On Tue, 8 Dec 2009, Erik Trulsson wrote:
On Tue, Dec 08, 2009 at 02:09:03PM +0300, cronfy wrote:
panics like 'freeing free block' or 'ffs_valloc: dup alloc'
Is there a way to say "Dear kernel, don't panic, I'am holding your
hand, keep working please-please-please?" If so, can it lead to
complete filesystem corruption indeed or it is not so serious?
Afaik you can't do this. And you shouldn't do if it'd be possible. The
file system errors you mention above should not happen under any
normal circumstances. They may happen after a crash caused by other
reasons but should get repaired by fsck. The kernel cannot continue
with such errors because the whole file system metadata cannot be
trusted anymore until repaired.
Thanks.
What I can definitely state is that after reboot nothing will get any
better. I will have same filesystem with same errors + new errors that
appeared because soft-updates were not synced, and I will have fsck
running in background. I'd prefer to just start fsck in background,
skipping that annoying reboot phase ;-) Am I willing strange?
Background fsck can only handle a few, very specific, filsystem problems.
(Basically situations where blocks are marked as being in use, even though
they are not really used by anything. Softupdates is supposed to guarantee
that those are the only types of filesystem errors that can occur, but in
reality that guarantee does not always hold.)
If you have other instances of filesystem corruption (which includes
everything which can trigger a kernel panic) you need to use a foreground
fsck to fix it.
That's true. You should go down to single user mode by entering "shutdown
now", unmount your filesystems ("umount -a -t ufs") and check your
filesystem by "fsck -y". Please read "man fsck" before since implicitly
answering all questions with yes by "-y" may cause loss of data !!!
(To tell the truth: You probably have to do so anyway.)
Personally I would recommend not using background fsck at all unless you
know exactly what you are doing and why.
Best regards
Konrad Heuer
GWDG, Am Fassberg, 37077 Goettingen, Germany, [email protected]
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