Slow controls SDF locks up
The slow controls SDF locks up at times. Attaching a debugger to the a locked up process showed the following backtrace:
Command name abbreviations are allowed if unambiguous. (gdb) bt #0 __lll_lock_wait () at ../sysdeps/unix/sysv/linux/x86_64/lowlevellock.S:103 #1 0x00007fb0aec917d1 in __GI___pthread_mutex_lock (mutex=0x55be10296190) at ../nptl/pthread_mutex_lock.c:115 #2 0x00007fb0aecefdfa in epicsMutexOsdLock () from /usr/lib/x86_64-linux-gnu/libCom.so.3.15.5 #3 0x00007fb0aece83ec in epicsMutex::lock() () from /usr/lib/x86_64-linux-gnu/libCom.so.3.15.5 #4 0x00007fb0aed69f06 in ca_clear_subscription () from /usr/lib/x86_64-linux-gnu/libca.so.3.15.5 #5 0x000055be08712a40 in syncCAConnections (disconnected_count=0x0) at /usr/share/advligorts/src/src/epics/seq/main.c:2799 #6 0x000055be08714bc2 in main (argc=2, argv=0x7ffecc5f9368) at /usr/share/advligorts/src/src/epics/seq/main.c:3467 (gdb) frame 5