INFO: task syz.0.1593:14242 blocked for more than 143 seconds.
      Tainted: G             L      syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.0.1593      state:D stack:25464 pid:14242 tgid:14241 ppid:13037  task_flags:0x400140 flags:0x00080002
Call Trace:
 <TASK>
 __schedule+0x17b4/0x5680
 schedule+0x164/0x360
 schedule_preempt_disabled+0x13/0x30
 __mutex_lock+0x7f7/0x1550
 usbdev_open+0x182/0x770
 chrdev_open+0x4cd/0x5e0
 do_dentry_open+0x822/0x13a0
 vfs_open+0x3b/0x340
 path_openat+0x2e08/0x3860
 do_file_open+0x23e/0x4a0
 do_sys_openat2+0x113/0x200
 __x64_sys_openat+0x138/0x170
 do_syscall_64+0x15f/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fe10cf5d60e
RSP: 002b:00007fe10deaeb28 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007fe10deaf6c0 RCX: 00007fe10cf5d60e
RDX: 0000000000000082 RSI: 00007fe10deaec00 RDI: ffffffffffffff9c
RBP: 00007fe10deaec00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: cccccccccccccccd
R13: 00007fe10d216038 R14: 00007fe10d215fa0 R15: 00007fff271102e8
 </TASK>

Showing all locks held in the system:
6 locks held by kworker/0:0/9:
 #0: ffff8881052b7140 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_scheduled_works+0xa35/0x1860
 #1: ffffc900000e7c40 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_scheduled_works+0xa70/0x1860
 #2: ffff88816b1f61d8 (&dev->mutex){....}-{4:4}, at: hub_event+0x17f/0x4f30
 #3: ffff8880236bb1d8 (&dev->mutex){....}-{4:4}, at: __device_attach+0x88/0x450
 #4: ffff88811242b1a0 (&dev->mutex){....}-{4:4}, at: __device_attach+0x88/0x450
 #5: ffffffff8e7f9b28 (umhelper_sem){++++}-{4:4}, at: usermodehelper_read_trylock+0xfc/0x2c0
1 lock held by khungtaskd/34:
 #0: ffffffff8e95cda0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
1 lock held by klogd/5048:
 #0: ffff88812103b020 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x31/0x150
2 locks held by getty/5435:
 #0: ffff8881721860a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70
 #1: ffffc9000346b2e8 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x45c/0x13a0
5 locks held by kworker/1:6/6209:
 #0: ffff8881052b7140 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_scheduled_works+0xa35/0x1860
 #1: ffffc900076c7c40 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_scheduled_works+0xa70/0x1860
 #2: ffff88816b2561d8 (&dev->mutex){....}-{4:4}, at: hub_event+0x17f/0x4f30
 #3: ffff888161eb81d8 (&dev->mutex){....}-{4:4}, at: __device_attach+0x88/0x450
 #4: ffff888170c8b1a0 (&dev->mutex){....}-{4:4}, at: __device_attach+0x88/0x450
4 locks held by udevd/6327:
 #0: ffff88811263dcf8 (&p->lock){+.+.}-{4:4}, at: seq_read_iter+0xb7/0xe10
 #1: ffff88810d41a480 (&of->mutex#2){+.+.}-{4:4}, at: kernfs_seq_start+0x5c/0x420
 #2: ffff88811632e3c8 (kn->active#29){.+.+}-{0:0}, at: kernfs_seq_start+0xb2/0x420
 #3: ffff8880236bb1d8 (&dev->mutex){....}-{4:4}, at: manufacturer_show+0x26/0xa0
4 locks held by udevd/8541:
 #0: ffff88801cafa998 (&p->lock){+.+.}-{4:4}, at: seq_read_iter+0xb7/0xe10
 #1: ffff88801c91c080 (&of->mutex#2){+.+.}-{4:4}, at: kernfs_seq_start+0x5c/0x420
 #2: ffff8881940e3008 (kn->active#29){.+.+}-{0:0}, at: kernfs_seq_start+0xb2/0x420
 #3: ffff888161eb81d8 (&dev->mutex){....}-{4:4}, at: manufacturer_show+0x26/0xa0
2 locks held by kworker/u10:16/11655:
 #0: ffff88823c63b020 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x31/0x150
 #1: ffff88823c624588 (psi_seq){-.-.}-{0:0}, at: psi_task_switch+0x53/0x880
1 lock held by syz.0.1593/14242:
 #0: ffff88816b1f61d8 (&dev->mutex){....}-{4:4}, at: usbdev_open+0x182/0x770
2 locks held by dhcpcd/17555:
 #0: ffff888023024260 (sk_lock-AF_PACKET){+.+.}-{0:0}, at: packet_do_bind+0x33/0xe10
 #1: ffffffff8e9630a8 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x2d0/0x770

=============================================

NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 34 Comm: khungtaskd Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
Call Trace:
 <TASK>
 dump_stack_lvl+0xe8/0x150
 nmi_cpu_backtrace+0x274/0x2d0
 nmi_trigger_cpumask_backtrace+0x17a/0x300
 sys_info+0x135/0x170
 watchdog+0xfd3/0x1030
 kthread+0x388/0x470
 ret_from_fork+0x514/0xb70
 ret_from_fork_asm+0x1a/0x30
 </TASK>
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 5048 Comm: klogd Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
RIP: 0010:_raw_spin_lock_irqsave+0x4c/0x60
Code: e8 f5 49 8d 7e 18 31 f6 31 d2 31 c9 41 b8 01 00 00 00 45 31 c9 ff 74 24 10 e8 60 ce f6 f5 48 83 c4 08 4c 89 f7 e8 a4 6f f7 f5 <48> 89 d8 5b 41 5e c3 cc cc cc cc cc 0f 1f 84 00 00 00 00 00 90 90
RSP: 0018:ffffc90007b6f528 EFLAGS: 00000046
RAX: 31a73ab95992a500 RBX: 0000000000000046 RCX: 0000000000000001
RDX: 0000000000000001 RSI: 0000000000000004 RDI: ffffc90007b6f4a0
RBP: ffff88823c628340 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff52000f6de94 R12: 1ffff110478c5068
R13: dffffc0000000000 R14: ffff88823c628280 R15: ffff88823c63bd40
FS:  00007f56c7edc380(0000) GS:ffff8882a9290000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffdfcbe9548 CR3: 0000000113cfe000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 hrtimer_start_range_ns+0xc3/0xed0
 finish_task_switch+0x3cd/0xbe0
 __schedule+0x17bc/0x5680
 schedule+0x164/0x360
 schedule_timeout+0xc3/0x2c0
 unix_wait_for_peer+0x1f5/0x2f0
 unix_dgram_sendmsg+0xb73/0x18d0
 __sys_sendto+0x672/0x710
 __x64_sys_sendto+0xde/0x100
 do_syscall_64+0x15f/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f56c803e9b5
Code: 8b 44 24 08 48 83 c4 28 48 98 c3 48 98 c3 41 89 ca 64 8b 04 25 18 00 00 00 85 c0 75 26 45 31 c9 45 31 c0 b8 2c 00 00 00 0f 05 <48> 3d 00 f0 ff ff 76 7a 48 8b 15 44 c4 0c 00 f7 d8 64 89 02 48 83
RSP: 002b:00007ffe73a04ad8 EFLAGS: 00000246 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 00007f56c803e9b5
RDX: 0000000000000053 RSI: 000055ebe4207830 RDI: 0000000000000003
RBP: 000055ebe41ff910 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000004000 R11: 0000000000000246 R12: 0000000000000013
R13: 00007f56c81cc212 R14: 00007ffe73a04bd8 R15: 0000000000000000
 </TASK>
