INFO: task syz.0.1421:11462 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.0.1421      state:D stack:26440 pid:11462 tgid:11461 ppid:10239  task_flags:0x400140 flags:0x00080002
Call Trace:
 <TASK>
 __schedule+0x15dd/0x5300
 schedule+0x164/0x360
 schedule_preempt_disabled+0x13/0x30
 __mutex_lock+0x7fe/0x1300
 bdev_open+0xe0/0xd30
 blkdev_open+0x470/0x610
 do_dentry_open+0x785/0x14e0
 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+0x14d/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7ff68eb5cfce
RSP: 002b:00007ff68fa94b28 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007ff68fa956c0 RCX: 00007ff68eb5cfce
RDX: 0000000000004300 RSI: 00007ff68fa94c00 RDI: ffffffffffffff9c
RBP: 00007ff68fa94c00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: cccccccccccccccd
R13: 00007ff68ee16038 R14: 00007ff68ee15fa0 R15: 00007ffe8b8fc3d8
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/34:
 #0: ffffffff8e75e560 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
2 locks held by getty/5632:
 #0: ffff888113c9a0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70
 #1: ffffc9000356b2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x45c/0x13c0
1 lock held by udevd/5822:
 #0: ffff88816b8f2358 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_open+0xe0/0xd30
3 locks held by kworker/0:5/5876:
 #0: ffff8881688aa148 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_scheduled_works+0xa52/0x18c0
 #1: ffffc90006f8fc40 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_scheduled_works+0xa8d/0x18c0
 #2: ffff88810b19c198 (&dev->mutex){....}-{4:4}, at: hub_event+0x17f/0x4f30
1 lock held by syz.0.1421/11462:
 #0: ffff88816b8f2358 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_open+0xe0/0xd30
1 lock held by syz.1.2052/14920:
 #0: ffff88812059d608 (&sb->s_type->i_mutex_key#14){+.+.}-{4:4}, at: sock_close+0x9b/0x240

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

NMI backtrace for cpu 1
CPU: 1 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+0xfd9/0x1030
 kthread+0x388/0x470
 ret_from_fork+0x51e/0xb90
 ret_from_fork_asm+0x1a/0x30
 </TASK>
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 0 Comm: swapper/0 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:timerqueue_add+0xc5/0x200
Code: 74 08 4c 89 ff e8 bb f0 86 f6 4d 8b 3f b3 01 48 8d 7d 18 48 89 f8 48 c1 e8 03 42 80 3c 28 00 74 05 e8 9f f0 86 f6 4c 8b 65 18 <4c> 89 ff 4c 89 e6 e8 30 b3 1d f6 45 31 f6 4d 39 e7 41 0f 9c c6 4e
RSP: 0018:ffffc90000007cf0 EFLAGS: 00000046
RAX: 1ffff920007cafab RBX: 1ffff11024205000 RCX: ffffffff8e494ec0
RDX: 0000000000010000 RSI: 00000067da0e4600 RDI: ffffc90003e57d58
RBP: ffffc90003e57d40 R08: ffffffff9011e3b7 R09: 1ffffffff2023c76
R10: dffffc0000000000 R11: fffffbfff2023c77 R12: 00000067da16a6b3
R13: dffffc0000000000 R14: 0000000000000000 R15: 00000067dacb59cb
FS:  0000000000000000(0000) GS:ffff88818de63000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055b27ae01000 CR3: 0000000025c16000 CR4: 00000000000006f0
Call Trace:
 <IRQ>
 __hrtimer_run_queues+0x650/0xcc0
 hrtimer_interrupt+0x42b/0x1010
 __sysvec_apic_timer_interrupt+0x102/0x460
 sysvec_apic_timer_interrupt+0xa1/0xc0
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:pv_native_safe_halt+0xf/0x20
Code: 4e 6f 02 c3 cc cc cc cc cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa eb 07 0f 00 2d e3 53 1d 00 fb f4 <e9> fc e6 02 00 cc cc cc cc cc cc cc cc cc cc cc cc 90 90 90 90 90
RSP: 0018:ffffffff8e407dc0 EFLAGS: 00000206
RAX: 00000000003b316f RBX: ffffffff819a855a RCX: 0000000080000001
RDX: 0000000000000001 RSI: ffffffff8defc347 RDI: ffffffff8c27f200
RBP: ffffffff8e407eb0 R08: ffff88812103395b R09: 1ffff1102420672b
R10: dffffc0000000000 R11: ffffed102420672c R12: ffffffff9011e3b0
R13: 0000000000000000 R14: 0000000000000000 R15: 1ffffffff1c929d8
 default_idle+0x9/0x20
 default_idle_call+0x72/0xb0
 do_idle+0x1ba/0x5d0
 cpu_startup_entry+0x43/0x60
 rest_init+0x2de/0x300
 start_kernel+0x38a/0x3e0
 x86_64_start_reservations+0x24/0x30
 x86_64_start_kernel+0x143/0x1c0
 common_startup_64+0x13e/0x147
 </TASK>
