[issue1504] hammer crash on cleanups

Matthew Dillon dillon at apollo.backplane.com
Wed Sep 16 18:06:04 PDT 2009

:I had something very similar on 95% full hammer FS with version of FS =3D 1=
:After upgrading it to v2 panics vent away.
:Also here are some interesting lines in /var/log/messages, possibly
:indicating corrupted media:
:Sep 16 01:22:42 dfly kernel: ad4: WARNING - WRITE_DMA UDMA ICRC error
:(retrying request) LBA=3D92046464
:Sep 16 01:26:18 dfly syslogd: kernel boot file is /boot/kernel
:Sep 16 01:26:18 dfly kernel: ad4: FAILURE - device detached
:Sep 16 01:26:18 dfly kernel: subdisk4: detached
:Sep 16 01:26:18 dfly kernel: HAMMER(Share_Big): Critical error
:Dennis Melentyev

    Gotta be two different things.  Basically ad4 had a DMA error and
    detached and the HAMMER filesystem, being unable to write, threw a fit.
    That would be an issue with NATA.  HAMMER was just saving itself.

    That sort of UDMA failure is usually indicative of an IDE wiring

    We did fix a bug in HAMMER related to very rare incorrect B-Tree
    deletions which would lead to lost inodes and potentially panics.
    Anything like that should no longer occur.

					Matthew Dillon 
					<dillon at backplane.com>

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