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Subjectsync-Regression in
I recently installed on our postfix/dovecot-based
mailboxserver. Previously, 2.6.28 and have been running there
without a hitch.

Now with I had two major lockups: All writes to the users'
Maildirs (on ext4) would stall, the load would rise, "sync" would never

I had to "reboot -f -n" to get the machine back. All hanging processes
were unkillable, even with kill -9.

There was NOTHING in dmesg, nothing in the log either. No indication
of filesystem errors or anything.

Lookin at the
I see changes to

fs: sys_sync fix
fs: sync_sb_inodes fix
fs: remove WB_SYNC_HOLD

Since the mailserver uses sync() extensively (both dovecot and
postfix), maybe that's the culprit?

Note: I'm really just guessing here!
Back to for now.

Ralf Hildebrandt
Charite - Universitätsmedizin Berlin Tel. +49 (0)30-450 570-155
Geschäftsbereich IT | Abt. Netzwerk Fax. +49 (0)30-450 570-962
Hindenburgdamm 30 | 12200 Berlin
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