======================================================
WARNING: possible circular locking dependency detected
syzkaller #0 Tainted: G L
------------------------------------------------------
syz.2.854/9126 is trying to acquire lock:
ffff88801eec1940 ((wq_completion)md_misc){+.+.}-{0:0}, at: touch_wq_lockdep_map+0xb5/0x180 kernel/workqueue.c:4111
but task is already holding lock:
ffffffff8f5547c0 (major_names_lock){+.+.}-{4:4}, at: blk_probe_dev block/genhd.c:885 [inline]
ffffffff8f5547c0 (major_names_lock){+.+.}-{4:4}, at: blk_request_module+0x35/0x2a0 block/genhd.c:901
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #3 (major_names_lock){+.+.}-{4:4}:
__mutex_lock_common kernel/locking/mutex.c:646 [inline]
__mutex_lock+0x19d/0x1550 kernel/locking/mutex.c:821
blk_probe_dev block/genhd.c:885 [inline]
blk_request_module+0x35/0x2a0 block/genhd.c:901
blkdev_get_no_open+0x3f/0xe0 block/bdev.c:870
bdev_file_open_by_dev+0xa0/0x240 block/bdev.c:1091
md_import_device+0x2e9/0x650 drivers/md/md.c:3847
hot_add_disk+0xa7/0x4b0 drivers/md/md.c:7751
md_ioctl+0x1e5e/0x2610 drivers/md/md.c:8511
blkdev_ioctl+0x5e3/0x740 block/ioctl.c:798
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:597 [inline]
__se_sys_ioctl+0xfc/0x170 fs/ioctl.c:583
do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84
entry_SYSCALL_64_after_hwframe+0x77/0x7f
-> #2 (&mddev->reconfig_mutex){+.+.}-{4:4}:
__mutex_lock_common kernel/locking/mutex.c:646 [inline]
__mutex_lock+0x19d/0x1550 kernel/locking/mutex.c:821
mddev_lock_nointr drivers/md/md.h:734 [inline]
md_start_sync+0x179/0x1010 drivers/md/md.c:10275
process_one_work kernel/workqueue.c:3396 [inline]
process_scheduled_works+0xc3d/0x1630 kernel/workqueue.c:3479
worker_thread+0xa47/0xfb0 kernel/workqueue.c:3560
kthread+0x38b/0x480 kernel/kthread.c:436
ret_from_fork+0x514/0xb70 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}:
process_one_work kernel/workqueue.c:3372 [inline]
process_scheduled_works+0xc03/0x1630 kernel/workqueue.c:3479
worker_thread+0xa47/0xfb0 kernel/workqueue.c:3560
kthread+0x38b/0x480 kernel/kthread.c:436
ret_from_fork+0x514/0xb70 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 kernel/locking/lockdep.c:3209 [inline]
check_prevs_add kernel/locking/lockdep.c:3328 [inline]
validate_chain kernel/locking/lockdep.c:3952 [inline]
__lock_acquire+0x164c/0x2de0 kernel/locking/lockdep.c:5288
lock_acquire+0x115/0x350 kernel/locking/lockdep.c:5942
touch_wq_lockdep_map+0xcb/0x180 kernel/workqueue.c:4111
__flush_workqueue+0x148/0x1470 kernel/workqueue.c:4153
md_alloc+0x32/0xf20 drivers/md/md.c:6334
md_alloc_and_put+0x1a/0x1f0 drivers/md/md.c:6423
blk_probe_dev block/genhd.c:888 [inline]
blk_request_module+0x27d/0x2a0 block/genhd.c:-1
blkdev_get_no_open+0x3f/0xe0 block/bdev.c:870
blkdev_open+0x1d7/0x600 block/fops.c:665
do_dentry_open+0x816/0x1380 fs/open.c:996
vfs_open+0x3b/0x340 fs/open.c:1101
do_open fs/namei.c:4837 [inline]
path_openat+0x1443/0x1d60 fs/namei.c:5000
do_file_open+0x23e/0x4a0 fs/namei.c:5029
do_sys_openat2+0x115/0x200 fs/open.c:1417
do_sys_open fs/open.c:1423 [inline]
__do_sys_openat fs/open.c:1439 [inline]
__se_sys_openat fs/open.c:1434 [inline]
__x64_sys_openat+0x138/0x170 fs/open.c:1434
do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
do_syscall_64+0x166/0x520 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.2.854/9126: 1, last CPU#0:
#0: ffffffff8f5547c0 (major_names_lock){+.+.}-{4:4}, at: blk_probe_dev block/genhd.c:885 [inline]
#0: ffffffff8f5547c0 (major_names_lock){+.+.}-{4:4}, at: blk_request_module+0x35/0x2a0 block/genhd.c:901
stack backtrace:
CPU: 0 UID: 0 PID: 9126 Comm: syz.2.854 Tainted: G L syzkaller #0 PREEMPT(full)
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/05/2026
Call Trace:
dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
print_circular_bug+0x2e2/0x300 kernel/locking/lockdep.c:2087
check_noncircular+0x12f/0x150 kernel/locking/lockdep.c:2219
check_prev_add kernel/locking/lockdep.c:3209 [inline]
check_prevs_add kernel/locking/lockdep.c:3328 [inline]
validate_chain kernel/locking/lockdep.c:3952 [inline]
__lock_acquire+0x164c/0x2de0 kernel/locking/lockdep.c:5288
lock_acquire+0x115/0x350 kernel/locking/lockdep.c:5942
touch_wq_lockdep_map+0xcb/0x180 kernel/workqueue.c:4111
__flush_workqueue+0x148/0x1470 kernel/workqueue.c:4153
md_alloc+0x32/0xf20 drivers/md/md.c:6334
md_alloc_and_put+0x1a/0x1f0 drivers/md/md.c:6423
blk_probe_dev block/genhd.c:888 [inline]
blk_request_module+0x27d/0x2a0 block/genhd.c:-1
blkdev_get_no_open+0x3f/0xe0 block/bdev.c:870
blkdev_open+0x1d7/0x600 block/fops.c:665
do_dentry_open+0x816/0x1380 fs/open.c:996
vfs_open+0x3b/0x340 fs/open.c:1101
do_open fs/namei.c:4837 [inline]
path_openat+0x1443/0x1d60 fs/namei.c:5000
do_file_open+0x23e/0x4a0 fs/namei.c:5029
do_sys_openat2+0x115/0x200 fs/open.c:1417
do_sys_open fs/open.c:1423 [inline]
__do_sys_openat fs/open.c:1439 [inline]
__se_sys_openat fs/open.c:1434 [inline]
__x64_sys_openat+0x138/0x170 fs/open.c:1434
do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7ffa9a59e159
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:00007ffa9b437028 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007ffa9a826090 RCX: 00007ffa9a59e159
RDX: 0000000000000000 RSI: 0000200000000a80 RDI: ffffffffffffff9c
RBP: 00007ffa9a63506b R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000003 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffa9a826128 R14: 00007ffa9a826090 R15: 00007fffa90b9648
device: 'md130': device_add
kobject: 'md130' (ffff88802388e960): kobject_add_internal: parent: 'block', set: 'devices'
block md130: No ACPI support
PM: Adding info for No Bus:md130
kobject: 'md130' (ffff88802388e960): kobject_uevent_env
kobject: 'md130' (ffff88802388e960): kobject_uevent_env: uevent_suppress caused the event to drop!
kobject: 'holders' (ffff888052f0a980): kobject_add_internal: parent: 'md130', set: ''
kobject: 'slaves' (ffff888052f0a900): kobject_add_internal: parent: 'md130', set: ''
kobject: 'queue' (ffff888028280388): kobject_add_internal: parent: 'md130', set: ''
debugfs: creating file 'md130'
kobject: 'queue' (ffff888028280388): kobject_uevent_env
kobject: 'queue' (ffff888028280388): kobject_uevent_env: filter function caused the event to drop!
device: '9:130': device_add
kobject: '9:130' (ffff88802a693000): kobject_add_internal: parent: 'bdi', set: 'devices'
bdi 9:130: No ACPI support
PM: Adding info for No Bus:9:130
kobject: '9:130' (ffff88802a693000): kobject_uevent_env
kobject: '9:130' (ffff88802a693000): fill_kobj_path: path = '/devices/virtual/bdi/9:130'
debugfs: creating file '9:130'
debugfs: creating file 'stats'
debugfs: creating file 'wb_stats'
kobject: 'md130' (ffff88802388e960): kobject_uevent_env
kobject: 'md130' (ffff88802388e960): fill_kobj_path: path = '/devices/virtual/block/md130'
kobject: 'md' (ffff88807a3280f0): kobject_add_internal: parent: 'md130', set: ''
kobject: 'md' (ffff88807a3280f0): kobject_uevent_env
kobject: 'md' (ffff88807a3280f0): 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.
kcov: kcov_task_exit: t = ffff888027ad5dc0, kcov->t = ffff888027ad5dc0