Under the last several kernels versions (4.6 and I believe 4.4 and, 4.5) btrfs scrub aborts before completing.
If I boot back into an older kernel (4.1 or 4.3, not sure about 4.2) then it runs to completion without any issues.
Steps to reproduce:
1 - make a raid1 system
2 - run with only one disk for awhile to introduce inconsistency
3 - add the other disk back and run btrfs scrub
The newer kernels will get part way through the scrub and then die. For example, with 4.6
# btrfs scrub status -dR /
scrub status for 61267e7b-e8e3-43e1-99f3-40cb2b004a6a
scrub device /dev/sda3 (id 1) history
scrub started at Thu May 26 10:59:31 2016 and was aborted after 00:02:23
data_extents_scrubbed: 256140
tree_extents_scrubbed: 35016
data_bytes_scrubbed: 14865694720
tree_bytes_scrubbed: 573702144
read_errors: 0
csum_errors: 0
verify_errors: 0
no_csum: 2032
csum_discards: 0
super_errors: 0
malloc_errors: 0
uncorrectable_errors: 0
unverified_errors: 0
corrected_errors: 0
last_physical: 16004874240
scrub device /dev/sdb3 (id 2) history
scrub started at Thu May 26 10:59:31 2016 and was aborted after 00:02:35
data_extents_scrubbed: 256139
tree_extents_scrubbed: 35016
data_bytes_scrubbed: 14865690624
tree_bytes_scrubbed: 573702144
read_errors: 0
csum_errors: 205
verify_errors: 24
no_csum: 2032
csum_discards: 0
super_errors: 0
malloc_errors: 0
uncorrectable_errors: 0
unverified_errors: 0
corrected_errors: 229
last_physical: 15984951296
The kernel logs show nothing other than the standard "no csum found for inode ..." and "parent transid verify failed ..." messages
Then booting back into 4.3 and rerunning the scrub.
# btrfs scrub start -BdR /
scrub device /dev/sda3 (id 1) done
scrub started at Thu May 26 11:43:00 2016 and finished after 00:56:25
data_extents_scrubbed: 6939254
tree_extents_scrubbed: 68269
data_bytes_scrubbed: 426809974784
tree_bytes_scrubbed: 1118519296
read_errors: 0
csum_errors: 0
verify_errors: 0
no_csum: 62895
csum_discards: 0
super_errors: 0
malloc_errors: 0
uncorrectable_errors: 0
unverified_errors: 0
corrected_errors: 0
last_physical: 482390048768
scrub device /dev/sdb3 (id 2) done
scrub started at Thu May 26 11:43:00 2016 and finished after 00:58:41
data_extents_scrubbed: 6939240
tree_extents_scrubbed: 68118
data_bytes_scrubbed: 426809335808
tree_bytes_scrubbed: 1116045312
read_errors: 0
csum_errors: 1051510
verify_errors: 0
no_csum: 62767
csum_discards: 0
super_errors: 0
malloc_errors: 0
uncorrectable_errors: 0
unverified_errors: 0
corrected_errors: 1051510
last_physical: 482390048768
WARNING: errors detected during scrubbing, corrected
Cheers! -Tyson
PS: This is with version 4.4 of the btrfs progs and Debian kernel release 4.1, 4.3, 4.4, 4.5, and 4.6.
--
Tyson Whitehead
HPC Programming Specialist
Compute Canada (SHARCNET)
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