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.
======================================================
WARNING: possible circular locking dependency detected
syzkaller #0 Not tainted
------------------------------------------------------
syz.4.531/7430 is trying to acquire lock:
ffffffff90b6d920 (major_names_lock){+.+.}-{4:4}, at: blk_probe_dev block/genhd.c:885 [inline]
ffffffff90b6d920 (major_names_lock){+.+.}-{4:4}, at: blk_request_module+0x35/0x2a0 block/genhd.c:901

but task is already holding lock:
ffff88802dd8e358 (&mddev->reconfig_mutex){+.+.}-{4:4}, at: mddev_lock drivers/md/md.h:713 [inline]
ffff88802dd8e358 (&mddev->reconfig_mutex){+.+.}-{4:4}, at: mddev_suspend_and_lock+0x48/0xf0 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+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
       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:674
       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:1443
       do_sys_open fs/open.c:1449 [inline]
       __do_sys_openat fs/open.c:1789 [inline]
       __se_sys_openat fs/open.c:1784 [inline]
       __x64_sys_openat+0x138/0x170 fs/open.c:1784
       do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
       do_syscall_64+0x16a/0x530 arch/x86/entry/syscall_64.c:89
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

-> #1 (disks_mutex){+.+.}-{4:4}:
       __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:674
       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:1443
       do_sys_open fs/open.c:1449 [inline]
       __do_sys_openat fs/open.c:1789 [inline]
       __se_sys_openat fs/open.c:1784 [inline]
       __x64_sys_openat+0x138/0x170 fs/open.c:1784
       do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
       do_syscall_64+0x16a/0x530 arch/x86/entry/syscall_64.c:89
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

-> #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+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
       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
       md_add_new_disk+0x3a3/0x1850 drivers/md/md.c:7536
       md_ioctl+0x2027/0x2630 drivers/md/md.c:8525
       blkdev_ioctl+0x5e3/0x740 block/ioctl.c:798
       vfs_ioctl fs/ioctl.c:52 [inline]
       __do_sys_ioctl fs/ioctl.c:598 [inline]
       __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:584
       do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
       do_syscall_64+0x16a/0x530 arch/x86/entry/syscall_64.c:89
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

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.4.531/7430: 1, on CPU#0:
 #0: ffff88802dd8e358 (&mddev->reconfig_mutex){+.+.}-{4:4}, at: mddev_lock drivers/md/md.h:713 [inline]
 #0: ffff88802dd8e358 (&mddev->reconfig_mutex){+.+.}-{4:4}, at: mddev_suspend_and_lock+0x48/0xf0 drivers/md/md.h:1026

stack backtrace:
CPU: 0 UID: 0 PID: 7430 Comm: syz.4.531 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/06/2026
Call Trace:
 <TASK>
 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
 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
 md_add_new_disk+0x3a3/0x1850 drivers/md/md.c:7536
 md_ioctl+0x2027/0x2630 drivers/md/md.c:8525
 blkdev_ioctl+0x5e3/0x740 block/ioctl.c:798
 vfs_ioctl fs/ioctl.c:52 [inline]
 __do_sys_ioctl fs/ioctl.c:598 [inline]
 __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:584
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x16a/0x530 arch/x86/entry/syscall_64.c:89
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f685efa8f19
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:00007f685fda4028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f685f225fa0 RCX: 00007f685efa8f19
RDX: 0000000000000000 RSI: 0000000040140921 RDI: 0000000000000003
RBP: 00007f685f037f6d R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f685f226038 R14: 00007f685f225fa0 R15: 00007ffe5a9af4c8
 </TASK>
FAULT_INJECTION: forcing a failure.
name failslab, interval 1, probability 0, space 0, times 0
CPU: 0 UID: 0 PID: 7430 Comm: syz.4.531 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/06/2026
Call Trace:
 <TASK>
 dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
 fail_dump lib/fault-inject.c:74 [inline]
 should_fail_ex+0x3eb/0x540 lib/fault-inject.c:175
 should_failslab+0xa8/0x100 mm/failslab.c:46
 slab_pre_alloc_hook mm/slub.c:4673 [inline]
 slab_alloc_node mm/slub.c:5009 [inline]
 __kmalloc_cache_noprof+0x9e/0x600 mm/slub.c:5674
 _kmalloc_noprof include/linux/slab.h:991 [inline]
 call_modprobe kernel/module/kmod.c:85 [inline]
 __request_module+0x2d0/0x630 kernel/module/kmod.c:174
 blk_request_module+0x142/0x2a0 block/genhd.c:904
 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
 md_add_new_disk+0x3a3/0x1850 drivers/md/md.c:7536
 md_ioctl+0x2027/0x2630 drivers/md/md.c:8525
 blkdev_ioctl+0x5e3/0x740 block/ioctl.c:798
 vfs_ioctl fs/ioctl.c:52 [inline]
 __do_sys_ioctl fs/ioctl.c:598 [inline]
 __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:584
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x16a/0x530 arch/x86/entry/syscall_64.c:89
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f685efa8f19
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:00007f685fda4028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f685f225fa0 RCX: 00007f685efa8f19
RDX: 0000000000000000 RSI: 0000000040140921 RDI: 0000000000000003
RBP: 00007f685f037f6d R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f685f226038 R14: 00007f685f225fa0 R15: 00007ffe5a9af4c8
 </TASK>
md: could not open device unknown-block(0,0).
md: md_import_device returned -6