Bug 21424
| Summary: | Blocking issue while regenerating aliases on 4.1-RELEASE | ||
|---|---|---|---|
| Product: | Base System | Reporter: | Fernando Schapachnik <fpscha> |
| Component: | kern | Assignee: | freebsd-bugs (Nobody) <bugs> |
| Status: | Closed FIXED | ||
| Severity: | Affects Only Me | ||
| Priority: | Normal | ||
| Version: | 4.1-RELEASE | ||
| Hardware: | Any | ||
| OS: | Any | ||
State Changed From-To: open->feedback Does this problem still occur with newer releases? State Changed From-To: feedback->closed Automatic feedback timeout. This PR remained unchanged in the feedback state for more than 4 months. If additional feedback that warrants the re-opening of this PR is available but not included in the audit trail, please include the feedback in a reply to this message (preserving the Subject line) and ask that the PR be re-opened. |
First thing I noticed was that newaliases was getting hung. Further investigation showed the problem was ~majordom/aliases.majordom.db Running makemap hash ~majordom/aliases.majordom < ~majordom/aliases.majordom hunged also. A fstat showed only sendmail has this file open, and for reading only. A ktrace shows: [...] 87185 makemap CALL open(0xbfbff658,0x622,0x1a4) 87185 makemap NAMI "aliases.majordomo.db" [a lot of time... sent kill] 87185 makemap PSIG SIGINT SIG_DFL aliases.majordom.db ends with 0 bytes. Removing the file solves the problem. Sometimes same thing happens with virtusertable and similar aliases-related files. Today the same happened with access.db. Lsof showed sendmail 52975 root 7rR VREG 109,196608 0 35980 /etc/mail/access.db which means sendmail has the whole file locked for reading. Doing a ps -axl shows lockfs state and a sleeping process (waiting for a lock, I guess). Fix: Workaround: Remove the .db file and run newaliases/makemap acordingly. To avoing concurrency problems, I'm using this script: #!/bin/sh dir=/usr/local/sendmail_aliases # Copy actual alias file to fake dir. cp /usr/local/majordomo/aliases.majordomo $dir/usr/local/majordomo/aliases.ma jordomo cp /etc/mail/alias-de-clientes $dir/etc/mail/alias-de-clientes cp /etc/mail/aliases $dir/etc/mail/aliases cp /etc/mail/usertable $dir/etc/mail/usertable # Regenerate aliases inside the cage. /usr/sbin/chroot $dir /usr/sbin/sendmail -bi /usr/sbin/chroot $dir /usr/sbin/makemap hash /etc/mail/usertable < /etc/mail/ usertable # Put aliases files in its proper place. cp $dir/usr/local/majordomo/aliases.majordomo.db /usr/local/majordomo/aliases .majordomo.db cp $dir/etc/mail/alias-de-clientes.db /etc/mail/alias-de-clientes.db cp $dir/etc/mail/aliases.db /etc/mail/aliases.db cp $dir/etc/mail/usertable.db /etc/mail/usertable.db How-To-Repeat: Run newaliases during busy hours.