GNU gdb (GDB) 7.4.1-debian
Copyright (C) 2012 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.
[New LWP 8142]

warning: Can't read pathname for load map: Input/output error.
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/i386-linux-gnu/i686/cmov/libthread_db.so.1".
Core was generated by `dovecot/imap'.
Program terminated with signal 6, Aborted.
#0  0xb7751424 in __kernel_vsyscall ()
(gdb) bt full
#0  0xb7751424 in __kernel_vsyscall ()
No symbol table info available.
#1  0xb741c941 in raise () from /lib/i386-linux-gnu/i686/cmov/libc.so.6
No symbol table info available.
#2  0xb741fd72 in abort () from /lib/i386-linux-gnu/i686/cmov/libc.so.6
No symbol table info available.
#3  0xb75c5b09 in ?? () from /usr/lib/dovecot/libdovecot.so.0
No symbol table info available.
#4  0xb75c5b61 in ?? () from /usr/lib/dovecot/libdovecot.so.0
No symbol table info available.
#5  0xb75786f9 in i_panic () from /usr/lib/dovecot/libdovecot.so.0
No symbol table info available.
#6  0xb73c2aca in ?? () from /usr/lib/dovecot/modules/lib20_fts_plugin.so
No symbol table info available.
#7  0xb73c2b9e in fts_search_lookup () from /usr/lib/dovecot/modules/lib20_fts_plugin.so
No symbol table info available.
#8  0xb73c4a19 in ?? () from /usr/lib/dovecot/modules/lib20_fts_plugin.so
No symbol table info available.
#9  0xb76aea7f in mailbox_search_init () from /usr/lib/dovecot/libdovecot-storage.so.0
No symbol table info available.
#10 0xb778e304 in imap_search_start ()
No symbol table info available.
#11 0xb778147e in cmd_search ()
No symbol table info available.
#12 0xb7787cca in command_exec ()
No symbol table info available.
#13 0xb7786b36 in ?? ()
No symbol table info available.
#14 0xb7786c79 in ?? ()
No symbol table info available.
#15 0xb7786ead in client_handle_input ()
No symbol table info available.
#16 0xb77872b1 in client_input ()
No symbol table info available.
#17 0xb75d86a4 in io_loop_call_io () from /usr/lib/dovecot/libdovecot.so.0
No symbol table info available.
#18 0xb75d972e in io_loop_handler_run () from /usr/lib/dovecot/libdovecot.so.0
No symbol table info available.
#19 0xb75d8138 in io_loop_run () from /usr/lib/dovecot/libdovecot.so.0
No symbol table info available.
#20 0xb757e4ae in master_service_run () from /usr/lib/dovecot/libdovecot.so.0
No symbol table info available.
#21 0xb7779d08 in main ()
No symbol table info available.