WARNING: possible circular locking dependency detected
syzkaller #0 Not tainted
------------------------------------------------------
syz.3.68/6107 is trying to acquire lock:
ffffffff91a512c0 (disks_mutex){+.+.}-{4:4}, at: md_alloc+0x3e/0x10c0 drivers/md/md.c:6355
but task is already holding lock:
ffffffff90be3460 (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:
-> #2 (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+0x19f/0x1c10 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:3861
md_add_new_disk+0x4b6/0x1820 drivers/md/md.c:7536
md_ioctl+0x2c1d/0x3700 drivers/md/md.c:8525
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
-> #1 (&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+0x19f/0x1c10 kernel/locking/mutex.c:821
mddev_lock_nointr drivers/md/md.h:734 [inline]
md_alloc+0x3d0/0x10c0 drivers/md/md.c:6413
md_alloc_and_put+0x16/0xb0 drivers/md/md.c:6452
add_named_array+0x27d/0x3a0 drivers/md/md.c:6495
param_attr_store+0x199/0x300 kernel/params.c:591
module_attr_store+0x58/0x80 kernel/params.c:906
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
-> #0 (disks_mutex){+.+.}-{4:4}:
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
__mutex_lock_common kernel/locking/mutex.c:646 [inline]
__mutex_lock+0x19f/0x1c10 kernel/locking/mutex.c:821
md_alloc+0x3e/0x10c0 drivers/md/md.c:6355
md_alloc_and_put drivers/md/md.c:6452 [inline]
md_probe drivers/md/md.c:6468 [inline]
md_probe+0x73/0xf0 drivers/md/md.c:6463
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
blkdev_open+0x141/0x4f0 block/fops.c:677
do_dentry_open+0x674/0x1470 fs/open.c:1000
vfs_open_consume+0xcc/0x460 fs/open.c:1131
do_open fs/namei.c:4851 [inline]
path_openat+0x1547/0x23f0 fs/namei.c:5016
do_file_open+0x20e/0x430 fs/namei.c:5045
do_sys_openat2+0x163/0x1d0 fs/open.c:1442
do_sys_open fs/open.c:1448 [inline]
__do_sys_openat fs/open.c:1464 [inline]
__se_sys_openat fs/open.c:1459 [inline]
__x64_sys_openat+0x12d/0x210 fs/open.c:1459
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:
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.3.68/6107: 1, last CPU#2:
#0: ffffffff90be3460 (major_names_lock){+.+.}-{4:4}, at: blk_probe_dev+0x28/0x1e0 block/genhd.c:885
stack backtrace:
CPU: 2 UID: 0 PID: 6107 Comm: syz.3.68 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
__mutex_lock_common kernel/locking/mutex.c:646 [inline]
__mutex_lock+0x19f/0x1c10 kernel/locking/mutex.c:821
md_alloc+0x3e/0x10c0 drivers/md/md.c:6355
md_alloc_and_put drivers/md/md.c:6452 [inline]
md_probe drivers/md/md.c:6468 [inline]
md_probe+0x73/0xf0 drivers/md/md.c:6463
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
blkdev_open+0x141/0x4f0 block/fops.c:677
do_dentry_open+0x674/0x1470 fs/open.c:1000
vfs_open_consume+0xcc/0x460 fs/open.c:1131
do_open fs/namei.c:4851 [inline]
path_openat+0x1547/0x23f0 fs/namei.c:5016
do_file_open+0x20e/0x430 fs/namei.c:5045
do_sys_openat2+0x163/0x1d0 fs/open.c:1442
do_sys_open fs/open.c:1448 [inline]
__do_sys_openat fs/open.c:1464 [inline]
__se_sys_openat fs/open.c:1459 [inline]
__x64_sys_openat+0x12d/0x210 fs/open.c:1459
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: 0033:0x7f9cab59fb19
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:00007f9cac479028 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007f9cab825fa0 RCX: 00007f9cab59fb19
RDX: 0000000000000002 RSI: 0000200000000980 RDI: ffffffffffffff9c
RBP: 00007f9cab637b70 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f9cab826038 R14: 00007f9cab825fa0 R15: 00007ffc89ee2008
kobject: 'bio-184' (ffff88803fa26570): kobject_add_internal: parent: 'slab', set: 'slab'
device: 'md3': device_add
kobject: 'md3' (ffff888021898d60): kobject_add_internal: parent: 'block', set: 'devices'
PM: Adding info for No Bus:md3
kobject: 'md3' (ffff888021898d60): kobject_uevent_env
kobject: 'md3' (ffff888021898d60): kobject_uevent_env: uevent_suppress caused the event to drop!
kobject: 'holders' (ffff88803f34dd80): kobject_add_internal: parent: 'md3', set: ''
kobject: 'slaves' (ffff88803f34dd00): kobject_add_internal: parent: 'md3', set: ''
kobject: 'queue' (ffff8880386c1388): kobject_add_internal: parent: 'md3', set: ''
debugfs: creating file 'md3'
debugfs: creating file 'error_injection'
kobject: 'queue' (ffff8880386c1388): kobject_uevent_env
kobject: 'queue' (ffff8880386c1388): kobject_uevent_env: filter function caused the event to drop!
device: '9:3': device_add
kobject: '9:3' (ffff8880248e3000): kobject_add_internal: parent: 'bdi', set: 'devices'
PM: Adding info for No Bus:9:3
kobject: '9:3' (ffff8880248e3000): kobject_uevent_env
kobject: '9:3' (ffff8880248e3000): fill_kobj_path: path = '/devices/virtual/bdi/9:3'
debugfs: creating file '9:3'
debugfs: creating file 'stats'
debugfs: creating file 'wb_stats'
kobject: 'md3' (ffff888021898d60): kobject_uevent_env
kobject: 'md3' (ffff888021898d60): fill_kobj_path: path = '/devices/virtual/block/md3'
kobject: 'md' (ffff888028c220f0): kobject_add_internal: parent: 'md3', set: ''
kobject: 'md' (ffff888028c220f0): kobject_uevent_env
kobject: 'md' (ffff888028c220f0): 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 = ffff888027520000, kcov->t = ffff888027520000