Hi All,

I'm new to the list and may be it's a known issue. I have a set of servers with RHEL6 and dovecot-2.2.10-1_14.el6.x86_64 and another set of servers with RHEL7 and, now, with dovecot-2.2.36-3.el7.x86_64. Both sets write to the same NFS.
Since I updated RHEL7 servers (from 2.2.10-8.el7.x86_64) I've problems with index files when a RHEL7 dovecot service write to the filesystem of a user (the first log line corresponds to RHEL7 and the others to RHEL6):

Feb  5 09:33:05 listas3 dovecot: lda(user@domain): sieve: msgid=<007bxxxxxxx@uam.es>: stored mail into mailbox 'INBOX'
Feb  5 09:33:25 buzon1 dovecot: imap(user@domain): Error: Corrupted transaction log file /.../Maildir/dovecot.index.log seq 1610: Invalid transaction log size (28408 vs 28528): /.../Maildir/dovecot.index.log (sync_offset=28408)
Feb  5 09:33:25 buzon1 dovecot: imap(user@domain): Panic: file mail-index-sync-keywords.c: line 227 (keywords_update_records): assertion failed: (data_offset >= sizeof(struct mail_index_record))
Feb  5 09:33:25 buzon1 dovecot: imap(user@domain): Error: Raw backtrace: /usr/lib64/dovecot/libdovecot.so.0() [0x3713268b8a] -> /usr/lib64/dovecot/libdovecot.so.0() [0x3713268bf6] -> /usr/lib64/dovecot/libdovecot.so.0() [0x37132224aa] -> /usr/lib64/dovecot/libdovecot-storage.so.0(mail_index_sync_keywords+0x7fd) [0x3713aca43d] -> /usr/lib64/dovecot/libdovecot-storage.so.0(mail_index_sync_record+0xec) [0x3713acacac] -> /usr/lib64/dovecot/libdovecot-storage.so.0(mail_index_sync_map+0x234) [0x3713acbae4] -> /usr/lib64/dovecot/libdovecot-storage.so.0(mail_index_map+0x83) [0x3713abcce3] -> /usr/lib64/dovecot/libdovecot-storage.so.0(mail_index_refresh+0xe) [0x3713ab793e] -> /usr/lib64/dovecot/libdovecot-storage.so.0(maildir_sync_header_refresh+0x10) [0x3713a4e1e0] -> /usr/lib64/dovecot/libdovecot-storage.so.0() [0x3713a4e330] -> /usr/lib64/dovecot/libdovecot-storage.so.0() [0x3713a4f3d4] -> /usr/lib64/dovecot/libdovecot-storage.so.0() [0x3713a4f7b3] -> /usr/lib64/dovecot/libdovecot-storage.so.0(maildir_storage_sync_init+0xd9) [0x3713a4fa59] -> /usr/lib64/dovecot/libdovecot-storage.so.0(mailbox_sync_init+0x31) [0x3713a7d731] -> /usr/lib64/dovecot/libdovecot-storage.so.0(mailbox_sync+0x27) [0x3713a7e7b7] -> /usr/lib64/dovecot/libdovecot-storage.so.0(index_storage_get_status+0x62) [0x3713aa8fc2] -> /usr/lib64/dovecot/lib10_quota_plugin.so(+0xc3ec) [0x7fd272dfe3ec] -> /usr/lib64/dovecot/libdovecot-storage.so.0(mailbox_get_status+0x5c) [0x3713a7f4fc] -> dovecot/imap(imap_status_get+0x7a) [0x41dbea] -> dovecot/imap(cmd_status+0x179) [0x413059] -> dovecot/imap(command_exec+0x3d) [0x4170bd] -> dovecot/imap() [0x416180] -> dovecot/imap() [0x41627a] -> dovecot/imap(client_handle_input+0x11d) [0x4164ed] -> dovecot/imap(client_input+0x6f) [0x41685f] -> /usr/lib64/dovecot/libdovecot.so.0(io_loop_call_io+0x36) [0x3713278a56] -> /usr/lib64/dovecot/libdovecot.so.0(io_loop_handler_run+0xa7) [0x3713279b27] -> /usr/lib64/dovecot/libdovecot.so.0(io_loop_run+0x38) [0x37132789c8]
Feb  5 09:33:25 buzon1 dovecot: imap(user@domain): Fatal: master: service(imap): child 2057 killed with signal 6 (core dumped)
Feb  5 09:33:25 buzon4 dovecot: imap-login: Login: user=<user@domain>, method=PLAIN, rip=192.168.x.x, lip=150.x.x.x, mpid=3459, session=<ZUSAdiGBdwDAqAzY>
Feb  5 09:33:30 buzon4 dovecot: imap(user@domain): Panic: file mail-index-sync-keywords.c: line 227 (keywords_update_records): assertion failed: (data_offset >= sizeof(struct mail_index_record))
Feb  5 09:33:30 buzon4 dovecot: imap(user@domain): Error: Raw backtrace: /usr/lib64/dovecot/libdovecot.so.0() [0x3a88668b8a] -> /usr/lib64/dovecot/libdovecot.so.0() [0x3a88668bf6] -> /usr/lib64/dovecot/libdovecot.so.0() [0x3a886224aa] -> /usr/lib64/dovecot/libdovecot-storage.so.0(mail_index_sync_keywords+0x7fd) [0x3a88eca43d] -> /usr/lib64/dovecot/libdovecot-storage.so.0(mail_index_sync_record+0xec) [0x3a88ecacac] -> /usr/lib64/dovecot/libdovecot-storage.so.0(mail_index_sync_map+0x234) [0x3a88ecbae4] -> /usr/lib64/dovecot/libdovecot-storage.so.0(mail_index_map+0x83) [0x3a88ebcce3] -> /usr/lib64/dovecot/libdovecot-storage.so.0() [0x3a88eb797c] -> /usr/lib64/dovecot/libdovecot-storage.so.0() [0x3a88eb7d58] -> /usr/lib64/dovecot/libdovecot-storage.so.0(mail_index_open+0xf0) [0x3a88eb7ec0] -> /usr/lib64/dovecot/libdovecot-storage.so.0(index_storage_mailbox_open+0xad) [0x3a88eab2bd] -> /usr/lib64/dovecot/libdovecot-storage.so.0() [0x3a88e4d71a] -> /usr/lib64/dovecot/libdovecot-storage.so.0() [0x3a88e4d7ef] -> /usr/lib64/dovecot/libdovecot-storage.so.0() [0x3a88e7f694] -> /usr/lib64/dovecot/libdovecot-storage.so.0(mailbox_open+0xf) [0x3a88e7f84f] -> /usr/lib64/dovecot/libdovecot-storage.so.0(index_storage_get_status+0x4a) [0x3a88ea8faa] -> /usr/lib64/dovecot/lib10_quota_plugin.so(+0xc3ec) [0x7fbd599263ec] -> /usr/lib64/dovecot/libdovecot-storage.so.0(mailbox_get_status+0x5c) [0x3a88e7f4fc] -> dovecot/imap(imap_status_get+0x7a) [0x41dbea] -> dovecot/imap(cmd_status+0x179) [0x413059] -> dovecot/imap(command_exec+0x3d) [0x4170bd] -> dovecot/imap() [0x416180] -> dovecot/imap() [0x41627a] -> dovecot/imap(client_handle_input+0x11d) [0x4164ed] -> dovecot/imap(client_input+0x6f) [0x41685f] -> /usr/lib64/dovecot/libdovecot.so.0(io_loop_call_io+0x36) [0x3a88678a56] -> /usr/lib64/dovecot/libdovecot.so.0(io_loop_handler_run+0xa7) [0x3a88679b27] -> /usr/lib64/dovecot/libdovecot.so.0(io_loop_run+0x38) [0x3a886789c8]
Feb  5 09:33:30 buzon4 dovecot: imap(user@domain): Fatal: master: service(imap): child 3459 killed with signal 6 (core dumped)

Due to this issue when the user goes into his webmail, he can not see the inbox. If I delete dovecot.* files from the user maildir it gets solved, but usually it happens again, so it's not the solution.

Is it any solution for this issue or should I downgrade dovecot to 2.2.10-8.el7.x86_64 again?

Thanks and best regards