Error: sieve: fail2ban: line 23: read(<lmtp DATA local>) failed: Seeking past EOF by 2364 bytes

Hi,


dovecot is crashing for me while doing sieve processing for messages 
received via lmtp. This is reproducible, and seems to hit every message 
which runs a particular sieve script.  Any thoughts or help would be 
appreciated! The error is:


      Error: sieve: fail2ban: line 23: read(<lmtp DATA local>) failed: 
Seeking past EOF by 2364 bytes


Note: the number of bytes is always one of: 2169, 2272, 2259, 2364. I 
have many of these.


I cannot see how the "Seeking past EOF" error can be caused by a bug in 
my sieve script. But please let me know if it can!



Background: I have (and have had for many years) a complex set of sieve 
scripts for controlling my incoming email. They have worked fine for all 
that time. However, recently (ish), processing which uses a particular 
script is crashing dovecot. The actual log extract is below. The sieve 
script line 23, mentioned in the error report, is a large "if anyof (" 
statement containing many clauses like:


         body :raw :regex "country:[[:space:]]+KR",


I can provide the full sieve script if required.


This is what I see in the dovecot log (note: I reformatted the backtrace 
to make it easier to read. I also changed all my server names):

Mar 29 03:03:52 SERVER dovecot-HOST: lmtp(4008073): Connect from local
Mar 29 03:03:52 SERVER dovecot-HOST: 
lmtp(cobb)<4008073><PiAQHoiIyGmJKD0Ay7SJiA>: Error: sieve: fail2ban: 
line 23: read(<lmtp DATA local>) failed: Seeking past EOF by 2364 bytes
Mar 29 03:03:52 SERVER dovecot-HOST: 
lmtp(cobb)<4008073><PiAQHoiIyGmJKD0Ay7SJiA>: Error: sieve: Execution of 
script 'auto:personal/.dovecot' was aborted due to temporary failure 
(user logfile /home/cobb/.dovecot.sieve.log may reveal additional details)
Mar 29 03:03:52 SERVER dovecot-HOST: 
lmtp(cobb)<4008073><PiAQHoiIyGmJKD0Ay7SJiA>: Panic: file 
istream-concat.c: line 27 (i_stream_concat_close): assertion failed: 
(cstream->cur_input == cstream->input[cstream->cur_idx])
Mar 29 03:03:52 SERVER dovecot-HOST: 
lmtp(cobb)<4008073><PiAQHoiIyGmJKD0Ay7SJiA>: Error: Raw backtrace:

#1 [unw_get_proc_name() failed: -10]

-> #2 [unw_get_proc_name() failed: -10]

-> #3 i_panic[0x7f41540655e6]

-> #4 [unw_get_proc_name() failed: -10]

-> #5 io_stream_unref[0x7f415413c120]

-> #6 i_stream_unref[0x7f4154145c30]

-> #7 index_storage_mailbox_close[0x7f4154383e70]

-> #8 mailbox_close[0x7f41542fd9e0]

-> #9 mailbox_free[0x7f4154302ab0]

-> #10 lmtp_local_deinit[0x55dfa9c4e320]

-> #11 client_state_reset[0x55dfa9c4f0d0]

-> #12 smtp_server_transaction_free[0x7f4154091880]

-> #13 smtp_server_connection_reset_state[0x7f4154093c90]

-> #14 smtp_server_command_call_hooks[0x7f415408be60]

-> #15 smtp_server_command_send_replies[0x7f4154090050]

-> #16 [unw_get_proc_name() failed: -10]

-> #17 [unw_get_proc_name() failed: -10]

-> #18 io_loop_call_io[0x7f4154151710]

-> #19 io_loop_handler_run_internal[0x7f41541534b0]

-> #20 io_loop_handler_run[0x7f4154153640]

-> #21 io_loop_run[0x7f4154153820]

-> #22 master_service_run[0x7f41540a6330]

-> #23 main[0x55dfa9c4a260]

-> #24 __libc_start_call_main[0x7f4153e32c30]

-> #25 __libc_start_main_alias_2[0x7f4153e32ce0]

-> #26 _start[0x55dfa9c4a470]

Mar 29 03:03:54 SERVER dovecot-HOST: 
lmtp(cobb)<4008073><PiAQHoiIyGmJKD0Ay7SJiA>: Fatal: master: 
service(lmtp): child 4008073 killed with signal 6 (core dumped)
Mar 29 03:04:05 SERVER postfix/lmtp[4008072]: 005083DC75D: 
to=<MYADDRESS@MYDOMAIN>, orig_to=<ANOTHER@ANOTHERDOMAIN>, 
relay=SERVERNAME[private/dovecot-lmtp], delay=1740676, 
delays=1740674/0.25/0.04/1.5, dsn=4.4.2, status=deferred (lost 
connection with SERVERNAME[private/dovecot-lmtp] while sending end of 
data -- message may be sent more than once)


The only message in .dovecot.sieve.log is:


fail2ban: line 23: error: failed to read input message: internal error 
occurred: refer to server log for more information. [2026-04-01 18:54:13].


Thanks in advance for any thoughts!


Graham

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