======================================================
WARNING: possible circular locking dependency detected
syzkaller #0 Not tainted
------------------------------------------------------
syz.1.584/7265 is trying to acquire lock:
ffff88801d3f0940 ((wq_completion)md_misc){+.+.}-{0:0}, at: touch_wq_lockdep_map+0x9c/0x1c0 kernel/workqueue.c:4111
but task is already holding lock:
ffffffff8f9bac60 (major_names_lock){+.+.}-{4:4}, at: blk_probe_dev+0x28/0x1e0 block/genhd.c:885
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #3 (major_names_lock){+.+.}-{4:4}:
lock_acquire kernel/locking/lockdep.c:5942 [inline]
lock_acquire+0x1d1/0x380 kernel/locking/lockdep.c:5899
__mutex_lock_common kernel/locking/mutex.c:646 [inline]
__mutex_lock+0x1a4/0x1bd0 kernel/locking/mutex.c:821
blk_probe_dev+0x28/0x1e0 block/genhd.c:885
blk_request_module+0x16/0xc0 block/genhd.c:901
blkdev_get_no_open+0x9b/0xf0 block/bdev.c:870
bdev_file_open_by_dev block/bdev.c:1091 [inline]
bdev_file_open_by_dev+0x70/0x210 block/bdev.c:1079
md_import_device+0x120/0x360 drivers/md/md.c:3847
md_add_new_disk+0xcc0/0x1820 drivers/md/md.c:7549
md_ioctl+0x2bec/0x36d0 drivers/md/md.c:8499
blkdev_ioctl+0x5ad/0x6f0 block/ioctl.c:798
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:597 [inline]
__se_sys_ioctl fs/ioctl.c:583 [inline]
__x64_sys_ioctl+0x18e/0x210 fs/ioctl.c:583
do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
do_syscall_64+0x123/0x790 arch/x86/entry/syscall_64.c:84
entry_SYSCALL_64_after_hwframe+0x77/0x7f
-> #2 (&mddev->reconfig_mutex){+.+.}-{4:4}:
lock_acquire kernel/locking/lockdep.c:5942 [inline]
lock_acquire+0x1d1/0x380 kernel/locking/lockdep.c:5899
__mutex_lock_common kernel/locking/mutex.c:646 [inline]
__mutex_lock+0x1a4/0x1bd0 kernel/locking/mutex.c:821
mddev_lock_nointr drivers/md/md.h:734 [inline]
md_start_sync+0xc4/0xea0 drivers/md/md.c:10275
process_one_work+0xac7/0x1b10 kernel/workqueue.c:3396
process_scheduled_works kernel/workqueue.c:3479 [inline]
worker_thread+0x5ef/0xe50 kernel/workqueue.c:3560
kthread+0x373/0x450 kernel/kthread.c:436
ret_from_fork+0x730/0xd60 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
-> #1 ((work_completion)(&mddev->sync_work)){+.+.}-{0:0}:
lock_acquire kernel/locking/lockdep.c:5942 [inline]
lock_acquire+0x1d1/0x380 kernel/locking/lockdep.c:5899
process_one_work+0xa32/0x1b10 kernel/workqueue.c:3372
process_scheduled_works kernel/workqueue.c:3479 [inline]
worker_thread+0x5ef/0xe50 kernel/workqueue.c:3560
kthread+0x373/0x450 kernel/kthread.c:436
ret_from_fork+0x730/0xd60 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
-> #0 ((wq_completion)md_misc){+.+.}-{0:0}:
check_prev_add+0xeb/0xe60 kernel/locking/lockdep.c:3209
check_prevs_add kernel/locking/lockdep.c:3328 [inline]
validate_chain kernel/locking/lockdep.c:3952 [inline]
__lock_acquire+0x1528/0x1f40 kernel/locking/lockdep.c:5288
lock_acquire kernel/locking/lockdep.c:5942 [inline]
lock_acquire+0x1d1/0x380 kernel/locking/lockdep.c:5899
touch_wq_lockdep_map+0xad/0x1c0 kernel/workqueue.c:4111
__flush_workqueue+0x131/0x1200 kernel/workqueue.c:4153
md_alloc+0x30/0x10a0 drivers/md/md.c:6334
md_alloc_and_put drivers/md/md.c:6423 [inline]
md_probe drivers/md/md.c:6439 [inline]
md_probe+0x73/0xf0 drivers/md/md.c:6434
blk_probe_dev+0x149/0x1e0 block/genhd.c:888
blk_request_module+0x16/0xc0 block/genhd.c:901
blkdev_get_no_open+0x9b/0xf0 block/bdev.c:870
bdev_file_open_by_dev block/bdev.c:1091 [inline]
bdev_file_open_by_dev+0x70/0x210 block/bdev.c:1079
swsusp_check+0x72/0x470 kernel/power/swap.c:1574
software_resume+0x6f/0x330 kernel/power/hibernate.c:1023
resume_store+0x248/0x460 kernel/power/hibernate.c:1307
kobj_attr_store+0x58/0x80 lib/kobject.c:842
sysfs_kf_write+0xf2/0x150 fs/sysfs/file.c:145
kernfs_fop_write_iter+0x3e0/0x5f0 fs/kernfs/file.c:345
new_sync_write fs/read_write.c:595 [inline]
vfs_write+0x6af/0x1050 fs/read_write.c:687
ksys_write+0x12a/0x250 fs/read_write.c:739
do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
do_syscall_64+0x123/0x790 arch/x86/entry/syscall_64.c:84
entry_SYSCALL_64_after_hwframe+0x77/0x7f
other info that might help us debug this:
Chain exists of:
(wq_completion)md_misc --> &mddev->reconfig_mutex --> major_names_lock
Possible unsafe locking scenario:
CPU0 CPU1
---- ----
lock(major_names_lock);
lock(&mddev->reconfig_mutex);
lock(major_names_lock);
lock((wq_completion)md_misc);
*** DEADLOCK ***
locks held by syz.1.584/7265: 6, last CPU#3:
#0: ffff888025e9b270 (&f->f_pos_lock){+.+.}-{4:4}, at: fdget_pos+0x2aa/0x380 fs/file.c:1259
#1: ffff88802db64460 (sb_writers#8){.+.+}-{0:0}, at: ksys_write+0x12a/0x250 fs/read_write.c:739
#2: ffff88802cee0c80 (&of->mutex){+.+.}-{4:4}, at: kernfs_fop_write_iter+0x2c2/0x5f0 fs/kernfs/file.c:336
#3: ffff88801cb4ec38 (kn->active#65){.+.+}-{0:0}, at: kernfs_get_active_of fs/kernfs/file.c:73 [inline]
#3: ffff88801cb4ec38 (kn->active#65){.+.+}-{0:0}, at: kernfs_fop_write_iter+0x332/0x5f0 fs/kernfs/file.c:337
#4: ffffffff8eca2900 (system_transition_mutex){+.+.}-{4:4}, at: software_resume+0x65/0x330 kernel/power/hibernate.c:1022
#5: ffffffff8f9bac60 (major_names_lock){+.+.}-{4:4}, at: blk_probe_dev+0x28/0x1e0 block/genhd.c:885
stack backtrace:
CPU: 3 UID: 0 PID: 7265 Comm: syz.1.584 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
Call Trace:
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x100/0x190 lib/dump_stack.c:120
print_circular_bug.cold+0x178/0x1be kernel/locking/lockdep.c:2087
check_noncircular+0x146/0x160 kernel/locking/lockdep.c:2219
check_prev_add+0xeb/0xe60 kernel/locking/lockdep.c:3209
check_prevs_add kernel/locking/lockdep.c:3328 [inline]
validate_chain kernel/locking/lockdep.c:3952 [inline]
__lock_acquire+0x1528/0x1f40 kernel/locking/lockdep.c:5288
lock_acquire kernel/locking/lockdep.c:5942 [inline]
lock_acquire+0x1d1/0x380 kernel/locking/lockdep.c:5899
touch_wq_lockdep_map+0xad/0x1c0 kernel/workqueue.c:4111
__flush_workqueue+0x131/0x1200 kernel/workqueue.c:4153
md_alloc+0x30/0x10a0 drivers/md/md.c:6334
md_alloc_and_put drivers/md/md.c:6423 [inline]
md_probe drivers/md/md.c:6439 [inline]
md_probe+0x73/0xf0 drivers/md/md.c:6434
blk_probe_dev+0x149/0x1e0 block/genhd.c:888
blk_request_module+0x16/0xc0 block/genhd.c:901
blkdev_get_no_open+0x9b/0xf0 block/bdev.c:870
bdev_file_open_by_dev block/bdev.c:1091 [inline]
bdev_file_open_by_dev+0x70/0x210 block/bdev.c:1079
swsusp_check+0x72/0x470 kernel/power/swap.c:1574
software_resume+0x6f/0x330 kernel/power/hibernate.c:1023
resume_store+0x248/0x460 kernel/power/hibernate.c:1307
kobj_attr_store+0x58/0x80 lib/kobject.c:842
sysfs_kf_write+0xf2/0x150 fs/sysfs/file.c:145
kernfs_fop_write_iter+0x3e0/0x5f0 fs/kernfs/file.c:345
new_sync_write fs/read_write.c:595 [inline]
vfs_write+0x6af/0x1050 fs/read_write.c:687
ksys_write+0x12a/0x250 fs/read_write.c:739
do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
do_syscall_64+0x123/0x790 arch/x86/entry/syscall_64.c:84
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f258439e159
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f25851ac028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f2584625fa0 RCX: 00007f258439e159
RDX: 0000000000000012 RSI: 0000200000000040 RDI: 0000000000000004
RBP: 00007f258443506b R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f2584626038 R14: 00007f2584625fa0 R15: 00007ffce09b6758
device: 'md32': device_add
kobject: 'md32' (ffff88802971dde0): kobject_add_internal: parent: 'block', set: 'devices'
block md32: No ACPI support
PM: Adding info for No Bus:md32
kobject: 'md32' (ffff88802971dde0): kobject_uevent_env
kobject: 'md32' (ffff88802971dde0): kobject_uevent_env: uevent_suppress caused the event to drop!
kobject: 'holders' (ffff888058abcf80): kobject_add_internal: parent: 'md32', set: ''
kobject: 'slaves' (ffff888026a48c00): kobject_add_internal: parent: 'md32', set: ''
kobject: 'queue' (ffff8880234b6388): kobject_add_internal: parent: 'md32', set: ''
debugfs: creating file 'md32'
kobject: 'queue' (ffff8880234b6388): kobject_uevent_env
kobject: 'queue' (ffff8880234b6388): kobject_uevent_env: filter function caused the event to drop!
device: '9:32': device_add
kobject: '9:32' (ffff88802728d000): kobject_add_internal: parent: 'bdi', set: 'devices'
bdi 9:32: No ACPI support
PM: Adding info for No Bus:9:32
kobject: '9:32' (ffff88802728d000): kobject_uevent_env
kobject: '9:32' (ffff88802728d000): fill_kobj_path: path = '/devices/virtual/bdi/9:32'
debugfs: creating file '9:32'
debugfs: creating file 'stats'
debugfs: creating file 'wb_stats'
kobject: 'md32' (ffff88802971dde0): kobject_uevent_env
kobject: 'md32' (ffff88802971dde0): fill_kobj_path: path = '/devices/virtual/block/md32'
kobject: 'md' (ffff8880277f20f0): kobject_add_internal: parent: 'md32', set: ''
kobject: 'md' (ffff8880277f20f0): kobject_uevent_env
kobject: 'md' (ffff8880277f20f0): kobject_uevent_env: filter function caused the event to drop!
md: async del_gendisk mode will be removed in future, please upgrade to mdadm-4.5+
block device autoloading is deprecated and will be removed.
PM: Image not found (code -5)
PM: hibernation: Hibernation image not present or could not be loaded.
kcov: kcov_task_exit: t = ffff888036ec2580, kcov->t = ffff888036ec2580