[QUESTION] xfstest generic/015 run failed

[QUESTION] xfstest generic/015 run failed

[Dai Xiang]

Hi! I test on my host and find below issue, i want to know how can fix it?

root@ubuntu ~/xfstests# ./check generic/015
FSTYP         -- btrfs
PLATFORM      -- Linux/x86_64 ubuntu 4.12.0-rc6
MKFS_OPTIONS  -- /dev/sda2
MOUNT_OPTIONS -- /dev/sda2 /fs/scratch

generic/015     - output mismatch (see ~/xfstests/results//generic/015.out.bad)
    --- tests/generic/015.out    2017-05-31 18:15:23.000000000 +0800
    +++ ~/xfstests/results//generic/015.out.bad    2017-06-28 10:12:11.001630002 +0800
    @@ -4,4 +4,5 @@
     check free space:
     delete fill:
     check free space:
    -   !!! free space is in range
    +   !!! free space has value of 17348
    +free space is NOT in range 45591.48 .. 46512.52
    ...
    (Run 'diff -u tests/generic/015.out ~/xfstests/results//generic/015.out.bad'  to see the entire diff)
Ran: generic/015
Failures: generic/015
Failed 1 of 1 tests

I print _free to log and find after rm, the space do not free:

root@ubuntu ~/xfstests# cat log
/dev/sda2      btrfs       51200 16416     46052      27% /fs/scratch
46052
/dev/sda2      btrfs       51200 46144     17348      73% /fs/scratch
17348
/dev/sda2      btrfs       51200 46144     17348      73% /fs/scratch
17348

It makes me confused, and i am sure the file has removed and can not create size over 17348 file.
Is it a bug or something wrong with my host?

Thanks
Dai Xiang

Re: [QUESTION] xfstest generic/015 run failed

[Nikolay Borisov]

On 28.06.2017 08:59, Dai Xiang wrote:
> Hi! I test on my host and find below issue, i want to know how can fix it?
> 
> root@ubuntu ~/xfstests# ./check generic/015
> FSTYP         -- btrfs
> PLATFORM      -- Linux/x86_64 ubuntu 4.12.0-rc6

I don't observe this failure on rc6/rc7

Re: [QUESTION] xfstest generic/015 run failed

[David Sterba]

On Wed, Jun 28, 2017 at 01:59:14PM +0800, Dai Xiang wrote:
> Hi! I test on my host and find below issue, i want to know how can fix it?

The test purpose would need to be better defined, the file header says
"check out-of-space behaviour". Not really helpful.  The test script
creates a 50MB filesystem, fills it, removes the file and compares what
'df' reports. The test result can change depending eg. on the mkfs
options, if compression is enabled. So if the test fails, it does not
tell us much. I would not worry about it.