diff options
| author | Baokun Li <libaokun1@huawei.com> | 2023-11-24 19:53:56 +0800 |
|---|---|---|
| committer | Zorro Lang <zlang@kernel.org> | 2023-12-10 21:38:00 +0800 |
| commit | b05c808ce4a4686b40c4e0b5029cb889c39f3856 (patch) | |
| tree | 05dc88745f4e295d1c92b8eec544523492cb027f | |
| parent | c71b4e6203752cb4c54b5ae63f5197076070726b (diff) | |
| download | xfstests-dev-b05c808ce4a4686b40c4e0b5029cb889c39f3856.tar.gz | |
generic: regression test of ext4_lblk_t overflow
Append writes to a file with logical block numbers close to 0xffffffff and
observe if a kernel crash is caused by ext4_lblk_t overflow triggering
BUG_ON at ext4_mb_new_inode_pa(). This is a regression test for commit
bc056e7163ac ("ext4: fix BUG in ext4_mb_new_inode_pa() due to overflow")
Signed-off-by: Baokun Li <libaokun1@huawei.com>
Reviewed-by: Zorro Lang <zlang@redhat.com>
Reviewed-by: "Darrick J. Wong" <djwong@kernel.org>
Signed-off-by: Zorro Lang <zlang@kernel.org>
| -rwxr-xr-x | tests/generic/735 | 54 | ||||
| -rw-r--r-- | tests/generic/735.out | 2 |
2 files changed, 56 insertions, 0 deletions
diff --git a/tests/generic/735 b/tests/generic/735 new file mode 100755 index 0000000000..44b454771d --- /dev/null +++ b/tests/generic/735 @@ -0,0 +1,54 @@ +#! /bin/bash +# SPDX-License-Identifier: GPL-2.0 +# Copyright (c) 2023 HUAWEI. All Rights Reserved. +# +# FS QA Test No. 735 +# +# Append writes to a file with logical block numbers close to 0xffffffff +# and observe if a kernel crash is caused by ext4_lblk_t overflow triggering +# BUG_ON at ext4_mb_new_inode_pa(). This is a regression test for commit +# bc056e7163ac ("ext4: fix BUG in ext4_mb_new_inode_pa() due to overflow") +# +. ./common/preamble +. ./common/populate +_begin_fstest auto quick insert prealloc + +# real QA test starts here +[[ "$FSTYP" =~ ext[0-9]+ ]] && _fixed_by_kernel_commit bc056e7163ac \ + "ext4: fix BUG in ext4_mb_new_inode_pa() due to overflow" + +_require_odirect +_require_xfs_io_command "falloc" +_require_xfs_io_command "finsert" + +dev_size=$((80 * 1024 * 1024)) +_scratch_mkfs_sized $dev_size >>$seqres.full 2>&1 || _fail "mkfs failed" + +_scratch_mount +file_blksz="$(_get_file_block_size ${SCRATCH_MNT})" + +# Reserve 1M space +$XFS_IO_PROG -f -c "falloc 0 1M" "${SCRATCH_MNT}/tmp" >> $seqres.full + +# Create a file with logical block numbers close to 0xffffffff +$XFS_IO_PROG -f -c "falloc 0 10M" "${SCRATCH_MNT}/file" >> $seqres.full +max_pos=$(( 0xffffffff * file_blksz )) +finsert_len=$(( max_pos - ((10 + 2) << 20) )) +$XFS_IO_PROG -f -c "finsert 1M ${finsert_len}" "${SCRATCH_MNT}/file" >> $seqres.full + +# Filling up the free space ensures that the pre-allocated space is the reserved space. +nr_free=$(stat -f -c '%f' ${SCRATCH_MNT}) +_fill_fs $((nr_free * file_blksz)) ${SCRATCH_MNT}/fill $file_blksz 0 >> $seqres.full 2>&1 +sync + +# Remove reserved space to gain free space for allocation +rm -f ${SCRATCH_MNT}/tmp + +# Trying to allocate two blocks triggers BUG_ON. +$XFS_IO_PROG -c "open -ad ${SCRATCH_MNT}/file" -c "pwrite -S 0xff 0 $((2 * file_blksz))" >> $seqres.full + +echo "Silence is golden" + +# success, all done +status=0 +exit diff --git a/tests/generic/735.out b/tests/generic/735.out new file mode 100644 index 0000000000..92df092c05 --- /dev/null +++ b/tests/generic/735.out @@ -0,0 +1,2 @@ +QA output created by 735 +Silence is golden |