Difficult to figure out without a coredump + gdb
I have also battled quite a lot to make sure dovecot can core dump on my Archlinux servers.
I remember that the key point was putting fs.suid_dumpable=2 in /etc/sysctl.d/ conf files, LimitCORE=infinity in /etc/systemd/system/multi-user.target.wants/dovecot.service, and rebooting the server.
My own coredumps are on /var/lib/systemd/coredump/
Here it is:Jan 14 09:26:08 mail dovecot: indexer-worker(paul@iwascoding.com)<16777><IKpfOqBHPFyJQQAADYqDFA>: Debug: Effective uid=8, gid=8, home=/var/spool/mail/iwascoding/paul
Jan 14 09:26:08 mail dovecot: indexer-worker(paul@iwascoding.com)<16777><IKpfOqBHPFyJQQAADYqDFA>: Debug: Quota root: name=User quota backend=dict args=:file:/var/spool/mail/iwascoding/paul/dovecot-quota
Jan 14 09:26:08 mail dovecot: indexer-worker(paul@iwascoding.com)<16777><IKpfOqBHPFyJQQAADYqDFA>: Debug: Quota rule: root=User quota mailbox=* bytes=2147483648 messages=0
Jan 14 09:26:08 mail dovecot: indexer-worker(paul@iwascoding.com)<16777><IKpfOqBHPFyJQQAADYqDFA>: Debug: Quota rule: root=User quota mailbox=* bytes=2147483648 messages=60000
Jan 14 09:26:08 mail dovecot: indexer-worker(paul@iwascoding.com)<16777><IKpfOqBHPFyJQQAADYqDFA>: Debug: Quota grace: root=User quota bytes=214748364 (10%)
Jan 14 09:26:08 mail dovecot: indexer-worker(paul@iwascoding.com)<16777><IKpfOqBHPFyJQQAADYqDFA>: Debug: dict quota: user=paul@iwascoding.com, uri=file:/var/spool/mail/iwascoding/paul/dovecot-quota, noenforcing=0
Jan 14 09:26:08 mail dovecot: indexer-worker(paul@iwascoding.com)<16777><IKpfOqBHPFyJQQAADYqDFA>: Debug: Namespace inbox: type=private, prefix=, sep=/, inbox=yes, hidden=no, list=yes, subscriptions=yes location=mdbox:~/mdbox
Jan 14 09:26:08 mail dovecot: indexer-worker(paul@iwascoding.com)<16777><IKpfOqBHPFyJQQAADYqDFA>: Debug: fs: root=/var/spool/mail/iwascoding/paul/mdbox, index=, indexpvt=, control=, inbox=, alt=
Jan 14 09:26:08 mail dovecot: indexer-worker(paul@iwascoding.com)<16777><IKpfOqBHPFyJQQAADYqDFA>: FTS Xapian: Partial=2, Full=20 DB_PATH=/var/spool/mail/iwascoding/paul/mdbox/xapian-indexes
Jan 14 09:26:08 mail dovecot: indexer-worker(paul@iwascoding.com)<16777><IKpfOqBHPFyJQQAADYqDFA>: Debug: quota: quota_over_flag check: quota_over_script unset - skipping
Jan 14 09:26:08 mail dovecot: indexer-worker(paul@iwascoding.com)<16777><IKpfOqBHPFyJQQAADYqDFA>: Debug: Mailbox sent: Mailbox opened because: indexing
Jan 14 09:26:08 mail dovecot: indexer-worker(paul@iwascoding.com)<16777><IKpfOqBHPFyJQQAADYqDFA>: FTS Xapian : Mailbox sent : Last UID=0
Jan 14 09:26:08 mail dovecot: indexer-worker(paul@iwascoding.com)<16777><IKpfOqBHPFyJQQAADYqDFA>: FTS Xapian : Mailbox sent : Last UID=0
Jan 14 09:26:08 mail dovecot: indexer-worker(paul@iwascoding.com)<16777><IKpfOqBHPFyJQQAADYqDFA>: Debug: Namespace : Using permissions from /var/spool/mail/iwascoding/paul/mdbox: mode=0700 gid=default
Jan 14 09:26:08 mail dovecot: indexer-worker(paul@iwascoding.com)<16777><IKpfOqBHPFyJQQAADYqDFA>: Debug: Mailbox sent: UID 1: Opened mail because: fts indexing
Jan 14 09:26:08 mail dovecot: indexer-worker(paul@iwascoding.com)<16777><IKpfOqBHPFyJQQAADYqDFA>: Opening RW /var/spool/mail/iwascoding/paul/mdbox/xapian-indexes/db_9ddfe10d8a8a8a568c120000654d370e
Jan 14 09:26:08 mail dovecot: indexer-worker(paul@iwascoding.com)<16777><IKpfOqBHPFyJQQAADYqDFA>: Debug: Mailbox sent: UID 2: Opened mail because: fts indexing
Jan 14 09:26:08 mail dovecot: indexer-worker(paul@iwascoding.com)<16777><IKpfOqBHPFyJQQAADYqDFA>: Debug: Mailbox sent: UID 3: Opened mail because: fts indexingThank you!
On 14. Jan 2019, at 10:11, Joan Moreau via dovecot <dovecot@dovecot.org> wrote:
Can you send the log part that includes the "init" of the plugins (something similar as below) ?
WHich version of Xapian are you on ?
Jan 14 09:10:04 gjserver dovecot[31082]: indexer-worker(admin@grosjo.net)<14725><apZfHexRPFy9QAAA0thIag:UL+TNOxRPFyFOQAA0thIag>: FTS Xapian: Partial=2, Full=20 DB_PATH=/data/mail/grosjo.net/admin/xapian-indexes
Jan 14 09:10:04 gjserver dovecot[31082]: indexer-worker(admin@grosjo.net)<14725><apZfHexRPFy9QAAA0thIag:UL+TNOxRPFyFOQAA0thIag>: FTS Xapian : Mailbox Mail : Last UID=815055
Jan 14 09:10:04 gjserver dovecot[31082]: indexer-worker(admin@grosjo.net)<14725><apZfHexRPFy9QAAA0thIag:UL+TNOxRPFyFOQAA0thIag>: FTS Xapian : Mailbox Mail : Last UID=815055
Jan 14 09:10:04 gjserver dovecot[31082]: indexer-worker(admin@grosjo.net)<14725><apZfHexRPFy9QAAA0thIag:UL+TNOxRPFyFOQAA0thIag>: Opening RW /data/mail/grosjo.net/admin/xapian-indexes/db_5c935034609bc14c0e550000d6a3092d
Hi,
I installed and tested your version, but the indexer process crashes reproducible with the following command after about 2000 messages were indexed:
doveadm index -u paul@iwascoding.com -q \*
Jan 14 09:26:15 mail dovecot: indexer-worker(paul@iwascoding.com)<16777><IKpfOqBHPFyJQQAADYqDFA>: Debug: Mailbox sent: UID 2038: Opened mail because: fts indexing
Jan 14 09:26:15 mail dovecot: indexer-worker: Error: terminate called after throwing an instance of 'std::bad_alloc'
Jan 14 09:26:15 mail dovecot: indexer-worker: Error: what(): std::bad_alloc
Jan 14 09:26:15 mail dovecot: indexer: Error: Indexer worker disconnected, discarding 48 requests for paul@iwascoding.com
Jan 14 09:26:15 mail dovecot: indexer-worker(paul@iwascoding.com)<16777><IKpfOqBHPFyJQQAADYqDFA>: Fatal: master: service(indexer-worker): child 16777 killed with signal 6 (core dumps disabled - https://dovecot.org/bugreport.html#coredumps)
I tried to delete the message, but this does not help (crashes e.g. after message 2029 or 2044). Other folders with fewer messages were successfully indexed before.
Sorry, could not convince dovecot to create core dumps (read the docs, changed /proc/sys/kernel/core_pattern, added LimitCORE=unlimited/infinity, even created /etc/systemd/system/dovecot.service.d/coredump.conf to no avail). Custom Dovecot 2.3.4 on Debian Stretch.
Thanks,
Paul