Dovecot is crashing occasionally for me. Today it crashed six times in quick succession, as I fired up a computer (Mac) I hadn't used in a while, and my mail application (Apple Mail) tried to synchronize many large mailboxes.

The log entries look like this:

Aug 26 10:26:15 computer dovecot: dovecot: child 23223 (imap) killed with signal 6 (core dumped) Aug 26 10:26:30 computer dovecot: IMAP(granitemon): Panic: file istream-raw-mbox.c: line 583 (istream_raw_mbox_get_body_size): assertion failed: (rstream->body_offset != (uoff_t)-1) Aug 26 10:26:30 computer dovecot: IMAP(granitemon): Raw backtrace: imap() [0x80f0e1e] -> imap() [0x80f0e82] -> imap() [0x80f0809] -> imap(istream_raw_mbox_get_body_size+0x407) [0x8092f47] -> imap(istream_raw_mbox_next+0x25) [0x8093025] -> imap(istream_raw_mbox_seek+0x1f3) [0x8093323] -> imap(mbox_file_seek+0x55) [0x8093745] -> imap() [0x8095852] -> imap() [0x8095c8d] -> imap(index_mail_set_seq+0x153) [0x80a35c3] -> imap() [0x8095fb9] -> imap(index_storage_search_next_nonblock+0x13b) [0x80a763b] -> imap(mailbox_search_next_nonblock+0x2a) [0x80b5c1a] -> imap(mailbox_search_next+0x28) [0x80b5c68] -> imap(imap_fetch_more+0x274) [0x806a4c4] -> imap() [0x8062665] -> imap() [0x806753f] -> imap(client_output+0xeb) [0x806862b] -> imap() [0x810007e] -> imap(io_loop_handler_run+0xd6) [0x80f9aa6] -> imap(io_loop_run+0x20) [0x80f8f20] -> imap(main+0x5b4) [0x8070f24] -> /lib/i686/cmov/libc.so.6(__libc_start_main+0xe6) [0xb75f3c76] -> imap() [0x80603a1] Aug 26 10:26:30 computer dovecot: dovecot: child 23228 (imap) killed with signal 6 (core dumped)

Here's the output of dovecot -n:

clements@computer:/home/granitemon$ sudo dovecot -n # 1.2.15: /etc/dovecot/dovecot.conf # OS: Linux 2.6.32-5-686 i686 Debian 6.0.2 log_timestamp: %Y-%m-%d %H:%M:%S login_dir: /var/run/dovecot/login login_executable: /usr/lib/dovecot/imap-login mail_privileged_group: mail mbox_write_locks: fcntl dotlock lda: postmaster_address: postmaster@brinckerhoff.org mail_plugins: sieve auth default: passdb: driver: pam userdb: driver: passwd

... this is the version associated with debian stable.

Finally, since I had coredumps enabled, I'm in a position to provide 'bt full', but it looks like my binaries are stripped, so I'm not getting source code line numbers.

granitemon@computer:~$ gdb /usr/lib/dovecot/imap ./core GNU gdb (GDB) 7.0.1-debian Copyright (C) 2009 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html> This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law. Type "show copying" and "show warranty" for details. This GDB was configured as "i486-linux-gnu". For bug reporting instructions, please see: <http://www.gnu.org/software/gdb/bugs/>... Reading symbols from /usr/lib/dovecot/imap...(no debugging symbols found)...done.

warning: Can't read pathname for load map: Input/output error. Reading symbols from /lib/i686/cmov/libdl.so.2...(no debugging symbols found)...done. Loaded symbols for /lib/i686/cmov/libdl.so.2 Reading symbols from /usr/lib/libldap_r-2.4.so.2...(no debugging symbols found)...done. Loaded symbols for /usr/lib/libldap_r-2.4.so.2 Reading symbols from /lib/i686/cmov/librt.so.1...(no debugging symbols found)...done. Loaded symbols for /lib/i686/cmov/librt.so.1 Reading symbols from /lib/i686/cmov/libc.so.6...(no debugging symbols found)...done. Loaded symbols for /lib/i686/cmov/libc.so.6 Reading symbols from /lib/ld-linux.so.2...(no debugging symbols found)...done. Loaded symbols for /lib/ld-linux.so.2 Reading symbols from /usr/lib/liblber-2.4.so.2...(no debugging symbols found)...done. Loaded symbols for /usr/lib/liblber-2.4.so.2 Reading symbols from /lib/i686/cmov/libresolv.so.2...(no debugging symbols found)...done. Loaded symbols for /lib/i686/cmov/libresolv.so.2 Reading symbols from /usr/lib/libsasl2.so.2...(no debugging symbols found)...done. Loaded symbols for /usr/lib/libsasl2.so.2 Reading symbols from /usr/lib/libgnutls.so.26...(no debugging symbols found)...done. Loaded symbols for /usr/lib/libgnutls.so.26 Reading symbols from /lib/i686/cmov/libpthread.so.0...(no debugging symbols found)...done. Loaded symbols for /lib/i686/cmov/libpthread.so.0 Reading symbols from /usr/lib/libtasn1.so.3...(no debugging symbols found)...done. Loaded symbols for /usr/lib/libtasn1.so.3 Reading symbols from /usr/lib/libz.so.1...(no debugging symbols found)...done. Loaded symbols for /usr/lib/libz.so.1 Reading symbols from /usr/lib/libgcrypt.so.11...(no debugging symbols found)...done. Loaded symbols for /usr/lib/libgcrypt.so.11 Reading symbols from /usr/lib/libgpg-error.so.0...(no debugging symbols found)...done. Loaded symbols for /usr/lib/libgpg-error.so.0 Reading symbols from /lib/i686/cmov/libnss_compat.so.2...(no debugging symbols found)...done. Loaded symbols for /lib/i686/cmov/libnss_compat.so.2 Reading symbols from /lib/i686/cmov/libnsl.so.1...(no debugging symbols found)...done. Loaded symbols for /lib/i686/cmov/libnsl.so.1 Reading symbols from /lib/i686/cmov/libnss_nis.so.2...(no debugging symbols found)...done. Loaded symbols for /lib/i686/cmov/libnss_nis.so.2 Reading symbols from /lib/i686/cmov/libnss_files.so.2...(no debugging symbols found)...done. Loaded symbols for /lib/i686/cmov/libnss_files.so.2 Reading symbols from /lib/libgcc_s.so.1...(no debugging symbols found)...done. Loaded symbols for /lib/libgcc_s.so.1 Core was generated by `imap'. Program terminated with signal 6, Aborted. #0 0xb7788424 in __kernel_vsyscall () (gdb) bt full #0 0xb7788424 in __kernel_vsyscall () No symbol table info available. #1 0xb7607751 in raise () from /lib/i686/cmov/libc.so.6 No symbol table info available. #2 0xb760ab82 in abort () from /lib/i686/cmov/libc.so.6 No symbol table info available. #3 0x080f0e2e in ?? () No symbol table info available. #4 0x080f0e82 in ?? () No symbol table info available. #5 0x080f0809 in i_panic () No symbol table info available. #6 0x08092f47 in istream_raw_mbox_get_body_size () No symbol table info available. #7 0x08093025 in istream_raw_mbox_next () No symbol table info available. #8 0x08093323 in istream_raw_mbox_seek () No symbol table info available. #9 0x08093745 in mbox_file_seek () No symbol table info available. #10 0x08095852 in ?? () No symbol table info available. #11 0x08095c8d in ?? () No symbol table info available. #12 0x080a35c3 in index_mail_set_seq () No symbol table info available. #13 0x08095fb9 in ?? () No symbol table info available. #14 0x080a763b in index_storage_search_next_nonblock () No symbol table info available. #15 0x080b5c1a in mailbox_search_next_nonblock () No symbol table info available. #16 0x080b5c68 in mailbox_search_next () No symbol table info available. #17 0x0806a4c4 in imap_fetch_more () No symbol table info available. #18 0x08062665 in ?? () No symbol table info available. #19 0x0806753f in ?? () No symbol table info available. #20 0x0806862b in client_output () No symbol table info available. #21 0x0810007e in ?? () No symbol table info available. #22 0x080f9aa6 in io_loop_handler_run () ---Type <return> to continue, or q <return> to quit--- No symbol table info available. #23 0x080f8f20 in io_loop_run () No symbol table info available. #24 0x08070f24 in main () No symbol table info available. (gdb) q

Does anyone have any suggestions, here?

Many thanks in advance; let me know if I can provide more information!

All the best,

John Clements