Cyrus 2.1.9 on Solaris 8 - occasional deadlocks on individual users

[Lawrence Greenfield]

   Date: Tue, 10 Sep 2002 12:46:43 -0400
   From: Steve Barber <steveb at cme.nist.gov>

   Truss on the users' imapds shows this :

   fcntl(7, F_SETLKW, 0xFFBEF3B4)  (sleeping...)

You can figure out what this is by using lsof or /usr/proc/bin/pfiles.

I usually do a /usr/proc/bin/pfiles on a process that's hanging to
find out who has the lock, then finding out what that process is
doing (usually waiting for network I/O or another lock).

This of course shouldn't happen. Well, maybe it can happen for up to
1/2 an hour if the process holding the lock is stuck in a select(),
but even then we should probably be more clever.

[...]
   In the mean time, any suggestions for how to narrow the problem down?

gdb backtraces on the process that is holding the lock might be
helpful.

Larry