[Dovecot] "Out of memory" error in 1.0alpha3

[Timo Sirainen]

On Fri, 2005-10-14 at 00:47 -0400, Sergey A. Lipnevich wrote:
> Hi All,
> 
> I have Dovecot 1.0 Alpha3 running on x86_64 Linux 2.6 multi-CPU box 
> using Maildir folders. Moving messages from one folder to another in 
> Thunderbird 1.0.7, regardless of their size (usually small), produced 
> error 83, "Out of memory", when both of these parameters were unset 
> (default): mail_read_mmaped, mmap_disable. The log line before the error 
> was pool_system_malloc(): Out of memory.

This is a bug in Dovecot. It looks like it happens only with 64bit
systems. Would you mind getting a gdb backtrace from that, it would help
in fixing it? Works basically like:

 - Open the mailbox in thunderbird
 - gdb attach pid-of-the-imap-process-that's-going-to-move-the-messages
 - Give "cont" command
 - Move the messages and wait for crash
 - Give "bt" command
 - mail the reply to me

> I initially changed mmap_disable to "yes", the error stopped, but it 
> still wasn't moving messages reliably. I then set MM parameters more 
> aggressively: mail_read_mmaped = yes, mmap_disable = no (and the third 
> of the series, mmap_no_write, is left unset). The error stopped popping 
> up, and the moving works speedily.
> Maybe the default for mail_read_mmaped should be "yes?"

That probably just goes around the buggy code path..

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