Panic: file-lock.c

[Ricardo Branco]

Today we had an unclean shutdown of our NFS filler and have had lots of issues with mailboxes being re-synced, mostly 
all the issues are now resolved but we are seeing the following appear for one user on our system.

Dec 19 16:15:29 imap(xxx.xxx at xxx.com)(xxx.xxx at xxx.com): Panic: file file-lock.c: line 287: unreached
Dec 19 16:15:29 imap(xxx.xxx at xxx.com)(xxx.xxx at xxx.com): Error: Raw backtrace: 
/usr/local/lib/dovecot/libdovecot.so.0(+0x9ceda) [0x7f2b45209eda] -> /usr/local/lib/dovecot/libdovecot.so.0(+0x9cf46) 
[0x7f2b45209f46] -> /usr/local/lib/dovecot/libdovecot.so.0(i_error+0) [0x7f2b4519cc5f] -> 
/usr/local/lib/dovecot/libdovecot.so.0(+0xa150a) [0x7f2b4520e50a] -> 
/usr/local/lib/dovecot/libdovecot.so.0(file_wait_lock_error+0x39) [0x7f2b4520e789] -> 
/usr/local/lib/dovecot/libdovecot.so.0(file_try_lock_error+0x13) [0x7f2b4520e873] -> 
/usr/local/lib/dovecot/libdovecot.so.0(file_create_locked+0x29e) [0x7f2b4520b7de] -> 
/usr/local/lib/dovecot/libdovecot-storage.so.0(mailbox_lock_file_create+0x125) [0x7f2b454dc345] -> 
/usr/local/lib/dovecot/libdovecot-storage.so.0(+0xba1fd) [0x7f2b4554f1fd] -> 
/usr/local/lib/dovecot/libdovecot-storage.so.0(index_mailbox_vsize_update_appends+0x63) [0x7f2b4554f363] -> 
/usr/local/lib/dovecot/libdovecot-storage.so.0(index_mailbox_sync_deinit+0x197) [0x7f2b4555c327] -> 
/usr/local/lib/dovecot/lib20_fts_plugin.so(+0xebd1) [0x7f2b4416bbd1] -> 
/usr/local/lib/dovecot/libdovecot-storage.so.0(mailbox_sync_deinit+0x30) [0x7f2b454de750] -> 
/usr/local/lib/dovecot/libdovecot-storage.so.0(mailbox_sync+0x3b) [0x7f2b454e0b4b] -> 
/usr/local/lib/dovecot/libdovecot-storage.so.0(index_storage_get_status+0x62) [0x7f2b45558402] -> 
/usr/local/lib/dovecot/lib20_fts_plugin.so(+0xfbf4) [0x7f2b4416cbf4] -> 
/usr/local/lib/dovecot/lib01_acl_plugin.so(+0xe564) [0x7f2b445aa564] -> 
/usr/local/lib/dovecot/libdovecot-storage.so.0(mailbox_get_status+0x8c) [0x7f2b454e05cc] -> 
dovecot/imap(imap_status_get+0x7a) [0x42222a] -> dovecot/imap(cmd_status+0x15d) [0x41514d] -> 
dovecot/imap(command_exec+0x5d) [0x41a7fd] -> dovecot/imap() [0x417fb0] -> dovecot/imap() [0x418046] -> 
dovecot/imap(client_handle_input+0x165) [0x418385] -> dovecot/imap(client_input+0x6f) [0x41882f] -> 
/usr/local/lib/dovecot/libdovecot.so.0(io_loop_call_io+0x61) [0x7f2b4521db71] -> 
/usr/local/lib/dovecot/libdovecot.so.0(io_loop_handler_run_internal+0xbf) [0x7f2b4521f75f] -> 
/usr/local/lib/dovecot/libdovecot.so.0(io_loop_handler_run+0x3c) [0x7f2b4521dc2c]
Dec 19 16:15:29 imap(xxx.xxx at xxx.com)(xxx.xxx at xxx.com): Fatal: master: service(imap): child 30620 killed with signal 6 
(core dumps disabled)