[Devmon] Daemon stalls with devmon 3.1b1 and hobbit/xymon 4.2.0-dfsg10

[Glenn A. <at...@ut...>]

We are having an issue with devmon 3.1b1 and hobbit/xymon 4.2.0-dfsg10 
on an Ubuntu 8.04 machine.  After a while (as long as 6 days, as short 
as 36 hours) it looks like it stalls waiting on for hobbit/xymon.

output from "devmon -f -vv":
[09-05-13@16:43:32] Getting device status from hobbit at localhost:1984
Can't use an undefined value as a HASH reference at
/opt/devmon-0.3.1-beta1/modules/dm_snmp.pm line 405, <$__ANONIO__> line
52616.
[09-05-13@17:25:44] Shutting down  (we shut it down at this point)

strace on the master:
select(0, NULL, NULL, NULL, {0, 1000})  = 0 (Timeout)
read(12, "", 4096)                      = 0
select(0, NULL, NULL, NULL, {0, 1000})  = 0 (Timeout)
read(12, "", 4096)                      = 0
select(0, NULL, NULL, NULL, {0, 1000})  = 0 (Timeout)
read(12, "", 4096)                      = 0

strace on one of the children:
--- SIGALRM (Alarm clock) @ 0 (0) ---
sigreturn()                             = ? (mask now [])
rt_sigprocmask(SIG_BLOCK, [ALRM], NULL, 8) = 0
rt_sigprocmask(SIG_UNBLOCK, [ALRM], NULL, 8) = 0
rt_sigprocmask(SIG_BLOCK, [ALRM], [], 8) = 0
rt_sigaction(SIGALRM, {SIG_DFL}, {0x80b4ad0, [], 0}, 8) = 0
rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
kill(29920, SIG_0)                      = 0
rt_sigprocmask(SIG_BLOCK, [ALRM], [], 8) = 0
rt_sigaction(SIGALRM, {SIG_DFL}, {SIG_DFL}, 8) = 0
rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
rt_sigprocmask(SIG_BLOCK, [ALRM], [], 8) = 0
rt_sigaction(SIGALRM, {0x80b4ad0, [], 0}, {SIG_DFL}, 8) = 0
rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
alarm(15)                               = 0
read(16, 0x8983d20, 4096)               = ? ERESTARTSYS (To be restarted)

Any suggestions for fixes or further troubleshooting?

Thanks,
-- 
Glenn Attwood
Senior Network Administrator, IITS
University of Toronto Scarborough
416-287-7364