Mailinglist Archive: opensuse-bugs (10046 mails)

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[Bug 231220] NFS related (?) kernel oops (Highmem machine)
  • From: bugzilla_noreply@xxxxxxxxxx
  • Date: Sun, 21 Jan 2007 21:44:35 -0700 (MST)
  • Message-id: <20070122044435.244CFD7D@xxxxxxxxxxxxxxxxxxxxxx>

------- Comment #12 from npiggin@xxxxxxxxxx 2007-01-21 21:44 MST -------
What's happened in the oops is that something invalid has been inserted into
the pagecache radix tree. This would not completely surprise me if it were an
NFS problem, but it could very well also be a single-bit flip if the hardware
is flakey (ie. where a NULL turned into 0x800). If the oops cannot be
reproduced, then it will be difficult to solve.

Regarding the hangs -- 1k block size will use more "buffer heads" and will
exercise some code paths that 4k block size does not. However it is interesting
and unexpected that performance is so much worse in this (not terribly
difficult) workload. Does the problem still occur on 1K filesystems?

Finally, the deadlock problems are quite rare, and the result should not be a
hung system in most cases (just a few hung programs), so I doubt that it is the
cause of your hangs.

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