======================================================
WARNING: possible circular locking dependency detected
syzkaller #0 Not tainted
------------------------------------------------------
syz.2.158/5496 is trying to acquire lock:
ffff800089e4c0e0 (major_names_lock){+.+.}-{4:4}, at: blk_probe_dev+0x3c/0x158 block/genhd.c:885

but task is already holding lock:
ffff0000db342358 (&mddev->reconfig_mutex){+.+.}-{4:4}, at: mddev_lock drivers/md/md.h:713 [inline]
ffff0000db342358 (&mddev->reconfig_mutex){+.+.}-{4:4}, at: mddev_suspend_and_lock+0x4c/0xd8 drivers/md/md.h:1026

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #2 (&mddev->reconfig_mutex){+.+.}-{4:4}:
       __mutex_lock_common kernel/locking/mutex.c:646 [inline]
       __mutex_lock+0x164/0x10b8 kernel/locking/mutex.c:821
       mutex_lock_nested+0x24/0x30 kernel/locking/mutex.c:874
       mddev_lock_nointr drivers/md/md.h:734 [inline]
       md_alloc+0x670/0xa18 drivers/md/md.c:6413
       md_alloc_and_put+0x28/0x84 drivers/md/md.c:6452
       md_probe+0x6c/0x88 drivers/md/md.c:6468
       blk_probe_dev+0x12c/0x158 block/genhd.c:888
       blk_request_module+0x24/0xc0 block/genhd.c:901
       blkdev_get_no_open+0x4c/0xf8 block/bdev.c:870
       blkdev_open+0xfc/0x408 block/fops.c:677
       do_dentry_open+0x5bc/0xfb4 fs/open.c:1000
       vfs_open_consume+0x54/0x2ec fs/open.c:1131
       do_open fs/namei.c:4851 [inline]
       path_openat+0x1098/0x1910 fs/namei.c:5016
       do_file_open+0x1c8/0x2e8 fs/namei.c:5045
       do_sys_openat2+0x114/0x1ec fs/open.c:1442
       do_sys_open+0xb0/0xe0 fs/open.c:1448
       __do_sys_openat fs/open.c:1464 [inline]
       __se_sys_openat fs/open.c:1459 [inline]
       __arm64_sys_openat+0xa8/0xc4 fs/open.c:1459
       __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]
       invoke_syscall+0x98/0x244 arch/arm64/kernel/syscall.c:49
       el0_svc_common+0xec/0x23c arch/arm64/kernel/syscall.c:121
       do_el0_svc+0x4c/0x5c arch/arm64/kernel/syscall.c:140
       el0_svc+0x60/0x1d8 arch/arm64/kernel/entry-common.c:797
       el0t_64_sync_handler+0x44/0x104 arch/arm64/kernel/entry-common.c:816
       el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:606

-> #1 (disks_mutex){+.+.}-{4:4}:
       __mutex_lock_common kernel/locking/mutex.c:646 [inline]
       __mutex_lock+0x164/0x10b8 kernel/locking/mutex.c:821
       mutex_lock_nested+0x24/0x30 kernel/locking/mutex.c:874
       md_alloc+0x54/0xa18 drivers/md/md.c:6355
       md_alloc_and_put+0x28/0x84 drivers/md/md.c:6452
       md_probe+0x6c/0x88 drivers/md/md.c:6468
       blk_probe_dev+0x12c/0x158 block/genhd.c:888
       blk_request_module+0x24/0xc0 block/genhd.c:901
       blkdev_get_no_open+0x4c/0xf8 block/bdev.c:870
       blkdev_open+0xfc/0x408 block/fops.c:677
       do_dentry_open+0x5bc/0xfb4 fs/open.c:1000
       vfs_open_consume+0x54/0x2ec fs/open.c:1131
       do_open fs/namei.c:4851 [inline]
       path_openat+0x1098/0x1910 fs/namei.c:5016
       do_file_open+0x1c8/0x2e8 fs/namei.c:5045
       do_sys_openat2+0x114/0x1ec fs/open.c:1442
       do_sys_open+0xb0/0xe0 fs/open.c:1448
       __do_sys_openat fs/open.c:1464 [inline]
       __se_sys_openat fs/open.c:1459 [inline]
       __arm64_sys_openat+0xa8/0xc4 fs/open.c:1459
       __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]
       invoke_syscall+0x98/0x244 arch/arm64/kernel/syscall.c:49
       el0_svc_common+0xec/0x23c arch/arm64/kernel/syscall.c:121
       do_el0_svc+0x4c/0x5c arch/arm64/kernel/syscall.c:140
       el0_svc+0x60/0x1d8 arch/arm64/kernel/entry-common.c:797
       el0t_64_sync_handler+0x44/0x104 arch/arm64/kernel/entry-common.c:816
       el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:606

-> #0 (major_names_lock){+.+.}-{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+0x1660/0x2b08 kernel/locking/lockdep.c:5288
       lock_acquire+0x13c/0x320 kernel/locking/lockdep.c:5942
       __mutex_lock_common kernel/locking/mutex.c:646 [inline]
       __mutex_lock+0x164/0x10b8 kernel/locking/mutex.c:821
       mutex_lock_nested+0x24/0x30 kernel/locking/mutex.c:874
       blk_probe_dev+0x3c/0x158 block/genhd.c:885
       blk_request_module+0x24/0xc0 block/genhd.c:901
       blkdev_get_no_open+0x4c/0xf8 block/bdev.c:870
       bdev_file_open_by_dev+0x80/0x1d8 block/bdev.c:1091
       md_import_device+0xfc/0x354 drivers/md/md.c:3861
       md_add_new_disk+0x35c/0x144c drivers/md/md.c:7681
       md_ioctl+0x1d78/0x23e4 drivers/md/md.c:8525
       blkdev_ioctl+0x574/0x904 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]
       __arm64_sys_ioctl+0x154/0x1cc fs/ioctl.c:583
       __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]
       invoke_syscall+0x98/0x244 arch/arm64/kernel/syscall.c:49
       el0_svc_common+0xec/0x23c arch/arm64/kernel/syscall.c:121
       do_el0_svc+0x4c/0x5c arch/arm64/kernel/syscall.c:140
       el0_svc+0x60/0x1d8 arch/arm64/kernel/entry-common.c:797
       el0t_64_sync_handler+0x44/0x104 arch/arm64/kernel/entry-common.c:816
       el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:606

other info that might help us debug this:

Chain exists of:
  major_names_lock --> disks_mutex --> &mddev->reconfig_mutex

 Possible unsafe locking scenario:

       CPU0                    CPU1
       ----                    ----
  lock(&mddev->reconfig_mutex);
                               lock(disks_mutex);
                               lock(&mddev->reconfig_mutex);
  lock(major_names_lock);

 *** DEADLOCK ***

locks held by syz.2.158/5496: 1, last CPU#0:
 #0: ffff0000db342358 (&mddev->reconfig_mutex){+.+.}-{4:4}, at: mddev_lock drivers/md/md.h:713 [inline]
 #0: ffff0000db342358 (&mddev->reconfig_mutex){+.+.}-{4:4}, at: mddev_suspend_and_lock+0x4c/0xd8 drivers/md/md.h:1026

stack backtrace:
CPU: 0 UID: 0 PID: 5496 Comm: syz.2.158 Not tainted syzkaller #0 PREEMPT 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/06/2026
Call trace:
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:499 (C)
 __dump_stack+0x30/0x40 lib/dump_stack.c:94
 dump_stack_lvl+0xd8/0x12c lib/dump_stack.c:120
 dump_stack+0x1c/0x28 lib/dump_stack.c:129
 print_circular_bug+0x328/0x330 kernel/locking/lockdep.c:2087
 check_noncircular+0x158/0x174 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+0x1660/0x2b08 kernel/locking/lockdep.c:5288
 lock_acquire+0x13c/0x320 kernel/locking/lockdep.c:5942
 __mutex_lock_common kernel/locking/mutex.c:646 [inline]
 __mutex_lock+0x164/0x10b8 kernel/locking/mutex.c:821
 mutex_lock_nested+0x24/0x30 kernel/locking/mutex.c:874
 blk_probe_dev+0x3c/0x158 block/genhd.c:885
 blk_request_module+0x24/0xc0 block/genhd.c:901
 blkdev_get_no_open+0x4c/0xf8 block/bdev.c:870
 bdev_file_open_by_dev+0x80/0x1d8 block/bdev.c:1091
 md_import_device+0xfc/0x354 drivers/md/md.c:3861
 md_add_new_disk+0x35c/0x144c drivers/md/md.c:7681
 md_ioctl+0x1d78/0x23e4 drivers/md/md.c:8525
 blkdev_ioctl+0x574/0x904 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]
 __arm64_sys_ioctl+0x154/0x1cc fs/ioctl.c:583
 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]
 invoke_syscall+0x98/0x244 arch/arm64/kernel/syscall.c:49
 el0_svc_common+0xec/0x23c arch/arm64/kernel/syscall.c:121
 do_el0_svc+0x4c/0x5c arch/arm64/kernel/syscall.c:140
 el0_svc+0x60/0x1d8 arch/arm64/kernel/entry-common.c:797
 el0t_64_sync_handler+0x44/0x104 arch/arm64/kernel/entry-common.c:816
 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:606
md: could not open device unknown-block(0,0).
md: error, md_import_device() returned -6