INFO: task syz.1.5673:20838 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.1.5673      state:D stack:25600 pid:20838 tgid:20838 ppid:5805   task_flags:0x400040 flags:0x00080002
Call Trace:
 <TASK>
 __schedule+0x1585/0x5340
 schedule+0x164/0x360
 schedule_preempt_disabled+0x13/0x30
 __mutex_lock+0x7fe/0x1300
 tun_chr_close+0x3e/0x1c0
 __fput+0x44f/0xa70
 task_work_run+0x1d9/0x270
 exit_to_user_mode_loop+0xed/0x480
 do_syscall_64+0x32d/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f6df8b9cdd9
RSP: 002b:00007ffce87d6938 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: 0000000000000000 RBX: 00007f6df8e17da0 RCX: 00007f6df8b9cdd9
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 00007f6df8e17da0 R08: 0000000000000006 R09: 0000000000000000
R10: 00007f6df8e17cb0 R11: 0000000000000246 R12: 00000000000599d4
R13: 00007f6df8e15fac R14: 000000000005974e R15: 00007f6df8e15fa0
 </TASK>
INFO: task syz.2.5678:20862 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.2.5678      state:D stack:25928 pid:20862 tgid:20861 ppid:5813   task_flags:0x400140 flags:0x00080002
Call Trace:
 <TASK>
 __schedule+0x1585/0x5340
 schedule+0x164/0x360
 schedule_preempt_disabled+0x13/0x30
 __mutex_lock+0x7fe/0x1300
 inet_rtm_newroute+0x12b/0x250
 rtnetlink_rcv_msg+0x7d5/0xbe0
 netlink_rcv_skb+0x232/0x4b0
 netlink_unicast+0x80f/0x9b0
 netlink_sendmsg+0x813/0xb40
 ____sys_sendmsg+0xa68/0xad0
 ___sys_sendmsg+0x2a5/0x360
 __x64_sys_sendmsg+0x1bd/0x2a0
 do_syscall_64+0x14d/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f06e6f9cdd9
RSP: 002b:00007f06e7e61028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f06e7215fa0 RCX: 00007f06e6f9cdd9
RDX: 0000000000000000 RSI: 0000200000000000 RDI: 0000000000000006
RBP: 00007f06e7032d69 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f06e7216038 R14: 00007f06e7215fa0 R15: 00007ffd8c8ae388
 </TASK>
INFO: task syz.2.5678:20866 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.2.5678      state:D stack:27080 pid:20866 tgid:20861 ppid:5813   task_flags:0x400040 flags:0x00080002
Call Trace:
 <TASK>
 __schedule+0x1585/0x5340
 schedule+0x164/0x360
 schedule_preempt_disabled+0x13/0x30
 __mutex_lock+0x7fe/0x1300
 rtnl_dumpit+0x92/0x200
 netlink_dump+0x722/0xe80
 __netlink_dump_start+0x5cb/0x7e0
 rtnetlink_rcv_msg+0xa3a/0xbe0
 netlink_rcv_skb+0x232/0x4b0
 netlink_unicast+0x80f/0x9b0
 netlink_sendmsg+0x813/0xb40
 ____sys_sendmsg+0xa68/0xad0
 ___sys_sendmsg+0x2a5/0x360
 __x64_sys_sendmsg+0x1bd/0x2a0
 do_syscall_64+0x14d/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f06e6f9cdd9
RSP: 002b:00007f06e7e1f028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f06e7216180 RCX: 00007f06e6f9cdd9
RDX: 0000000004041080 RSI: 0000200000006040 RDI: 0000000000000007
RBP: 00007f06e7032d69 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f06e7216218 R14: 00007f06e7216180 R15: 00007ffd8c8ae388
 </TASK>

Showing all locks held in the system:
2 locks held by kworker/1:0/24:
8 locks held by kworker/1:2/32:
1 lock held by khungtaskd/35:
 #0: ffffffff8e760320 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
1 lock held by dhcpcd/5551:
 #0: ffffffff8fbcc388 (rtnl_mutex){+.+.}-{4:4}, at: inet6_rtm_newaddr+0x65f/0xe30
2 locks held by getty/5631:
 #0: ffff8881110cc0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70
 #1: ffffc9000356e2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x45c/0x13c0
3 locks held by kworker/u8:2/5635:
 #0: ffff8881108a3148 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_scheduled_works+0x9ea/0x1830
 #1: ffffc90005aafc40 ((work_completion)(&(&net->ipv6.addr_chk_work)->work)){+.+.}-{0:0}, at: process_scheduled_works+0xa25/0x1830
 #2: ffffffff8fbcc388 (rtnl_mutex){+.+.}-{4:4}, at: addrconf_verify_work+0x19/0x30
1 lock held by syz.1.5673/20838:
 #0: ffffffff8fbcc388 (rtnl_mutex){+.+.}-{4:4}, at: tun_chr_close+0x3e/0x1c0
2 locks held by syz.0.5677/20856:
 #0: ffffffff8fbcc388 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_newlink+0x8a1/0x1be0
 #1: ffffffff8fc6d6a8 (flowtable_lock){+.+.}-{4:4}, at: nf_flow_table_cleanup+0x21/0xb0
1 lock held by syz.2.5678/20862:
 #0: ffffffff8fbcc388 (rtnl_mutex){+.+.}-{4:4}, at: inet_rtm_newroute+0x12b/0x250
2 locks held by syz.2.5678/20866:
 #0: ffff8881144236f0 (nlk_cb_mutex-ROUTE){+.+.}-{4:4}, at: __netlink_dump_start+0xfe/0x7e0
 #1: ffffffff8fbcc388 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_dumpit+0x92/0x200
1 lock held by syz-executor/20869:
 #0: ffffffff8fbcc388 (rtnl_mutex){+.+.}-{4:4}, at: inet_rtm_newaddr+0x404/0x1ad0
1 lock held by syz-executor/20876:
 #0: ffffffff8fbcc388 (rtnl_mutex){+.+.}-{4:4}, at: inet_rtm_newaddr+0x404/0x1ad0
1 lock held by syz-executor/20879:
 #0: ffffffff8fbcc388 (rtnl_mutex){+.+.}-{4:4}, at: inet_rtm_newaddr+0x404/0x1ad0
1 lock held by syz-executor/20882:
 #0: ffffffff8fbcc388 (rtnl_mutex){+.+.}-{4:4}, at: inet_rtm_newaddr+0x404/0x1ad0
1 lock held by syz-executor/20888:
 #0: ffffffff8fbcc388 (rtnl_mutex){+.+.}-{4:4}, at: inet_rtm_newaddr+0x404/0x1ad0
1 lock held by syz-executor/20890:
 #0: ffffffff8fbcc388 (rtnl_mutex){+.+.}-{4:4}, at: inet_rtm_newaddr+0x404/0x1ad0
1 lock held by syz-executor/20893:
 #0: ffffffff8fbcc388 (rtnl_mutex){+.+.}-{4:4}, at: inet_rtm_newaddr+0x404/0x1ad0
1 lock held by syz-executor/20899:
 #0: ffffffff8fbcc388 (rtnl_mutex){+.+.}-{4:4}, at: inet_rtm_newaddr+0x404/0x1ad0
1 lock held by syz-executor/20902:
 #0: ffffffff8fbcc388 (rtnl_mutex){+.+.}-{4:4}, at: inet_rtm_newaddr+0x404/0x1ad0

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

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+0x17a/0x300
 sys_info+0x135/0x170
 watchdog+0xfd9/0x1030
 kthread+0x388/0x470
 ret_from_fork+0x51e/0xb90
 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: 32 Comm: kworker/1:2 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
Workqueue: events send_dm_alert
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 56 48 76 03 66 0f 1f 44 00
RSP: 0018:ffffc90000a07e40 EFLAGS: 00000046
RAX: 00000000000004ff RBX: ffff88823c623e40 RCX: 0000000000000838
RDX: 0000000000000000 RSI: 00000000000004ff RDI: 0000000000000838
RBP: 0000000000000000 R08: ffffffff81b2bde5 R09: ffffffff9a2b3508
R10: 0000000000000003 R11: ffffffff8173c750 R12: 0000000010005087
R13: dffffc0000000000 R14: 00000000000004ff R15: 0000000000000020
FS:  0000000000000000(0000) GS:ffff8882a9467000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f6df99456b8 CR3: 000000000e54c000 CR4: 00000000000006f0
Call Trace:
 <IRQ>
 lapic_next_event+0x11/0x20
 clockevents_program_event+0x1c9/0x350
 hrtimer_interrupt+0xb08/0x1010
 __sysvec_apic_timer_interrupt+0x102/0x460
 sysvec_apic_timer_interrupt+0x52/0xc0
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:_raw_spin_unlock_irqrestore+0x47/0x80
Code: f7 e8 1d 62 f2 f5 f7 c3 00 02 00 00 74 05 e8 40 b1 1d f6 9c 58 a9 00 02 00 00 75 27 f7 c3 00 02 00 00 74 01 fb bf 01 00 00 00 <e8> 64 28 e4 f5 65 8b 05 8d cf 6b 07 85 c0 74 18 5b 41 5e c3 cc cc
RSP: 0018:ffffc90000a080b8 EFLAGS: 00000206
RAX: 0000000000000006 RBX: 0000000000000202 RCX: 0000000000000102
RDX: 0000000000000003 RSI: ffffffff8def236f RDI: 0000000000000001
RBP: ffffc90000a08170 R08: ffffffff90117eb7 R09: 1ffffffff2022fd6
R10: dffffc0000000000 R11: fffffbfff2022fd7 R12: ffff8881956bad80
R13: ffffea000655ae90 R14: ffff888160416b40 R15: 0000000000000202
 get_from_partial_node+0x47a/0x500
 ___slab_alloc+0xae/0x6b0
 kmem_cache_alloc_node_noprof+0x1f6/0x690
 __alloc_skb+0x1d0/0x7d0
 synproxy_send_client_synack+0x172/0xe30
 nft_synproxy_eval_v4+0x34a/0x4e0
 nft_synproxy_do_eval+0x305/0x580
 nft_do_chain+0x45e/0x1990
 nft_do_chain_inet+0x29d/0x380
 nf_hook_slow+0xc5/0x220
 NF_HOOK+0x21f/0x3c0
 NF_HOOK+0x336/0x3c0
 process_backlog+0xaa3/0x1950
 __napi_poll+0xae/0x340
 net_rx_action+0x627/0xf70
 handle_softirqs+0x22a/0x870
 __irq_exit_rcu+0x5f/0x150
 irq_exit_rcu+0x9/0x30
 sysvec_apic_timer_interrupt+0xa6/0xc0
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:__schedule+0x158d/0x5340
Code: d8 48 c1 e8 03 42 80 3c 30 00 74 08 48 89 df e8 b9 a2 81 f6 4c 89 2b 4c 89 e7 4c 89 ee e8 3b 42 85 f5 48 89 c7 e8 43 e0 e6 f5 <31> ff 4d 39 ec 40 0f 95 c7 e8 65 e9 e6 f5 48 8b 84 24 d8 00 00 00
RSP: 0018:ffffc90000a875a0 EFLAGS: 00000206
RAX: 000000000053ff35 RBX: ffff88823c63adc8 RCX: 0000000080000001
RDX: 0000000000000007 RSI: ffffffff8def236f RDI: ffffffff8c27a880
RBP: ffffc90000a87790 R08: ffffffff90117eb7 R09: 1ffffffff2022fd6
R10: dffffc0000000000 R11: fffffbfff2022fd7 R12: ffff888161a85700
R13: ffff888161a85700 R14: dffffc0000000000 R15: 1ffff110478c75b3
 preempt_schedule_irq+0x4d/0xa0
 irqentry_exit+0x599/0x620
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:__slab_free+0x105/0x2b0
Code: fa 41 f7 c5 00 02 00 00 75 42 4c 89 f7 48 8d 74 24 40 48 8d 54 24 30 e8 79 7a 00 00 89 c3 eb 4a 48 8b 5c 24 30 48 8b 4c 24 38 <48> 8b 44 24 40 48 8b 54 24 48 f0 49 0f c7 4e 20 0f 84 86 00 00 00
RSP: 0018:ffffc90000a878c0 EFLAGS: 00000202
RAX: 000000000000000e RBX: ffff888021399200 RCX: 000000000015000e
RDX: ffff888021399200 RSI: ffff888021399200 RDI: 0000000000000000
RBP: ffffc90000a87948 R08: 0000000000000001 R09: ffffffff822fc49c
R10: dffffc0000000000 R11: fffffbfff2022fd7 R12: 0000000000000000
R13: ffff888160419dc0 R14: ffffea000084e600 R15: ffff888021399080
 qlist_free_all+0x97/0x100
 kasan_quarantine_reduce+0x148/0x160
 __kasan_slab_alloc+0x22/0x80
 kmem_cache_alloc_node_noprof+0x384/0x690
 __alloc_skb+0x1d0/0x7d0
 reset_per_cpu_data+0x31/0x1e0
 send_dm_alert+0x1f/0xf0
 process_scheduled_works+0xb02/0x1830
 worker_thread+0xa50/0xfc0
 kthread+0x388/0x470
 ret_from_fork+0x51e/0xb90
 ret_from_fork_asm+0x1a/0x30
 </TASK>
