[Dovecot] sig11 with 1.0.beta3 on openbsd-i386

[David Gwynne]

i recently helped a friend of mine migrate from imap-uw using mboxes to
dovecot on top of Maildirs and came up against two issues. this is
quite embarrassing as ive been claiming dovecot is Solid As A Rock(tm)
and hasn't ever given me any issues.

1. if dovecot runs out of file descriptors it will loop forever trying
to open new logging pipes. the code in question is at line 624 of
src/master/login-process.c

2. we get a sig11 in the imap process. heres the bt:

dlg at mail dlg$ gdb -c imap.core /usr/local/libexec/dovecot/imap
GNU gdb 6.3
Copyright 2004 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-unknown-openbsd3.9"...
Core was generated by `imap'.
Program terminated with signal 11, Segmentation fault.
Reading symbols from /usr/local/lib/libiconv.so.4.0...done.
Loaded symbols for /usr/local/lib/libiconv.so.4.0
Reading symbols from /usr/lib/libc.so.39.0...done.
Loaded symbols for /usr/lib/libc.so.39.0
Reading symbols from /usr/libexec/ld.so...done.
Loaded symbols for /usr/libexec/ld.so
#0  0x1c04895a in mail_transaction_log_view_set (view=0x7f0b8300, min_file_seq=2, min_file_offset=208, max_file_seq=2, max_file_offset=208,
    type_mask=MAIL_TRANSACTION_APPEND) at mail-transaction-log-view.c:107
107             if (min_file_seq == view->log->tail->hdr.prev_file_seq &&
(gdb) bt
#0  0x1c04895a in mail_transaction_log_view_set (view=0x7f0b8300, min_file_seq=2, min_file_offset=208, max_file_seq=2, max_file_offset=208,
    type_mask=MAIL_TRANSACTION_APPEND) at mail-transaction-log-view.c:107
#1  0x1c044e91 in view_sync_set_log_view_range (view=0x7efaa800, type_mask=65532) at mail-index-view-sync.c:102
#2  0x1c045109 in mail_index_view_sync_begin (view=0x7efaa800, sync_mask=252, ctx_r=0x2) at mail-index-view-sync.c:216
#3  0x1c037e58 in index_mailbox_sync_init (box=0x82cf2840, flags=28, failed=8) at index-sync.c:151
#4  0x1c01bbb4 in maildir_storage_sync_init (box=0x82cf2840, flags=28) at maildir-sync.c:1343
#5  0x1c04c270 in mailbox_sync_init (box=0x2, flags=28) at mail-storage.c:375
#6  0x1c0167fa in imap_sync_init (client=0x7f0b8000, box=0x82cf2840, imap_flags=2, flags=28) at imap-sync.c:46
#7  0x1c016c80 in cmd_sync (cmd=0x7f0b8044, flags=28, imap_flags=0, tagline=0x3c0005cf "OK Search completed.") at imap-sync.c:231
#8  0x1c00ff9f in cmd_search (cmd=0x7f0b8044) at cmd-search.c:99
#9  0x1c010fb5 in cmd_uid (cmd=0x7f0b8044) at cmd-uid.c:19
#10 0x1c01186b in client_handle_input (cmd=0x7f0b8044) at client.c:364
#11 0x1c01199a in _client_input (context=0x7f0b8000) at client.c:415
#12 0x1c05d0a4 in io_loop_handler_run (ioloop=0x848ed220) at ioloop-kqueue.c:200
#13 0x1c05c701 in io_loop_run (ioloop=0x80e6a000) at ioloop.c:246
#14 0x1c0184f3 in main (argc=1, argv=0xcfbd5554, envp=0xcfbd555c) at main.c:238
(gdb) x view->log->tail->hdr.prev_file_seq
Cannot access memory at address 0x7f0bca
(gdb) x view->log->tail->hdr
Cannot access memory at address 0x7f0bbe
(gdb) x view->log->tail
0x7f0b82:       Cannot access memory at address 0x7f0b82
(gdb) x view->log
0x7f0b8181:     0x007efaa2

in both cases the problem was triggered with Apple Mail 2 as the client.
the user has maybe a dozen mailboxes, the largest of which is aoubt 10k
messages.

if you need any more detail, please dont hesitate to ask. i would like
this to work so i dont have to keep apologising.

dlg