Re: [syzbot] [reiserfs?] possible deadlock in super_lock

From: syzbot
Date: Mon Oct 09 2023 - 10:20:02 EST

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Hello,

syzbot has tested the proposed patch but the reproducer is still triggering an issue:
INFO: task hung in blkdev_put

INFO: task syz-executor.1:6676 blocked for more than 143 seconds.
Not tainted 6.6.0-rc5-syzkaller-gb6ab131813c2 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.1 state:D stack:0 pid:6676 ppid:6383 flags:0x00000005
Call trace:
__switch_to+0x320/0x754 arch/arm64/kernel/process.c:556
context_switch kernel/sched/core.c:5382 [inline]
__schedule+0x1364/0x23b4 kernel/sched/core.c:6695
schedule+0xc4/0x170 kernel/sched/core.c:6771
schedule_preempt_disabled+0x18/0x2c kernel/sched/core.c:6830
__mutex_lock_common+0xbd8/0x21a0 kernel/locking/mutex.c:679
__mutex_lock kernel/locking/mutex.c:747 [inline]
mutex_lock_nested+0x2c/0x38 kernel/locking/mutex.c:799
blkdev_put+0xec/0x740 block/bdev.c:884
blkdev_release+0x84/0x9c block/fops.c:604
__fput+0x324/0x7f8 fs/file_table.c:384
__fput_sync+0x60/0x9c fs/file_table.c:465
__do_sys_close fs/open.c:1572 [inline]
__se_sys_close fs/open.c:1557 [inline]
__arm64_sys_close+0x150/0x1e0 fs/open.c:1557
__invoke_syscall arch/arm64/kernel/syscall.c:37 [inline]
invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:51
el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:136
do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:155
el0_svc+0x58/0x16c arch/arm64/kernel/entry-common.c:678
el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:696
el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:595
INFO: task syz-executor.2:6678 blocked for more than 143 seconds.
Not tainted 6.6.0-rc5-syzkaller-gb6ab131813c2 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.2 state:D stack:0 pid:6678 ppid:6377 flags:0x00000005
Call trace:
__switch_to+0x320/0x754 arch/arm64/kernel/process.c:556
context_switch kernel/sched/core.c:5382 [inline]
__schedule+0x1364/0x23b4 kernel/sched/core.c:6695
schedule+0xc4/0x170 kernel/sched/core.c:6771
schedule_preempt_disabled+0x18/0x2c kernel/sched/core.c:6830
__mutex_lock_common+0xbd8/0x21a0 kernel/locking/mutex.c:679
__mutex_lock kernel/locking/mutex.c:747 [inline]
mutex_lock_nested+0x2c/0x38 kernel/locking/mutex.c:799
blkdev_put+0xec/0x740 block/bdev.c:884
blkdev_release+0x84/0x9c block/fops.c:604
__fput+0x324/0x7f8 fs/file_table.c:384
__fput_sync+0x60/0x9c fs/file_table.c:465
__do_sys_close fs/open.c:1572 [inline]
__se_sys_close fs/open.c:1557 [inline]
__arm64_sys_close+0x150/0x1e0 fs/open.c:1557
__invoke_syscall arch/arm64/kernel/syscall.c:37 [inline]
invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:51
el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:136
do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:155
el0_svc+0x58/0x16c arch/arm64/kernel/entry-common.c:678
el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:696
el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:595
INFO: task syz-executor.0:6682 blocked for more than 143 seconds.
Not tainted 6.6.0-rc5-syzkaller-gb6ab131813c2 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.0 state:D stack:0 pid:6682 ppid:6389 flags:0x0000000d
Call trace:
__switch_to+0x320/0x754 arch/arm64/kernel/process.c:556
context_switch kernel/sched/core.c:5382 [inline]
__schedule+0x1364/0x23b4 kernel/sched/core.c:6695
schedule+0xc4/0x170 kernel/sched/core.c:6771
schedule_preempt_disabled+0x18/0x2c kernel/sched/core.c:6830
__mutex_lock_common+0xbd8/0x21a0 kernel/locking/mutex.c:679
__mutex_lock kernel/locking/mutex.c:747 [inline]
mutex_lock_nested+0x2c/0x38 kernel/locking/mutex.c:799
bd_finish_claiming+0x218/0x3dc block/bdev.c:566
blkdev_get_by_dev+0x3f4/0x55c block/bdev.c:799
journal_init_dev fs/reiserfs/journal.c:2616 [inline]
journal_init+0xb08/0x1e68 fs/reiserfs/journal.c:2783
reiserfs_fill_super+0xd58/0x2058 fs/reiserfs/super.c:2029
mount_bdev+0x1e8/0x2b4 fs/super.c:1629
get_super_block+0x44/0x58 fs/reiserfs/super.c:2605
legacy_get_tree+0xd4/0x16c fs/fs_context.c:638
vfs_get_tree+0x90/0x288 fs/super.c:1750
do_new_mount+0x25c/0x8c8 fs/namespace.c:3335
path_mount+0x590/0xe04 fs/namespace.c:3662
do_mount fs/namespace.c:3675 [inline]
__do_sys_mount fs/namespace.c:3884 [inline]
__se_sys_mount fs/namespace.c:3861 [inline]
__arm64_sys_mount+0x45c/0x594 fs/namespace.c:3861
__invoke_syscall arch/arm64/kernel/syscall.c:37 [inline]
invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:51
el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:136
do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:155
el0_svc+0x58/0x16c arch/arm64/kernel/entry-common.c:678
el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:696
el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:595
INFO: task syz-executor.3:6690 blocked for more than 143 seconds.
Not tainted 6.6.0-rc5-syzkaller-gb6ab131813c2 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.3 state:D stack:0 pid:6690 ppid:6373 flags:0x0000000d
Call trace:
__switch_to+0x320/0x754 arch/arm64/kernel/process.c:556
context_switch kernel/sched/core.c:5382 [inline]
__schedule+0x1364/0x23b4 kernel/sched/core.c:6695
schedule+0xc4/0x170 kernel/sched/core.c:6771
super_lock+0x23c/0x328 fs/super.c:134
super_lock_shared fs/super.c:146 [inline]
super_lock_shared_active fs/super.c:1431 [inline]
fs_bdev_sync+0xa4/0x168 fs/super.c:1466
blkdev_flushbuf block/ioctl.c:372 [inline]
blkdev_common_ioctl+0x848/0x2884 block/ioctl.c:502
blkdev_ioctl+0x35c/0xae4 block/ioctl.c:624
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:871 [inline]
__se_sys_ioctl fs/ioctl.c:857 [inline]
__arm64_sys_ioctl+0x14c/0x1c8 fs/ioctl.c:857
__invoke_syscall arch/arm64/kernel/syscall.c:37 [inline]
invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:51
el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:136
do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:155
el0_svc+0x58/0x16c arch/arm64/kernel/entry-common.c:678
el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:696
el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:595
INFO: task syz-executor.3:6695 blocked for more than 143 seconds.
Not tainted 6.6.0-rc5-syzkaller-gb6ab131813c2 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.3 state:D stack:0 pid:6695 ppid:6373 flags:0x00000005
Call trace:
__switch_to+0x320/0x754 arch/arm64/kernel/process.c:556
context_switch kernel/sched/core.c:5382 [inline]
__schedule+0x1364/0x23b4 kernel/sched/core.c:6695
schedule+0xc4/0x170 kernel/sched/core.c:6771
schedule_preempt_disabled+0x18/0x2c kernel/sched/core.c:6830
__mutex_lock_common+0xbd8/0x21a0 kernel/locking/mutex.c:679
__mutex_lock kernel/locking/mutex.c:747 [inline]
mutex_lock_nested+0x2c/0x38 kernel/locking/mutex.c:799
bd_prepare_to_claim+0x1a4/0x49c block/bdev.c:508
loop_configure+0x15c/0xfd4 drivers/block/loop.c:1018
lo_ioctl+0xc70/0x1d04
blkdev_ioctl+0x3e4/0xae4 block/ioctl.c:630
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:871 [inline]
__se_sys_ioctl fs/ioctl.c:857 [inline]
__arm64_sys_ioctl+0x14c/0x1c8 fs/ioctl.c:857
__invoke_syscall arch/arm64/kernel/syscall.c:37 [inline]
invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:51
el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:136
do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:155
el0_svc+0x58/0x16c arch/arm64/kernel/entry-common.c:678
el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:696
el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:595
INFO: task syz-executor.5:6696 blocked for more than 143 seconds.
Not tainted 6.6.0-rc5-syzkaller-gb6ab131813c2 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.5 state:D stack:0 pid:6696 ppid:6381 flags:0x00000005
Call trace:
__switch_to+0x320/0x754 arch/arm64/kernel/process.c:556
context_switch kernel/sched/core.c:5382 [inline]
__schedule+0x1364/0x23b4 kernel/sched/core.c:6695
schedule+0xc4/0x170 kernel/sched/core.c:6771
schedule_preempt_disabled+0x18/0x2c kernel/sched/core.c:6830
__mutex_lock_common+0xbd8/0x21a0 kernel/locking/mutex.c:679
__mutex_lock kernel/locking/mutex.c:747 [inline]
mutex_lock_nested+0x2c/0x38 kernel/locking/mutex.c:799
blkdev_get_by_dev+0x114/0x55c block/bdev.c:786
blkdev_open+0x128/0x2b0 block/fops.c:589
do_dentry_open+0x6fc/0x118c fs/open.c:929
vfs_open+0x7c/0x90 fs/open.c:1063
do_open fs/namei.c:3639 [inline]
path_openat+0x1f2c/0x27f8 fs/namei.c:3796
do_filp_open+0x1bc/0x3cc fs/namei.c:3823
do_sys_openat2+0x124/0x1b8 fs/open.c:1422
do_sys_open fs/open.c:1437 [inline]
__do_sys_openat fs/open.c:1453 [inline]
__se_sys_openat fs/open.c:1448 [inline]
__arm64_sys_openat+0x1f0/0x240 fs/open.c:1448
__invoke_syscall arch/arm64/kernel/syscall.c:37 [inline]
invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:51
el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:136
do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:155
el0_svc+0x58/0x16c arch/arm64/kernel/entry-common.c:678
el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:696
el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:595
INFO: task syz-executor.5:6703 blocked for more than 143 seconds.
Not tainted 6.6.0-rc5-syzkaller-gb6ab131813c2 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.5 state:D stack:0 pid:6703 ppid:6381 flags:0x00000005
Call trace:
__switch_to+0x320/0x754 arch/arm64/kernel/process.c:556
context_switch kernel/sched/core.c:5382 [inline]
__schedule+0x1364/0x23b4 kernel/sched/core.c:6695
schedule+0xc4/0x170 kernel/sched/core.c:6771
schedule_preempt_disabled+0x18/0x2c kernel/sched/core.c:6830
__mutex_lock_common+0xbd8/0x21a0 kernel/locking/mutex.c:679
__mutex_lock kernel/locking/mutex.c:747 [inline]
mutex_lock_nested+0x2c/0x38 kernel/locking/mutex.c:799
bd_prepare_to_claim+0x1a4/0x49c block/bdev.c:508
loop_configure+0x15c/0xfd4 drivers/block/loop.c:1018
lo_ioctl+0xc70/0x1d04
blkdev_ioctl+0x3e4/0xae4 block/ioctl.c:630
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:871 [inline]
__se_sys_ioctl fs/ioctl.c:857 [inline]
__arm64_sys_ioctl+0x14c/0x1c8 fs/ioctl.c:857
__invoke_syscall arch/arm64/kernel/syscall.c:37 [inline]
invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:51
el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:136
do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:155
el0_svc+0x58/0x16c arch/arm64/kernel/entry-common.c:678
el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:696
el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:595
INFO: task syz-executor.4:6698 blocked for more than 143 seconds.
Not tainted 6.6.0-rc5-syzkaller-gb6ab131813c2 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.4 state:D stack:0 pid:6698 ppid:6384 flags:0x00000005
Call trace:
__switch_to+0x320/0x754 arch/arm64/kernel/process.c:556
context_switch kernel/sched/core.c:5382 [inline]
__schedule+0x1364/0x23b4 kernel/sched/core.c:6695
schedule+0xc4/0x170 kernel/sched/core.c:6771
schedule_preempt_disabled+0x18/0x2c kernel/sched/core.c:6830
__mutex_lock_common+0xbd8/0x21a0 kernel/locking/mutex.c:679
__mutex_lock kernel/locking/mutex.c:747 [inline]
mutex_lock_nested+0x2c/0x38 kernel/locking/mutex.c:799
blkdev_get_by_dev+0x114/0x55c block/bdev.c:786
blkdev_open+0x128/0x2b0 block/fops.c:589
do_dentry_open+0x6fc/0x118c fs/open.c:929
vfs_open+0x7c/0x90 fs/open.c:1063
do_open fs/namei.c:3639 [inline]
path_openat+0x1f2c/0x27f8 fs/namei.c:3796
do_filp_open+0x1bc/0x3cc fs/namei.c:3823
do_sys_openat2+0x124/0x1b8 fs/open.c:1422
do_sys_open fs/open.c:1437 [inline]
__do_sys_openat fs/open.c:1453 [inline]
__se_sys_openat fs/open.c:1448 [inline]
__arm64_sys_openat+0x1f0/0x240 fs/open.c:1448
__invoke_syscall arch/arm64/kernel/syscall.c:37 [inline]
invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:51
el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:136
do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:155
el0_svc+0x58/0x16c arch/arm64/kernel/entry-common.c:678
el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:696
el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:595
INFO: task syz-executor.4:6704 blocked for more than 143 seconds.
Not tainted 6.6.0-rc5-syzkaller-gb6ab131813c2 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.4 state:D stack:0 pid:6704 ppid:6384 flags:0x00000005
Call trace:
__switch_to+0x320/0x754 arch/arm64/kernel/process.c:556
context_switch kernel/sched/core.c:5382 [inline]
__schedule+0x1364/0x23b4 kernel/sched/core.c:6695
schedule+0xc4/0x170 kernel/sched/core.c:6771
schedule_preempt_disabled+0x18/0x2c kernel/sched/core.c:6830
__mutex_lock_common+0xbd8/0x21a0 kernel/locking/mutex.c:679
__mutex_lock kernel/locking/mutex.c:747 [inline]
mutex_lock_nested+0x2c/0x38 kernel/locking/mutex.c:799
bd_prepare_to_claim+0x1a4/0x49c block/bdev.c:508
loop_configure+0x15c/0xfd4 drivers/block/loop.c:1018
lo_ioctl+0xc70/0x1d04
blkdev_ioctl+0x3e4/0xae4 block/ioctl.c:630
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:871 [inline]
__se_sys_ioctl fs/ioctl.c:857 [inline]
__arm64_sys_ioctl+0x14c/0x1c8 fs/ioctl.c:857
__invoke_syscall arch/arm64/kernel/syscall.c:37 [inline]
invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:51
el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:136
do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:155
el0_svc+0x58/0x16c arch/arm64/kernel/entry-common.c:678
el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:696
el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:595

Showing all locks held in the system:
1 lock held by khungtaskd/30:
#0: ffff80008e3739c0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0xc/0x44 include/linux/rcupdate.h:302
2 locks held by kworker/u4:6/235:
2 locks held by getty/5770:
#0: ffff0000d6cf20a0 (&tty->ldisc_sem){++++}-{0:0}, at: ldsem_down_read+0x3c/0x4c drivers/tty/tty_ldsem.c:340
#1: ffff8000959f02f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x414/0x1214 drivers/tty/n_tty.c:2206
1 lock held by syz-executor.1/6676:
#0: ffff0000c9ce34c8 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_put+0xec/0x740 block/bdev.c:884
1 lock held by syz-executor.2/6678:
#0: ffff0000c9ce34c8 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_put+0xec/0x740 block/bdev.c:884
3 locks held by syz-executor.0/6682:
#0: ffff0000c9ce34c8 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_get_by_dev+0x114/0x55c block/bdev.c:786
#1: ffff80008e1748a8 (bdev_lock){+.+.}-{3:3}, at: bd_finish_claiming+0x84/0x3dc block/bdev.c:557
#2: ffff0000c1543a88 (&bdev->bd_holder_lock){+.+.}-{3:3}, at: bd_finish_claiming+0x218/0x3dc block/bdev.c:566
1 lock held by syz-executor.3/6690:
#0: ffff0000c1543a88 (&bdev->bd_holder_lock){+.+.}-{3:3}, at: blkdev_flushbuf block/ioctl.c:370 [inline]
#0: ffff0000c1543a88 (&bdev->bd_holder_lock){+.+.}-{3:3}, at: blkdev_common_ioctl+0x7fc/0x2884 block/ioctl.c:502
1 lock held by syz-executor.3/6695:
#0: ffff80008e1748a8 (bdev_lock){+.+.}-{3:3}, at: bd_prepare_to_claim+0x1a4/0x49c block/bdev.c:508
1 lock held by syz-executor.5/6696:
#0: ffff0000c9ce34c8 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_get_by_dev+0x114/0x55c block/bdev.c:786
1 lock held by syz-executor.5/6703:
#0: ffff80008e1748a8 (bdev_lock){+.+.}-{3:3}, at: bd_prepare_to_claim+0x1a4/0x49c block/bdev.c:508
1 lock held by syz-executor.4/6698:
#0: ffff0000c9ce34c8 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_get_by_dev+0x114/0x55c block/bdev.c:786
1 lock held by syz-executor.4/6704:
#0: ffff80008e1748a8 (bdev_lock){+.+.}-{3:3}, at: bd_prepare_to_claim+0x1a4/0x49c block/bdev.c:508
1 lock held by syz-executor.0/6872:
#0: ffff0000c9ce34c8 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_get_by_dev+0x114/0x55c block/bdev.c:786
1 lock held by syz-executor.1/6939:
#0: ffff0000c9ce34c8 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_get_by_dev+0x114/0x55c block/bdev.c:786
1 lock held by syz-executor.1/6940:
#0: ffff80008e1748a8 (bdev_lock){+.+.}-{3:3}, at: bd_prepare_to_claim+0x1a4/0x49c block/bdev.c:508
1 lock held by syz-executor.2/6956:
#0: ffff0000c9ce34c8 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_get_by_dev+0x114/0x55c block/bdev.c:786
1 lock held by syz-executor.2/6957:
#0: ffff80008e1748a8 (bdev_lock){+.+.}-{3:3}, at: bd_prepare_to_claim+0x1a4/0x49c block/bdev.c:508
1 lock held by syz-executor.5/6959:
#0: ffff0000c9ce34c8 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_get_by_dev+0x114/0x55c block/bdev.c:786
1 lock held by syz-executor.5/6960:
#0: ffff80008e1748a8 (bdev_lock){+.+.}-{3:3}, at: bd_prepare_to_claim+0x1a4/0x49c block/bdev.c:508
1 lock held by syz-executor.3/6976:
#0: ffff0000c9ce34c8 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_get_by_dev+0x114/0x55c block/bdev.c:786
1 lock held by syz-executor.3/6977:
#0: ffff80008e1748a8 (bdev_lock){+.+.}-{3:3}, at: bd_prepare_to_claim+0x1a4/0x49c block/bdev.c:508
1 lock held by syz-executor.4/6979:
#0: ffff0000c9ce34c8 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_get_by_dev+0x114/0x55c block/bdev.c:786
1 lock held by syz-executor.4/6980:
#0: ffff80008e1748a8 (bdev_lock){+.+.}-{3:3}, at: bd_prepare_to_claim+0x1a4/0x49c block/bdev.c:508
1 lock held by syz-executor.1/6999:
#0: ffff0000c9ce34c8 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_get_by_dev+0x114/0x55c block/bdev.c:786
1 lock held by syz-executor.1/7000:
#0: ffff80008e1748a8 (bdev_lock){+.+.}-{3:3}, at: bd_prepare_to_claim+0x1a4/0x49c block/bdev.c:508
1 lock held by syz-executor.2/7054:
#0: ffff0000c9ce34c8 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_get_by_dev+0x114/0x55c block/bdev.c:786
1 lock held by syz-executor.2/7055:
#0: ffff80008e1748a8 (bdev_lock){+.+.}-{3:3}, at: bd_prepare_to_claim+0x1a4/0x49c block/bdev.c:508
1 lock held by syz-executor.5/7067:
#0: ffff0000c9ce34c8 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_get_by_dev+0x114/0x55c block/bdev.c:786
1 lock held by syz-executor.5/7068:
#0: ffff80008e1748a8 (bdev_lock){+.+.}-{3:3}, at: bd_prepare_to_claim+0x1a4/0x49c block/bdev.c:508
1 lock held by syz-executor.3/7075:
#0: ffff0000c9ce34c8 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_get_by_dev+0x114/0x55c block/bdev.c:786
1 lock held by syz-executor.3/7078:
#0: ffff80008e1748a8 (bdev_lock){+.+.}-{3:3}, at: bd_prepare_to_claim+0x1a4/0x49c block/bdev.c:508
1 lock held by syz-executor.4/7083:
#0: ffff0000c9ce34c8 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_get_by_dev+0x114/0x55c block/bdev.c:786
1 lock held by syz-executor.4/7084:
#0: ffff80008e1748a8 (bdev_lock){+.+.}-{3:3}, at: bd_prepare_to_claim+0x1a4/0x49c block/bdev.c:508

=============================================

Tested on:

commit: b6ab1318 reiserfs: fix journal device opening
git tree: https://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs.git b4/vfs-fixes-reiserfs
console output: https://syzkaller.appspot.com/x/log.txt?x=125bdcde680000
kernel config: https://syzkaller.appspot.com/x/.config?x=1b8c825e0d5f3f72
dashboard link: https://syzkaller.appspot.com/bug?extid=062317ea1d0a6d5e29e7
compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
userspace arch: arm64

Note: no patches were applied.

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