dovecot - Jan 2014 - Panic: file buffer.c: line 307 (buffer_set_used_size): assertion failed: (used_size <= buf->alloc)

This is log from dovecot 2.2.10:

2014-01-11T09:55:14+01:00 server/a.b.c.d dovecot: imap(user at domain):
Error: Corrupted transaction log file
/pracmail/domain/user/mail/.sent-mail/dovecot.index.log seq 16777216:
log file shrank (868 < 6144) (sync_offset=6144)
2014-01-11T09:55:14+01:00 server/a.b.c.d dovecot: imap(user at domain):
Panic: file buffer.c: line 307 (buffer_set_used_size): assertion failed:
(used_size <= buf->alloc)
2014-01-11T09:55:14+01:00 server/a.b.c.d dovecot: imap(user at domain):
Error: Raw backtrace:
/usr/local/dovecot-2.2.10/lib/dovecot/libdovecot.so.0(+0x6c2fa)
[0x7f0704fa22fa] ->
/usr/local/dovecot-2.2.10/lib/dovecot/libdovecot.so.0(+0x6c366)
[0x7f0704fa2366] ->
/usr/local/dovecot-2.2.10/lib/dovecot/libdovecot.so.0(i_error+0)
[0x7f0704f5802f] ->
/usr/local/dovecot-2.2.10/lib/dovecot/libdovecot.so.0(+0x67489)
[0x7f0704f9d489] ->
/usr/local/dovecot-2.2.10/lib/dovecot/libdovecot-storage.so.0(mail_transaction_log_file_open+0x2c0)
[0x7f07052ed120] ->
/usr/local/dovecot-2.2.10/lib/dovecot/libdovecot-storage.so.0(mail_transaction_log_open+0xb8)
[0x7f07052e99b8] ->
/usr/local/dovecot-2.2.10/lib/dovecot/libdovecot-storage.so.0(+0xc1784)
[0x7f07052cf784] ->
/usr/local/dovecot-2.2.10/lib/dovecot/libdovecot-storage.so.0(mail_index_open+0xf0)
[0x7f07052cfac0] ->
/usr/local/dovecot-2.2.10/lib/dovecot/libdovecot-storage.so.0(index_storage_mailbox_open+0xac)
[0x7f07052c0fac] ->
/usr/local/dovecot-2.2.10/lib/dovecot/libdovecot-storage.so.0(+0x4d43a)
[0x7f070525b43a] ->
/usr/local/dovecot-2.2.10/lib/dovecot/libdovecot-storage.so.0(+0x4d50f)
[0x7f070525b50f] ->
/usr/local/dovecot-2.2.10/lib/dovecot/libdovecot-storage.so.0(+0x84054)
[0x7f0705292054] ->
/usr/local/dovecot-2.2.10/lib/dovecot/libdovecot-storage.so.0(mailbox_open+0xf)
[0x7f070529220f] ->
/usr/local/dovecot-2.2.10/lib/dovecot/libdovecot-storage.so.0(index_storage_get_status+0x4a)
[0x7f07052bfc2a] ->
/usr/local/dovecot/lib/dovecot/lib10_quota_plugin.so(+0xb8ac)
[0x7f0704d1c8ac] ->
/usr/local/dovecot-2.2.10/lib/dovecot/libdovecot-storage.so.0(mailbox_get_status+0x8c)
[0x7f0705291ebc] -> dovecot/imap(imap_status_get+0x7a) [0x42058a] ->
dovecot/imap(cmd_status+0x15d) [0x413a0d] ->
dovecot/imap(command_exec+0x3d) [0x418acd] -> dovecot/imap() [0x417b10]
-> dovecot/imap() [0x417c25] -> dovecot/imap(client_handle_input+0x125)
[0x4180b5] -> dovecot/imap(client_input+0x6f) [0x41892f] ->
/usr/local/dovecot-2.2.10/lib/dovecot/libdovecot.so.0(io_loop_call_io+0x36)
[0x7f0704fb2c66] ->
/usr/local/dovecot-2.2.10/lib/dovecot/libdovecot.so.0(io_loop_handler_run+0x95)
[0x7f0704fb3fd5] ->
/usr/local/dovecot-2.2.10/lib/dovecot/libdovecot.so.0(io_loop_run+0x38)
[0x7f0704fb2bd8] ->
/usr/local/dovecot-2.2.10/lib/dovecot/libdovecot.so.0(master_service_run+0x13)
[0x7f0704f5d483] -> dovecot/imap(main+0x2a7) [0x422807]
2014-01-11T09:55:14+01:00 server/a.b.c.d dovecot: imap(user at domain):
Fatal: master: service(imap): child 25125 killed with signal 6 (core dumped)
2014-01-11T09:55:15+01:00 server/a.b.c.d dovecot: imap(user at domain):
Error: Transaction log file
/pracmail/us.edu.pl/user/mail/.sent-mail/dovecot.index.log: marked corrupted

Unfortunately I'm not able to find core file although 'core dumped'
is
written to the log.

MU

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