On Thu, Feb 24, 2011 at 10:20:28AM +0000, A. James Lewis wrote:

I've been running BTRFS for a while testing out various stuff, and I've
found it to be quite stable (although reading this list makes me realize
how much activity there really is).. I just hit my first bump in the
road, and I wondered if someone could give me a hint how I can gather
enough information to be useful here.

Basically, the filesystem I'm running is a 2 disk stripe, with mirrored
metadata.. I have default subvolume set, and I'm using 2 subvolumes.  I
have created a few snapshots of those subvolumes by mounting with -o
subvolid=0 and creating snapshots of the mounted subvolumes.

Recently (I think it started when I updated from .38rc1 to .38rc5 but
that could be coincidental)... when I mount subvolid=0, if I do a 'ls'
of that mount point, the filesystem hangs, and the system becomes
unusable.  Otherwise mounting and using the subvolumes is not affected.
At one point I got a Segfault from ls, but I've not been able to repeat
that.

Any suggestions would be interesting... I tried updating to rc6, but as
expected, (since there didn't seem to be much in the way of BTRFS
changes in that release) not much difference.

Do a sysrq+w when it hangs, that will tell us what the box is doing.  Thanks,

Josef