execute sieve command - fails to notice script has exited

[Lionel Elie Mamane]

And the Sieve script:

------- start sieve script ---------
require ["vnd.dovecot.execute", "fileinto", "mailbox", "vnd.dovecot.debug"];

debug_log "about to execute";
if not execute :pipe "foofilter" {
  debug_log "if condition fulfilled";
  fileinto :create "test-spam";
  debug_log "about to stop";
  stop;
}
debug_log "after execute";
------- end sieve script ---------

The user's sieve log looks like:

sieve: info: started log at Nov 13 16:56:32.
test-foofilter: line 3: info: DEBUG: about to execute.
test-foofilter: line 4: error: execute action: failed to execute to program `foofilter': refer to server log for more information. [2018-11-13 16:59:57].
test-foofilter: line 5: info: DEBUG: if condition fulfilled.
test-foofilter: line 7: info: DEBUG: about to stop.
info: msgid=<20181113155632.k6pybm45sdwwp2bs at blitz.conuropsis.org>: stored mail into mailbox 'test-spam'.


On Tue, Nov 13, 2018 at 05:00:21PM +0100, Lionel Elie Mamane wrote:
> Hi,
> 
> Running dovecot 2.2.27 (c0f36b0) on Debian GNU/Linux stable (version
> 9.6), I'm trying to use the execute command in a sieve script, with
> direct execution (not service socket).
> 
> The script is executed, and returns (the process exits), but the
> dovecot-lda process seems to not notice, and thinks the script did not
> terminate. After sieve_execute_exec_timeout has passed, it sends a
> TERM, a bit later a KILL and then logs a failure.
> 
> The "ps -Af f" looks like:
> S      0:00  \_ /usr/sbin/exim4 -Mc 1gMazS-0007IV-RB
> S      0:00      \_ /usr/lib/dovecot/dovecot-lda -f master at blitz.conuropsis.org
> Z      0:00      |   \_ [foofilter] <defunct>
> S      0:00      \_ /usr/sbin/exim4 -Mc 1gMazS-0007IV-RB
> 
> The dovecot debug log looks like:
> 
> lda(user): Debug: Loading modules from directory: /usr/lib/dovecot/modules
> lda(user): Debug: Module loaded: /usr/lib/dovecot/modules/lib90_sieve_plugin.so
> lda(user): Debug: Effective uid=1000, gid=1000, home=/home/user
> lda(user): Debug: maildir++: root=/home/user/Maildir, index=, indexpvt=, control=, inbox=/home/user/Maildir, alt=
> lda(user): Debug: userdb lookup skipped, username taken from USER environment
> lda(user): Debug: none: root=, index=, indexpvt=, control=, inbox=, alt=
> lda(user): Debug: Destination address: user at blitz.conuropsis.org (source: user at hostname)
> lda(user): Debug: sieve: Pigeonhole version 0.4.16 (fed8554) initializing
> lda(user): Debug: sieve: include: sieve_global is not set; it is currently not possible to include `:global' scripts.
> lda(user): Debug: sieve: Sieve imapsieve plugin for Pigeonhole version 0.4.16 (fed8554) loaded
> lda(user): Debug: sieve: Sieve Extprograms plugin for Pigeonhole version 0.4.16 (fed8554) loaded
> lda(user): Debug: sieve: file storage: Using active Sieve script path: /data/home/user/.dovecot.sieve
> lda(user): Debug: sieve: file storage: Using script storage path: /home/user/sieve
> lda(user): Debug: sieve: file storage: Relative path to sieve storage in active link: sieve/
> lda(user): Debug: sieve: file storage: Using Sieve script path: /data/home/user/.dovecot.sieve
> lda(user): Debug: sieve: file script: Opened script `test-foofilter' from `/data/home/user/.dovecot.sieve'
> lda(user): Debug: sieve: Using the following location for user's Sieve script: /data/home/user/.dovecot.sieve
> lda(user): Debug: Mailbox stdin: Opened mail UID=1 because: header Message-ID (Cache file is unusable)
> lda(user): Debug: sieve: Opening script 1 of 1 from `/data/home/user/.dovecot.sieve'
> lda(user): Debug: sieve: Loading script /data/home/user/.dovecot.sieve
> lda(user): Debug: sieve: Script binary /data/home/user/.dovecot.svbin successfully loaded
> lda(user): Debug: sieve: binary save: not saving binary /data/home/user/.dovecot.svbin, because it is already stored
> lda(user): Debug: sieve: Executing script from `/data/home/user/.dovecot.svbin'
> lda(user): Debug: sieve: action execute: running program: foofilter
> lda(user): Debug: Mailbox stdin: Opened mail UID=1 because: mail stream
> lda(user): Debug: waiting for program `/usr/local/lib/dovecot/sieve-execute/foofilter' to finish after 0 msecs
> lda(user): Debug: program `/usr/local/lib/dovecot/sieve-execute/foofilter'(24669) execution timed out after 2000 milliseconds: sending TERM signal
> lda(user): Debug: program `/usr/local/lib/dovecot/sieve-execute/foofilter' (24669) did not die after 5000 milliseconds: sending KILL signal
> 
> 
> and an strace on the dovecot-lda process shows it is in an
> "epoll_wait(9 ....".
> 
> The script is very simple:
> 
> #! /bin/sh
> 
> cat > /dev/null
> exit 1
> 
> 
> Anyone has a clue? Thanks in advance.
> 
> Best Regards,
> 
> Lionel
>