DragonFly bugs List (threaded) for 2012-01
[DragonFlyBSD - Bug #2287] HAMMER(ROOT) Illegal UNDO TAIL signature at 300000001967c000
Issue #2287 has been reported by YONETANI Tomokazu.
Bug #2287: HAMMER(ROOT) Illegal UNDO TAIL signature at 300000001967c000
Author: YONETANI Tomokazu
After having experienced a few panics, the root filesystem is
no longer able to be mounted, even in read-only mode:
(booted from a USB stick)
# mount -thammer -o ro /dev/da0s1d /mnt
HAMMER(ROOT) recovery check seqno=3364b54c
HAMMER(ROOT) Illegal UNDO TAIL signature at 300000001967c000
HAMMER(ROOT) recovery failure during seqno fwdscan
HAMMER(ROOT) recovery complete
Failed to recover HAMMER filesystem on mount
hammer: mount on /mnt: Input/output error
I haven't tried `hammer recover' yet, as I have no idea what it does.
Is there anything I can do to recover from this situation? This is
a machine dedicated to testing DragonFly stability, so I can install
from scratch in the worst case.
The error message looks similar to the one described in issue1984,
but in this case even R/O mount fails.
The current kernel is built from 4f459, and it occasionally panics
even under almost no CPU or disk load. It could be a hardware failure,
but I couldn't find any indication of it as far as I watched the console
while it booted with the USB stick.
The previous kernel was built from 190f1b64, and it survived 10 days
without panic under pbulk load.
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