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Re: hardware or software bug?


On Tue, Apr 16, 2002 at 05:02:55PM +0100, Matt Bernstein wrote:
> At 14:20 +0100 Stephen C. Tweedie wrote:
> >> >Assertion failure in do_get_write_access() at transaction.c:611: "!(((jh2bh(jh))->b_state & (1UL << BH_Lock)) != 0)"
> >
> >What were you doing at the time?  Writing to the live fs can cause
> >this (that's normally illegal, but "tune2fs" can do it safely in some
> >cases, eg. to write a new volume label.)
> It was about 2am, so *we* weren't doing anything, but the backups will be
> running.
> >More seriously, since 2.4.11, there's a page-cache/buffer-cache
> >aliasing problem which can lead to this being hit in ext3 if you
> >merely read from the buffered block device on which the fs sits.  This
> >can happen, for example, if you dump(8) a live filesystem.  I've got a
> >fix pending for the ext3 side of that problem, and have posted the
> >core VFS fix to l-k.
> *blush* We dump our filesystems live. I bet we're not the only ones.

Indeed, it's common enough, but it's unsafe for various reasons.  With
LVM, it should work a bit better.

At least with the current patches, it shouldn't oops any more.


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