Hi all,
I run xfstests #239 against mainline 3.10.0-rc3, unfortunately it failure in my QEMU. I run the
case a hundred times, it certainly hit the failure several times. The failure msg is as follow:
FSTYP -- ext4
PLATFORM -- Linux/x86_64 3.10.0-rc3-mainline
generic/239 1s ... - output mismatch (see /home/zhj/xfstests/results/generic/239.out.bad)
--- tests/generic/239.out 2013-06-07 22:04:09.000000000 -0400
+++ /home/zff/xfstests/results/generic/239.out.bad 2013-06-07 22:04:09.000000000 -0400
@@ -1,2 +1,515 @@
QA output created by 239
+hostname: Host name lookup failure
Silence is golden
+0: 0x0
+1: 0x0
+2: 0x0
+3: 0x0
...
I found that from 2.6.39 the test case occur this failure and it is is introduced by this
commit: 198868f35de99e7197829314076e5465c37e4cc5
ext4: Use single thread to perform DIO unwritten convertion
When i revert this patch, the failure seems go away. But when i see
http://oss.sgi.com/archives/xfs/2010-06/msg00269.html, it said that
"This contains core direct I/O changes to allow the filesystem to delay AIO completion,
as well as a patch to fix XFS. ext4 also has the same issue, and from a quick look also
doesn't properly complete unwritten extent conversions for synchronous direct I/O, but
I'll leave that for someone more familar to figure out."
I also run the test against 3.4.24 rt-tree with revert the patch which i found before, but
the hundred times tests all failure.
So, things maybe not simple, i doubt the patch i found isn't the root cause.
Regards,
- Hongjiang
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