program: io_uring_setup(0x115a, &(0x7f0000000440)={0x0, 0x4ef1, 0x400, 0x400001, 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") ioctl$BTRFS_IOC_LOGICAL_INO_V2(0xffffffffffffffff, 0xc038943b, &(0x7f0000000240)={0xbca, 0x8, '\x00', 0x0, &(0x7f00000001c0)=[0x0]}) mount(&(0x7f0000000280)=@filename='./sys\x00', &(0x7f00000002c0)='./dev/file0\x00', &(0x7f0000000340)='binfmt_misc\x00', 0x881010, &(0x7f00000004c0)='\'^*\xbb\x00') socket$nl_generic(0x10, 0x3, 0x10) [ 93.920926][ T5285] Bluetooth: hci0: command tx timeout [ 94.169569][ T5321] md: async del_gendisk mode will be removed in future, please upgrade to mdadm-4.5+ [ 94.176458][ T5322] md: async del_gendisk mode will be removed in future, please upgrade to mdadm-4.5+ [ 94.176588][ T5322] block device autoloading is deprecated and will be removed. [ 94.250044][ T5321] md/raid10:md0: not clean -- starting background reconstruction [ 94.250065][ T5321] md/raid10:md0: active with 1 out of 2 devices [ 94.259676][ T5321] md0: detected capacity change from 0 to 2048 [ 94.274842][ T5328] md: resync of RAID array md0 [ 94.283708][ T5322] [ 94.286956][ T5322] ====================================================== [ 94.289884][ T5322] WARNING: possible circular locking dependency detected [ 94.292930][ T5322] syzkaller #0 Not tainted [ 94.294759][ T5322] ------------------------------------------------------ [ 94.297796][ T5322] syz.0.0/5322 is trying to acquire lock: [ 94.300363][ T5322] ffffffff8f555740 (major_names_lock){+.+.}-{4:4}, at: blk_request_module+0x35/0x2a0 [ 94.304567][ T5322] [ 94.304567][ T5322] but task is already holding lock: [ 94.307639][ T5322] ffff888012cb0358 (&mddev->reconfig_mutex){+.+.}-{4:4}, at: mddev_suspend_and_lock+0x48/0xf0 [ 94.312168][ T5322] [ 94.312168][ T5322] which lock already depends on the new lock. [ 94.312168][ T5322] [ 94.316721][ T5322] [ 94.316721][ T5322] the existing dependency chain (in reverse order) is: [ 94.320674][ T5322] [ 94.320674][ T5322] -> #3 (&mddev->reconfig_mutex){+.+.}-{4:4}: [ 94.324143][ T5322] __mutex_lock+0x19d/0x1550 [ 94.326393][ T5322] md_start_sync+0x179/0x1010 [ 94.328714][ T5322] process_scheduled_works+0xc3d/0x1630 [ 94.331345][ T5322] worker_thread+0xa47/0xfb0 [ 94.333555][ T5322] kthread+0x38b/0x480 [ 94.335611][ T5322] ret_from_fork+0x514/0xb70 [ 94.337870][ T5322] ret_from_fork_asm+0x1a/0x30 [ 94.340203][ T5322] [ 94.340203][ T5322] -> #2 ((work_completion)(&mddev->sync_work)){+.+.}-{0:0}: [ 94.344297][ T5322] process_scheduled_works+0xc03/0x1630 [ 94.347003][ T5322] worker_thread+0xa47/0xfb0 [ 94.349254][ T5322] kthread+0x38b/0x480 [ 94.351305][ T5322] ret_from_fork+0x514/0xb70 [ 94.353370][ T5322] ret_from_fork_asm+0x1a/0x30 [ 94.355605][ T5322] [ 94.355605][ T5322] -> #1 ((wq_completion)md_misc){+.+.}-{0:0}: [ 94.359118][ T5322] touch_wq_lockdep_map+0xcb/0x180 [ 94.361593][ T5322] __flush_workqueue+0x148/0x1470 [ 94.364045][ T5322] md_alloc+0x32/0xf20 [ 94.366193][ T5322] md_alloc_and_put+0x1a/0x1f0 [ 94.369467][ T5322] blk_request_module+0x27d/0x2a0 [ 94.372555][ T5322] blkdev_get_no_open+0x3f/0xe0 [ 94.375223][ T5322] blkdev_open+0x1d7/0x600 [ 94.377748][ T5322] do_dentry_open+0x816/0x1380 [ 94.380228][ T5322] vfs_open+0x3b/0x340 [ 94.382401][ T5322] path_openat+0x1443/0x1d60 [ 94.384684][ T5322] do_file_open+0x23e/0x4a0 [ 94.386959][ T5322] do_sys_openat2+0x115/0x200 [ 94.389227][ T5322] __x64_sys_openat+0x138/0x170 [ 94.391610][ T5322] do_syscall_64+0x166/0x520 [ 94.393883][ T5322] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 94.396788][ T5322] [ 94.396788][ T5322] -> #0 (major_names_lock){+.+.}-{4:4}: [ 94.400070][ T5322] __lock_acquire+0x164c/0x2de0 [ 94.402519][ T5322] lock_acquire+0x115/0x350 [ 94.404815][ T5322] __mutex_lock+0x19d/0x1550 [ 94.407235][ T5322] blk_request_module+0x35/0x2a0 [ 94.409779][ T5322] blkdev_get_no_open+0x3f/0xe0 [ 94.412257][ T5322] bdev_file_open_by_dev+0xa0/0x240 [ 94.414855][ T5322] md_import_device+0x2e9/0x650 [ 94.417812][ T5322] md_add_new_disk+0x669/0x1850 [ 94.420520][ T5322] md_ioctl+0x1fe4/0x2610 [ 94.422562][ T5322] blkdev_ioctl+0x5e3/0x740 [ 94.424631][ T5322] __se_sys_ioctl+0xfc/0x170 [ 94.426811][ T5322] do_syscall_64+0x166/0x520 [ 94.428928][ T5322] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 94.431733][ T5322] [ 94.431733][ T5322] other info that might help us debug this: [ 94.431733][ T5322] [ 94.436205][ T5322] Chain exists of: [ 94.436205][ T5322] major_names_lock --> (work_completion)(&mddev->sync_work) --> &mddev->reconfig_mutex [ 94.436205][ T5322] [ 94.442888][ T5322] Possible unsafe locking scenario: [ 94.442888][ T5322] [ 94.446067][ T5322] CPU0 CPU1 [ 94.448419][ T5322] ---- ---- [ 94.450851][ T5322] lock(&mddev->reconfig_mutex); [ 94.453043][ T5322] lock((work_completion)(&mddev->sync_work)); [ 94.456951][ T5322] lock(&mddev->reconfig_mutex); [ 94.460456][ T5322] lock(major_names_lock); [ 94.462467][ T5322] [ 94.462467][ T5322] *** DEADLOCK *** [ 94.462467][ T5322] [ 94.465842][ T5322] locks held by syz.0.0/5322: 1, last CPU#0: [ 94.468501][ T5322] #0: ffff888012cb0358 (&mddev->reconfig_mutex){+.+.}-{4:4}, at: mddev_suspend_and_lock+0x48/0xf0 [ 94.473040][ T5322] [ 94.473040][ T5322] stack backtrace: [ 94.475585][ T5322] CPU: 0 UID: 0 PID: 5322 Comm: syz.0.0 Not tainted syzkaller #0 PREEMPT(full) [ 94.479449][ T5322] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [ 94.484407][ T5322] Call Trace: [ 94.486030][ T5322] [ 94.487489][ T5322] dump_stack_lvl+0xe8/0x150 [ 94.489580][ T5322] print_circular_bug+0x2e2/0x300 [ 94.491758][ T5322] check_noncircular+0x12f/0x150 [ 94.493918][ T5322] __lock_acquire+0x164c/0x2de0 [ 94.495955][ T5322] ? post_alloc_hook+0x208/0x250 [ 94.498125][ T5322] ? get_page_from_freelist+0x2209/0x2280 [ 94.500505][ T5322] lock_acquire+0x115/0x350 [ 94.502290][ T5322] ? blk_request_module+0x35/0x2a0 [ 94.504420][ T5322] __mutex_lock+0x19d/0x1550 [ 94.506366][ T5322] ? blk_request_module+0x35/0x2a0 [ 94.508556][ T5322] ? lock_acquire+0x115/0x350 [ 94.510721][ T5322] ? blk_request_module+0x35/0x2a0 [ 94.513080][ T5322] ? __pfx___mutex_lock+0x10/0x10 [ 94.515373][ T5322] ? find_inode_fast+0x5dc/0x740 [ 94.517732][ T5322] ? find_inode_fast+0xd2/0x740 [ 94.519855][ T5322] blk_request_module+0x35/0x2a0 [ 94.522162][ T5322] blkdev_get_no_open+0x3f/0xe0 [ 94.524282][ T5322] bdev_file_open_by_dev+0xa0/0x240 [ 94.526601][ T5322] md_import_device+0x2e9/0x650 [ 94.528901][ T5322] md_add_new_disk+0x669/0x1850 [ 94.531181][ T5322] md_ioctl+0x1fe4/0x2610 [ 94.533069][ T5322] ? tomoyo_path_number_perm+0x219/0x5f0 [ 94.535727][ T5322] ? __pfx_md_ioctl+0x10/0x10 [ 94.537891][ T5322] ? do_vfs_ioctl+0x116f/0x1530 [ 94.540360][ T5322] ? __pfx_do_vfs_ioctl+0x10/0x10 [ 94.542749][ T5322] ? hook_file_ioctl+0x1f2/0x600 [ 94.544981][ T5322] ? __pfx_md_ioctl+0x10/0x10 [ 94.547274][ T5322] blkdev_ioctl+0x5e3/0x740 [ 94.549606][ T5322] ? __pfx_blkdev_ioctl+0x10/0x10 [ 94.551875][ T5322] ? __fget_files+0x2a/0x420 [ 94.553890][ T5322] ? bpf_lsm_file_ioctl+0x9/0x20 [ 94.556051][ T5322] ? __pfx_blkdev_ioctl+0x10/0x10 [ 94.558332][ T5322] __se_sys_ioctl+0xfc/0x170 [ 94.560404][ T5322] do_syscall_64+0x166/0x520 [ 94.562569][ T5322] ? trace_irq_disable+0x3b/0x140 [ 94.564872][ T5322] ? entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 94.567746][ T5322] ? clear_bhb_loop+0x70/0xc0 [ 94.569998][ T5322] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 94.572730][ T5322] RIP: 0033:0x7f100d39e159 [ 94.574743][ T5322] 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 [ 94.583368][ T5322] RSP: 002b:00007f100e302fe8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 94.586918][ T5322] RAX: ffffffffffffffda RBX: 00007f100d626090 RCX: 00007f100d39e159 [ 94.590388][ T5322] RDX: 0000200000000440 RSI: 0000000040140921 RDI: 0000000000000005 [ 94.593841][ T5322] RBP: 00007f100d43506b R08: 0000000000000000 R09: 0000000000000000 [ 94.597253][ T5322] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 [ 94.600770][ T5322] R13: 00007f100d626128 R14: 00007f100d626090 R15: 00007ffff5b1d808 [ 94.604543][ T5322] [ 94.645585][ T5328] md: md0: resync done. [ 94.658342][ T5322] block device autoloading is deprecated and will be removed.