Filesystem errors with VirtIO

[Philipp]

Hi everyone,

I'm running FreeBSD 10.0-RELEASE on a virtualized KVM server. I'm
using VirtIO from base to access NIC and HDD directly. Filesystem is
UFS2 with Journaling and SU. Last week I had to reinstall FreeBSD
because the salvation of the several filesystem errors wasn't possible
anymore. I don't have any evidence but I guess it has something to do
with the VirtIO driver.

After running the machine for 48 hours with a freshly installed
FreeBSD 10 several soft update inconsistencies occur:

# fsck
** /dev/vtbd0p2 (NO WRITE)

USE JOURNAL? no

** Skipping journal, falling through to full fsck

SETTING DIRTY FLAG IN READ_ONLY MODE

UNEXPECTED SOFT UPDATE INCONSISTENCY
** Last Mounted on /
** Root file system
** Phase 1 - Check Blocks and Sizes
** Phase 2 - Check Pathnames
** Phase 3 - Check Connectivity
LINK COUNT INCREASING
UNEXPECTED SOFT UPDATE INCONSISTENCY

ADJUST? no

LINK COUNT DIR I=11075332  OWNER=root MODE=40755
SIZE=512 MTIME=Jan 20 15:06 2014  COUNT 0 SHOULD BE 1
LINK COUNT INCREASING
UNEXPECTED SOFT UPDATE INCONSISTENCY

ADJUST? no

LINK COUNT DIR I=11316145  OWNER=root MODE=40755
SIZE=512 MTIME=Jan 20 15:26 2014  COUNT 0 SHOULD BE 1
LINK COUNT INCREASING
UNEXPECTED SOFT UPDATE INCONSISTENCY

ADJUST? no

UNREF FILE I=11316146  OWNER=root MODE=100644
SIZE=227096 MTIME=Jan 20 15:26 2014 
CLEAR? no

LINK COUNT DIR I=11316147  OWNER=root MODE=40755
SIZE=512 MTIME=Jan 20 15:34 2014  COUNT 0 SHOULD BE 1
LINK COUNT INCREASING
UNEXPECTED SOFT UPDATE INCONSISTENCY

ADJUST? no

LINK COUNT DIR I=11316148  OWNER=root MODE=40755
SIZE=512 MTIME=Jan 20 15:49 2014  COUNT 0 SHOULD BE 1
LINK COUNT INCREASING
UNEXPECTED SOFT UPDATE INCONSISTENCY

ADJUST? no

UNREF FILE I=11316150  OWNER=root MODE=100644
SIZE=928 MTIME=Jan 20 15:49 2014 
CLEAR? no

LINK COUNT DIR I=11333352  OWNER=root MODE=40755
SIZE=512 MTIME=Jan 20 15:18 2014  COUNT 0 SHOULD BE 1
LINK COUNT INCREASING
UNEXPECTED SOFT UPDATE INCONSISTENCY

ADJUST? no

** Phase 5 - Check Cyl groups
250807 files, 860388 used, 36209947 free (8179 frags, 4525221 blocks,
0.0% fragmentation)

After a reboot different inconsistencies appear. I had the very same
problems with 9.2-RELEASE, which caused the need of a reinstallation
of the OS (errors like "vtbd0: hard error cmd=write fsbn 24162"
occured).

Can someone confirm these problems with VirtIO? What else can I do?

Regards, Philipp