Re: [PATCH RFC] xfs: test the deadlock between the AGI and AGF with RENAME_WHITEOUT

[Brian Foster <bfoster@redhat.com>]

On Thu, Oct 17, 2019 at 05:40:51PM +0800, kaixuxia wrote:
> There is ABBA deadlock bug between the AGI and AGF when performing
> rename() with RENAME_WHITEOUT flag, and add this testcase to make
> sure the rename() call works well.
> 
> Signed-off-by: kaixuxia <kaixuxia@tencent.com>
> ---

This runs in about 5-7s on my VM and reproduced the deadlock on the
first try with the kernel fix reverted. Very nice. Thanks for working
this into a cleaner test!

Reviewed-by: Brian Foster <bfoster@redhat.com>

>  tests/generic/579     | 56 +++++++++++++++++++++++++++++++++++++++++++++++++++
>  tests/generic/579.out |  2 ++
>  tests/generic/group   |  1 +
>  3 files changed, 59 insertions(+)
>  create mode 100755 tests/generic/579
>  create mode 100644 tests/generic/579.out
> 
> diff --git a/tests/generic/579 b/tests/generic/579
> new file mode 100755
> index 0000000..d6b0042
> --- /dev/null
> +++ b/tests/generic/579
> @@ -0,0 +1,56 @@
> +#! /bin/bash
> +# SPDX-License-Identifier: GPL-2.0
> +# Copyright (c) 2019 Tencent.  All Rights Reserved.
> +#
> +# FS QA Test No. 579
> +#
> +# Regression test for:
> +#    bc56ad8c74b8: ("xfs: Fix deadlock between AGI and AGF with RENAME_WHITEOUT")
> +#
> +seq=`basename $0`
> +seqres=$RESULT_DIR/$seq
> +echo "QA output created by $seq"
> +
> +here=`pwd`
> +tmp=/tmp/$$
> +status=1        # failure is the default!
> +trap "_cleanup; exit \$status" 0 1 2 3 15
> +
> +_cleanup()
> +{
> +        cd /
> +        rm -f $tmp.*
> +}
> +
> +# get standard environment, filters and checks
> +. ./common/rc
> +. ./common/filter
> +. ./common/renameat2
> +
> +# remove previous $seqres.full before test
> +rm -f $seqres.full
> +
> +# real QA test starts here
> +_supported_os Linux
> +_supported_fs generic
> +_require_scratch
> +_require_renameat2 whiteout
> +
> +_scratch_mkfs > $seqres.full 2>&1 || _fail "mkfs failed"
> +_scratch_mount >> $seqres.full 2>&1
> +
> +# start a create and rename(rename_whiteout) workload. These processes
> +# occur simultaneously may cause the deadlock between AGI and AGF with
> +# RENAME_WHITEOUT.
> +$FSSTRESS_PROG -z -n 100 -p 100 \
> +		-f creat=5 \
> +		-f rwhiteout=5 \
> +		-d $SCRATCH_MNT/fsstress >> $seqres.full 2>&1
> +
> +echo Silence is golden
> +
> +# Failure comes in the form of a deadlock.
> +
> +# success, all done
> +status=0
> +exit
> diff --git a/tests/generic/579.out b/tests/generic/579.out
> new file mode 100644
> index 0000000..06f4633
> --- /dev/null
> +++ b/tests/generic/579.out
> @@ -0,0 +1,2 @@
> +QA output created by 579
> +Silence is golden
> diff --git a/tests/generic/group b/tests/generic/group
> index 6f9c4e1..21870d2 100644
> --- a/tests/generic/group
> +++ b/tests/generic/group
> @@ -581,3 +581,4 @@
>  576 auto quick verity encrypt
>  577 auto quick verity
>  578 auto quick rw clone
> +579 auto rename
> -- 
> 1.8.3.1
> 
> -- 
> kaixuxia