dovecot - Jan 2014 - Fatal: master: service(imap): child n killed with signal 11 (core dumped) - in mail_cache_header_fields_read

This is log from dovecot 2.2.10:

2014-01-13T15:34:39+01:00 server/a.b.c.d dovecot: imap(user at domain): Fatal:
master: service(imap): child 6290 killed with signal 11 (core dumped)

(gdb) bt full
#0  0x00007fe78683aba5 in mail_cache_header_fields_read ()
   from /usr/local/dovecot-2.2.10/lib/dovecot/libdovecot-storage.so.0
No symbol table info available.
#1  0x00007fe78683890a in mail_cache_open_and_verify ()
   from /usr/local/dovecot-2.2.10/lib/dovecot/libdovecot-storage.so.0
No symbol table info available.
#2  0x00007fe78683c339 in mail_cache_field_exists ()
   from /usr/local/dovecot-2.2.10/lib/dovecot/libdovecot-storage.so.0
No symbol table info available.
#3  0x00007fe78683c459 in mail_cache_lookup_field ()
   from /usr/local/dovecot-2.2.10/lib/dovecot/libdovecot-storage.so.0
No symbol table info available.
#4  0x00007fe786821949 in index_mail_cache_lookup_field ()
   from /usr/local/dovecot-2.2.10/lib/dovecot/libdovecot-storage.so.0
No symbol table info available.
#5  0x00007fe7868222d6 in index_mail_update_access_parts ()
   from /usr/local/dovecot-2.2.10/lib/dovecot/libdovecot-storage.so.0
No symbol table info available.
#6  0x00007fe786822676 in index_mail_set_seq ()
   from /usr/local/dovecot-2.2.10/lib/dovecot/libdovecot-storage.so.0
No symbol table info available.
#7  0x00007fe786829f51 in search_more ()
   from /usr/local/dovecot-2.2.10/lib/dovecot/libdovecot-storage.so.0
---Type <return> to continue, or q <return> to quit---
No symbol table info available.
#8  0x00007fe78682a778 in index_storage_search_next_nonblock ()
   from /usr/local/dovecot-2.2.10/lib/dovecot/libdovecot-storage.so.0
No symbol table info available.
#9  0x00007fe786800257 in mailbox_search_next_nonblock ()
   from /usr/local/dovecot-2.2.10/lib/dovecot/libdovecot-storage.so.0
No symbol table info available.
#10 0x00007fe7868002b6 in mailbox_search_next ()
   from /usr/local/dovecot-2.2.10/lib/dovecot/libdovecot-storage.so.0
No symbol table info available.
#11 0x000000000041b637 in imap_fetch_more_int ()
No symbol table info available.
#12 0x000000000041b871 in imap_fetch_more ()
No symbol table info available.
#13 0x000000000040d8ae in cmd_fetch ()
No symbol table info available.
#14 0x0000000000418acd in command_exec ()
No symbol table info available.
#15 0x0000000000417b10 in client_command_input ()
No symbol table info available.
#16 0x0000000000417c25 in client_command_input ()
No symbol table info available.
#17 0x00000000004180b5 in client_handle_input ()
---Type <return> to continue, or q <return> to quit---
No symbol table info available.
#18 0x000000000041892f in client_input ()
No symbol table info available.
#19 0x00007fe786522c66 in io_loop_call_io ()
   from /usr/local/dovecot-2.2.10/lib/dovecot/libdovecot.so.0
No symbol table info available.
#20 0x00007fe786523fd5 in io_loop_handler_run ()
   from /usr/local/dovecot-2.2.10/lib/dovecot/libdovecot.so.0
No symbol table info available.
#21 0x00007fe786522bd8 in io_loop_run ()
   from /usr/local/dovecot-2.2.10/lib/dovecot/libdovecot.so.0
No symbol table info available.
#22 0x00007fe7864cd483 in master_service_run ()
   from /usr/local/dovecot-2.2.10/lib/dovecot/libdovecot.so.0
No symbol table info available.
#23 0x0000000000422807 in main ()
No symbol table info available.
(gdb)


MU


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