Re: It still here... panic: ufs_dirbad: bad dir


:Just in case anyone thought the bug had been fixed...
:
:FreeBSD 7.0-CURRENT #531: Mon Jan 2 11:32:17 PST 2006 i386
:
:panic: ufs_dirbad: bad dir
:...

:-- David (obrien@xxxxxxxxxxx)
:Q: Because it reverses the logical flow of conversation.
:A: Why is top-posting (putting a reply at the top of the message) frowned upon?

We are still seeing it in DragonFly, too. Right now I have two reports,
one from DR, one from Tomaz. It doesn't happen very often but it
definitely still happens.

I have already turned off background bitmap writes and I disallow inode
reuse before the previous user finishes flushing its buffers out. All
related softupdates fixes made in FreeBSD have been ported to DragonFly.

David, have you tried turning off doreallocblks ? i.e. set
vfs.ffs.doreallocblks=0. Both Davids, please try that, do a full manual
fsck, and report if the problem still occurs. If it doesn't fix it then
we will at least eliminate another possible source for the problem.

I wish there were a way to reliably reproduce the failure.

I'm running out of ideas. Right now my best idea is that there is
something broken in the code that writes out the modified 'rewound'
blocks. Perhaps an old version of a buffer, with old already-reused
block pointers, is being written out and then something happens to
prevent the latest version from being written out. I don't know, I'm
grasping at straws here. If I could only reliably reproduce the bug
I would write some code to record every I/O operation done on the
raw device then track back to the write that created the corruption.

-Matt
Matthew Dillon
<dillon@xxxxxxxxxxxxx>
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