INFO: task syz.9.1574:13378 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.9.1574      state:D stack:26216 pid:13378 tgid:13377 ppid:12074  task_flags:0x400140 flags:0x00080002
Call Trace:
 <TASK>
 __schedule+0x16e2/0x53f0
 schedule+0x164/0x360
 schedule_preempt_disabled+0x13/0x30
 rwsem_down_read_slowpath+0x61b/0x920
 down_read+0x99/0x2e0
 super_lock+0x2d6/0x3d0
 __iterate_supers+0x120/0x280
 __ia32_sys_sync+0xa0/0x120
 do_syscall_64+0x170/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fc9cf39e019
RSP: 002b:00007fc9d02a5028 EFLAGS: 00000246 ORIG_RAX: 00000000000000a2
RAX: ffffffffffffffda RBX: 00007fc9cf625fa0 RCX: 00007fc9cf39e019
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007fc9cf625fa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fc9cf626038 R14: 00007fc9cf625fa0 R15: 00007ffed1e08158
 </TASK>
INFO: task syz.9.1574:13380 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.9.1574      state:D stack:28880 pid:13380 tgid:13377 ppid:12074  task_flags:0x400040 flags:0x00080002
Call Trace:
 <TASK>
 __schedule+0x16e2/0x53f0
 schedule+0x164/0x360
 schedule_preempt_disabled+0x13/0x30
 rwsem_down_read_slowpath+0x61b/0x920
 down_read+0x99/0x2e0
 super_lock+0x2d6/0x3d0
 __iterate_supers+0x120/0x280
 __ia32_sys_sync+0xa0/0x120
 do_syscall_64+0x170/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fc9cf39e019
RSP: 002b:00007fc9d0284028 EFLAGS: 00000246 ORIG_RAX: 00000000000000a2
RAX: ffffffffffffffda RBX: 00007fc9cf626090 RCX: 00007fc9cf39e019
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007fc9cf626090 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fc9cf626128 R14: 00007fc9cf626090 R15: 00007ffed1e08158
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/35:
 #0: ffffffff8e75d000 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
2 locks held by pvrusb2-context/2397:
 #0: ffff8881a5f7c188 (&hdw->big_lock_mutex){+.+.}-{4:4}, at: pvr2_hdw_initialize+0xe4/0x3c60
 #1: ffffffff8e5fa630 (umhelper_sem){++++}-{4:4}, at: usermodehelper_read_trylock+0xfc/0x2c0
2 locks held by getty/5425:
 #0: ffff888113c510a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70
 #1: ffffc9000356e2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x45a/0x13a0
4 locks held by syz-executor/5601:
3 locks held by kworker/1:4/5675:
 #0: ffff88810006b148 ((wq_completion)events){+.+.}-{0:0}, at: process_scheduled_works+0x9bd/0x1470
 #1: ffffc90006a9fc40 ((work_completion)(&data->fib_event_work)){+.+.}-{0:0}, at: process_scheduled_works+0x9bd/0x1470
 #2: ffff88811d112240 (&data->fib_lock){+.+.}-{4:4}, at: nsim_fib_event_work+0x1fd/0x3b0
6 locks held by kworker/1:5/5707:
 #0: ffff8881056bc548 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_scheduled_works+0x9bd/0x1470
 #1: ffffc90006b9fc40 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_scheduled_works+0x9bd/0x1470
 #2: ffff88810bada198 (&dev->mutex){....}-{4:4}, at: hub_event+0x184/0x4d30
 #3: ffff8881a0ed8198 (&dev->mutex){....}-{4:4}, at: usb_disconnect+0xfc/0x9a0
 #4: ffff88816a10b160 (&dev->mutex){....}-{4:4}, at: device_release_driver_internal+0xb9/0x880
 #5: ffff8881a5f7c188 (&hdw->big_lock_mutex){+.+.}-{4:4}, at: pvr2_hdw_disconnect+0x6d/0x4f0
4 locks held by udevd/5881:
 #0: ffff88811d3af0a0 (&p->lock){+.+.}-{4:4}, at: seq_read_iter+0xa4/0xca0
 #1: ffff888118833088 (&of->mutex#2){+.+.}-{4:4}, at: kernfs_seq_start+0x5d/0x420
 #2: ffff8881143331e8 (kn->active#28){++++}-{0:0}, at: kernfs_seq_start+0xb2/0x420
 #3: ffff8881a0ed8198 (&dev->mutex){....}-{4:4}, at: manufacturer_show+0x26/0xa0
3 locks held by kworker/1:8/9068:
 #0: ffff88810006b148 ((wq_completion)events){+.+.}-{0:0}, at: process_scheduled_works+0x9bd/0x1470
 #1: ffffc90005807c40 (free_ipc_work){+.+.}-{0:0}, at: process_scheduled_works+0x9bd/0x1470
 #2: ffffffff8e7632b8 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x38d/0x770
1 lock held by dhcpcd/11778:
 #0: ffff8881a6809a08 (&sb->s_type->i_mutex_key#14){+.+.}-{4:4}, at: sock_close+0x82/0x220
1 lock held by dhcpcd/11916:
 #0: ffff888119af6808 (&sb->s_type->i_mutex_key#14){+.+.}-{4:4}, at: sock_close+0x82/0x220
3 locks held by syz.5.1500/13036:
 #0: ffff8881146b42f8 (&f->f_pos_lock){+.+.}-{4:4}, at: fdget_pos+0x246/0x320
 #1: ffff8881bc53e420 (sb_writers#41){.+.+}-{0:0}, at: vfs_write+0x22b/0xba0
 #2: ffffffff8ea834e8 (nfsd_mutex){+.+.}-{4:4}, at: write_ports+0xb6/0xd70
1 lock held by syz.9.1574/13378:
 #0: ffff888104e8a0e0 (&type->s_umount_key#58){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz.9.1574/13380:
 #0: ffff888104e8a0e0 (&type->s_umount_key#58){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz-executor/16911:
 #0: ffffffff8e7632b8 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x38d/0x770
4 locks held by syz-executor/16961:
 #0: ffff888105718ec0 (&hdev->req_lock){+.+.}-{4:4}, at: hci_unregister_dev+0x212/0x5a0
 #1: ffff8881057180c0 (&hdev->lock){+.+.}-{4:4}, at: hci_dev_close_sync+0x5eb/0x1040
 #2: ffffffff8fd62768 (hci_cb_list_lock){+.+.}-{4:4}, at: hci_conn_hash_flush+0x99/0x260
 #3: ffff88801c297af8 (&conn->lock#2){+.+.}-{4:4}, at: l2cap_conn_del+0x7b/0x5c0
7 locks held by syz-executor/17006:
 #0: ffff888115d28420 (sb_writers#7){.+.+}-{0:0}, at: vfs_write+0x22b/0xba0
 #1: ffff8881a0ee0488 (&of->mutex){+.+.}-{4:4}, at: kernfs_fop_write_iter+0x1d8/0x540
 #2: ffff88816c0ab0f8 (kn->active#48){.+.+}-{0:0}, at: kernfs_fop_write_iter+0x22b/0x540
 #3: ffffffff8f47a1e8 (nsim_bus_dev_list_lock){+.+.}-{4:4}, at: del_device_store+0xd6/0x370
 #4: ffff88810e9200e8 (&dev->mutex){....}-{4:4}, at: device_release_driver_internal+0xb9/0x880
 #5: ffff8881156e4250 (&devlink->lock_key#15){+.+.}-{4:4}, at: nsim_drv_remove+0x50/0x170
 #6: ffffffff8e763180 (rcu_state.barrier_mutex){+.+.}-{4:4}, at: rcu_barrier+0x4c/0x530
1 lock held by dhcpcd-run-hook/17128:

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

NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 35 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+0xf9e/0xff0
 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: 5601 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:__kasan_check_write+0xf/0x20
Code: 66 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 89 f6 48 8b 0c 24 ba 01 00 00 00 <e9> 5c e5 ff ff 66 66 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90
RSP: 0018:ffffc900066af798 EFLAGS: 00000256
RAX: 1ffff1102e06f601 RBX: ffff888104f604d0 RCX: ffffffff8bb0906d
RDX: 0000000000000001 RSI: 0000000000000008 RDI: ffffc900066af7c0
RBP: ffffc900066af830 R08: ffff888104f604d7 R09: 1ffff110209ec09a
R10: dffffc0000000000 R11: ffffed10209ec09b R12: 1ffff92000cd5ef4
R13: ffff888104f60bb0 R14: ffffc900066af7c0 R15: dffffc0000000000
FS:  000055556a68d500(0000) GS:ffff88818de52000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055992f76c950 CR3: 0000000170076000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 down_write+0xcd/0x200
 f2fs_write_checkpoint+0xa81/0x2810
 kill_f2fs_super+0x319/0x720
 deactivate_locked_super+0xbc/0x130
 cleanup_mnt+0x3d3/0x460
 task_work_run+0x1d9/0x270
 exit_to_user_mode_loop+0x18d/0x5e0
 do_syscall_64+0x357/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fa96e39f257
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:00007fff16345ab8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 00007fa96e43445c RCX: 00007fa96e39f257
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007fff16345b70
RBP: 00007fff16345b70 R08: 00007fff16346b70 R09: 00000000ffffffff
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fff16346c00
R13: 00007fa96e43445c R14: 0000000000011685 R15: 00007fff16346c40
 </TASK>
