dovecot - Sep 2009 - dovecot-auth stops responding

Running dovecot 1.2.4(imap only) on AIX out of inetd. I accept  
passwords(PAM for auth) and kerberos tickets. Occasionally we see  
dovecot-auth stop responding. I just kill it off and another process  
is spawned which works fine. It doesn't look like it is hitting any  
ulimits(11MB for memory). I issued a kill -11 and ran it through the  
debugger. Here is what it says:

  dbx dovecot-auth core
Type 'help' for help.
[using memory image in core]
reading symbolic information ...

Segmentation fault in __fd_poll at 0x900000000117634 ($t1)
0x900000000117634 (__fd_poll+0x98) e8410028          ld   r2,0x28(r1)
(dbx) where
__fd_poll(??, ??, ??) at 0x900000000117634
ioloop-poll.poll(__listptr = 0x00000001104dd330, __nfds = 145,  
__timeout = 1051), line 121 in "poll.h"
io_loop_handler_run(ioloop = 0x000000011001bfb0), line 157 in "ioloop- 
poll.c"
io_loop_run(ioloop = 0x000000011001bfb0), line 335 in "ioloop.c"
main(argc = 1, argv = 0x0ffffffffffffad8), line 347 in "main.c"


Here are my ulimits:

  ulimit -a
time(seconds)        unlimited
file(blocks)         2097151
data(kbytes)         1048576
stack(kbytes)        65536
memory(kbytes)       65536
coredump(blocks)     2097151
nofiles(descriptors) 32768


Any help would be appreciated.
Thanks,
Jonathan
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On Wed, 2009-09-09 at 14:12 -0400, Jonathan Siegle
wrote:
> Running dovecot 1.2.4(imap only) on AIX out of inetd. I accept  
> passwords(PAM for auth) and kerberos tickets. Occasionally we see  
> dovecot-auth stop responding. I just kill it off and another process  
> is spawned which works fine. 
If you use PAM then I guess you should have auth worker processes too?
So one dovecot-auth and 1+ "dovecot-auth -w"? Does it help if you kill
off the worker processes? What if you kill imap-login processes instead?
> Segmentation fault in __fd_poll at 0x900000000117634 ($t1)
> 0x900000000117634 (__fd_poll+0x98) e8410028          ld   r2,0x28(r1)
> (dbx) where
> __fd_poll(??, ??, ??) at 0x900000000117634
> ioloop-poll.poll(__listptr = 0x00000001104dd330, __nfds = 145,  
This just shows that it was waiting for something to do. Does AIX have
something like strace or truss? Use it to see what's happening when a
request comes.

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