Signalled to death by 13 - CONTINUED

[Nikola Milutinovic]

Derrick J Brashear wrote:

> On Wed, 29 Dec 2004, Nikola Milutinovic wrote:
>
>> I've turned off SPA (defaulting to NTLM), but the "problem" persists. 
>> It looks like Outlook Express is closing the connection irregularely, 
>> there is that line in the log:
>
> []
>
>> What troubles me is that the connection is closed almost instantly as 
>> the user logs in. My connection via Mozilla usually ends with "idle 
>> for too long" and normal exit of  imapd.
>
>
> attach with a syscall tracer (i don't know if tru64 has an 
> strace/truss/ktrace equivalent) and see what it's doing.


Couldn't just attach - I would have to pinpoint the process before it 
dies and it dies quickly. What I did was I ran entire Cyrus IMAP under a 
trace.

I located one such process that dies. I'm not going to display the 
entire trace, that would be too much. I'll just describe what's being done.

1. normal fork from the master and "execve()"
2. load dynamic libraries via "mmap()": sasl2, db-4.2, ssl, crypto, c
3. read "imapd.conf"
4. initialize DBs in /var/opt/Cyrus-IMAP4-2.2.10/config/db
5. load SASL plugins: plain, sasldb, cram-md5, digest-md5, gssapiv2, 
anonymous, login, ntlm, otp, sql.
6. open mailboxes.db and other local things
7. reverse DNS resolve the client (IP - Hostname)
8. writes to a PID file and dies

This is the last few entries in the trace:

[28598]: getsockname (0, 0x11fffeb68, 0x11fffead8=128) = 0 [ , <2/INET, 
143, 192.168.61.11>, 16 ]
[28598]: obreak (0x14006e000) = 0
[28598]: getpid () = 28598
[28598]: open ("/var/opt/Cyrus-IMAP4-2.2.10/config/proc/28598", 
O_RDWR|O_CREAT|O_TRUNC, 666) = 10
[28598]: lseek (10, 0, SEEK_SET) = 0
[28598]: fstat (10, 0x11fffe120) = 0 [ , <2657.414753.94343 -rw------- 1 
cyrus mail 0 1104908996,1104908996,1104908996> ]
[28598]: ioctl (10, 0x40067408<Out,TIOCGETP,6>, 11fffe0f8) = -1, Errno 
25 (Not a typewriter)
[28598]: write (10, 0x40064808, 35) = 35
+ 79 2e 6f 63 2e 76 65 2e 31 30 32 30 6f 66 6e 69 <00000000> 
info0201.ev.co.y
+ 30 31 2e 31 36 2e 38 36 31 2e 32 39 31 5b 20 75 <00000010> u 
[192.168.61.10
+                                        0a 5d 39 <00000020> 9].

After this there is nothing and the master reports the child died with 
SIGPIPE.

Nix.
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