.6
> #1  0xb7f24091 in pthread_kill () from /lib/libpthread.so.0
> #2  0xb7f2446b in raise () from /lib/libpthread.so.0
> #3  0xb7d44164 in raise () from /lib/libc.so.6
> #4  0xb7d4563d in abort () from /lib/libc.so.6
> #5  0xb7eeed67 in __cxa_call_unexpected ()
>    from /usr/lib/gcc-lib/i386-pc-linux-gnu/3.3.5-20050130/libstdc++.so.5
> #6  0xb7eeeda4 in std::terminate ()
>    from /usr/lib/gcc-lib/i386-pc-linux-gnu/3.3.5-20050130/libstdc++.so.5
> #7  0xb7eef2c8 in __cxa_pure_virtual ()
>    from /usr/lib/gcc-lib/i386-pc-linux-gnu/3.3.5-20050130/libstdc++.so.5

VDR was killed by purpose, and it looks like a pure virtual function
call caused an unhandled exception.
Pure virtual function calls often occur if a virtual function is called
while the destructor of the object is running or after it has been
running. With threading, such things easily happen. (but I remember such
things just dropping a message...)

> #8  0x080cfa07 in cRingBuffer::EnableGet (this=0x855c070) at ringbuffer.c:77
> #9  0xb7b8a701 in cRingTxtFrames::Signal ()
>    from ./PLUGINS/lib/libvdr-osdteletext.so.1.3.25
> #10 0xb7b89de3 in cTxtReceiver::~cTxtReceiver ()
>    from ./PLUGINS/lib/libvdr-osdteletext.so.1.3.25

osdteletext is just detaching from the video stream, waiting for the
receive processing thread to terminate. No clue why this causes
problems. All involved virtual functions are still valid.

In both cases, the crash involves destructors, so its probably caused by
 the receive process that ended. Maybe some part of the old channel
receive process doesnt end as it should, and sends data into the wild
after the processing chain is already gone. Dont know.



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