Hi.
There is a bug (6709336), which was closed with 'Not Reproducible' reason, but
I've a file system over here, where it is easy to reproduce. Dmitry (fs owner)
send me a snapshot of it (zfs send output) and I can reproduce it at will after
doing 'ls' in one of the directories.
It looks like there are three entires in directory that are duplicated.
After adding this patch, so it stops panicing:
http://people.freebsd.org/~pjd/patches/zap_micro.c.2.patch
and some more debug we can see something like this:
mzap_open: obj=6108
mze_insert: i=00: adding mze_name=[daily.20080701.gz] hash=16887356416216530944
mze_insert: i=01: adding mze_name=[daily.20080702.gz] hash=14729145520459087872
mze_insert: i=02: adding mze_name=[daily.20080703.gz] hash=15098007138724741120
mze_insert: i=03: adding mze_name=[daily.20080704.gz] hash=9227684390178390016
mze_insert: i=04: adding mze_name=[daily.20080705.gz] hash=11376611903104090112
mze_insert: i=05: adding mze_name=[daily.20080706.gz] hash=13533957483210473472
mze_insert: i=06: adding mze_name=[daily.20080707.gz] hash=11978674440062894080
mze_insert: i=07: adding mze_name=[daily.20080708.gz] hash=1783752625867456512
mze_insert: i=08: adding mze_name=[daily.20080709.gz] hash=373697339124088832
mze_insert: i=09: adding mze_name=[daily.20080710.gz] hash=12364645971085230080
mze_insert: i=10: adding mze_name=[daily.20080711.gz] hash=13147843840310247424
mze_insert: i=11: adding mze_name=[daily.20080712.gz] hash=10395742459047968768
mze_insert: i=12: adding mze_name=[daily.20080713.gz] hash=10208414471135690752
mze_insert: i=13: adding mze_name=[daily.20080714.gz] hash=15862282000518873088
mze_insert: i=14: adding mze_name=[daily.20080715.gz] hash=13964729096542879744
mze_insert: i=15: adding mze_name=[daily.20080716.gz] hash=16717135042526052352
mze_insert: i=16: adding mze_name=[daily.20080717.gz] hash=18019389811235749888
mze_insert: i=17: adding mze_name=[daily.20080718.gz] hash=4966448873967976448
mze_insert: i=18: adding mze_name=[daily.20080719.gz] hash=6413922602988863488
mze_insert: i=19: adding mze_name=[daily.20080720.gz] hash=5759986962857459712
mze_insert: i=20: adding mze_name=[daily.20080721.gz] hash=5909039301739413504
mze_insert: i=21: adding mze_name=[daily.20080722.gz] hash=8372896562954633216
mze_insert: i=22: adding mze_name=[daily.20080723.gz] hash=7627984238364590080
mze_insert: i=23: adding mze_name=[daily.20080724.gz] hash=4059358240683589632
mze_insert: i=24: adding mze_name=[daily.20080725.gz] hash=2718826723431940096
mze_insert: i=25: adding mze_name=[daily.20080726.gz] hash=254638509216759808
mze_insert: i=26: adding mze_name=[daily.20080727.gz] hash=2190475858316099584
mze_insert: i=27: adding mze_name=[daily.20080728.gz] hash=11573062813869932544
mze_insert: i=28: adding mze_name=[daily.20080729.gz] hash=13651902507838865408
mze_insert: i=29: adding mze_name=[daily.20080730.gz] hash=1423949746464096256
mze_insert: i=30: adding mze_name=[daily.20080731.gz] hash=1021306183190839296
mzap_open: i=31: empty mze_name
mze_insert: i=32: ALREADY EXISTS! mze_name=[daily.20080706.gz]
hash=13533957483210473472
mzap_open: i=33: empty mze_name
mze_insert: i=34: ALREADY EXISTS! mze_name=[daily.20080711.gz]
hash=13147843840310247424
mzap_open: i=35: empty mze_name
mze_insert: i=36: ALREADY EXISTS! mze_name=[daily.20080715.gz]
hash=13964729096542879744
mzap_open: i=37: empty mze_name
mzap_open: i=38: empty mze_name
zpool scrub shows not errors.
Any idea how we ended up in this situation?
If there is ZFS developer interested in tracking it further down, maybe Dmitry
will be able to provide snapshot of this corrupted file system.
--
Pawel Jakub Dawidek http://www.wheel.pl
pjd at FreeBSD.org http://www.FreeBSD.org
FreeBSD committer Am I Evil? Yes, I Am!
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