INFO: task kworker/u8:4:5675 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/u8:4    state:D stack:24528 pid:5675  tgid:5675  ppid:2      task_flags:0x4208060 flags:0x00080000
Workqueue: ipv6_addrconf addrconf_verify_work
Call Trace:
 <TASK>
 __schedule+0x17d9/0x56c0
 schedule+0x164/0x360
 schedule_preempt_disabled+0x13/0x30
 __mutex_lock+0x7bf/0x1550
 addrconf_verify_work+0x19/0x30
 process_scheduled_works+0xa8e/0x14e0
 worker_thread+0xa47/0xfb0
 kthread+0x388/0x470
 ret_from_fork+0x514/0xb70
 ret_from_fork_asm+0x1a/0x30
 </TASK>
INFO: task syz-executor:26801 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:27120 pid:26801 tgid:26801 ppid:1      task_flags:0x400140 flags:0x00080002
Call Trace:
 <TASK>
 __schedule+0x17d9/0x56c0
 schedule+0x164/0x360
 schedule_preempt_disabled+0x13/0x30
 __mutex_lock+0x7bf/0x1550
 inet_rtm_newaddr+0x464/0x19e0
 rtnetlink_rcv_msg+0x802/0xc00
 netlink_rcv_skb+0x226/0x4a0
 netlink_unicast+0x7bb/0x940
 netlink_sendmsg+0x813/0xb40
 sock_sendmsg_nosec+0x13a/0x180
 __sys_sendto+0x408/0x5a0
 __x64_sys_sendto+0xde/0x100
 do_syscall_64+0x174/0x580
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f881535e90e
RSP: 002b:00007ffc810be178 EFLAGS: 00000246 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 000055556e492500 RCX: 00007f881535e90e
RDX: 0000000000000028 RSI: 00007f8816154670 RDI: 0000000000000003
RBP: 0000000000000001 R08: 00007ffc810be1f4 R09: 000000000000000c
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000003
R13: 0000000000000000 R14: 00007f8816154670 R15: 0000000000000000
 </TASK>
INFO: lockdep is turned off.
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/0x380
 sys_info+0x135/0x170
 watchdog+0xfd7/0x1030
 kthread+0x388/0x470
 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: 26535 Comm: kworker/u8:7 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: bat_events batadv_dat_purge
RIP: 0010:__sanitizer_cov_trace_pc+0x2e/0x70
Code: 48 8b 04 24 65 48 8b 0d 08 9f a3 11 65 8b 15 29 9f a3 11 81 e2 00 01 ff 00 74 11 81 fa 00 01 00 00 75 35 83 b9 24 17 00 00 00 <74> 2c 8b 91 f8 16 00 00 83 fa 02 75 21 48 8b 91 00 17 00 00 48 8b
RSP: 0018:ffffc90000a07220 EFLAGS: 00000246
RAX: ffffffff8a7410f5 RBX: ffffc90000a07380 RCX: ffff8881023a0000
RDX: 0000000000000100 RSI: ffffffff90145f60 RDI: 000000000000000a
RBP: 000000000000000a R08: ffff8881023a0000 R09: 000000000000000b
R10: 000000000000000a R11: 0000000000000100 R12: ffff8881bb4f2740
R13: dffffc0000000000 R14: 0000000000000009 R15: ffffc90000a07328
FS:  0000000000000000(0000) GS:ffff8882a8f79000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fa733675762 CR3: 000000000e946000 CR4: 00000000000006f0
Call Trace:
 <IRQ>
 ipv6_get_saddr_eval+0x245/0xee0
 __ipv6_dev_get_saddr+0x1af/0x440
 ipv6_dev_get_saddr+0x2bf/0xbb0
 ip6_dst_lookup_tail+0xeaf/0x1610
 icmpv6_route_lookup+0xfd/0x610
 icmp6_send+0x114c/0x1b50
 ip6_fragment+0x5a9/0x1e20
 br_nf_dev_queue_xmit+0x105b/0x2540
 NF_HOOK+0x64e/0x6e0
 br_nf_post_routing+0xa53/0xee0
 nf_hook_slow+0xc5/0x220
 NF_HOOK+0x23e/0x3f0
 br_forward_finish+0xd3/0x130
 br_nf_forward_finish+0xa76/0xea0
 NF_HOOK+0x64e/0x6e0
 br_nf_forward_ip+0x7eb/0xa30
 nf_hook_slow+0xc5/0x220
 NF_HOOK+0x23e/0x3f0
 __br_forward+0x397/0x540
 br_handle_frame_finish+0x1175/0x1990
 br_nf_hook_thresh+0x3dd/0x4c0
 br_nf_pre_routing_finish_ipv6+0x90c/0xc40
 br_nf_pre_routing_ipv6+0x382/0x6f0
 br_handle_frame+0x127f/0x1510
 __netif_receive_skb_core+0x989/0x30b0
 process_backlog+0x706/0x1860
 __napi_poll+0xaa/0x330
 net_rx_action+0x61d/0xf50
 handle_softirqs+0x225/0x840
 do_softirq+0x76/0xd0
 </IRQ>
 <TASK>
 __local_bh_enable_ip+0xf8/0x130
 batadv_dat_purge+0x2d7/0x3c0
 process_scheduled_works+0xa8e/0x14e0
 worker_thread+0xa47/0xfb0
 kthread+0x388/0x470
 ret_from_fork+0x514/0xb70
 ret_from_fork_asm+0x1a/0x30
 </TASK>
