On Sat, Apr 22, 2023 at 09:47:34PM +0530, Ritesh Harjani (IBM) wrote: > This test adds a testcase to catch race condition against > reading of journal_task and parallel unmount. > This patch in kernel fixes this [1] > > ext4_put_super() cat /sys/fs/ext4/loop2/journal_task > | ext4_attr_show(); > ext4_jbd2_journal_destroy(); | > | journal_task_show() > | | > | task_pid_vnr(NULL); > sbi->s_journal = NULL; > > RIP: 0010:__task_pid_nr_ns+0x4d/0xe0 > <...> > Call Trace: > <TASK> > ext4_attr_show+0x1bd/0x3e0 > sysfs_kf_seq_show+0x8e/0x110 > seq_read_iter+0x11b/0x4d0 > vfs_read+0x216/0x2e0 > ksys_read+0x69/0xf0 > do_syscall_64+0x3f/0x90 > entry_SYSCALL_64_after_hwframe+0x72/0xdc > [ > > [1]: https://lore.kernel.org/all/20200318061301.4320-1-riteshh@xxxxxxxxxxxxx/ > Commit: ext4: Unregister sysfs path before destroying jbd2 journal > > Signed-off-by: Ritesh Harjani (IBM) <ritesh.list@xxxxxxxxx> > --- > tests/ext4/061 | 82 ++++++++++++++++++++++++++++++++++++++++++++++ > tests/ext4/061.out | 2 ++ > 2 files changed, 84 insertions(+) > create mode 100755 tests/ext4/061 > create mode 100644 tests/ext4/061.out > > diff --git a/tests/ext4/061 b/tests/ext4/061 > new file mode 100755 > index 00000000..88bf138a > --- /dev/null > +++ b/tests/ext4/061 > @@ -0,0 +1,82 @@ > +#! /bin/bash > +# SPDX-License-Identifier: GPL-2.0 > +# Copyright (c) 2023 IBM Corporation. All Rights Reserved. > +# > +# FS QA Test 061 > +# > +# Regression test for https://lore.kernel.org/all/20200318061301.4320-1-riteshh@xxxxxxxxxxxxx/ > +# ext4: Unregister sysfs path before destroying jbd2 journal The link isn't needed, if you points out the commit id and subject. > +# > + > +. ./common/preamble > +_begin_fstest auto quick > + > +pid_mloop="" > +pids_jloop="" > +trap "_cleanup; exit \$status" 0 1 2 3 15 > +# Override the default cleanup function. > +_cleanup() > +{ > + { > + kill -SIGKILL $pid_mloop $pids_jloop > + wait $pid_mloop $pids_jloop > + } > /dev/null 2>&1 [ -n "$pids_jloop" ] && kill -9 $pids_jloop [ -n "$pid_mloop" ] && kill -9 $pid_mloop wait > + cd / > + rm -r -f $tmp.* > +} > + > +# Import common functions. > +. ./common/filter > + > +# real QA test starts here > + > +# Modify as appropriate. > +_supported_fs ext4 > +_fixed_by_kernel_commit 5e47868fb94b63c \ > + "ext4: unregister sysfs path before destroying jbd2 journal" > +_require_scratch > +_require_fs_sysfs journal_task > + > +_scratch_mkfs_ext4 >> $seqres.full 2>&1 > +# mount filesystem > +_scratch_mount >> $seqres.full 2>&1 > +scratch_dev=$(_short_dev $SCRATCH_DEV) The $scratch_dev is only used in read_journal_task_loop() ... > + > +function mount_loop() > +{ > + while [ 1 ]; do > + _scratch_unmount >> $seqres.full 2>&1 > + sleep 1; > + _scratch_mount >> $seqres.full 2>&1 Do you hope to fail the test directly if the mount fails? Or you hope to use _try_scratch_mount ? > + sleep 1; > + done > +} > + > +function read_journal_task_loop() > +{ > + while [ 1 ]; do > + cat /sys/fs/ext4/$scratch_dev/journal_task > /dev/null 2>&1 ... so I think you can write this line as: cat /sys/fs/ext4/$(_short_dev $SCRATCH_DEV)/journal_task ... BTW, I'm wondering if you need to check the journal_task is supported? > + sleep 1; > + done > +} > + > +mount_loop & > +pid_mloop=$! > + > +for i in $(seq 1 100); do > + read_journal_task_loop & > + pid=$! > + pids_jloop="${pids_jloop} ${pid}" pids_jloop="${pids_jloop} $!" > +done > + > +sleep 20 20 * TIME_FACTOR ? > +{ > + kill -SIGKILL $pid_mloop $pids_jloop > + wait $pid_mloop $pids_jloop > +} > /dev/null 2>&1 kill -9 $pid_mloop $pids_jloop wait $pid_mloop $pids_jloop unset pid_mloop pids_jloop > + > +echo "Silence is golden" > + > +# success, all done > +status=0 > +exit > diff --git a/tests/ext4/061.out b/tests/ext4/061.out > new file mode 100644 > index 00000000..273be9e0 > --- /dev/null > +++ b/tests/ext4/061.out > @@ -0,0 +1,2 @@ > +QA output created by 061 > +Silence is golden > -- > 2.39.2 >
