UFS panic on Google Compute Engine

[Bryan Venteicher]

----- Original Message -----
> Okay, I've hit this now the third time. Massive file system corruption.
> fsck reports lots of
> 
> UNALLOCATED  I=6350  OWNER=root MODE=0
> SIZE=0 MTIME=Jan  1 00:00 1970
> NAME=/usr/ports/x11-themes/metacity-theme-microgui
> 
> UNEXPECTED SOFT UPDATE INCONSISTENCY
> 
> and
> 
> LINK COUNT DIR I=1175282  OWNER=root MODE=40755
> SIZE=512 MTIME=Jan  9 03:28 2014  COUNT 3 SHOULD BE 2
> ADJUST? yes
> 
> LINK COUNT DIR I=1175287  OWNER=root MODE=40755
> SIZE=512 MTIME=Jan  9 03:28 2014  COUNT 3 SHOULD BE 2
> ADJUST? yes
> 
> It seems rather easy to reproduce. Upload a disk image to GCE and
> extract ports. I did it via portsnap fetch extract. I am not sure what
> could go so horribly wrong. In two of three cases the filesystem was
> beyond repair.
> 
> As for problem causes: Has the virtio scsi driver changed significantly
> between FreeBSD 9 and 10?
> 

No. The drivers are the same.

What happens when you try to portsnap fetch extract locally? I haven't
been able to recreate this, and in preparation to enabling unmapped IO
support VirtIO SCSI, I've been doing Poudriere builds without any
apparent issues.

I've been meaning to spin up some GCE instances to try out. I'll try
to get do that this weekend.


> Also weird is that the same virtual disk pops up two times:
> 
> da0 at vtscsi0 bus 0 scbus0 target 1 lun 0
> da0: <Google PersistentDisk 1> Fixed Direct Access SCSI-6 device
> da0: 300.000MB/s transfers
> da0: 10240MB (20971520 512 byte sectors: 255H 63S/T 1305C)
> da1 at vtscsi0 bus 0 scbus0 target 1 lun 1
> da1: <Google PersistentDisk 1> Fixed Direct Access SCSI-6 device
> da1: 300.000MB/s transfers
> da1: 10240MB (20971520 512 byte sectors: 255H 63S/T 1305C)
> 

Odd, but they're different LUNs.

> Julian
> 
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