On Tue, Sep 16, 2014 at 11:32:11PM -0500, Eric Sandeen wrote:
> On 9/16/14 8:41 PM, Dave Chinner wrote:
> > This test exposed a problem with mapped writes to the tail page of a
> > file in XFS and potentially ext4. Eric did all the hard work of
> > taking the bug report and generating the reproducable test case
> > on ext4, but I haven't been able to reproduce then problem on ext4.
>
> Hm, not even w/ the last test case below, on the byte boundaries?
Sorry, I forgot to rewrite that once I got the byte boundary test
from you. It does, indeed, fail on ext4 as does the previous
mmap/truncate test:
$ sudo MKFS_OPTIONS="-b 1024" ./check generic/029 generic/03[01]
FSTYP -- ext4
PLATFORM -- Linux/x86_64 test4 3.17.0-rc4-dgc+
MKFS_OPTIONS -- -b 1024 /dev/ram1
MOUNT_OPTIONS -- -o acl,user_xattr /dev/ram1 /mnt/scr
generic/029 2s ... - output mismatch (see /home/dave/src/xfstests-dev/results//generic/029.out.bad)
--- tests/generic/029.out 2014-09-17 10:33:15.000000000 +1000
+++ /home/dave/src/xfstests-dev/results//generic/029.out.bad 2014-09-17 14:50:02.000000000 +1000
@@ -10,7 +10,9 @@
==== Post-Remount ==
00000000 58 58 58 58 58 58 58 58 58 58 58 58 58 58 58 58 |XXXXXXXXXXXXXXXX|
*
-00000800 59 59 59 59 59 59 59 59 59 59 59 59 59 59 59 59 |YYYYYYYYYYYYYYYY|
+00000800 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
+*
+00001000 59 59 59 59 59 59 59 59 59 59 59 59 59 59 59 59 |YYYYYYYYYYYYYYYY|
...
(Run 'diff -u tests/generic/029.out /home/dave/src/xfstests-dev/results//generic/029.out.bad' to see the entire diff)
generic/030 1s ... - output mismatch (see /home/dave/src/xfstests-dev/results//generic/030.out.bad)
--- tests/generic/030.out 2014-09-17 11:13:55.000000000 +1000
+++ /home/dave/src/xfstests-dev/results//generic/030.out.bad 2014-09-17 14:50:03.000000000 +1000
@@ -10,7 +10,7 @@
==== Post-Remount ==
00000000 58 58 58 58 58 58 58 58 58 58 58 58 58 58 58 58 |XXXXXXXXXXXXXXXX|
*
-004e6400 59 59 59 59 59 59 59 59 59 59 59 59 59 59 59 59 |YYYYYYYYYYYYYYYY|
+004e6400 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
*
004e7000
...
(Run 'diff -u tests/generic/030.out /home/dave/src/xfstests-dev/results//generic/030.out.bad' to see the entire diff)
generic/031 2s ... 2s
Ran: generic/029 generic/030 generic/031
Failures: generic/029 generic/030
Failed 2 of 3 tests
> FWIW, I think I can simplify that one - the repeated ops aren't
> necessary. Probably no need to carry that along if they aren't
> relevant to the bug.
>
> I'll look at this more closely tomorrow, thanks for encapsulating
> this in an xfstest.
Can you send any updates as delta patches to this one?
Cheers,
Dave.
--
Dave Chinner
david@xxxxxxxxxxxxx
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