Experimental Physics and
Industrial Control System

Michael Davidsaver via Tech-talk <tech-talk at aps.anl.gov> · Fri, 22 Sep 2023 08:41:02 -0700

On 9/22/23 01:19, Jörn Dreyer via Tech-talk wrote:

Hello,

I recently run into a problem with a client code that throws strange errors at
me during runtime:

CA client library tcp recieve thread terminating due to C++ exception

"epicsMutex::invalidMutex()"

"invalidMutex" indicates a coding error.  (NULL dereference, memory corruption,
use-after-free, ...)

Hopefully you can reproduce this error quickly, I would suggest running in GDB and
setting a breakpoint on the exception class ctor 'epicsMutex::invalidMutex::invalidMutex()'.
Then look for signs of corruption.

epicsMutex pthread_mutex_lock failed: error epicsMutexOSDLock
epicsThread: Unexpected C++ exception "epicsMutex::invalidMutex()" with type

"N10epicsMutex12invalidMutexE" in thread "CAC-TCP-send" at XXX

terminate called after throwing an instance of 'epicsMutex::invalidMutex()'
    what():  epicsMutex::invalidMutex()

After that my program crashes. Can anybody shed some light on that. It was
running all good until two days ago when this error started to pop up when a
connection to a PV is made.

Regards,

Jörn Dreyer

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System