INFO: task syz.2.859:9303 blocked for more than 143 seconds.
      Not tainted syzkaller #0
      Blocked by coredump.
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.2.859       state:D stack:22760 pid:9303  tgid:9302  ppid:8680   task_flags:0x40054c flags:0x00004000
Call Trace:
 <TASK>
 __schedule+0x1798/0x4cc0
 schedule+0x165/0x360
 schedule_preempt_disabled+0x13/0x30
 rwsem_down_write_slowpath+0x872/0xfe0
 down_write+0x1ab/0x1f0
 exit_mmap+0x28e/0xb50
 __mmput+0x118/0x420
 exit_mm+0x1da/0x2c0
 do_exit+0x648/0x2300
 do_group_exit+0x21c/0x2d0
 get_signal+0x1286/0x1340
 arch_do_signal_or_restart+0x9a/0x750
 exit_to_user_mode_loop+0x75/0x110
 do_syscall_64+0x2bd/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f4ada58ebe9
RSP: 002b:00007f4adb4a00e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 00007f4ada7c5fa8 RCX: 00007f4ada58ebe9
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f4ada7c5fa8
RBP: 00007f4ada7c5fa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f4ada7c6038 R14: 00007ffd660d5e60 R15: 00007ffd660d5f48
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/34:
 #0: ffffffff8e139ea0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
2 locks held by kworker/u10:6/1094:
 #0: ffff88801a489148 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_scheduled_works+0x9b4/0x17b0
 #1: ffffc90006b07bc0 ((work_completion)(&(&kfence_timer)->work)){+.+.}-{0:0}, at: process_scheduled_works+0x9ef/0x17b0
2 locks held by getty/5676:
 #0: ffff88802530d0a0 (&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/5774:
 #0: ffff88810d9857e0 (&mm->mmap_lock){++++}-{4:4}, at: vm_mmap_pgoff+0x211/0x4d0
5 locks held by kworker/1:7/7463:
 #0: ffff888136639f98 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x2a/0x140
 #1: ffff888136624008 (psi_seq){-.-.}-{0:0}, at: psi_task_switch+0x53/0x880
 #2: ffff88803ce50fe0 (&r->consumer_lock#2){+.+.}-{3:3}, at: wg_packet_decrypt_worker+0x87a/0xd10
 #3: ffffffff8e139ea0 (rcu_read_lock){....}-{1:3}, at: select_task_rq_fair+0x309/0x3570
 #4: ffffffff8e139f00 (rcu_read_lock_bh){....}-{1:3}, at: wg_packet_receive+0x11e9/0x25b0
1 lock held by syz.2.859/9303:
 #0: ffff888029b64260 (&mm->mmap_lock){++++}-{4:4}, at: exit_mmap+0x28e/0xb50
2 locks held by syz-executor/9494:
 #0: ffffffff8e1f1010 (dup_mmap_sem){++++}-{0:0}, at: copy_mm+0x131/0x4b0
 #1: ffff88801a478ca0 (&mm->mmap_lock){++++}-{4:4}, at: dup_mmap+0x12e/0x1ac0
1 lock held by syz-executor/9504:
 #0: ffff888029b62220 (&mm->mmap_lock){++++}-{4:4}, at: exit_mmap+0x28e/0xb50
1 lock held by syz.0.935/9633:
 #0: ffff888029b657e0 (&mm->mmap_lock){++++}-{4:4}, at: exit_mmap+0x28e/0xb50
1 lock held by syz.4.949/9676:
 #0: ffff888028d9d7e0 (&mm->mmap_lock){++++}-{4:4}, at: exit_mmap+0x28e/0xb50
1 lock held by syz.5.950/9683:
 #0: ffff8881095837a0 (&mm->mmap_lock){++++}-{4:4}, at: exit_mmap+0x28e/0xb50

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

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+0x3fc/0x770
 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: 0 Comm: swapper/1 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:pv_native_safe_halt+0x13/0x20
Code: 13 e8 02 00 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 d3 f6 0e 00 f3 0f 1e fa fb f4 <c3> cc cc cc cc cc cc cc cc cc cc cc cc 90 90 90 90 90 90 90 90 90
RSP: 0018:ffffc90000177de0 EFLAGS: 00000282
RAX: 16305fd1d14b3c00 RBX: ffffffff819683a8 RCX: 16305fd1d14b3c00
RDX: 0000000000000001 RSI: ffffffff8d9b6a5f RDI: ffffffff8be33300
RBP: ffffc90000177f20 R08: ffff888136632f9b R09: 1ffff11026cc65f3
R10: dffffc0000000000 R11: ffffed1026cc65f4 R12: ffffffff8fa38030
R13: 0000000000000001 R14: 0000000000000001 R15: 1ffff11020006000
FS:  0000000000000000(0000) GS:ffff8881a3c1c000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000561d0a8c34b4 CR3: 000000000df36000 CR4: 00000000000006f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000200000000300 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <TASK>
 default_idle+0x13/0x20
 default_idle_call+0x74/0xb0
 do_idle+0x1e8/0x510
 cpu_startup_entry+0x44/0x60
 start_secondary+0x101/0x110
 common_startup_64+0x13e/0x147
 </TASK>
