INFO: task kworker/u8:1:13 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/u8:1    state:D stack:23640 pid:13    tgid:13    ppid:2      task_flags:0x4208060 flags:0x00080000
Workqueue: ipv6_addrconf addrconf_verify_work
Call Trace:
 <TASK>
 __schedule+0x14ef/0x4fb0
 schedule+0x164/0x360
 schedule_preempt_disabled+0x13/0x30
 __mutex_lock+0x829/0x1340
 addrconf_verify_work+0x19/0x30
 process_scheduled_works+0xaec/0x17a0
 worker_thread+0x89f/0xd90
 kthread+0x726/0x8b0
 ret_from_fork+0x51b/0xa40
 ret_from_fork_asm+0x1a/0x30
 </TASK>
INFO: task dhcpcd:5577 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:20408 pid:5577  tgid:5577  ppid:5576   task_flags:0x400140 flags:0x00080000
Call Trace:
 <TASK>
 __schedule+0x14ef/0x4fb0
 schedule+0x164/0x360
 schedule_preempt_disabled+0x13/0x30
 __mutex_lock+0x829/0x1340
 rtnl_dumpit+0x92/0x200
 netlink_dump+0x722/0xe80
 netlink_recvmsg+0x690/0xa50
 sock_recvmsg+0x22c/0x270
 ____sys_recvmsg+0x1e6/0x4a0
 ___sys_recvmsg+0x215/0x590
 __x64_sys_recvmsg+0x1ba/0x2a0
 do_syscall_64+0xe2/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f67e89ee91e
RSP: 002b:00007fffad7b8838 EFLAGS: 00000246 ORIG_RAX: 000000000000002f
RAX: ffffffffffffffda RBX: 00007fffad7b9960 RCX: 00007f67e89ee91e
RDX: 0000000000000000 RSI: 00007fffad7b9880 RDI: 0000000000000015
RBP: 00007fffad7b98f0 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000000000cf R11: 0000000000000246 R12: 0000000000000bdc
R13: 00007fffad7b9864 R14: 00007fffad7b9880 R15: 00007fffad7b9870
 </TASK>
INFO: task syz-executor:8632 blocked for more than 146 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor    state:D stack:24480 pid:8632  tgid:8632  ppid:1      task_flags:0x400140 flags:0x00080002
Call Trace:
 <TASK>
 __schedule+0x14ef/0x4fb0
 schedule+0x164/0x360
 schedule_preempt_disabled+0x13/0x30
 __mutex_lock+0x829/0x1340
 ip6mr_net_exit_batch+0x20/0x90
 ops_undo_list+0x52b/0x940
 setup_net+0x2f0/0x340
 copy_net_ns+0x3e2/0x570
 create_new_namespaces+0x3e7/0x6a0
 unshare_nsproxy_namespaces+0x11a/0x160
 ksys_unshare+0x4f4/0x900
 __x64_sys_unshare+0x38/0x50
 do_syscall_64+0xe2/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f1f8999bfa7
RSP: 002b:00007fff33bb6688 EFLAGS: 00000202 ORIG_RAX: 0000000000000110
RAX: ffffffffffffffda RBX: 00007f1f89c15f40 RCX: 00007f1f8999bfa7
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000040000000
RBP: 00007f1f89c167b8 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000008
R13: 0000000000000003 R14: 00007fff33bb68c8 R15: 0000000000000000
 </TASK>
INFO: task syz-executor:8652 blocked for more than 147 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor    state:D stack:25256 pid:8652  tgid:8652  ppid:1      task_flags:0x400140 flags:0x00080002
Call Trace:
 <TASK>
 __schedule+0x14ef/0x4fb0
 schedule+0x164/0x360
 schedule_preempt_disabled+0x13/0x30
 __mutex_lock+0x829/0x1340
 caif_exit_net+0x6a/0x4a0
 ops_undo_list+0x49f/0x940
 setup_net+0x2f0/0x340
 copy_net_ns+0x3e2/0x570
 create_new_namespaces+0x3e7/0x6a0
 unshare_nsproxy_namespaces+0x11a/0x160
 ksys_unshare+0x4f4/0x900
 __x64_sys_unshare+0x38/0x50
 do_syscall_64+0xe2/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fb065f9bfa7
RSP: 002b:00007ffe78060558 EFLAGS: 00000206 ORIG_RAX: 0000000000000110
RAX: ffffffffffffffda RBX: 00007fb066215f40 RCX: 00007fb065f9bfa7
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000040000000
RBP: 00007fb0662167b8 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000008
R13: 0000000000000003 R14: 00007ffe78060798 R15: 0000000000000000
 </TASK>
INFO: task syz-executor:8660 blocked for more than 148 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor    state:D stack:25400 pid:8660  tgid:8660  ppid:1      task_flags:0x400140 flags:0x00080002
Call Trace:
 <TASK>
 __schedule+0x14ef/0x4fb0
 schedule+0x164/0x360
 schedule_preempt_disabled+0x13/0x30
 __mutex_lock+0x829/0x1340
 ops_undo_list+0x2a4/0x940
 setup_net+0x2f0/0x340
 copy_net_ns+0x3e2/0x570
 create_new_namespaces+0x3e7/0x6a0
 unshare_nsproxy_namespaces+0x11a/0x160
 ksys_unshare+0x4f4/0x900
 __x64_sys_unshare+0x38/0x50
 do_syscall_64+0xe2/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f343a19bfa7
RSP: 002b:00007ffc1cdd62c8 EFLAGS: 00000202 ORIG_RAX: 0000000000000110
RAX: ffffffffffffffda RBX: 00007f343a415f40 RCX: 00007f343a19bfa7
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000040000000
RBP: 00007f343a4167b8 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000008
R13: 0000000000000003 R14: 00007ffc1cdd6508 R15: 0000000000000000
 </TASK>
INFO: task syz-executor:8699 blocked for more than 149 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor    state:D stack:25656 pid:8699  tgid:8699  ppid:1      task_flags:0x400140 flags:0x00080002
Call Trace:
 <TASK>
 __schedule+0x14ef/0x4fb0
 schedule+0x164/0x360
 schedule_preempt_disabled+0x13/0x30
 __mutex_lock+0x829/0x1340
 rtnl_newlink+0x8a1/0x1be0
 rtnetlink_rcv_msg+0x7d5/0xbe0
 netlink_rcv_skb+0x232/0x4b0
 netlink_unicast+0x80f/0x9b0
 netlink_sendmsg+0x813/0xb40
 __sock_sendmsg+0x21c/0x270
 __sys_sendto+0x3c0/0x550
 __x64_sys_sendto+0xde/0x100
 do_syscall_64+0xe2/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fa87d75b58e
RSP: 002b:00007ffc6644a568 EFLAGS: 00000246 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 000055557b895500 RCX: 00007fa87d75b58e
RDX: 000000000000002c RSI: 00007fa87e544670 RDI: 0000000000000003
RBP: 0000000000000001 R08: 00007ffc6644a5e4 R09: 000000000000000c
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000003
R13: 0000000000000000 R14: 00007fa87e544670 R15: 0000000000000000
 </TASK>

Showing all locks held in the system:
3 locks held by kworker/u8:1/13:
 #0: ffff888173ddb948 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_scheduled_works+0x9d4/0x17a0
 #1: ffffc90000127bc0 ((work_completion)(&(&net->ipv6.addr_chk_work)->work)){+.+.}-{0:0}, at: process_scheduled_works+0xa0f/0x17a0
 #2: ffffffff8f714fc8 (rtnl_mutex){+.+.}-{4:4}, at: addrconf_verify_work+0x19/0x30
3 locks held by kworker/1:0/24:
 #0: ffff888100075948 ((wq_completion)events){+.+.}-{0:0}, at: process_scheduled_works+0x9d4/0x17a0
 #1: ffffc900001e7bc0 (deferred_process_work){+.+.}-{0:0}, at: process_scheduled_works+0xa0f/0x17a0
 #2: ffffffff8f714fc8 (rtnl_mutex){+.+.}-{4:4}, at: switchdev_deferred_process_work+0xe/0x20
1 lock held by khungtaskd/35:
 #0: ffffffff8e341b20 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
3 locks held by kworker/u9:5/191:
 #0: ffff888100089948 ((wq_completion)events_unbound#2){+.+.}-{0:0}, at: process_scheduled_works+0x9d4/0x17a0
 #1: ffffc90003577bc0 ((linkwatch_work).work){+.+.}-{0:0}, at: process_scheduled_works+0xa0f/0x17a0
 #2: ffffffff8f714fc8 (rtnl_mutex){+.+.}-{4:4}, at: linkwatch_event+0xe/0x60
2 locks held by dhcpcd/5577:
 #0: ffff88811ed016f0 (nlk_cb_mutex-ROUTE){+.+.}-{4:4}, at: netlink_dump+0xe4/0xe80
 #1: ffffffff8f714fc8 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_dumpit+0x92/0x200
2 locks held by getty/5657:
 #0: ffff888111ffe0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70
 #1: ffffc9000356b2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x45c/0x13c0
6 locks held by kworker/u8:2/5845:
5 locks held by kworker/u8:14/8493:
 #0: ffff888100ef7948 ((wq_completion)netns){+.+.}-{0:0}, at: process_scheduled_works+0x9d4/0x17a0
 #1: ffffc90004087bc0 (net_cleanup_work){+.+.}-{0:0}, at: process_scheduled_works+0xa0f/0x17a0
 #2: ffffffff8f707bf0 (pernet_ops_rwsem){++++}-{4:4}, at: cleanup_net+0xfe/0x7b0
 #3: ffffffff8f714fc8 (rtnl_mutex){+.+.}-{4:4}, at: ops_undo_list+0x2a4/0x940
 #4: ffffffff8e347678 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x2d0/0x770
2 locks held by syz-executor/8632:
 #0: ffffffff8f707bf0 (pernet_ops_rwsem){++++}-{4:4}, at: copy_net_ns+0x3cb/0x570
 #1: ffffffff8f714fc8 (rtnl_mutex){+.+.}-{4:4}, at: ip6mr_net_exit_batch+0x20/0x90
2 locks held by syz-executor/8652:
 #0: ffffffff8f707bf0 (pernet_ops_rwsem){++++}-{4:4}, at: copy_net_ns+0x3cb/0x570
 #1: ffffffff8f714fc8 (rtnl_mutex){+.+.}-{4:4}, at: caif_exit_net+0x6a/0x4a0
2 locks held by syz-executor/8660:
 #0: ffffffff8f707bf0 (pernet_ops_rwsem){++++}-{4:4}, at: copy_net_ns+0x3cb/0x570
 #1: ffffffff8f714fc8 (rtnl_mutex){+.+.}-{4:4}, at: ops_undo_list+0x2a4/0x940
2 locks held by syz-executor/8692:
 #0: ffffffff8f707bf0 (pernet_ops_rwsem){++++}-{4:4}, at: copy_net_ns+0x3cb/0x570
 #1: ffffffff8f714fc8 (rtnl_mutex){+.+.}-{4:4}, at: ops_undo_list+0x2a4/0x940
2 locks held by syz-executor/8694:
 #0: ffffffff8f707bf0 (pernet_ops_rwsem){++++}-{4:4}, at: copy_net_ns+0x3cb/0x570
 #1: ffffffff8f714fc8 (rtnl_mutex){+.+.}-{4:4}, at: ops_undo_list+0x2a4/0x940
1 lock held by syz-executor/8699:
 #0: ffffffff8f714fc8 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_newlink+0x8a1/0x1be0
1 lock held by syz-executor/8709:
 #0: ffffffff8f714fc8 (rtnl_mutex){+.+.}-{4:4}, at: inet_rtm_newaddr+0x404/0x1ad0
1 lock held by syz-executor/8710:
 #0: ffffffff8f714fc8 (rtnl_mutex){+.+.}-{4:4}, at: inet_rtm_newaddr+0x404/0x1ad0
1 lock held by syz-executor/8714:
 #0: ffffffff8f714fc8 (rtnl_mutex){+.+.}-{4:4}, at: inet_rtm_newaddr+0x404/0x1ad0
1 lock held by syz-executor/8722:
 #0: ffffffff8f714fc8 (rtnl_mutex){+.+.}-{4:4}, at: inet_rtm_newaddr+0x404/0x1ad0
1 lock held by syz-executor/8727:
 #0: ffffffff8f714fc8 (rtnl_mutex){+.+.}-{4:4}, at: inet_rtm_newaddr+0x404/0x1ad0
1 lock held by syz-executor/8729:
 #0: ffffffff8f714fc8 (rtnl_mutex){+.+.}-{4:4}, at: inet_rtm_newaddr+0x404/0x1ad0
1 lock held by syz-executor/8735:
 #0: ffffffff8f714fc8 (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+0xf90/0xfe0
 kthread+0x726/0x8b0
 ret_from_fork+0x51b/0xa40
 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: 5280 Comm: udevd 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+0x3d/0x2cf0
Code: 8b 05 77 72 22 11 48 89 84 24 e0 00 00 00 65 48 8b 05 4f 72 22 11 48 89 44 24 08 31 ed 83 3d d9 87 23 0e 00 0f 84 ef 13 00 00 <45> 89 cf 49 89 f9 48 8b 07 48 3d c0 33 85 93 0f 84 da 13 00 00 41
RSP: 0018:ffffc90003217210 EFLAGS: 00000002
RAX: ffff888100b53a80 RBX: 0000000000000000 RCX: 0000000000000002
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff8e341b20
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: ffffc90003217518 R11: ffffffff81ae37b0 R12: 0000000000000002
R13: ffffffff8e341b20 R14: 0000000000000000 R15: 0000000000000246
FS:  00007fa5c309cc80(0000) GS:ffff8882a9a08000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fa5c3278866 CR3: 0000000112cdc000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 lock_acquire+0x106/0x330
 unwind_next_frame+0xc2/0x23c0
 arch_stack_walk+0x11b/0x150
 stack_trace_save+0xa9/0x100
 kasan_save_track+0x3e/0x80
 __kasan_kmalloc+0x93/0xb0
 __kmalloc_noprof+0x40c/0x7e0
 tomoyo_encode+0x28b/0x550
 tomoyo_realpath_from_path+0x58d/0x5d0
 tomoyo_path_perm+0x283/0x560
 security_inode_getattr+0x12b/0x310
 vfs_statx+0x1b3/0x570
 vfs_fstatat+0x118/0x170
 __x64_sys_newfstatat+0x151/0x200
 do_syscall_64+0xe2/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fa5c31725f4
Code: 64 c7 00 09 00 00 00 83 c8 ff c3 48 89 f2 b9 00 01 00 00 48 89 fe bf 9c ff ff ff e9 00 00 00 00 41 89 ca b8 06 01 00 00 0f 05 <45> 31 c0 3d 00 f0 ff ff 76 10 48 8b 15 03 a8 0d 00 f7 d8 41 83 c8
RSP: 002b:00007ffed373d508 EFLAGS: 00000246 ORIG_RAX: 0000000000000106
RAX: ffffffffffffffda RBX: 000055a10f55cce0 RCX: 00007fa5c31725f4
RDX: 00007ffed373d518 RSI: 000055a0f084a302 RDI: 00000000ffffff9c
RBP: 000055a10f54c910 R08: 00000000ffffffff R09: 3fffffffffffffff
R10: 0000000000000000 R11: 0000000000000246 R12: 000055a0f085e5e8
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
 </TASK>
