[Help-gnutls] Assertion failure advice

David Given dg at cowlark.com
Sun Apr 15 00:50:27 CEST 2007

My program, which uses gnutls, is very occasionally crashing for no apparent
reason. After much effort (running it in a screen session for two weeks...)
I've finally managed to get some tracing:

spey: ath.c:184: _gcry_ath_mutex_lock: Assertion `*lock == ((ath_mutex_t) 0)'

This appears to be an assertion failure inside gnutls. I can tell from the
rest of the tracing that it's happening inside a call to gnutls_handshake().

Does anyone know what this might be signifying? It doesn't seem to be my
fault, but I have had very little experience driving the GNUTLS API and I
could easily be getting something wrong. It looks like a mutex failure, but
while my program is multithreaded, I'm using a unique session object per
socket, so I wouldn't have thought this would apply.

The actual code is in the Socket::makesecure() function here:


...line 272. Any advice gratefully appreciated.

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