[Dovecot] 1.0-test25 with new cache file code

[Andrey Panin]

On 187, 07 05, 2004 at 10:14:22PM +0200, Juergen Daubert wrote:
> On Mon, Jul 05, 2004 at 01:47:28AM +0300, Timo Sirainen wrote:
> > http://dovecot.org/test/
> > 
> > Pretty much the only change since test24 is a redesign of how cache 
> > file writing works. Reading works as before - without locks.
> 
> Doesn't work for me here. 
> 
> Starting test25 with a mailbox having indexes gererated with 
> test24:
>  
>  Dovecot v1.0-test25 starting up
>  imap-login: Login: juergen [192.168.0.1]
>  child 26007 (imap) killed with signal 11
>  
> Ok, that's not the point, because after deleting all indexes 
> I can open small mboxes with around 50 email without problems. 
> 
> But, if I try to open bigger ones (>200 emails), the imap 
> process hangs with 100% cpu usage. This seems to happen after 
> 81920 bytes written to dovecot.index.cache, this is the value 
> I got for different mboxes ?

SImilar problem here, trying to open large maildir lead to
pop3 process eating 100% cpu.

strace doesn't show any activity except this:

alarm(30)                               = 0
sigreturn()                             = ? (mask now [RTMIN])
--- SIGALRM (Alarm clock) @ 0 (0) ---


Attaching gdb to the offending process gives me this info:

smtp:~/COPM# gdb  -p 22347
GNU gdb 6.0-debian
Copyright 2003 Free Software Foundation, Inc.
GDB is free software, covered by the GNU General Public License, and you are
welcome to change it and/or distribute copies of it under certain conditions.
Type "show copying" to see the conditions.
There is absolutely no warranty for GDB.  Type "show warranty" for details.
This GDB was configured as "i386-linux".
Attaching to process 22347
Reading symbols from /usr/lib/dovecot/pop3...(no debugging symbols found)...done.
Reading symbols from /lib/libdl.so.2...(no debugging symbols found)...done.
Loaded symbols for /lib/libdl.so.2
Reading symbols from /lib/libc.so.6...(no debugging symbols found)...done.
Loaded symbols for /lib/libc.so.6
Reading symbols from /lib/ld-linux.so.2...(no debugging symbols found)...done.
Loaded symbols for /lib/ld-linux.so.2
0x0806c04b in mail_cache_get_transaction ()
(gdb) where
#0  0x0806c04b in mail_cache_get_transaction ()
#1  0x0806c93f in mail_cache_add ()
#2  0x08065e4d in index_mail_cache_add ()
#3  0x0806635b in index_mail_get_size ()
#4  0x080664cb in index_mail_init_stream ()
#5  0x08059e94 in maildir_mailbox_list_next ()
#6  0x08066182 in index_mail_get_size ()
#7  0x08059e30 in maildir_mailbox_list_next ()
#8  0x08052464 in _start ()
#9  0x080c293c in ?? ()


I didn't dig deeper yet.

-- 
Andrey Panin		| Linux and UNIX system administrator
pazke at donpac.ru		| PGP key: wwwkeys.pgp.net
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