md: async del_gendisk mode will be removed in future, please upgrade to mdadm-4.5+ md: could not open device unknown-block(1,17). ====================================================== WARNING: possible circular locking dependency detected syzkaller #0 Tainted: G L ------------------------------------------------------ syz.8.2826/15342 is trying to acquire lock: ffff888024316358 (&mddev->reconfig_mutex){+.+.}-{4:4}, at: mddev_lock drivers/md/md.h:713 [inline] ffff888024316358 (&mddev->reconfig_mutex){+.+.}-{4:4}, at: array_state_store+0x4a5/0xe90 drivers/md/md.c:4705 but task is already holding lock: ffff88805d5592d8 (kn->active#69){++++}-{0:0}, at: kernfs_get_active_of fs/kernfs/file.c:73 [inline] ffff88805d5592d8 (kn->active#69){++++}-{0:0}, at: kernfs_fop_write_iter+0x22b/0x540 fs/kernfs/file.c:337 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #4 (kn->active#69){++++}-{0:0}: kernfs_drain+0x293/0x640 fs/kernfs/dir.c:534 __kernfs_remove+0x493/0x910 fs/kernfs/dir.c:1578 kernfs_remove_by_name_ns+0xc0/0x140 fs/kernfs/dir.c:1796 kernfs_remove_by_name include/linux/kernfs.h:644 [inline] remove_files fs/sysfs/group.c:28 [inline] sysfs_remove_group+0x101/0x2e0 fs/sysfs/group.c:328 sysfs_remove_groups+0x54/0xb0 fs/sysfs/group.c:352 __kobject_del+0x83/0x310 lib/kobject.c:595 kobject_cleanup lib/kobject.c:680 [inline] kobject_release lib/kobject.c:720 [inline] kref_put include/linux/kref.h:65 [inline] kobject_put+0x23a/0x550 lib/kobject.c:737 process_one_work kernel/workqueue.c:3495 [inline] process_scheduled_works+0xc3d/0x1630 kernel/workqueue.c:3578 worker_thread+0xa47/0xfb0 kernel/workqueue.c:3659 kthread+0x38b/0x480 kernel/kthread.c:436 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 -> #3 ((work_completion)(&mddev->del_work)){+.+.}-{0:0}: process_one_work kernel/workqueue.c:3471 [inline] process_scheduled_works+0xc03/0x1630 kernel/workqueue.c:3578 worker_thread+0xa47/0xfb0 kernel/workqueue.c:3659 kthread+0x38b/0x480 kernel/kthread.c:436 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 -> #2 ((wq_completion)md_misc){+.+.}-{0:0}: touch_wq_lockdep_map+0xcb/0x180 kernel/workqueue.c:4272 __flush_workqueue+0x148/0x10b0 kernel/workqueue.c:4314 md_alloc+0x32/0xf20 drivers/md/md.c:6334 md_alloc_and_put+0x1a/0x1f0 drivers/md/md.c:6423 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:677 do_dentry_open+0x80e/0x1360 fs/open.c:1000 vfs_open_consume+0x4a/0x350 fs/open.c:1131 do_open fs/namei.c:4845 [inline] path_openat+0x16fc/0x20f0 fs/namei.c:5010 do_file_open+0x23e/0x4a0 fs/namei.c:5039 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 -> #1 (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:3847 new_dev_store+0x46d/0x860 drivers/md/md.c:-1 md_attr_store+0x3b7/0x640 drivers/md/md.c:6158 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 (&mddev->reconfig_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 mddev_lock drivers/md/md.h:713 [inline] array_state_store+0x4a5/0xe90 drivers/md/md.c:4705 md_attr_store+0x3b7/0x640 drivers/md/md.c:6158 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 other info that might help us debug this: Chain exists of: &mddev->reconfig_mutex --> (work_completion)(&mddev->del_work) --> kn->active#69 Possible unsafe locking scenario: CPU0 CPU1 ---- ---- rlock(kn->active#69); lock((work_completion)(&mddev->del_work)); lock(kn->active#69); lock(&mddev->reconfig_mutex); *** DEADLOCK *** locks held by syz.8.2826/15342: 5, last CPU#1: #0: ffff8880348137b0 (&f->f_pos_lock){+.+.}-{4:4}, at: fdget_pos+0x118/0x160 fs/file.c:1409 #1: ffff88807f978460 (sb_writers#7){.+.+}-{0:0}, at: file_start_write include/linux/fs.h:2760 [inline] #1: ffff88807f978460 (sb_writers#7){.+.+}-{0:0}, at: vfs_write+0x22b/0xba0 fs/read_write.c:683 #2: ffff8880270de108 (&of->prealloc_mutex){+.+.}-{4:4}, at: kernfs_fop_write_iter+0x147/0x540 fs/kernfs/file.c:320 #3: ffff8880270de080 (&of->mutex){+.+.}-{4:4}, at: kernfs_fop_write_iter+0x1d8/0x540 fs/kernfs/file.c:336 #4: ffff88805d5592d8 (kn->active#69){++++}-{0:0}, at: kernfs_get_active_of fs/kernfs/file.c:73 [inline] #4: ffff88805d5592d8 (kn->active#69){++++}-{0:0}, at: kernfs_fop_write_iter+0x22b/0x540 fs/kernfs/file.c:337 stack backtrace: CPU: 1 UID: 0 PID: 15342 Comm: syz.8.2826 Tainted: G L syzkaller #0 PREEMPT(full) Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026 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 mddev_lock drivers/md/md.h:713 [inline] array_state_store+0x4a5/0xe90 drivers/md/md.c:4705 md_attr_store+0x3b7/0x640 drivers/md/md.c:6158 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 RIP: 0033:0x7f694739f559 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:00007f69455f6028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007f6947625fa0 RCX: 00007f694739f559 RDX: 0000000000000006 RSI: 0000200000000440 RDI: 0000000000000009 RBP: 00007f6947436b20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f6947626038 R14: 00007f6947625fa0 R15: 00007fff6e5b6478 md: pers->run() failed ... kcov: kcov_task_exit: t = ffff88804635ddc0, kcov->t = ffff88804635ddc0