INFO: task syz-executor:7397 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor    state:D stack:18856 pid:7397  tgid:7397  ppid:1      task_flags:0x400140 flags:0x00004004
Call Trace:
 <TASK>
 __schedule+0x1798/0x4cc0
 schedule+0x165/0x360
 io_schedule+0x80/0xd0
 folio_wait_bit_common+0x6b0/0xb90
 __filemap_get_folio+0x139/0xaf0
 truncate_inode_pages_range+0x3ed/0xda0
 evict+0x517/0x9c0
 evict_inodes+0x64c/0x6d0
 generic_shutdown_super+0x9a/0x2c0
 kill_block_super+0x44/0x90
 deactivate_locked_super+0xbc/0x130
 cleanup_mnt+0x425/0x4c0
 task_work_run+0x1d4/0x260
 exit_to_user_mode_loop+0xec/0x110
 do_syscall_64+0x2bd/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f821af8ff57
RSP: 002b:00007ffd6e1ec5b8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 00007f821b011c2d RCX: 00007f821af8ff57
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffd6e1ec670
RBP: 00007ffd6e1ec670 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000ffffffff R11: 0000000000000246 R12: 00007ffd6e1ed700
R13: 00007f821b011c2d R14: 000000000002c59b R15: 00007ffd6e1ed740
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/34:
 #0: ffffffff8e13a0e0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
3 locks held by kworker/0:2/96:
 #0: ffff88801a480d48 ((wq_completion)events){+.+.}-{0:0}, at: process_scheduled_works+0x9b4/0x17b0
 #1: ffffc90001bffbc0 ((work_completion)(&data->fib_event_work)){+.+.}-{0:0}, at: process_scheduled_works+0x9ef/0x17b0
 #2: ffff8880395d6240 (&data->fib_lock){+.+.}-{4:4}, at: nsim_fib_event_work+0x26b/0x3180
3 locks held by kworker/1:2/973:
 #0: ffff88801a480d48 ((wq_completion)events){+.+.}-{0:0}, at: process_scheduled_works+0x9b4/0x17b0
 #1: ffffc90006857bc0 (deferred_process_work){+.+.}-{0:0}, at: process_scheduled_works+0x9ef/0x17b0
 #2: ffffffff8f53a1c8 (rtnl_mutex){+.+.}-{4:4}, at: switchdev_deferred_process_work+0xe/0x20
2 locks held by dhcpcd/5596:
 #0: ffff888038e776d8 (nlk_cb_mutex-ROUTE){+.+.}-{4:4}, at: netlink_dump+0xbd/0xe90
 #1: ffffffff8f53a1c8 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_dumpit+0x92/0x200
2 locks held by getty/5683:
 #0: ffff8880273850a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70
 #1: ffffc900029062f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x43e/0x1400
1 lock held by syz-executor/7397:
 #0: ffff8881058c80e0 (&type->s_umount_key#94){+.+.}-{4:4}, at: deactivate_super+0xa9/0xe0
4 locks held by kworker/u8:5/11183:
 #0: ffff88801b2f7148 ((wq_completion)netns){+.+.}-{0:0}, at: process_scheduled_works+0x9b4/0x17b0
 #1: ffffc900035efbc0 (net_cleanup_work){+.+.}-{0:0}, at: process_scheduled_works+0x9ef/0x17b0
 #2: ffffffff8f52d310 (pernet_ops_rwsem){++++}-{4:4}, at: cleanup_net+0xf7/0x800
 #3: ffffffff8f53a1c8 (rtnl_mutex){+.+.}-{4:4}, at: ops_undo_list+0x2a4/0x990
1 lock held by syz.4.1464/12025:
1 lock held by syz-executor/12973:
 #0: ffffffff8f53a1c8 (rtnl_mutex){+.+.}-{4:4}, at: __tun_chr_ioctl+0x37a/0x1df0
1 lock held by syz.8.1663/12987:
 #0: ffff888124e940e0 (&type->s_umount_key#78){+.+.}-{4:4}, at: deactivate_super+0xa9/0xe0

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

NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 34 Comm: khungtaskd Not tainted syzkaller #0 PREEMPT(full) 
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+0x189/0x250
 nmi_cpu_backtrace+0x39e/0x3d0
 nmi_trigger_cpumask_backtrace+0x17a/0x300
 watchdog+0xf93/0xfe0
 kthread+0x711/0x8a0
 ret_from_fork+0x439/0x7d0
 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: 12987 Comm: syz.8.1663 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
RIP: 0010:kasan_byte_accessible+0x16/0x30
Code: 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 66 0f 1f 00 48 c1 ef 03 48 b8 00 00 00 00 00 fc ff df 0f b6 04 07 <3c> 08 0f 92 c0 e9 c0 26 5a 09 cc 66 66 66 66 66 66 2e 0f 1f 84 00
RSP: 0018:ffffc90004d4f740 EFLAGS: 00000802
RAX: 0000000000000000 RBX: ffffffff8b7cebf7 RCX: ac87dcf913c19d00
RDX: 0000000000000000 RSI: ffffffff8b7cebf7 RDI: 1ffffffff33a5f80
RBP: ffffffff84d0ca8a R08: 0000000000000001 R09: 0000000000000000
R10: dffffc0000000000 R11: fffffbfff1f474e7 R12: 0000000000000000
R13: ffffffff99d2fc00 R14: ffffffff99d2fc00 R15: 0000000000000001
FS:  00007ff2e92f36c0(0000) GS:ffff8881a3c13000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005634c8ca8e68 CR3: 000000010a298000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 __kasan_check_byte+0x12/0x40
 lock_acquire+0x8d/0x360
 _raw_spin_lock_irqsave+0xa7/0xf0
 debug_check_no_obj_freed+0x17a/0x470
 remove_vm_area+0x1d3/0x300
 vfree+0x63/0x400
 kcov_close+0x28/0x50
 __fput+0x44c/0xa70
 task_work_run+0x1d4/0x260
 do_exit+0x6b5/0x2300
 do_group_exit+0x21c/0x2d0
 get_signal+0x1286/0x1340
 arch_do_signal_or_restart+0x9a/0x750
 irqentry_exit_to_user_mode+0x81/0x120
 asm_sysvec_call_function_single+0x1a/0x20
RIP: 0033:0x7ff2e8250cb8
Code: Unable to access opcode bytes at 0x7ff2e8250c8e.
RSP: 002b:00007ff2e92f23f0 EFLAGS: 00000246
RAX: 00000000001dc595 RBX: 00007ff2e92f2490 RCX: 00000000000000e2
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 00007ff2e92f2530
RBP: 0000000000000102 R08: 00007ff2de000000 R09: 0000000000000000
R10: 0000000000000000 R11: 00007ff2e92f24a0 R12: 0000000000000001
R13: 00007ff2e842da20 R14: 0000000000000000 R15: 00007ff2e92f2530
 </TASK>
