Learning ham/spam with IMAPSieve: sa-learn-ham.sh terminated abnormally, signal 11

[Stephan Bosch]

Op 20-11-2019 om 8:50 schreef Jens Rey via dovecot:
> Hi,
>
>> You can attach GDB to imap with follow-fork-mode set to 'child', so 
>> you can maybe see what causes the segfault.
>
> now I am confused. Hopefully, I used GDB correctly, but as far as I 
> can see, everything seemed to work.
>
> The only difference I can see is that I executed the whole thing as 
> root, but I would hope doveadm uses the correct user (vmail). At least 
> on the file system all emails still belong to vmail, so I guess that 
> works.
>
> For a quick reference, here is what I executed:
>
> root at mail:~# gdb --args doveadm exec imap -u user at domain
> ...
> (gdb) set follow-fork-mode child
> (gdb) r
> . SELECT Spam
> . MOVE 1 Inbox
>
> And the (imho) relevant output:
>
> imap(user at domain)<13290><+PcoBrjs1F3qMwAAcD3JoA>: Debug: program 
> exec:/usr/lib/dovecot/sieve/rspamd-learn-ham.sh: Establishing connection
> [New process 13335]
> imap(user at domain)<13290><+PcoBrjs1F3qMwAAcD3JoA>: Debug: program 
> exec:/usr/lib/dovecot/sieve/rspamd-learn-ham.sh: Forked child process
> imap(user at domain)<13290><+PcoBrjs1F3qMwAAcD3JoA>: Debug: program 
> exec:/usr/lib/dovecot/sieve/rspamd-learn-ham.sh (13335): Connected to 
> program
> [Thread debugging using libthread_db enabled]
> Using host libthread_db library 
> "/lib/x86_64-linux-gnu/libthread_db.so.1".
> process 13335 is executing new program: /bin/dash
> process 13335 is executing new program: /usr/bin/rspamc
> [Thread debugging using libthread_db enabled]
> Using host libthread_db library 
> "/lib/x86_64-linux-gnu/libthread_db.so.1".
> [New Thread 0x7fffee7ff700 (LWP 13338)]
> [New Thread 0x7fffebffe700 (LWP 13339)]
> [New Thread 0x7fffe97fd700 (LWP 13340)]
> imap(user at domain)<13290><+PcoBrjs1F3qMwAAcD3JoA>: Debug: program 
> exec:/usr/lib/dovecot/sieve/rspamd-learn-ham.sh (13335): Finished 
> streaming payload to program
> imap(user at domain)<13290><+PcoBrjs1F3qMwAAcD3JoA>: Debug: program 
> exec:/usr/lib/dovecot/sieve/rspamd-learn-ham.sh (13335): Finished 
> input to program
> imap(user at domain)<13290><+PcoBrjs1F3qMwAAcD3JoA>: Debug: program 
> exec:/usr/lib/dovecot/sieve/rspamd-learn-ham.sh (13335): Disconnected
> imap(user at domain)<13290><+PcoBrjs1F3qMwAAcD3JoA>: Debug: program 
> exec:/usr/lib/dovecot/sieve/rspamd-learn-ham.sh (13335): Waiting for 
> program to finish after 886 msecs
> [Thread 0x7fffe97fd700 (LWP 13340) exited]
> [Thread 0x7fffebffe700 (LWP 13339) exited]
> [Thread 0x7ffff7fd1140 (LWP 13335) exited]
> [Inferior 2 (process 13335) exited normally]
> imap(user at domain)<13290><+PcoBrjs1F3qMwAAcD3JoA>: Debug: program 
> exec:/usr/lib/dovecot/sieve/rspamd-learn-ham.sh (13335): Child process 
> ended
> imap(user at domain)<13290><+PcoBrjs1F3qMwAAcD3JoA>: Debug: program 
> exec:/usr/lib/dovecot/sieve/rspamd-learn-ham.sh (13335): Destroy
> imap(user at domain)<13290><+PcoBrjs1F3qMwAAcD3JoA>: Info: sieve: pipe 
> action: piped message to program `rspamd-learn-ham.sh'
>
>
> There is more output, lots more, but we are talking about spam after 
> all... If it is needed, please say so and I will provide it.

Hmm, so now it suddenly works. So, why would it not fail when run in GDB?

>
> Regards,
> Jens