Re: mds crash on snaptest-2

[Thomas Mueller <thomas@chaschperli.ch>]

>> the test still fails with ceph.git/unstable from today. now cmds doesn't
>> exit anymore. But after a half an hour the test kills itself because of a
>> timeout (normal running time is about 10 minutes).
>>
>> - Thomas
>>
>> PS: found out that vstart.sh places logs in subdir "out" too. so tell me
>> if you need some of them.
> Yes, I've been working on this for some time now. If you try the test
> on a single MDS it should work fine with the latest git, but there are
> some deeper issues going on with an MDS cluster that we're having a
> hard time isolating in a way that lets us fix it. It appears we might
> need to rework our snapshot inode handling a bit and Sage has asked me
> to move on.
>
> I'd recommend doing your testing on a single MDS (if using vstart:
> CEPH_NUM_MDS=1 ./vstart -- this also works for _OSD and _MON) system
> until we say that we expect the MDS cluster to work under more
> circumstances.

i'm  always starting just one daemon. my test script sets these vars 
before calling "vstart.sh":

export CEPH_NUM_MON=1
export CEPH_NUM_OSD=1
export CEPH_NUM_MDS=1

last known good rev was  ae82dd5a5c964bb310a5512d10d1e062cbb0c1a5 on 
July 8 - with this rev the test was working fine.

i've also tried to compile with "-O0" to run it with gdb (not that i'm a 
gdb expert..) - but the binaries failed to start (ok back then it was 
bit late ...)

- Thomas