Panic-Error (ctx->nested_parts_count > 0)

[Andreas Piper]

Hello,

on my dovecot-replicator-backend I see lots of panic-messages "assertion 
failed: (ctx->nested_parts_count > 0)", produced from a single user. I 
assume that this is correlated with 
https://github.com/dovecot/core/commit/a668d767a710ca18ab6e7177d8e8be22a6b024fb

How can I identify the incorrect formatted message in the user's 
mailbox? I want to remove it, as the error-processes drive up the 
backend's load incredibly.

Will a fixed dovecot-package be out soon?

Any help is appreciated.

Best regards,
Andreas

My system-data:
# 2.3.11.3 (502c39af9): /etc/dovecot/dovecot.conf
# Pigeonhole version 0.5.11 (6c69c917)
# OS: Linux 4.15.0-122-generic x86_64 Ubuntu 18.04.5 LTS

An example error-message:

Nov 04 08:04:25 vhrz311 dovecot[6163]: 
imap(xxx at staff.uni-marburg.de)<63176><ad/jlkKzSs2sGQEp>: Panic: file 
message-parser.c: line 174 (message_part_finish): assertion failed: 
(ctx->nested_parts_count > 0)
Nov 04 08:04:25 vhrz311 dovecot[6163]: 
imap(xxx at staff.uni-marburg.de)<63173><ORvjlkKzRs2sGQEp>: Fatal: master: 
service(imap): child 63173 killed with signal 6 (core dumps disabled - 
https://dovecot.org/bugreport.html#coredumps)
Nov 04 08:04:25 vhrz311 dovecot[6163]: 
imap(xxx at staff.uni-marburg.de)<63176><ad/jlkKzSs2sGQEp>: Error: Raw 
backtrace: /usr/lib/dovecot/libdovecot.so.0(backtrace_append+0x42) 
[0x7f1dd28d6d22] -> /usr/lib/dovecot/libdovecot.so.0(backtrace_get+0x1e) 
[0x7f1dd28d6e3e] -> /usr/lib/dovecot/libdovecot.so.0(+0xed75e) 
[0x7f1dd28e175e] -> /usr/lib/dovecot/libdovecot.so.0(+0xed801) 
[0x7f1dd28e1801] -> /usr/lib/dovecot/libdovecot.so.0(i_fatal+0) 
[0x7f1dd2836beb] -> /usr/lib/dovecot/libdovecot.so.0(+0xcd40e) 
[0x7f1dd28c140e] -> 
/usr/lib/dovecot/libdovecot.so.0(message_parser_parse_next_block+0x15c) 
[0x7f1dd28c2b2c] -> 
/usr/lib/dovecot/libdovecot.so.0(message_search_msg+0xa0) 
[0x7f1dd28c52a0] -> /usr/lib/dovecot/libdovecot-storage.so.0(+0xc8f9e) 
[0x7f1dd2c67f9e] -> 
/usr/lib/dovecot/libdovecot-storage.so.0(mail_search_args_foreach+0x45) 
[0x7f1dd2be31e5] -> /usr/lib/dovecot/libdovecot-storage.so.0(+0xca111) 
[0x7f1dd2c69111] -> /usr/lib/dovecot/libdovecot-storage.so.0(+0xcb214) 
[0x7f1dd2c6a214] -> 
/usr/lib/dovecot/libdovecot-storage.so.0(index_storage_search_next_nonblock+0x10d) 
[0x7f1dd2c6a9ed] -> 
/usr/lib/dovecot/libdovecot-storage.so.0(mailbox_search_next_nonblock+0x22) 
[0x7f1dd2becdf2] -> dovecot/imap(+0x25eb1) [0x561689529eb1] -> 
dovecot/imap(command_exec+0x64) [0x561689522bc4] -> 
dovecot/imap(+0x25592) [0x561689529592] -> 
/usr/lib/dovecot/libdovecot.so.0(io_loop_handle_timeouts+0x12f) 
[0x7f1dd28fa3ff] -> 
/usr/lib/dovecot/libdovecot.so.0(io_loop_handler_run_internal+0xbe) 
[0x7f1dd28fbebe] -> 
/usr/lib/dovecot/libdovecot.so.0(io_loop_handler_run+0x4c) 
[0x7f1dd28fa75c] -> /usr/lib/dovecot/libdovecot.so.0(io_loop_run+0x38) 
[0x7f1dd28fa988] -> 
/usr/lib/dovecot/libdovecot.so.0(master_service_run+0x13) 
[0x7f1dd2867c23] -> dovecot/imap(main+0x339) [0x561689512d19] -> 
/lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xe7) [0x7f1dd2424bf7] 
-> dovecot/imap(_start+0x2a) [0x561689512f2a]


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