From: Ritesh Harjani <riteshh@xxxxxxxxxxxxx> Add another falloc test entry which could hit a kernel bug with ext4 fast_commit feature w/o below kernel commit [1]. <log> [ 410.888496][ T2743] BUG: KASAN: use-after-free in ext4_mb_mark_bb+0x26a/0x6c0 [ 410.890432][ T2743] Read of size 8 at addr ffff888171886000 by task mount/2743 This happens when falloc -k size is huge which spans across more than 1 flex block group in ext4. This causes a bug in fast_commit replay code which is fixed by kernel commit at [1]. [1]: https://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4.git/commit/?h=dev&id=bfdc502a4a4c058bf4cbb1df0c297761d528f54d Signed-off-by: Ritesh Harjani <riteshh@xxxxxxxxxxxxx> --- tests/generic/468 | 8 ++++++++ tests/generic/468.out | 2 ++ 2 files changed, 10 insertions(+) diff --git a/tests/generic/468 b/tests/generic/468 index 95752d3b..5e73cff9 100755 --- a/tests/generic/468 +++ b/tests/generic/468 @@ -34,6 +34,13 @@ _scratch_mkfs >/dev/null 2>&1 _require_metadata_journaling $SCRATCH_DEV _scratch_mount +# blocksize and fact are used in the last case of the fsync/fdatasync test. +# This is mainly trying to test recovery operation in case where the data +# blocks written, exceeds the default flex group size (32768*4096*16) in ext4. +blocks=32768 +blocksize=4096 +fact=18 + testfile=$SCRATCH_MNT/testfile # check inode metadata after shutdown @@ -85,6 +92,7 @@ for i in fsync fdatasync; do test_falloc $i "-k " 1024 test_falloc $i "-k " 4096 test_falloc $i "-k " 104857600 + test_falloc $i "-k " $(($blocks*$blocksize*$fact)) done status=0 diff --git a/tests/generic/468.out b/tests/generic/468.out index b3a28d5e..a09cedb8 100644 --- a/tests/generic/468.out +++ b/tests/generic/468.out @@ -5,9 +5,11 @@ QA output created by 468 ==== falloc -k 1024 test with fsync ==== ==== falloc -k 4096 test with fsync ==== ==== falloc -k 104857600 test with fsync ==== +==== falloc -k 2415919104 test with fsync ==== ==== falloc 1024 test with fdatasync ==== ==== falloc 4096 test with fdatasync ==== ==== falloc 104857600 test with fdatasync ==== ==== falloc -k 1024 test with fdatasync ==== ==== falloc -k 4096 test with fdatasync ==== ==== falloc -k 104857600 test with fdatasync ==== +==== falloc -k 2415919104 test with fdatasync ==== -- 2.31.1
