[Bug 14734] BUG: unable to handle kernel NULL pointer dereference at 0000000000000808

[Bug 14734] BUG: unable to handle kernel NULL pointer dereference at 0000000000000808

[bugzilla-daemon]

http://bugzilla.kernel.org/show_bug.cgi?id=14734





--- Comment #1 from Theodore Tso <tytso@mit.edu>  2009-12-06 21:02:16 ---
On Fri, Dec 04, 2009 at 03:39:30PM +0000, bugzilla-daemon@bugzilla.kernel.org
wrote:
> 
> Just let me know what else I should post in addition to the following. I've
> gotten this bug pretty consistently, on 2.6.

Hmm.... there's a strnage fsnotify_clear_marks_by_inode() on the stack
trace which doesn't seem to make any sense and which I can't place.
Are you using the fsnotify feature for some reason (i.e., some
new-fangled proprietnary "linux anti-virus" package or some such?).
If so, does the problem go away if you stop using said package and not
use the fsnotify interface?

Also, do you have to do anything special to trigger it?  Is the "rm"
in the process handle an "rm -rf", or some such?

                                                      - Ted

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[Bug 14734] BUG: unable to handle kernel NULL pointer dereference at 0000000000000808

[bugzilla-daemon]

http://bugzilla.kernel.org/show_bug.cgi?id=14734


Jan Kara <jack@suse.cz> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |jack@suse.cz




--- Comment #2 from Jan Kara <jack@suse.cz>  2009-12-09 12:27:39 ---
I believe this is a faulty memory:
Looking at the disassembly we most probably oopsed while doing
page_cache_get_speculative(page) where page was 0000000000000800. So it's a
single bit flip from NULL in which case we'd just go on with another page.
Could you try running memtest for some time?

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[Bug 14734] BUG: unable to handle kernel NULL pointer dereference at 0000000000000808

[bugzilla-daemon]

http://bugzilla.kernel.org/show_bug.cgi?id=14734





--- Comment #3 from stmcdermott@gmail.com  2009-12-09 13:45:01 ---
I'll execute a memtest tonight.

thanks

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[Bug 14734] BUG: unable to handle kernel NULL pointer dereference at 0000000000000808

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=14734


Alan <alan@lxorguk.ukuu.org.uk> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
                 CC|                            |alan@lxorguk.ukuu.org.uk
         Resolution|                            |UNREPRODUCIBLE




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[Bug 14734] BUG: unable to handle kernel NULL pointer dereference at 0000000000000808

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=14734


Alan <alan@lxorguk.ukuu.org.uk> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|RESOLVED                    |CLOSED




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