[Dovecot] mailbox count folders issues

[Nikita Koshikov]

> I guess it's just exponentially increasing the buffer size then until it
> reaches mail_process_size.
> 
> > I recompile dovecot binaries with debug symbols, but seemed that gdb backtrace is broken.
> 
> Yeah, it is. Hmm. Since the core isn't working, can you attach gdb to
> imap process while it's still running? So something like:
> 
>  - open the account so imap process starts
>  - gdb -p <imap process pid>
>  - gdb command: c
>  - cause imap to crash -> gdb should stop
>  - gdb command: bt full
> 

Today, I have updated to version 1.2.7 and I was able to get gdb-backtrace with it. This is clean installation without any patches applied.

Error-log:
Nov 18 09:55:37 IMAP(alice at domain.com): Panic: data stack: Out of memory when allocating 268435472 bytes
Nov 18 09:55:37 IMAP(alice at domain.com): Error: Raw backtrace: imap [0x80d2381] -> imap [0x80d23f2] -> imap [0x80d1d59] -> imap [0x80d0b2d] -> imap [0x80d0fa7] -> imap [0x80db928] -> imap [0x80cfeda] -> imap(buffer_write+0xd2) [0x80d03d2] -> imap(buffer_append+0x26) [0x80d04f6] -> imap(mail_transaction_log_append+0x61c) [0x80b54cc] -> imap [0x80aa029] -> imap(mail_index_sync_commit+0xa5) [0x80ad525] -> /usr/lib/dovecot/imap/lib20_virtual_plugin.so [0xb7ea8bc6] -> /usr/lib/dovecot/imap/lib20_virtual_plugin.so(virtual_storage_sync_init+0x71c) [0xb7eab6ac] -> imap(mailbox_sync+0x35) [0x8097595] -> imap(cmd_select_full+0x3d8) [0x8062fb8] -> imap(cmd_select+0x19) [0x80636f9] -> imap [0x806597c] -> imap [0x8065a23] -> imap(client_handle_input+0x2d) [0x8065b7d] -> imap(client_input+0x5f) [0x80664bf] -> imap(io_loop_handler_run+0xe0) [0x80da4e0] -> imap(io_loop_run+0x20) [0x80d9980] -> imap(main+0x5dc) [0x806ee4c] -> /lib/libc.so.6(__libc_start_main+0xe5) [0xb7ef6725] -> imap [0x805e281]
Nov 18 09:55:37 dovecot: Error: child 9173 (imap) killed with signal 6 (core dumped)

Gdb-backtrace is attached.
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