[Dovecot] Some crashes with 1.1.1

Timo Sirainen tss at iki.fi
Sun Jun 22 18:09:26 EEST 2008

On Jun 22, 2008, at 5:38 PM, Ralf Hildebrandt wrote:

> I'm getting some cra shes with 1.1.1, but even with these start  
> options:
> #!/bin/sh
> mkdir /var/core
> chmod 1777 /var/core
> echo /var/core/%p > /proc/sys/kernel/core_pattern
> ulimit -n 65535
> ulimit -c unlimited
> /usr/local/sbin/dovecot -F
> I'm not getting any corefiles - why? It definitely used to work :)

Also from login processes? One problem with it is that it calls  
setuid() after exec(), so kernel thinks it's a setuid-program and  
doesn't dump its core. But I don't know if changing core_pattern is  
supposed to change that behavior. The other problem is that it's  
chrooted, but I guess that doesn't matter then.

> Jun 22 00:05:53 postamt dovecot: imap-login: *** glibc detected ***  
> imap-login: free(): invalid pointer: 0x08cbd600 ***

Well, these really aren't good and there's a good chance that cores  
won't help finding out the cause. The best way would be to run via  

   login_executable = /usr/bin/valgrind /usr/local/libexec/dovecot/ 

I don't really have any good guesses as to why these could be  
happening, but could you post your dovecot -n output? Maybe there are  
some less common settings..
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