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xfs: fuzz every field of every structure

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Previously, our XFS fuzzing efforts were limited to using the xfs_db
blocktrash command to scribble garbage all over a block.  This is
pretty easy to discover; it would be far more interesting if we could
fuzz individual fields looking for unhandled corner cases.  Since we
now have an online scrub tool, use it to check for our targeted
corruptions prior to the usual steps of writing to the FS, taking it
offline, repairing, and re-checking.

These tests use the new xfs_db 'fuzz' command to test corner case
handling of every field.  The 'print' command tells us which fields
are available, and the fuzz command can write zeroes or ones to the
field; set the high, middle, or low bit; add or subtract numbers; or
randomize the field.  We loop through all fields and all fuzz verbs to
see if we can trip up the kernel.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Eryu Guan <eguan@redhat.com>
Signed-off-by: Eryu Guan <eguan@redhat.com>
This commit is contained in:
Darrick J. Wong
2017-01-21 00:11:21 -08:00
committed by Eryu Guan
parent 898e0cf2a4
commit f5f0c11a67
144 changed files with 4908 additions and 0 deletions
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tests/ext4/group
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@@ -25,6 +25,7 @@
020 auto quick ioctl rw
021 auto quick
022 auto quick attr dangerous
023 auto quick scrub
271 auto rw quick
301 aio auto ioctl rw stress
302 aio auto ioctl rw stress