INFO: task dhcpcd:5592 blocked for more than 144 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:dhcpcd          state:D stack:21352 pid:5592  tgid:5592  ppid:5591   task_flags:0x400140 flags:0x00004002
Call Trace:
 <TASK>
 __schedule+0x1798/0x4cc0
 schedule+0x165/0x360
 schedule_preempt_disabled+0x13/0x30
 __mutex_lock+0x7e6/0x1360
 inet6_rtm_newaddr+0x5b7/0xd20
 rtnetlink_rcv_msg+0x7cf/0xb70
 netlink_rcv_skb+0x208/0x470
 netlink_unicast+0x82f/0x9e0
 netlink_sendmsg+0x805/0xb30
 __sock_sendmsg+0x21c/0x270
 ____sys_sendmsg+0x505/0x830
 ___sys_sendmsg+0x21f/0x2a0
 __x64_sys_sendmsg+0x19b/0x260
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7eff53c17a4b
RSP: 002b:00007fffee549378 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007eff53b3f6c0 RCX: 00007eff53c17a4b
RDX: 0000000000000000 RSI: 00007fffee55d528 RDI: 0000000000000018
RBP: 0000000000000018 R08: 0000000000000000 R09: 00007fffee55d528
R10: 0000000000000000 R11: 0000000000000246 R12: ffffffffffffffff
R13: 00007fffee55d528 R14: 0000000000000048 R15: 0000000000000001
 </TASK>
INFO: task syz.2.2016:12997 blocked for more than 144 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.2.2016      state:D stack:28328 pid:12997 tgid:12995 ppid:12438  task_flags:0x400040 flags:0x00004004
Call Trace:
 <TASK>
 __schedule+0x1798/0x4cc0
 schedule+0x165/0x360
 schedule_preempt_disabled+0x13/0x30
 __mutex_lock+0x7e6/0x1360
 __tun_chr_ioctl+0x37a/0x1df0
 __se_sys_ioctl+0xfc/0x170
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fee73b8ebe9
RSP: 002b:00007fee74963038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fee73db6090 RCX: 00007fee73b8ebe9
RDX: 00002000000002c0 RSI: 00000000400454ca RDI: 0000000000000005
RBP: 00007fee73c11e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fee73db6128 R14: 00007fee73db6090 R15: 00007ffee8a273a8
 </TASK>
INFO: task syz.2.2016:12998 blocked for more than 144 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.2.2016      state:D stack:25896 pid:12998 tgid:12995 ppid:12438  task_flags:0x400140 flags:0x00004006
Call Trace:
 <TASK>
 __schedule+0x1798/0x4cc0
 schedule+0x165/0x360
 schedule_preempt_disabled+0x13/0x30
 __mutex_lock+0x7e6/0x1360
 __tun_chr_ioctl+0x37a/0x1df0
 __se_sys_ioctl+0xfc/0x170
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fee73b8ebe9
RSP: 002b:00007fee74942038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fee73db6180 RCX: 00007fee73b8ebe9
RDX: 0000200000000180 RSI: 00000000400454ca RDI: 0000000000000008
RBP: 00007fee73c11e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fee73db6218 R14: 00007fee73db6180 R15: 00007ffee8a273a8
 </TASK>
INFO: task syz.1.2021:13018 blocked for more than 144 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.1.2021      state:D stack:26416 pid:13018 tgid:13016 ppid:5844   task_flags:0x400140 flags:0x00004004
Call Trace:
 <TASK>
 __schedule+0x1798/0x4cc0
 schedule+0x165/0x360
 schedule_preempt_disabled+0x13/0x30
 __mutex_lock+0x7e6/0x1360
 dev_ioctl+0x83c/0x1150
 sock_ioctl+0x719/0x790
 __se_sys_ioctl+0xfc/0x170
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f868998ebe9
RSP: 002b:00007f868a772038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f8689bb6090 RCX: 00007f868998ebe9
RDX: 0000200000000080 RSI: 00000000000089f1 RDI: 0000000000000009
RBP: 00007f8689a11e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f8689bb6128 R14: 00007f8689bb6090 R15: 00007fffbcec4078
 </TASK>

Showing all locks held in the system:
3 locks held by kworker/0:0/9:
 #0: ffff88801a480d48 ((wq_completion)events){+.+.}-{0:0}, at: process_scheduled_works+0x9b4/0x17b0
 #1: ffffc900000c7bc0 (deferred_process_work){+.+.}-{0:0}, at: process_scheduled_works+0x9ef/0x17b0
 #2: ffffffff8f537dc8 (rtnl_mutex){+.+.}-{4:4}, at: switchdev_deferred_process_work+0xe/0x20
4 locks held by kworker/u8:1/13:
 #0: ffff88801b2f7148 ((wq_completion)netns){+.+.}-{0:0}, at: process_scheduled_works+0x9b4/0x17b0
 #1: ffffc90000107bc0 (net_cleanup_work){+.+.}-{0:0}, at: process_scheduled_works+0x9ef/0x17b0
 #2: ffffffff8f52af70 (pernet_ops_rwsem){++++}-{4:4}, at: cleanup_net+0xf7/0x800
 #3: ffffffff8f537dc8 (rtnl_mutex){+.+.}-{4:4}, at: wg_netns_pre_exit+0x1c/0x1d0
1 lock held by khungtaskd/34:
 #0: ffffffff8e139ea0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
1 lock held by dhcpcd/5592:
 #0: ffffffff8f537dc8 (rtnl_mutex){+.+.}-{4:4}, at: inet6_rtm_newaddr+0x5b7/0xd20
2 locks held by getty/5674:
 #0: ffff88810652d0a0 (&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
3 locks held by kworker/u8:3/5871:
 #0: ffff888029281948 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_scheduled_works+0x9b4/0x17b0
 #1: ffffc900035ffbc0 ((work_completion)(&(&net->ipv6.addr_chk_work)->work)){+.+.}-{0:0}, at: process_scheduled_works+0x9ef/0x17b0
 #2: ffffffff8f537dc8 (rtnl_mutex){+.+.}-{4:4}, at: addrconf_verify_work+0x19/0x30
3 locks held by kworker/0:5/5910:
 #0: ffff88801a482148 ((wq_completion)events_power_efficient){+.+.}-{0:0}, at: process_scheduled_works+0x9b4/0x17b0
 #1: ffffc9000390fbc0 ((reg_check_chans).work){+.+.}-{0:0}, at: process_scheduled_works+0x9ef/0x17b0
 #2: ffffffff8f537dc8 (rtnl_mutex){+.+.}-{4:4}, at: reg_check_chans_work+0x95/0xf30
7 locks held by syz.0.2013/12986:
1 lock held by syz.2.2016/12997:
 #0: ffffffff8f537dc8 (rtnl_mutex){+.+.}-{4:4}, at: __tun_chr_ioctl+0x37a/0x1df0
1 lock held by syz.2.2016/12998:
 #0: ffffffff8f537dc8 (rtnl_mutex){+.+.}-{4:4}, at: __tun_chr_ioctl+0x37a/0x1df0
1 lock held by syz.1.2021/13018:
 #0: ffffffff8f537dc8 (rtnl_mutex){+.+.}-{4:4}, at: dev_ioctl+0x83c/0x1150
1 lock held by syz-executor/13024:
 #0: ffffffff8f537dc8 (rtnl_mutex){+.+.}-{4:4}, at: inet_rtm_newaddr+0x3b0/0x18b0
1 lock held by syz-executor/13029:
 #0: ffffffff8f537dc8 (rtnl_mutex){+.+.}-{4:4}, at: inet_rtm_newaddr+0x3b0/0x18b0
1 lock held by syz-executor/13032:
 #0: ffffffff8f537dc8 (rtnl_mutex){+.+.}-{4:4}, at: inet_rtm_newaddr+0x3b0/0x18b0
1 lock held by syz-executor/13038:
 #0: ffffffff8f537dc8 (rtnl_mutex){+.+.}-{4:4}, at: inet_rtm_newaddr+0x3b0/0x18b0
1 lock held by syz-executor/13043:
 #0: ffffffff8f537dc8 (rtnl_mutex){+.+.}-{4:4}, at: inet_rtm_newaddr+0x3b0/0x18b0
1 lock held by syz-executor/13046:
 #0: ffffffff8f537dc8 (rtnl_mutex){+.+.}-{4:4}, at: inet_rtm_newaddr+0x3b0/0x18b0
1 lock held by syz-executor/13053:
 #0: ffffffff8f537dc8 (rtnl_mutex){+.+.}-{4:4}, at: inet_rtm_newaddr+0x3b0/0x18b0
1 lock held by syz-executor/13058:
 #0: ffffffff8f537dc8 (rtnl_mutex){+.+.}-{4:4}, at: inet_rtm_newaddr+0x3b0/0x18b0
1 lock held by syz-executor/13064:
 #0: ffffffff8f537dc8 (rtnl_mutex){+.+.}-{4:4}, at: inet_rtm_newaddr+0x3b0/0x18b0

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

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: 12986 Comm: syz.0.2013 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:__lock_acquire+0x893/0xd20
Code: 83 3d a4 49 06 0e 00 0f 85 36 02 00 00 48 83 7c 24 28 00 0f 84 bc 01 00 00 41 8b 46 f8 25 ff 1f 00 00 48 0f a3 05 ad 9b 0a 12 <0f> 83 5a 01 00 00 48 69 c0 c8 00 00 00 48 8d 80 10 03 49 93 e9 87
RSP: 0018:ffffc900001dea80 EFLAGS: 00000003
RAX: 0000000000000007 RBX: 0000000000000007 RCX: 0000000041178ce3
RDX: 00000000e61b7dd1 RSI: 000000008eba6367 RDI: ffff888021798000
RBP: 0000000000000000 R08: 0000000000000000 R09: ffffffff8172c195
R10: ffffc900001ded30 R11: fffff5200003bda8 R12: 00000000f53f6a58
R13: ffff888021798af0 R14: ffff888021798c08 R15: f501fefe41178ce3
FS:  00007f27ec2386c0(0000) GS:ffff8881a3c1c000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000556db7523ea0 CR3: 000000010d808000 CR4: 00000000000006f0
Call Trace:
 <IRQ>
 lock_acquire+0x120/0x360
 unwind_next_frame+0xc2/0x2390
 perf_callchain_kernel+0x469/0x5c0
 get_perf_callchain+0x3f3/0x6b0
 perf_prepare_sample+0x475/0x2390
 perf_event_output_forward+0x151/0x430
 __perf_event_overflow+0x7cf/0xe10
 perf_swevent_hrtimer+0x3c5/0x550
 __hrtimer_run_queues+0x4e0/0xc60
 hrtimer_interrupt+0x45b/0xaa0
 __sysvec_apic_timer_interrupt+0x10b/0x410
 sysvec_apic_timer_interrupt+0x52/0xc0
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:lock_acquire+0x175/0x360
Code: 00 00 00 00 9c 8f 44 24 30 f7 44 24 30 00 02 00 00 0f 85 cd 00 00 00 f7 44 24 08 00 02 00 00 74 01 fb 65 48 8b 05 4b e3 02 11 <48> 3b 44 24 58 0f 85 f2 00 00 00 48 83 c4 60 5b 41 5c 41 5d 41 5e
RSP: 0018:ffffc900001df7d8 EFLAGS: 00000206
RAX: f6f711af4fe99200 RBX: 0000000000000000 RCX: f6f711af4fe99200
RDX: 0000000000000000 RSI: ffffffff8dba5cac RDI: ffffffff8be33300
RBP: ffffffff8172c195 R08: 0000000000000000 R09: ffffffff8172c195
R10: ffffc900001df998 R11: ffffffff81ac3930 R12: 0000000000000002
R13: ffffffff8e139ea0 R14: 0000000000000000 R15: 0000000000000246
 unwind_next_frame+0xc2/0x2390
 arch_stack_walk+0x11c/0x150
 stack_trace_save+0x9c/0xe0
 kasan_save_track+0x3e/0x80
 kasan_save_free_info+0x46/0x50
 __kasan_slab_free+0x5b/0x80
 kmem_cache_free+0x18f/0x400
 skb_release_data+0x62d/0x7c0
 __kfree_skb+0x55/0x70
 tcp_rcv_state_process+0x1440/0x4140
 tcp_v4_do_rcv+0x3f2/0xce0
 tcp_v4_rcv+0x26a6/0x2f40
 ip_protocol_deliver_rcu+0x221/0x440
 ip_local_deliver_finish+0x3bb/0x6f0
 NF_HOOK+0x30c/0x3a0
 ip_sublist_rcv_finish+0x221/0x2a0
 ip_sublist_rcv+0x6e7/0x9b0
 ip_list_rcv+0x3e2/0x430
 __netif_receive_skb_list_core+0x7d2/0x800
 netif_receive_skb_list_internal+0x975/0xcc0
 napi_complete_done+0x2f2/0x7c0
 e1000_clean+0xd0b/0x2b00
 __napi_poll+0xc7/0x360
 net_rx_action+0x707/0xe30
 handle_softirqs+0x286/0x870
 __irq_exit_rcu+0xca/0x1f0
 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+0xb0/0x150
Code: 24 20 f6 44 24 21 02 74 0c 90 0f 0b 48 f7 03 08 00 00 00 74 64 bf 01 00 00 00 e8 fb 98 15 f6 e8 36 f3 4c f6 fb bf 01 00 00 00 <e8> 5b ab ff ff 48 c7 44 24 40 00 00 00 00 9c 8f 44 24 40 8b 44 24
RSP: 0018:ffffc90004fb6e80 EFLAGS: 00000282
RAX: f6f711af4fe99200 RBX: 0000000000000000 RCX: f6f711af4fe99200
RDX: 0000000000000007 RSI: ffffffff8d9b6a0a RDI: 0000000000000001
RBP: ffffc90004fb6f30 R08: ffffffff8fa38037 R09: 1ffffffff1f47006
R10: dffffc0000000000 R11: fffffbfff1f47007 R12: 0000000000000000
R13: 0000000000000000 R14: dffffc0000000000 R15: 1ffff920009f6dd0
 irqentry_exit+0x6f/0x90
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:put_cpu_partial+0x1b4/0x250
Code: 85 b5 00 00 00 48 83 c4 20 5b 41 5c 41 5d 41 5e 41 5f 5d c3 cc cc cc cc cc e8 18 6d 60 09 f7 c5 00 02 00 00 74 bc fb 4d 85 e4 <75> bb eb c4 90 e8 02 ac ab 02 85 c0 74 22 83 3d 4b e6 8a 0d 00 75
RSP: 0018:ffffc90004fb6ff8 EFLAGS: 00000246
RAX: f6f711af4fe99200 RBX: ffff88801a441780 RCX: f6f711af4fe99200
RDX: 0000000000000007 RSI: ffffffff8d9b6a0a RDI: ffffffff8be33300
RBP: 0000000000000282 R08: ffffffff8fa38037 R09: 1ffffffff1f47006
R10: dffffc0000000000 R11: fffffbfff1f47007 R12: 0000000000000000
R13: 0000000000000001 R14: ffff888021798000 R15: ffff88813663e4d0
 __slab_free+0x2d5/0x3c0
 qlist_free_all+0x97/0x140
 kasan_quarantine_reduce+0x148/0x160
 __kasan_kmalloc+0x22/0xb0
 __kmalloc_noprof+0x27a/0x4f0
 fib6_info_alloc+0x30/0xf0
 ip6_route_info_create+0x142/0x860
 addrconf_f6i_alloc+0x1d2/0x450
 ipv6_add_addr+0x56e/0x1090
 add_addr+0x8b/0x2d0
 add_v4_addrs+0x70c/0xbd0
 addrconf_init_auto_addrs+0x2c4/0xa30
 addrconf_notify+0xacc/0x1010
 notifier_call_chain+0x1b6/0x3e0
 __dev_notify_flags+0x18d/0x2e0
 netif_change_flags+0xe8/0x1a0
 dev_change_flags+0x130/0x260
 dev_ioctl+0x7b4/0x1150
 sock_do_ioctl+0x22c/0x300
 sock_ioctl+0x576/0x790
 __se_sys_ioctl+0xfc/0x170
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f27eb38ebe9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f27ec238038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f27eb5b5fa0 RCX: 00007f27eb38ebe9
RDX: 0000200000000040 RSI: 0000000000008914 RDI: 0000000000000009
RBP: 00007f27eb411e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f27eb5b6038 R14: 00007f27eb5b5fa0 R15: 00007ffdafbe8858
 </TASK>
