mISDN_send: error -12 strikes again

System: Debian Stable, kernel 2.6.32-5-amd64
lcr: 129a76d1411166176db646138b35e8f5ed9907a2 from Feb 20 2011
mISDNuser and mISDN around the same time. mISDN is slightly older (some
commits broke compilation on older kernels).

I've verified that the current chan_misdn didn't change anything
concerning locking compared to the old version above.

Yesterday we had the message "mISDN_send: error -12" filling
/var/log/kern.log. Restarting asterisk "fixed" it.

When this happened "lcradmin state" and "core show channels" in asterisk
had different ideas on the channels in use: lcradmin showed three busy
channels while asterisk showed only one.

Andreas: Any idea how to instrument the code to debug locking issues?
Do you think that the same asterisk lock will be called twice by
chan_misdn or is this a complicated locking issue involving several
locks inside asterisk? My idea for the first case would be to replace
all calls to ast_lock/unlock with macros that log line number and time
to syslog.

I'm not sure we're going to see this soon again, though.

Ralf
-- 
Ralf Schlatterbeck             email: [email protected]