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") [ 86.737287][ T46] Bluetooth: hci0: command tx timeout [ 86.749932][ T1364] cfg80211: failed to load regulatory.db [ 86.943581][ T5322] md: async del_gendisk mode will be removed in future, please upgrade to mdadm-4.5+ [ 86.945090][ T5323] md: async del_gendisk mode will be removed in future, please upgrade to mdadm-4.5+ [ 86.946169][ T5323] block device autoloading is deprecated and will be removed. [ 87.040568][ T5322] md/raid10:md0: not clean -- starting background reconstruction [ 87.040613][ T5322] md/raid10:md0: active with 1 out of 2 devices [ 87.052313][ T5322] md0: detected capacity change from 0 to 2048 [ 87.065816][ T5323] [ 87.066983][ T5323] ====================================================== [ 87.070223][ T5323] WARNING: possible circular locking dependency detected [ 87.074068][ T5323] syzkaller #0 Not tainted [ 87.076612][ T5323] ------------------------------------------------------ [ 87.079461][ T5323] syz.0.0/5323 is trying to acquire lock: [ 87.081913][ T5323] ffffffff8f556400 (major_names_lock){+.+.}-{4:4}, at: blk_request_module+0x35/0x2a0 [ 87.085953][ T5323] [ 87.085953][ T5323] but task is already holding lock: [ 87.089271][ T5323] ffff888036bcc358 (&mddev->reconfig_mutex){+.+.}-{4:4}, at: mddev_suspend_and_lock+0x48/0xf0 [ 87.094149][ T5323] [ 87.094149][ T5323] which lock already depends on the new lock. [ 87.094149][ T5323] [ 87.099554][ T5323] [ 87.099554][ T5323] the existing dependency chain (in reverse order) is: [ 87.104745][ T5323] [ 87.104745][ T5323] -> #3 (&mddev->reconfig_mutex){+.+.}-{4:4}: [ 87.108468][ T5323] __mutex_lock+0x19d/0x1550 [ 87.110828][ T5323] md_start_sync+0x179/0x1010 [ 87.113273][ T5323] process_scheduled_works+0xc3d/0x1630 [ 87.116060][ T5323] worker_thread+0xa47/0xfb0 [ 87.118277][ T5323] kthread+0x38b/0x480 [ 87.120341][ T5323] ret_from_fork+0x514/0xb70 [ 87.122716][ T5323] ret_from_fork_asm+0x1a/0x30 [ 87.125614][ T5323] [ 87.125614][ T5323] -> #2 ((work_completion)(&mddev->sync_work)){+.+.}-{0:0}: [ 87.130685][ T5323] process_scheduled_works+0xc03/0x1630 [ 87.133602][ T5323] worker_thread+0xa47/0xfb0 [ 87.135680][ T5323] kthread+0x38b/0x480 [ 87.137554][ T5323] ret_from_fork+0x514/0xb70 [ 87.139606][ T5323] ret_from_fork_asm+0x1a/0x30 [ 87.141898][ T5323] [ 87.141898][ T5323] -> #1 ((wq_completion)md_misc){+.+.}-{0:0}: [ 87.145660][ T5323] touch_wq_lockdep_map+0xcb/0x180 [ 87.148297][ T5323] __flush_workqueue+0x148/0x1470 [ 87.151021][ T5323] md_alloc+0x32/0xf20 [ 87.153175][ T5323] md_alloc_and_put+0x1a/0x1f0 [ 87.155655][ T5323] blk_request_module+0x27d/0x2a0 [ 87.158299][ T5323] blkdev_get_no_open+0x3f/0xe0 [ 87.160949][ T5323] blkdev_open+0x1d7/0x600 [ 87.163006][ T5323] do_dentry_open+0x816/0x1380 [ 87.165095][ T5323] vfs_open+0x3b/0x340 [ 87.167060][ T5323] path_openat+0x1443/0x1d60 [ 87.168941][ T5323] do_file_open+0x23e/0x4a0 [ 87.170970][ T5323] do_sys_openat2+0x115/0x200 [ 87.172924][ T5323] __x64_sys_openat+0x138/0x170 [ 87.174952][ T5323] do_syscall_64+0x166/0x520 [ 87.176885][ T5323] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 87.179601][ T5323] [ 87.179601][ T5323] -> #0 (major_names_lock){+.+.}-{4:4}: [ 87.182467][ T5323] __lock_acquire+0x164c/0x2de0 [ 87.184485][ T5323] lock_acquire+0x115/0x350 [ 87.186456][ T5323] __mutex_lock+0x19d/0x1550 [ 87.188346][ T5323] blk_request_module+0x35/0x2a0 [ 87.190317][ T5323] blkdev_get_no_open+0x3f/0xe0 [ 87.192412][ T5323] bdev_file_open_by_dev+0xa0/0x240 [ 87.194576][ T5323] md_import_device+0x2e9/0x650 [ 87.196766][ T5323] md_add_new_disk+0x669/0x1850 [ 87.199250][ T5323] md_ioctl+0x1fe4/0x2610 [ 87.201930][ T5323] blkdev_ioctl+0x5e3/0x740 [ 87.204883][ T5323] __se_sys_ioctl+0xfc/0x170 [ 87.207856][ T5323] do_syscall_64+0x166/0x520 [ 87.210198][ T5323] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 87.213057][ T5323] [ 87.213057][ T5323] other info that might help us debug this: [ 87.213057][ T5323] [ 87.217628][ T5323] Chain exists of: [ 87.217628][ T5323] major_names_lock --> (work_completion)(&mddev->sync_work) --> &mddev->reconfig_mutex [ 87.217628][ T5323] [ 87.224581][ T5323] Possible unsafe locking scenario: [ 87.224581][ T5323] [ 87.227959][ T5323] CPU0 CPU1 [ 87.230407][ T5323] ---- ---- [ 87.232893][ T5323] lock(&mddev->reconfig_mutex); [ 87.235663][ T5323] lock((work_completion)(&mddev->sync_work)); [ 87.240556][ T5323] lock(&mddev->reconfig_mutex); [ 87.244101][ T5323] lock(major_names_lock); [ 87.246481][ T5323] [ 87.246481][ T5323] *** DEADLOCK *** [ 87.246481][ T5323] [ 87.250122][ T5323] locks held by syz.0.0/5323: 1, last CPU#0: [ 87.252682][ T5323] #0: ffff888036bcc358 (&mddev->reconfig_mutex){+.+.}-{4:4}, at: mddev_suspend_and_lock+0x48/0xf0 [ 87.257174][ T5323] [ 87.257174][ T5323] stack backtrace: [ 87.259703][ T5323] CPU: 0 UID: 0 PID: 5323 Comm: syz.0.0 Not tainted syzkaller #0 PREEMPT(full) [ 87.263699][ T5323] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [ 87.268816][ T5323] Call Trace: [ 87.270531][ T5323] [ 87.271911][ T5323] dump_stack_lvl+0xe8/0x150 [ 87.274104][ T5323] print_circular_bug+0x2e2/0x300 [ 87.276512][ T5323] check_noncircular+0x12f/0x150 [ 87.278792][ T5323] __lock_acquire+0x164c/0x2de0 [ 87.280927][ T5323] ? post_alloc_hook+0x208/0x250 [ 87.283135][ T5323] ? get_page_from_freelist+0x2209/0x2280 [ 87.285799][ T5323] lock_acquire+0x115/0x350 [ 87.288553][ T5323] ? blk_request_module+0x35/0x2a0 [ 87.291627][ T5323] __mutex_lock+0x19d/0x1550 [ 87.293654][ T5323] ? blk_request_module+0x35/0x2a0 [ 87.295899][ T5323] ? lock_acquire+0x115/0x350 [ 87.297969][ T5323] ? blk_request_module+0x35/0x2a0 [ 87.300255][ T5323] ? __pfx___mutex_lock+0x10/0x10 [ 87.302422][ T5323] ? find_inode_fast+0x5dc/0x740 [ 87.304565][ T5323] ? find_inode_fast+0xd2/0x740 [ 87.306696][ T5323] blk_request_module+0x35/0x2a0 [ 87.308887][ T5323] blkdev_get_no_open+0x3f/0xe0 [ 87.311261][ T5323] bdev_file_open_by_dev+0xa0/0x240 [ 87.314063][ T5323] md_import_device+0x2e9/0x650 [ 87.316878][ T5323] md_add_new_disk+0x669/0x1850 [ 87.319186][ T5323] md_ioctl+0x1fe4/0x2610 [ 87.321111][ T5323] ? tomoyo_path_number_perm+0x219/0x5f0 [ 87.323617][ T5323] ? __pfx_md_ioctl+0x10/0x10 [ 87.325617][ T5323] ? do_vfs_ioctl+0x116f/0x1530 [ 87.327751][ T5323] ? __pfx_do_vfs_ioctl+0x10/0x10 [ 87.329795][ T5323] ? hook_file_ioctl+0x1f2/0x600 [ 87.331924][ T5323] ? __pfx_md_ioctl+0x10/0x10 [ 87.333927][ T5323] blkdev_ioctl+0x5e3/0x740 [ 87.335962][ T5323] ? __pfx_blkdev_ioctl+0x10/0x10 [ 87.338475][ T5323] ? __fget_files+0x2a/0x420 [ 87.341123][ T5323] ? bpf_lsm_file_ioctl+0x9/0x20 [ 87.343622][ T5323] ? __pfx_blkdev_ioctl+0x10/0x10 [ 87.345956][ T5323] __se_sys_ioctl+0xfc/0x170 [ 87.348084][ T5323] do_syscall_64+0x166/0x520 [ 87.350413][ T5323] ? trace_irq_disable+0x3b/0x140 [ 87.353015][ T5323] ? entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 87.355980][ T5323] ? clear_bhb_loop+0x70/0xc0 [ 87.358266][ T5323] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 87.360921][ T5323] RIP: 0033:0x7fedac79e159 [ 87.362794][ T5323] 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 [ 87.372052][ T5323] RSP: 002b:00007feda8bd3fe8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 87.375890][ T5323] RAX: ffffffffffffffda RBX: 00007fedaca26090 RCX: 00007fedac79e159 [ 87.379984][ T5323] RDX: 0000200000000440 RSI: 0000000040140921 RDI: 0000000000000005 [ 87.383719][ T5323] RBP: 00007fedac83506b R08: 0000000000000000 R09: 0000000000000000 [ 87.387421][ T5323] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 [ 87.391411][ T5323] R13: 00007fedaca26128 R14: 00007fedaca26090 R15: 00007ffe2898b928 [ 87.395230][ T5323] [ 87.398545][ T5326] md: resync of RAID array md0 [ 87.414479][ T5326] md: md0: resync done. [ 87.463255][ T5323] block device autoloading is deprecated and will be removed. [ 87.463959][ T5327] md: recover of RAID array md0 [ 87.463990][ T5327] md: md0: recover done.