INFO: task syz.2.35:5803 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.2.35        state:D stack:24360 pid:5803  tgid:5803  ppid:5596   task_flags:0x400040 flags:0x00080002
Call Trace:
 <TASK>
 __schedule+0x17db/0x58f0
 schedule+0x164/0x2b0
 schedule_preempt_disabled+0x13/0x30
 __mutex_lock+0x7c1/0x1550
 tun_chr_close+0x3e/0x1c0
 __fput+0x418/0xa50
 task_work_run+0x1d9/0x270
 exit_to_user_mode_loop+0x204/0x770
 do_syscall_64+0x328/0x520
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f5a7839e159
RSP: 002b:00007ffdb58855e8 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: 0000000000000000 RBX: 00007f5a78627da0 RCX: 00007f5a7839e159
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 00007f5a78627da0 R08: 0000000000000006 R09: 0000000000000000
R10: 00007f5a78627cb0 R11: 0000000000000246 R12: 000000000000db16
R13: 00007f5a7862645c R14: 000000000000dacb R15: 00007f5a78626450
 </TASK>

Showing all locks held in the system:
locks held by khungtaskd/35: 1, last CPU#0:
 #0: ffffffff8ed5c7e0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
locks held by kworker/1:2/988: 3, on CPU#1:
 #0: ffff88810006b140 ((wq_completion)events){+.+.}-{0:0}, at: process_scheduled_works+0x97a/0x1630
 #1: ffffc900070cfc40 ((work_completion)(&fw_work->work)){+.+.}-{0:0}, at: process_scheduled_works+0x97a/0x1630
 #2: ffffffff90251c80 (rtnl_mutex){+.+.}-{4:4}, at: regdb_fw_cb+0x7d/0x1c0
locks held by getty/5422: 2, on CPU#1:
 #0: ffff88817354d0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70
 #1: ffffc900034832e8 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x45a/0x1360
locks held by syz-executor/5601: 1, on CPU#0:
 #0: ffffffff90251c80 (rtnl_mutex){+.+.}-{4:4}, at: tun_chr_close+0x3e/0x1c0
locks held by kworker/u8:2/5630: 3, on CPU#0:
 #0: ffff88816fe79140 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_scheduled_works+0x97a/0x1630
 #1: ffffc90004f0fc40 ((work_completion)(&(&net->ipv6.addr_chk_work)->work)){+.+.}-{0:0}, at: process_scheduled_works+0x97a/0x1630
 #2: ffffffff90251c80 (rtnl_mutex){+.+.}-{4:4}, at: addrconf_verify_work+0x19/0x30
locks held by kworker/1:6/5781: 3, on CPU#1:
 #0: ffff888100069d40 ((wq_completion)events_power_efficient){+.+.}-{0:0}, at: process_scheduled_works+0x97a/0x1630
 #1: ffffc90005977c40 ((reg_check_chans).work){+.+.}-{0:0}, at: process_scheduled_works+0x97a/0x1630
 #2: ffffffff90251c80 (rtnl_mutex){+.+.}-{4:4}, at: reg_check_chans_work+0xac/0x1110
locks held by syz.1.34/5809: 1, on CPU#0:
 #0: ffffffff90251c80 (rtnl_mutex){+.+.}-{4:4}, at: tun_chr_close+0x3e/0x1c0
locks held by syz.2.35/5803: 1, on CPU#0:
 #0: ffffffff90251c80 (rtnl_mutex){+.+.}-{4:4}, at: tun_chr_close+0x3e/0x1c0
locks held by syz.2.35/5808: 3, last CPU#1:
 #0: ffffffff90251c80 (rtnl_mutex){+.+.}-{4:4}, at: dev_ioctl+0x7a4/0x1150
 #1: ffffffff8eeac8f0 (remove_cache_srcu){.+.+}-{0:0}, at: srcu_read_lock+0x27/0x60
 #2: ffffffff8ed5c900 (rcu_callback){....}-{0:0}, at: rcu_core+0x8a8/0x1260
locks held by syz-executor/5819: 1, on CPU#1:
 #0: ffffffff90251c80 (rtnl_mutex){+.+.}-{4:4}, at: inet_rtm_newaddr+0x470/0x19f0
locks held by syz-executor/5828: 1, on CPU#1:
 #0: ffffffff90251c80 (rtnl_mutex){+.+.}-{4:4}, at: inet_rtm_newaddr+0x470/0x19f0
locks held by syz-executor/5832: 1, on CPU#1:
 #0: ffffffff90251c80 (rtnl_mutex){+.+.}-{4:4}, at: inet_rtm_newaddr+0x470/0x19f0
locks held by syz-executor/5845: 1, on CPU#1:
 #0: ffffffff90251c80 (rtnl_mutex){+.+.}-{4:4}, at: inet_rtm_newaddr+0x470/0x19f0
locks held by syz-executor/5854: 1, on CPU#1:
 #0: ffffffff90251c80 (rtnl_mutex){+.+.}-{4:4}, at: inet_rtm_newaddr+0x470/0x19f0
locks held by syz-executor/5856: 1, on CPU#1:
 #0: ffffffff90251c80 (rtnl_mutex){+.+.}-{4:4}, at: inet_rtm_newaddr+0x470/0x19f0
locks held by syz-executor/5864: 1, on CPU#1:
 #0: ffffffff90251c80 (rtnl_mutex){+.+.}-{4:4}, at: inet_rtm_newaddr+0x470/0x19f0
locks held by syz-executor/5872: 1, on CPU#1:
 #0: ffffffff90251c80 (rtnl_mutex){+.+.}-{4:4}, at: inet_rtm_newaddr+0x470/0x19f0
locks held by syz-executor/5875: 1, on CPU#1:
 #0: ffffffff90251c80 (rtnl_mutex){+.+.}-{4:4}, at: inet_rtm_newaddr+0x470/0x19f0

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

NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 35 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+0xe8/0x150
 nmi_cpu_backtrace+0x274/0x2d0
 nmi_trigger_cpumask_backtrace+0x17d/0x390
 sys_info+0x135/0x170
 watchdog+0xfd7/0x1030
 kthread+0x38b/0x480
 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: 5808 Comm: syz.2.35 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:native_apic_msr_write+0x39/0x50
Code: 74 2a 83 ff 30 74 25 eb 10 81 ff d0 00 00 00 74 1b 81 ff e0 00 00 00 74 13 c1 ef 04 81 c7 00 08 00 00 89 f9 89 f0 31 d2 0f 30 <66> 90 c3 cc cc cc cc cc 89 f6 31 d2 e9 26 6d a6 03 66 0f 1f 44 00
RSP: 0018:ffffc90000a186d0 EFLAGS: 00000046
RAX: 000000000000013b RBX: ffff88823c623c80 RCX: 0000000000000838
RDX: 0000000000000000 RSI: 000000000000013b RDI: 0000000000000838
RBP: ffffc90000a187a0 R08: 0000000000000100 R09: 0000000000000001
R10: 0000000000000003 R11: ffffffff81754510 R12: 000000000000013b
R13: dffffc0000000000 R14: 0000000010000863 R15: 0000000000000020
FS:  00007f5a791be6c0(0000) GS:ffff8882a8cd5000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f1162b1e866 CR3: 00000001736dc000 CR4: 00000000000006f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 lapic_next_event+0x11/0x20
 clockevents_program_event+0x385/0x630
 __hrtimer_rearm_deferred+0x36c/0x4b0
 irqentry_exit+0x8d3/0x910
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:__kernel_text_address+0x23/0x30
Code: 90 90 90 90 90 90 90 0f 1f 40 d6 53 48 89 fb e8 33 00 00 00 48 81 fb 00 f0 ed 91 0f 93 c1 48 81 fb 80 3d 06 92 0f 92 c2 20 ca <08> c2 0f b6 c2 5b e9 02 1c 57 0a cc 90 90 90 90 90 90 90 90 90 90
RSP: 0018:ffffc90000a188f8 EFLAGS: 00000246
RAX: 0000000000000001 RBX: ffffffff89b30519 RCX: 0000000000000100
RDX: ffffc90000a18900 RSI: ffffffff8e6fea61 RDI: ffffffff89b30519
RBP: ffffc90000a189b0 R08: ffffc90005a97af0 R09: 0000000000000000
R10: ffffc90000a18978 R11: fffff52000143131 R12: ffff88816ed45a00
R13: ffff88810aad3e20 R14: dffffc0000000000 R15: 1ffff9200014312e
 unwind_get_return_address+0x4d/0x90
 arch_stack_walk+0xfb/0x150
 stack_trace_save+0xa9/0x100
 kasan_save_track+0x3e/0x80
 kasan_save_free_info+0x40/0x50
 __kasan_slab_free+0x5c/0x80
 __rcu_free_sheaf_prepare+0x12d/0x2a0
 rcu_free_sheaf+0x31/0x200
 rcu_core+0x926/0x1260
 handle_softirqs+0x226/0x860
 __irq_exit_rcu+0xcb/0x220
 irq_exit_rcu+0x9/0x30
 sysvec_apic_timer_interrupt+0xa6/0xc0
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:preempt_schedule_irq+0x46/0x90
Code: 49 be 00 00 00 00 00 fc ff df eb 09 48 f7 03 10 00 00 00 74 53 bf 01 00 00 00 e8 55 c1 ae f5 e8 60 f6 e9 f5 fb bf 01 00 00 00 <e8> 65 a1 ff ff 9c 58 fa a9 00 02 00 00 74 05 e8 26 f8 e9 f5 bf 01
RSP: 0018:ffffc90005a96ea8 EFLAGS: 00000202
RAX: 000000000063bdcd RBX: 0000000000000000 RCX: 0000000000000001
RDX: 0000000000000007 RSI: ffffffff8e476039 RDI: 0000000000000001
RBP: 0000000000000000 R08: ffffffff907a257f R09: 1ffffffff20f44af
R10: dffffc0000000000 R11: fffffbfff20f44b0 R12: 0000000000000000
R13: 0000000000000000 R14: dffffc0000000000 R15: 0000000000000000
 irqentry_exit+0x14f/0x910
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:__kasan_check_byte+0x0/0x40
Code: e8 75 2f 00 00 48 89 df 4c 89 f6 5b 41 5c 41 5e 41 5f e9 43 fa ff ff 0f 1f 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 <0f> 1f 40 d6 41 56 53 48 89 f3 49 89 fe e8 3e 15 00 00 84 c0 75 16
RSP: 0018:ffffc90005a96fc0 EFLAGS: 00000202
RAX: 0000000000000001 RBX: 0000000000000000 RCX: 8000000000000001
RDX: 0000000000000000 RSI: ffffffff8177f1fc RDI: ffffffff8ed5c7e0
RBP: 1ffff92000b52e28 R08: 0000000000000000 R09: 0000000000000000
R10: ffffc90005a97158 R11: ffffffff81b29190 R12: ffffffff8ed5c7e0
R13: 0000000000000002 R14: 0000000000000000 R15: 0000000000000000
 lock_acquire+0x7d/0x350
 unwind_next_frame+0xac/0x2550
 arch_stack_walk+0x11b/0x150
 stack_trace_save+0xa9/0x100
 save_stack+0x122/0x230
 __reset_page_owner+0x71/0x1f0
 __free_frozen_pages+0xc93/0xd90
 __slab_free+0x274/0x2c0
 qlist_free_all+0x99/0x100
 kasan_quarantine_reduce+0x148/0x160
 __kasan_slab_alloc+0x22/0x80
 __kmalloc_cache_noprof+0x29f/0x600
 ref_tracker_alloc+0x15b/0x4b0
 qdisc_alloc+0x6cf/0x9d0
 qdisc_create_dflt+0x8e/0x4e0
 mq_init_common+0x267/0x440
 mq_init+0x83/0x260
 qdisc_create_dflt+0x13b/0x4e0
 dev_activate+0x1ce/0x1150
 __dev_open+0x699/0x850
 __dev_change_flags+0x329/0x820
 netif_change_flags+0x7c/0x1b0
 dev_change_flags+0x128/0x260
 dev_ioctl+0x7b4/0x1150
 sock_do_ioctl+0x23e/0x320
 sock_ioctl+0x57a/0x7e0
 __se_sys_ioctl+0xfc/0x170
 do_syscall_64+0x166/0x520
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f5a7839e159
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f5a791be028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f5a78626090 RCX: 00007f5a7839e159
RDX: 0000200000000080 RSI: 0000000000008914 RDI: 0000000000000005
RBP: 00007f5a78435024 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f5a78626128 R14: 00007f5a78626090 R15: 00007ffdb5885488
 </TASK>
