mail_crypt crashing randomly during LMTP

[Timo Sirainen]

On 30. Mar 2020, at 14.36, Andi Krischer <ak at michaelpelzer.de> wrote:
> 
>>> This is what the log says in the moment of crashing:
>>> dovecot: lmtp(53852): Panic: Module context mail_crypt_user_module missing
>>> *** backtrace *** (see: https://pastebin.com/YCiFtxmy)
>> 
>> It shows mailbox_free() in the backtrace, so it's probably crashing in mail_crypt_mailbox_close()'s MAIL_CRYPT_CONTEXT(box). But looking at the code, I can't see how that could be possible. Maybe there is some kind of memory corruption or something.
>> 
>>> dovecot: lmtp(53852): Fatal: master: service(lmtp): child 53852 killed with signal 6 (core dumps disabled - https://dovecot.org/bugreport.html#coredumps)
>> 
>> Could you get core dumps enabled? See the link. And from the core dump send at least:
>> 
>> bt full
>> fr 6 (or maybe 5 or 7, whichever makes the following command work)
>> p *box
>> 
>> Also please send your doveconf -n output.
> 
> 
> Core dump: https://pastebin.com/g4VkMXsT (hope this is everything - I’m not that familiar with core dumps…)

It's missing debug symbols. Are you using binaries from repo.dovecot.org <http://repo.dovecot.org/>? You'd need to install dovecot-dbg package to get more useful output.

And/or assuming it's installed from repo.dovecot.org <http://repo.dovecot.org/>, it would help if you could send me privately the core file and related libs (the core could contain some sensitive info like pieces of emails): dovecot-sysreport --core /usr/lib/dovecot/lmtp /path/to/core
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