program: io_uring_setup(0x115a, &(0x7f0000000440)={0x0, 0x4ef1, 0x40, 0x0, 0x4d5}) mkdirat(0xffffffffffffff9c, &(0x7f0000000000)='./sys\x00', 0x1ff) mount(0x0, &(0x7f0000000040)='./sys\x00', &(0x7f0000000080)='sysfs\x00', 0x0, 0x0) mkdirat(0xffffffffffffff9c, &(0x7f00000000c0)='./dev\x00', 0x1ff) mount(0x0, &(0x7f0000000100)='./dev\x00', &(0x7f0000000140)='devtmpfs\x00', 0x0, 0x0) r0 = openat(0xffffffffffffff9c, &(0x7f0000000180)='./sys/module/md_mod/parameters/new_array\x00', 0x1, 0x0) write(r0, &(0x7f0000000200)='md0', 0x3) r1 = openat(0xffffffffffffff9c, &(0x7f0000000300)='./dev/md0\x00', 0x105042, 0x0) ioctl(r1, 0x40480923, &(0x7f0000000380)="000000000000000000000000000000000a000000000400000200000002000000000000000100000000000000000000000000000000000000000000000000000002010000000001") ioctl(r1, 0x40140921, &(0x7f0000000420)="0100000001000000010000000100000006") ioctl(r1, 0x400c0930, 0x0) ioctl(r1, 0x40140921, &(0x7f0000000440)="020000000100") [ 102.139315][ T4646] Bluetooth: hci0: command tx timeout [ 102.328986][ T5326] md: async del_gendisk mode will be removed in future, please upgrade to mdadm-4.5+ [ 102.332030][ T5327] md: async del_gendisk mode will be removed in future, please upgrade to mdadm-4.5+ [ 102.332175][ T5327] block device autoloading is deprecated and will be removed. [ 102.404656][ T5326] md/raid10:md0: not clean -- starting background reconstruction [ 102.404672][ T5326] md/raid10:md0: active with 1 out of 2 devices [ 102.405295][ T5326] md0: detected capacity change from 0 to 2048 [ 102.424980][ T5330] md: resync of RAID array md0 [ 102.428032][ T5327] [ 102.431238][ T5327] ====================================================== [ 102.434243][ T5327] WARNING: possible circular locking dependency detected [ 102.437092][ T5327] syzkaller #0 Not tainted [ 102.438992][ T5327] ------------------------------------------------------ [ 102.442073][ T5327] syz.0.0/5327 is trying to acquire lock: [ 102.444533][ T5327] ffffffff8f555740 (major_names_lock){+.+.}-{4:4}, at: blk_request_module+0x35/0x2a0 [ 102.448606][ T5327] [ 102.448606][ T5327] but task is already holding lock: [ 102.451692][ T5327] ffff88803c9ec358 (&mddev->reconfig_mutex){+.+.}-{4:4}, at: mddev_suspend_and_lock+0x48/0xf0 [ 102.456010][ T5327] [ 102.456010][ T5327] which lock already depends on the new lock. [ 102.456010][ T5327] [ 102.460313][ T5327] [ 102.460313][ T5327] the existing dependency chain (in reverse order) is: [ 102.464110][ T5327] [ 102.464110][ T5327] -> #3 (&mddev->reconfig_mutex){+.+.}-{4:4}: [ 102.467544][ T5327] __mutex_lock+0x19d/0x1550 [ 102.469674][ T5327] md_start_sync+0x179/0x1010 [ 102.471872][ T5327] process_scheduled_works+0xc3d/0x1630 [ 102.474475][ T5327] worker_thread+0xa47/0xfb0 [ 102.476820][ T5327] kthread+0x38b/0x480 [ 102.478854][ T5327] ret_from_fork+0x514/0xb70 [ 102.481093][ T5327] ret_from_fork_asm+0x1a/0x30 [ 102.483420][ T5327] [ 102.483420][ T5327] -> #2 ((work_completion)(&mddev->sync_work)){+.+.}-{0:0}: [ 102.487357][ T5327] process_scheduled_works+0xc03/0x1630 [ 102.489951][ T5327] worker_thread+0xa47/0xfb0 [ 102.492095][ T5327] kthread+0x38b/0x480 [ 102.494098][ T5327] ret_from_fork+0x514/0xb70 [ 102.496287][ T5327] ret_from_fork_asm+0x1a/0x30 [ 102.498557][ T5327] [ 102.498557][ T5327] -> #1 ((wq_completion)md_misc){+.+.}-{0:0}: [ 102.502049][ T5327] touch_wq_lockdep_map+0xcb/0x180 [ 102.504450][ T5327] __flush_workqueue+0x148/0x1470 [ 102.506689][ T5327] md_alloc+0x32/0xf20 [ 102.508662][ T5327] md_alloc_and_put+0x1a/0x1f0 [ 102.510987][ T5327] blk_request_module+0x27d/0x2a0 [ 102.513429][ T5327] blkdev_get_no_open+0x3f/0xe0 [ 102.515795][ T5327] blkdev_open+0x1d7/0x600 [ 102.518419][ T5327] do_dentry_open+0x816/0x1380 [ 102.521375][ T5327] vfs_open+0x3b/0x340 [ 102.523647][ T5327] path_openat+0x1443/0x1d60 [ 102.525872][ T5327] do_file_open+0x23e/0x4a0 [ 102.528038][ T5327] do_sys_openat2+0x115/0x200 [ 102.530322][ T5327] __x64_sys_openat+0x138/0x170 [ 102.532713][ T5327] do_syscall_64+0x166/0x520 [ 102.534788][ T5327] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 102.537455][ T5327] [ 102.537455][ T5327] -> #0 (major_names_lock){+.+.}-{4:4}: [ 102.540719][ T5327] __lock_acquire+0x164c/0x2de0 [ 102.543099][ T5327] lock_acquire+0x115/0x350 [ 102.545284][ T5327] __mutex_lock+0x19d/0x1550 [ 102.547447][ T5327] blk_request_module+0x35/0x2a0 [ 102.549752][ T5327] blkdev_get_no_open+0x3f/0xe0 [ 102.551983][ T5327] bdev_file_open_by_dev+0xa0/0x240 [ 102.554440][ T5327] md_import_device+0x2e9/0x650 [ 102.556678][ T5327] md_add_new_disk+0x669/0x1850 [ 102.558934][ T5327] md_ioctl+0x1fe4/0x2610 [ 102.561026][ T5327] blkdev_ioctl+0x5e3/0x740 [ 102.563571][ T5327] __se_sys_ioctl+0xfc/0x170 [ 102.566365][ T5327] do_syscall_64+0x166/0x520 [ 102.569146][ T5327] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 102.572386][ T5327] [ 102.572386][ T5327] other info that might help us debug this: [ 102.572386][ T5327] [ 102.577614][ T5327] Chain exists of: [ 102.577614][ T5327] major_names_lock --> (work_completion)(&mddev->sync_work) --> &mddev->reconfig_mutex [ 102.577614][ T5327] [ 102.585635][ T5327] Possible unsafe locking scenario: [ 102.585635][ T5327] [ 102.588871][ T5327] CPU0 CPU1 [ 102.591239][ T5327] ---- ---- [ 102.593622][ T5327] lock(&mddev->reconfig_mutex); [ 102.595810][ T5327] lock((work_completion)(&mddev->sync_work)); [ 102.599501][ T5327] lock(&mddev->reconfig_mutex); [ 102.602717][ T5327] lock(major_names_lock); [ 102.604692][ T5327] [ 102.604692][ T5327] *** DEADLOCK *** [ 102.604692][ T5327] [ 102.608416][ T5327] locks held by syz.0.0/5327: 1, last CPU#0: [ 102.610997][ T5327] #0: ffff88803c9ec358 (&mddev->reconfig_mutex){+.+.}-{4:4}, at: mddev_suspend_and_lock+0x48/0xf0 [ 102.615328][ T5327] [ 102.615328][ T5327] stack backtrace: [ 102.617758][ T5327] CPU: 0 UID: 0 PID: 5327 Comm: syz.0.0 Not tainted syzkaller #0 PREEMPT(full) [ 102.621366][ T5327] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [ 102.625425][ T5327] Call Trace: [ 102.626838][ T5327] [ 102.628109][ T5327] dump_stack_lvl+0xe8/0x150 [ 102.630024][ T5327] print_circular_bug+0x2e2/0x300 [ 102.632201][ T5327] check_noncircular+0x12f/0x150 [ 102.634307][ T5327] __lock_acquire+0x164c/0x2de0 [ 102.636343][ T5327] ? post_alloc_hook+0x208/0x250 [ 102.638482][ T5327] ? get_page_from_freelist+0x2209/0x2280 [ 102.640933][ T5327] lock_acquire+0x115/0x350 [ 102.642845][ T5327] ? blk_request_module+0x35/0x2a0 [ 102.645049][ T5327] __mutex_lock+0x19d/0x1550 [ 102.647154][ T5327] ? blk_request_module+0x35/0x2a0 [ 102.649241][ T5327] ? lock_acquire+0x115/0x350 [ 102.651200][ T5327] ? blk_request_module+0x35/0x2a0 [ 102.653369][ T5327] ? __pfx___mutex_lock+0x10/0x10 [ 102.655492][ T5327] ? find_inode_fast+0x5dc/0x740 [ 102.657626][ T5327] ? find_inode_fast+0xd2/0x740 [ 102.659777][ T5327] blk_request_module+0x35/0x2a0 [ 102.661861][ T5327] blkdev_get_no_open+0x3f/0xe0 [ 102.663989][ T5327] bdev_file_open_by_dev+0xa0/0x240 [ 102.666310][ T5327] md_import_device+0x2e9/0x650 [ 102.668523][ T5327] md_add_new_disk+0x669/0x1850 [ 102.670706][ T5327] md_ioctl+0x1fe4/0x2610 [ 102.672487][ T5327] ? tomoyo_path_number_perm+0x219/0x5f0 [ 102.675009][ T5327] ? __pfx_md_ioctl+0x10/0x10 [ 102.677076][ T5327] ? do_vfs_ioctl+0x116f/0x1530 [ 102.679118][ T5327] ? __pfx_do_vfs_ioctl+0x10/0x10 [ 102.681293][ T5327] ? hook_file_ioctl+0x1f2/0x600 [ 102.683407][ T5327] ? __pfx_md_ioctl+0x10/0x10 [ 102.685428][ T5327] blkdev_ioctl+0x5e3/0x740 [ 102.687375][ T5327] ? __pfx_blkdev_ioctl+0x10/0x10 [ 102.689532][ T5327] ? __fget_files+0x2a/0x420 [ 102.691645][ T5327] ? bpf_lsm_file_ioctl+0x9/0x20 [ 102.693771][ T5327] ? __pfx_blkdev_ioctl+0x10/0x10 [ 102.695828][ T5327] __se_sys_ioctl+0xfc/0x170 [ 102.697828][ T5327] do_syscall_64+0x166/0x520 [ 102.699764][ T5327] ? trace_irq_disable+0x3b/0x140 [ 102.701907][ T5327] ? entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 102.704496][ T5327] ? clear_bhb_loop+0x70/0xc0 [ 102.706553][ T5327] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 102.709229][ T5327] RIP: 0033:0x7ff7a2d9e159 [ 102.711222][ T5327] 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 [ 102.719264][ T5327] RSP: 002b:00007ff7a3c3dfe8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 102.723020][ T5327] RAX: ffffffffffffffda RBX: 00007ff7a3026090 RCX: 00007ff7a2d9e159 [ 102.726433][ T5327] RDX: 0000200000000440 RSI: 0000000040140921 RDI: 0000000000000005 [ 102.729789][ T5327] RBP: 00007ff7a2e3503b R08: 0000000000000000 R09: 0000000000000000 [ 102.733152][ T5327] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 [ 102.736487][ T5327] R13: 00007ff7a3026128 R14: 00007ff7a3026090 R15: 00007ffc615e8688 [ 102.739971][ T5327] [ 102.760648][ T5330] md: md0: resync done. [ 102.789146][ T5327] block device autoloading is deprecated and will be removed. [ 102.790017][ T5331] md: recover of RAID array md0 [ 102.790038][ T5331] md: md0: recover done.