INFO: task kworker/0:3:13449 blocked for more than 143 seconds.
      Tainted: G             L      syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/0:3     state:D stack:22760 pid:13449 tgid:13449 ppid:2      task_flags:0x4208060 flags:0x00080000
Workqueue: events_freezable mmc_rescan
Call Trace:
 <TASK>
 __schedule+0x17d9/0x56c0
 schedule+0x164/0x2b0
 schedule_timeout+0xc0/0x2c0
 wait_for_completion+0x2ca/0x5e0
 mmc_wait_for_req_done+0x37/0x490
 mmc_wait_for_cmd+0x183/0x2a0
 sdio_reset+0xf4/0x3a0
 mmc_rescan+0x6eb/0x1040
 process_scheduled_works+0xa8e/0x14e0
 worker_thread+0xa47/0xfb0
 kthread+0x388/0x470
 ret_from_fork+0x514/0xb70
 ret_from_fork_asm+0x1a/0x30
 </TASK>
INFO: task kworker/0:7:13900 blocked for more than 143 seconds.
      Tainted: G             L      syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/0:7     state:D stack:22400 pid:13900 tgid:13900 ppid:2      task_flags:0x4288060 flags:0x00080000
Workqueue: usb_hub_wq hub_event
Call Trace:
 <TASK>
 __schedule+0x17d9/0x56c0
 schedule+0x164/0x2b0
 schedule_timeout+0xc0/0x2c0
 wait_for_completion+0x2ca/0x5e0
 __flush_work+0xa63/0xca0
 __cancel_work_sync+0xbe/0x110
 mmc_stop_host+0xd9/0x460
 mmc_remove_host+0x15/0x60
 vub300_disconnect+0x154/0x2f0
 usb_unbind_interface+0x295/0x9f0
 device_release_driver_internal+0x4f5/0x880
 bus_remove_device+0x444/0x560
 device_del+0x524/0x8f0
 usb_disable_device+0x3d4/0x8d0
 usb_disconnect+0x346/0x9a0
 hub_event+0x1bbb/0x4d30
 process_scheduled_works+0xa8e/0x14e0
 worker_thread+0xa47/0xfb0
 kthread+0x388/0x470
 ret_from_fork+0x514/0xb70
 ret_from_fork_asm+0x1a/0x30
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/34:
 #0: ffffffff8eb59c60 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
2 locks held by getty/5437:
 #0: ffff8881765520a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70
 #1: ffffc900034732e8 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x45a/0x1360
9 locks held by kworker/u8:8/12067:
2 locks held by kworker/0:3/13449:
 #0: ffff88810006a140 ((wq_completion)events_freezable){+.+.}-{0:0}, at: process_scheduled_works+0xa20/0x14e0
 #1: ffffc90024cffc40 ((work_completion)(&(&host->detect)->work)){+.+.}-{0:0}, at: process_scheduled_works+0xa20/0x14e0
5 locks held by kworker/0:7/13900:
 #0: ffff8881680dcd40 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_scheduled_works+0xa20/0x14e0
 #1: ffffc9000538fc40 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_scheduled_works+0xa20/0x14e0
 #2: ffff8881091c91d8 (&dev->mutex){....}-{4:4}, at: hub_event+0x184/0x4d30
 #3: ffff88810fef41d8 (&dev->mutex){....}-{4:4}, at: usb_disconnect+0xfc/0x9a0
 #4: ffff888111e921a0 (&dev->mutex){....}-{4:4}, at: device_release_driver_internal+0xb9/0x880
4 locks held by udevd/14187:
 #0: ffff88817712f518 (&p->lock){+.+.}-{4:4}, at: seq_read_iter+0xa4/0xca0
 #1: ffff888170fd5c80 (&of->mutex#2){+.+.}-{4:4}, at: kernfs_seq_start+0x5d/0x420
 #2: ffff888115261008 (kn->active#32){++++}-{0:0}, at: kernfs_seq_start+0xb2/0x420
 #3: ffff88810fef41d8 (&dev->mutex){....}-{4:4}, at: product_show+0x26/0xa0

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

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/0x380
 sys_info+0x135/0x170
 watchdog+0xfd7/0x1030
 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: 17296 Comm: syz-executor 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:unwind_next_frame+0x1f6/0x2550
Code: 08 8b 15 7d 49 d8 0c 8d 42 ff 44 39 f8 0f 86 6c 04 00 00 44 89 f8 4c 8d 2c 85 9c 08 9e 91 4c 89 e8 48 c1 e8 03 42 0f b6 04 20 <84> c0 4c 89 e3 0f 85 66 1d 00 00 45 8b 6d 00 44 89 f8 ff c0 4c 8d
RSP: 0018:ffffc9000888f8a8 EFLAGS: 00000a03
RAX: 0000000000000000 RBX: 0000000000000001 RCX: 0000000080000000
RDX: 00000000000ad526 RSI: ffffffff8c4bdd60 RDI: ffffffff8c4bdd20
RBP: ffffffff8177bcfc R08: ffffffff8177927f R09: 0000000000000000
R10: 0000000000000000 R11: ffffffff8eb59c60 R12: dffffc0000000000
R13: ffffffff919fe78c R14: ffffc9000888f9a8 R15: 00000000000077bc
FS:  0000555568a62500(0000) GS:ffff8882a8f4b000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000555568a7da28 CR3: 000000010906e000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 __unwind_start+0x514/0x660
 arch_stack_walk+0xe3/0x150
 stack_trace_save+0xa9/0x100
 kasan_save_track+0x3e/0x80
 __kasan_slab_alloc+0x6c/0x80
 kmem_cache_alloc_noprof+0x2a0/0x5f0
 do_getname+0x2e/0x250
 user_path_at+0x2a/0x160
 __x64_sys_umount+0xf6/0x170
 do_syscall_64+0x174/0x580
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f6c7939f257
Code: a2 c7 05 9c 44 25 00 00 00 00 00 eb 96 e8 e1 12 00 00 90 31 f6 e9 09 00 00 00 66 0f 1f 84 00 00 00 00 00 b8 a6 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 01 c3 48 c7 c2 e8 ff ff ff f7 d8 64 89 02 b8
RSP: 002b:00007ffee7a33b08 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f6c7939f257
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffee7a33bc0
RBP: 00007ffee7a33bc0 R08: 00007ffee7a34bc0 R09: 00000000ffffffff
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffee7a34c50
R13: 00007f6c7943445c R14: 00000000002ee2c6 R15: 00007ffee7a34c90
 </TASK>
