======================================================
WARNING: possible circular locking dependency detected
syzkaller #0 Not tainted
------------------------------------------------------
syz.0.2189/14116 is trying to acquire lock:
ffffffff9132b460 (disks_mutex){+.+.}-{4:4}, at: md_alloc+0x40/0xf40 drivers/md/md.c:6355
but task is already holding lock:
ffffffff9096c960 (major_names_lock){+.+.}-{4:4}, at: blk_probe_dev block/genhd.c:885 [inline]
ffffffff9096c960 (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:
-> #2 (major_names_lock){+.+.}-{4:4}:
__mutex_lock_common kernel/locking/mutex.c:646 [inline]
__mutex_lock+0x197/0x15a0 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:3861
new_dev_store+0x46d/0x860 drivers/md/md.c:-1
md_attr_store+0x3b7/0x640 drivers/md/md.c:6177
kernfs_fop_write_iter+0x3a4/0x540 fs/kernfs/file.c:345
new_sync_write fs/read_write.c:595 [inline]
vfs_write+0x612/0xba0 fs/read_write.c:687
ksys_write+0x150/0x270 fs/read_write.c:1036
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
-> #1 (&mddev->reconfig_mutex){+.+.}-{4:4}:
__mutex_lock_common kernel/locking/mutex.c:646 [inline]
__mutex_lock+0x197/0x15a0 kernel/locking/mutex.c:821
mddev_lock_nointr drivers/md/md.h:734 [inline]
md_alloc+0x81e/0xf40 drivers/md/md.c:6413
md_alloc_and_put+0x1a/0x1f0 drivers/md/md.c:6452
add_named_array+0x240/0x350 drivers/md/md.c:-1
param_attr_store+0x214/0x310 kernel/params.c:598
module_attr_store+0x65/0x90 kernel/params.c:920
kernfs_fop_write_iter+0x3a4/0x540 fs/kernfs/file.c:345
new_sync_write fs/read_write.c:595 [inline]
vfs_write+0x612/0xba0 fs/read_write.c:687
ksys_write+0x150/0x270 fs/read_write.c:1036
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
-> #0 (disks_mutex){+.+.}-{4:4}:
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
__mutex_lock_common kernel/locking/mutex.c:646 [inline]
__mutex_lock+0x197/0x15a0 kernel/locking/mutex.c:821
md_alloc+0x40/0xf40 drivers/md/md.c:6355
md_alloc_and_put+0x1a/0x1f0 drivers/md/md.c:6452
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:678
do_dentry_open+0x80e/0x1360 fs/open.c:1000
vfs_open_consume+0x4a/0x350 fs/open.c:1131
do_open fs/namei.c:4851 [inline]
path_openat+0x16fc/0x20f0 fs/namei.c:5016
do_file_open+0x23e/0x4a0 fs/namei.c:5045
do_sys_openat2+0x115/0x200 fs/open.c:1442
do_sys_open fs/open.c:1448 [inline]
__do_sys_openat fs/open.c:1788 [inline]
__se_sys_openat fs/open.c:1783 [inline]
__x64_sys_openat+0x138/0x170 fs/open.c:1783
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:
disks_mutex --> &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(disks_mutex);
*** DEADLOCK ***
locks held by syz.0.2189/14116: 1, last CPU#1:
#0: ffffffff9096c960 (major_names_lock){+.+.}-{4:4}, at: blk_probe_dev block/genhd.c:885 [inline]
#0: ffffffff9096c960 (major_names_lock){+.+.}-{4:4}, at: blk_request_module+0x35/0x2a0 block/genhd.c:901
stack backtrace:
CPU: 1 UID: 0 PID: 14116 Comm: syz.0.2189 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/07/2026
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
__mutex_lock_common kernel/locking/mutex.c:646 [inline]
__mutex_lock+0x197/0x15a0 kernel/locking/mutex.c:821
md_alloc+0x40/0xf40 drivers/md/md.c:6355
md_alloc_and_put+0x1a/0x1f0 drivers/md/md.c:6452
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:678
do_dentry_open+0x80e/0x1360 fs/open.c:1000
vfs_open_consume+0x4a/0x350 fs/open.c:1131
do_open fs/namei.c:4851 [inline]
path_openat+0x16fc/0x20f0 fs/namei.c:5016
do_file_open+0x23e/0x4a0 fs/namei.c:5045
do_sys_openat2+0x115/0x200 fs/open.c:1442
do_sys_open fs/open.c:1448 [inline]
__do_sys_openat fs/open.c:1788 [inline]
__se_sys_openat fs/open.c:1783 [inline]
__x64_sys_openat+0x138/0x170 fs/open.c:1783
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: 0033:0x7f60fdb9fb19
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:00007f60fea86028 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007f60fde25fa0 RCX: 00007f60fdb9fb19
RDX: 0000000000000002 RSI: 0000200000000980 RDI: ffffffffffffff9c
RBP: 00007f60fdc37b70 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f60fde26038 R14: 00007f60fde25fa0 R15: 00007ffe709a9cb8
device: 'md0': device_add
kobject: 'md0' (ffff888069ffe960): kobject_add_internal: parent: 'block', set: 'devices'
PM: Adding info for No Bus:md0
kobject: 'md0' (ffff888069ffe960): kobject_uevent_env
kobject: 'md0' (ffff888069ffe960): kobject_uevent_env: uevent_suppress caused the event to drop!
kobject: 'holders' (ffff888022388b80): kobject_add_internal: parent: 'md0', set: ''
kobject: 'slaves' (ffff88803544c500): kobject_add_internal: parent: 'md0', set: ''
kobject: 'queue' (ffff88802a8c6388): kobject_add_internal: parent: 'md0', set: ''
debugfs: creating file 'md0'
debugfs: creating file 'error_injection'
kobject: 'queue' (ffff88802a8c6388): kobject_uevent_env
kobject: 'queue' (ffff88802a8c6388): kobject_uevent_env: filter function caused the event to drop!
device: '9:0': device_add
kobject: '9:0' (ffff88802a8c4000): kobject_add_internal: parent: 'bdi', set: 'devices'
PM: Adding info for No Bus:9:0
kobject: '9:0' (ffff88802a8c4000): kobject_uevent_env
kobject: '9:0' (ffff88802a8c4000): fill_kobj_path: path = '/devices/virtual/bdi/9:0'
debugfs: creating file '9:0'
debugfs: creating file 'stats'
debugfs: creating file 'wb_stats'
kobject: 'md0' (ffff888069ffe960): kobject_uevent_env
kobject: 'md0' (ffff888069ffe960): fill_kobj_path: path = '/devices/virtual/block/md0'
kobject: 'md' (ffff88807adb00f0): kobject_add_internal: parent: 'md0', set: ''
kobject: 'md' (ffff88807adb00f0): kobject_uevent_env
kobject: 'md' (ffff88807adb00f0): 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 = ffff88809903ddc0, kcov->t = ffff88809903ddc0