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

[Jens Rey]

Since I want to avoid debugging old and already fixed bugs, I updated to

# dovecot --version
2.3.8 (9df20d2db)

Now the debug log is a bit more chatty, but the error remains:

Debug: program exec:/usr/lib/dovecot/sieve/rspamd-learn-ham.sh: Created
Debug: program exec:/usr/lib/dovecot/sieve/rspamd-learn-ham.sh: Pass 
environment: USER=user at domain.tld
Debug: program exec:/usr/lib/dovecot/sieve/rspamd-learn-ham.sh: Pass 
environment: HOME=/var/vmail/mailboxes/domain.tld/user
Debug: program exec:/usr/lib/dovecot/sieve/rspamd-learn-ham.sh: Pass 
environment: HOST=mail.domain.tld
Debug: Mailbox INBOX: UID 22039: Opened mail because: mail stream
Debug: program exec:/usr/lib/dovecot/sieve/rspamd-learn-ham.sh: 
Establishing connection
Debug: program exec:/usr/lib/dovecot/sieve/rspamd-learn-ham.sh: Forked 
child process
Debug: program exec:/usr/lib/dovecot/sieve/rspamd-learn-ham.sh (9891): 
Connected to program
Error: program exec:/usr/lib/dovecot/sieve/rspamd-learn-ham.sh (9891): 
write(program stdin) failed: Broken pipe
Debug: program exec:/usr/lib/dovecot/sieve/rspamd-learn-ham.sh (9891): 
Failed to run program
Debug: program exec:/usr/lib/dovecot/sieve/rspamd-learn-ham.sh (9891): 
Disconnected
Debug: program exec:/usr/lib/dovecot/sieve/rspamd-learn-ham.sh (9891): 
Child process ended
Error: program exec:/usr/lib/dovecot/sieve/rspamd-learn-ham.sh (9891): 
Terminated abnormally with signal 11
Debug: program exec:/usr/lib/dovecot/sieve/rspamd-learn-ham.sh (9891): 
Destroy
Error: sieve: pipe action: failed to pipe message to program 
`rspamd-learn-ham.sh': refer to server log for more information. 
[2019-11-17 19:32:40]
sieve: left message in mailbox 'INBOX'
Error: sieve: Execution of script 
/usr/lib/dovecot/sieve/report-ham.sieve failed
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