On Fri, Jul 08, 2022 at 07:21:55PM +0800, Sun Ke wrote:
> Set 256 blocks in a block group, then inject I/O pressure, it will
> trigger off kernel BUG in ext4_mb_mark_diskspace_used.
>
> Regression test for commit a08f789d2ab5 ext4: fix bug_on
> ext4_mb_use_inode_pa.
>
> Signed-off-by: Sun Ke <sunke32@xxxxxxxxxx>
> ---
> tests/ext4/058 | 33 +++++++++++++++++++++++++++++++++
> tests/ext4/058.out | 2 ++
> 2 files changed, 35 insertions(+)
> create mode 100755 tests/ext4/058
> create mode 100644 tests/ext4/058.out
>
> diff --git a/tests/ext4/058 b/tests/ext4/058
> new file mode 100755
> index 00000000..b718c1ac
> --- /dev/null
> +++ b/tests/ext4/058
> @@ -0,0 +1,33 @@
> +#! /bin/bash
> +# SPDX-License-Identifier: GPL-2.0
> +# Copyright (c) 2022 HUAWEI. All Rights Reserved.
> +#
> +# FS QA Test 058
> +#
> +# Set 256 blocks in a block group, then inject I/O pressure,
> +# it will trigger off kernel BUG in ext4_mb_mark_diskspace_used
> +#
> +# Regression test for commit
> +# a08f789d2ab5 ext4: fix bug_on ext4_mb_use_inode_pa
> +#
> +. ./common/preamble
> +_begin_fstest auto
quick ?
> +
> +# real QA test starts here
> +
> +_supported_fs ext4
> +_fixed_by_kernel_commit a08f789d2ab5 \
> + "ext4: fix bug_on ext4_mb_use_inode_pa"
> +_require_scratch
> +
> +# set 256 blocks in a block group
> +_scratch_mkfs -g 256 >>$seqres.full 2>&1 || _fail "mkfs failed"
> +_scratch_mount
> +
> +$FSSTRESS_PROG -d $SCRATCH_MNT/stress -n 1000 >> $seqres.full
Use "2>&1", if you'd like to avoid some fsstress error output break golden image.
BTW, just for make, are you sure this can reproduce that bug? Due to that fix
commit said:
...
we can easily reproduce this problem with the following commands:
`fallocate -l100M disk`
`mkfs.ext4 -b 1024 -g 256 disk`
`mount disk /mnt`
`fsstress -d /mnt -l 0 -n 1000 -p 1`
...
It uses "-l 0" to loop run fsstress until hit the bug. You removed the '-l 0',
so are you sure one round `fsstress -n 1000` is enough to reproduce this bug
stably?
Thanks,
Zorro
> +
> +echo "Silence is golden"
> +
> +# success, all done
> +status=0
> +exit
> diff --git a/tests/ext4/058.out b/tests/ext4/058.out
> new file mode 100644
> index 00000000..fb5ca60b
> --- /dev/null
> +++ b/tests/ext4/058.out
> @@ -0,0 +1,2 @@
> +QA output created by 058
> +Silence is golden
> --
> 2.13.6
>
