On Tue, 28 Feb 2006, Fermin Molina wrote:
Just to add -- our fcntl locking issue is on Linux, we've
seen it on 2.6.9, 2.6.13.1 and 2.6.15.3, running Mandrake 10.2.
locking.tdb is on a local disk. All smbd child processes are
blocked on apparently the same fcntl when it happens.
Hmmm...ok. That ruins my theory. I thought you were on AIX
as well. And just to make sure, you are running Samba 3.0.21b
as well?
Correct -- 3.0.21b on Linux 2.6. We had the same problem with 3.0.20 but
it was MUCH more frequent... 3.0.21b seems to have reduced the frequency
of the problem occurring but it does still seem to be there.
I have had exactly the same problem. I reported that in thread "Samba
daemons hang trying to lock locking.tdb", about Jan 25.
I had a NFS mount from another server and then shared with samba. I
moved the information on that server localy to the Samba server
(avoiding NFS). All goes ok from that change.
I don't understand why it works, because all smbd daemons were hanging
in the previously commented fcntl call, that locks "locking.tdb" (that
was located in local filesystem, not in any NFS mounted shares).
I'm using FC4 with last updates (kernel included) and samba 3.0.21b.
That's the one. We are indeed sharing volumes from the Samba server
which have been mounted via NFS, perhaps this is indeed an issue?
Something subtle with regard to tdb locking deadlocking in very specific
cases for samba-reshared NFS filesystems? (And yes, our locking.tdb is
on a local /var.)
To reiterate... the fcntl64 spins in a blocking wait, so we never see an
error unfortunately. It is always one of the 1-byte locks in locking.tdb
which it jams on. Also, no change to this behaviour from 3.0.20 through
3.0.21b -- all have been broken, although 3.0.20 seemed to break more
frequently than 3.0.21b.
cheers
Matt
--
======================================================================
Matt Johnson <[EMAIL PROTECTED]> (020) 7594 8440 / x48440
Systems Programmer, Computing Support Group Office: Huxley 225
Department of Computing, Imperial College London
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