block device autoloading is deprecated and will be removed. ====================================================== WARNING: possible circular locking dependency detected syzkaller #0 Not tainted ------------------------------------------------------ syz.8.1116/16877 is trying to acquire lock: ffff800016c47188 (major_names_lock){+.+.}-{3:3}, at: blk_probe_dev block/genhd.c:753 [inline] ffff800016c47188 (major_names_lock){+.+.}-{3:3}, at: blk_request_module+0x40/0x29c block/genhd.c:769 but task is already holding lock: ffff0000de8902d0 (&mddev->reconfig_mutex){+.+.}-{3:3}, at: mddev_lock drivers/md/md.h:577 [inline] ffff0000de8902d0 (&mddev->reconfig_mutex){+.+.}-{3:3}, at: md_ioctl+0xa04/0x25cc drivers/md/md.c:7681 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #4 (&mddev->reconfig_mutex){+.+.}-{3:3}: __mutex_lock_common+0x1a0/0x1f3c kernel/locking/mutex.c:603 __mutex_lock kernel/locking/mutex.c:747 [inline] mutex_lock_interruptible_nested+0x38/0x44 kernel/locking/mutex.c:821 mddev_lock drivers/md/md.h:577 [inline] array_state_store+0x28c/0x944 drivers/md/md.c:4479 md_attr_store+0x168/0x234 drivers/md/md.c:5633 sysfs_kf_write+0x1f8/0x274 fs/sysfs/file.c:140 kernfs_fop_write_iter+0x390/0x4b4 fs/kernfs/file.c:352 call_write_iter include/linux/fs.h:2271 [inline] new_sync_write fs/read_write.c:491 [inline] vfs_write+0x3c8/0x7c8 fs/read_write.c:584 ksys_write+0x12c/0x228 fs/read_write.c:637 __do_sys_write fs/read_write.c:649 [inline] __se_sys_write fs/read_write.c:646 [inline] __arm64_sys_write+0x7c/0x90 fs/read_write.c:646 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x290 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x13c/0x258 arch/arm64/kernel/syscall.c:140 do_el0_svc+0x5c/0x134 arch/arm64/kernel/syscall.c:204 el0_svc+0x58/0x12c arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585 -> #3 (kn->active#64){++++}-{0:0}: kernfs_drain+0x294/0x5f8 fs/kernfs/dir.c:499 __kernfs_remove+0x3c0/0x654 fs/kernfs/dir.c:1461 kernfs_remove_by_name_ns+0xe4/0x184 fs/kernfs/dir.c:1667 kernfs_remove_by_name include/linux/kernfs.h:622 [inline] remove_files fs/sysfs/group.c:28 [inline] sysfs_remove_group+0xf4/0x278 fs/sysfs/group.c:288 sysfs_remove_groups+0x5c/0xb4 fs/sysfs/group.c:312 __kobject_del+0x94/0x2d4 lib/kobject.c:587 kobject_cleanup lib/kobject.c:672 [inline] kobject_release lib/kobject.c:712 [inline] kref_put include/linux/kref.h:65 [inline] kobject_put+0x2c0/0x41c lib/kobject.c:729 mddev_delayed_delete+0x20/0x30 drivers/md/md.c:5667 process_one_work+0x7e4/0x13bc kernel/workqueue.c:2292 worker_thread+0x8cc/0xfe8 kernel/workqueue.c:2439 kthread+0x254/0x2e0 kernel/kthread.c:376 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:850 -> #2 ((work_completion)(&mddev->del_work)){+.+.}-{0:0}: process_one_work+0x710/0x13bc kernel/workqueue.c:2268 worker_thread+0x8cc/0xfe8 kernel/workqueue.c:2439 kthread+0x254/0x2e0 kernel/kthread.c:376 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:850 -> #1 ((wq_completion)md_misc){+.+.}-{0:0}: __flush_workqueue+0x134/0x1060 kernel/workqueue.c:2812 md_alloc+0x44/0xb3c drivers/md/md.c:5708 md_alloc_and_put drivers/md/md.c:5800 [inline] md_probe+0x68/0xdc drivers/md/md.c:5813 blk_probe_dev block/genhd.c:756 [inline] blk_request_module+0x274/0x29c block/genhd.c:-1 blkdev_get_no_open+0x48/0xdc block/bdev.c:758 blkdev_get_by_dev+0x84/0x8b8 block/bdev.c:815 blkdev_open+0x108/0x2a0 block/fops.c:500 do_dentry_open+0x738/0xf8c fs/open.c:882 vfs_open+0x7c/0x90 fs/open.c:1015 do_open fs/namei.c:3677 [inline] path_openat+0x1fc0/0x27a0 fs/namei.c:3834 do_filp_open+0x198/0x38c fs/namei.c:3861 do_sys_openat2+0x134/0x3fc fs/open.c:1320 do_sys_open fs/open.c:1336 [inline] __do_sys_openat fs/open.c:1352 [inline] __se_sys_openat fs/open.c:1347 [inline] __arm64_sys_openat+0x11c/0x150 fs/open.c:1347 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x290 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x13c/0x258 arch/arm64/kernel/syscall.c:140 do_el0_svc+0x5c/0x134 arch/arm64/kernel/syscall.c:204 el0_svc+0x58/0x12c arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585 -> #0 (major_names_lock){+.+.}-{3:3}: check_prev_add kernel/locking/lockdep.c:3162 [inline] check_prevs_add kernel/locking/lockdep.c:3281 [inline] validate_chain kernel/locking/lockdep.c:3897 [inline] __lock_acquire+0x3504/0x7280 kernel/locking/lockdep.c:5171 lock_acquire+0x210/0x63c kernel/locking/lockdep.c:5790 __mutex_lock_common+0x1a0/0x1f3c kernel/locking/mutex.c:603 __mutex_lock kernel/locking/mutex.c:747 [inline] mutex_lock_nested+0x38/0x44 kernel/locking/mutex.c:799 blk_probe_dev block/genhd.c:753 [inline] blk_request_module+0x40/0x29c block/genhd.c:769 blkdev_get_no_open+0x48/0xdc block/bdev.c:758 blkdev_get_by_dev+0x84/0x8b8 block/bdev.c:815 lock_rdev drivers/md/md.c:2561 [inline] md_import_device+0x2a4/0x598 drivers/md/md.c:3751 md_add_new_disk+0x358/0x1484 drivers/md/md.c:6969 md_ioctl+0x2158/0x25cc drivers/md/md.c:7806 blkdev_ioctl+0x654/0xb74 block/ioctl.c:626 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:870 [inline] __se_sys_ioctl fs/ioctl.c:856 [inline] __arm64_sys_ioctl+0x14c/0x1c8 fs/ioctl.c:856 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x290 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x13c/0x258 arch/arm64/kernel/syscall.c:140 do_el0_svc+0x5c/0x134 arch/arm64/kernel/syscall.c:204 el0_svc+0x58/0x12c arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585 other info that might help us debug this: Chain exists of: major_names_lock --> kn->active#64 --> &mddev->reconfig_mutex Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&mddev->reconfig_mutex); lock(kn->active#64); lock(&mddev->reconfig_mutex); lock(major_names_lock); *** DEADLOCK *** 1 lock held by syz.8.1116/16877: #0: ffff0000de8902d0 (&mddev->reconfig_mutex){+.+.}-{3:3}, at: mddev_lock drivers/md/md.h:577 [inline] #0: ffff0000de8902d0 (&mddev->reconfig_mutex){+.+.}-{3:3}, at: md_ioctl+0xa04/0x25cc drivers/md/md.c:7681 stack backtrace: CPU: 1 PID: 16877 Comm: syz.8.1116 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/14/2026 Call trace: dump_backtrace+0x1c4/0x1f0 arch/arm64/kernel/stacktrace.c:158 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:165 __dump_stack+0x30/0x40 lib/dump_stack.c:88 dump_stack_lvl+0xf4/0x15c lib/dump_stack.c:106 dump_stack+0x1c/0x5c lib/dump_stack.c:113 print_circular_bug+0x148/0x1b0 kernel/locking/lockdep.c:2088 check_noncircular+0x290/0x370 kernel/locking/lockdep.c:2215 check_prev_add kernel/locking/lockdep.c:3162 [inline] check_prevs_add kernel/locking/lockdep.c:3281 [inline] validate_chain kernel/locking/lockdep.c:3897 [inline] __lock_acquire+0x3504/0x7280 kernel/locking/lockdep.c:5171 lock_acquire+0x210/0x63c kernel/locking/lockdep.c:5790 __mutex_lock_common+0x1a0/0x1f3c kernel/locking/mutex.c:603 __mutex_lock kernel/locking/mutex.c:747 [inline] mutex_lock_nested+0x38/0x44 kernel/locking/mutex.c:799 blk_probe_dev block/genhd.c:753 [inline] blk_request_module+0x40/0x29c block/genhd.c:769 blkdev_get_no_open+0x48/0xdc block/bdev.c:758 blkdev_get_by_dev+0x84/0x8b8 block/bdev.c:815 lock_rdev drivers/md/md.c:2561 [inline] md_import_device+0x2a4/0x598 drivers/md/md.c:3751 md_add_new_disk+0x358/0x1484 drivers/md/md.c:6969 md_ioctl+0x2158/0x25cc drivers/md/md.c:7806 blkdev_ioctl+0x654/0xb74 block/ioctl.c:626 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:870 [inline] __se_sys_ioctl fs/ioctl.c:856 [inline] __arm64_sys_ioctl+0x14c/0x1c8 fs/ioctl.c:856 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x290 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x13c/0x258 arch/arm64/kernel/syscall.c:140 do_el0_svc+0x5c/0x134 arch/arm64/kernel/syscall.c:204 el0_svc+0x58/0x12c arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585 block device autoloading is deprecated and will be removed. md/raid:md8: device ram17 operational as raid disk 1 md/raid:md8: device ram16 operational as raid disk 0 md/raid:md8: raid level 5 active with 2 out of 3 devices, algorithm 2 md8: detected capacity change from 0 to 8192