INFO: task dhcpcd:5337 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:dhcpcd          state:D stack:21736 pid:5337  tgid:5337  ppid:5336   task_flags:0x400140 flags:0x00080800
Call Trace:
 <TASK>
 __schedule+0x17d9/0x56c0
 schedule+0x164/0x2b0
 schedule_preempt_disabled+0x13/0x30
 __mutex_lock+0x7bf/0x1550
 rtnl_dump_ifinfo+0xa74/0x14a0
 rtnl_dumpit+0xcc/0x200
 netlink_dump+0x711/0xee0
 netlink_recvmsg+0x683/0xa50
 sock_recvmsg+0x196/0x1e0
 ____sys_recvmsg+0x1e6/0x4a0
 ___sys_recvmsg+0x213/0x5a0
 __x64_sys_recvmsg+0x1ae/0x290
 do_syscall_64+0x174/0x580
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7feaa123b91e
RSP: 002b:00007ffca49c6f28 EFLAGS: 00000246 ORIG_RAX: 000000000000002f
RAX: ffffffffffffffda RBX: 00007ffca49c8050 RCX: 00007feaa123b91e
RDX: 0000000000000000 RSI: 00007ffca49c7f70 RDI: 000000000000000c
RBP: 00007ffca49c7fe0 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000000000bc R11: 0000000000000246 R12: 0000000000000ab8
R13: 00007ffca49c7f54 R14: 00007ffca49c7f70 R15: 00007ffca49c7f60
 </TASK>
INFO: task kworker/1:11:22269 blocked for more than 144 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/1:11    state:D stack:23944 pid:22269 tgid:22269 ppid:2      task_flags:0x4208060 flags:0x00080000
Workqueue: events netdev_work_proc
Call Trace:
 <TASK>
 __schedule+0x17d9/0x56c0
 schedule+0x164/0x2b0
 schedule_preempt_disabled+0x13/0x30
 __mutex_lock+0x7bf/0x1550
 netdev_work_proc+0x6f/0x770
 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 kworker/u10:46:32224 blocked for more than 144 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/u10:46  state:D stack:22600 pid:32224 tgid:32224 ppid:2      task_flags:0x4208060 flags:0x00080000
Workqueue: events_unbound linkwatch_event
Call Trace:
 <TASK>
 __schedule+0x17d9/0x56c0
 schedule+0x164/0x2b0
 schedule_preempt_disabled+0x13/0x30
 __mutex_lock+0x7bf/0x1550
 linkwatch_event+0xe/0x60
 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:6179 blocked for more than 145 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor    state:D stack:23280 pid:6179  tgid:6179  ppid:1      task_flags:0x400140 flags:0x00080002
Call Trace:
 <TASK>
 __schedule+0x17d9/0x56c0
 schedule+0x164/0x2b0
 schedule_preempt_disabled+0x13/0x30
 __mutex_lock+0x7bf/0x1550
 rtnl_newlink+0xc10/0x1c30
 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: 0033:0x7f565b95e90e
RSP: 002b:00007ffc59918c68 EFLAGS: 00000246 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 000055556c38c500 RCX: 00007f565b95e90e
RDX: 000000000000004c RSI: 00007f565c754670 RDI: 0000000000000003
RBP: 0000000000000001 R08: 00007ffc59918ce4 R09: 000000000000000c
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000003
R13: 0000000000000000 R14: 00007f565c754670 R15: 0000000000000000
 </TASK>
INFO: task syz-executor:6185 blocked for more than 145 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor    state:D stack:22568 pid:6185  tgid:6185  ppid:1      task_flags:0x400140 flags:0x00080002
Call Trace:
 <TASK>
 __schedule+0x17d9/0x56c0
 schedule+0x164/0x2b0
 schedule_preempt_disabled+0x13/0x30
 __mutex_lock+0x7bf/0x1550
 rtnl_newlink+0xc10/0x1c30
 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: 0033:0x7f6113d5e90e
RSP: 002b:00007ffde0324578 EFLAGS: 00000246 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 0000555579f87500 RCX: 00007f6113d5e90e
RDX: 0000000000000054 RSI: 00007f6114b54670 RDI: 0000000000000003
RBP: 0000000000000001 R08: 00007ffde03245f4 R09: 000000000000000c
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000003
R13: 0000000000000000 R14: 00007f6114b54670 R15: 0000000000000000
 </TASK>
INFO: task syz-executor:6188 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:23528 pid:6188  tgid:6188  ppid:1      task_flags:0x400140 flags:0x00080002
Call Trace:
 <TASK>
 __schedule+0x17d9/0x56c0
 </TASK>

Showing all locks held in the system:
3 locks held by kworker/u8:1/13:
 #0: ffff8881758dd940 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_scheduled_works+0xa20/0x14e0
 #1: ffffc90000127c40 ((work_completion)(&(&net->ipv6.addr_chk_work)->work)){+.+.}-{0:0}, at: process_scheduled_works+0xa20/0x14e0
 #2: ffffffff900650c0 (rtnl_mutex){+.+.}-{4:4}, at: bond_mii_monitor+0x1234/0x3260
1 lock held by khungtaskd/35:
 #0: ffffffff8eb95c60 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
2 locks held by getty/5418:
 #0: ffff88810f3660a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70
 #1: ffffc900034732e8 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x45a/0x1360
3 locks held by kworker/u8:4/6846:
3 locks held by kworker/1:7/22264:
 #0: ffff88810006b140 ((wq_completion)events){+.+.}-{0:0}, at: process_scheduled_works+0xa20/0x14e0
 #1: ffffc90003807c40 (free_ipc_work){+.+.}-{0:0}, at: process_scheduled_works+0xa20/0x14e0
 #2: ffffffff8eb9bf68 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x2d0/0x770
3 locks held by kworker/u8:5/24302:
1 lock held by syz-executor/6185:
1 lock held by syz-executor/6284:
 #0: ffffffff8eb9bf68 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x38d/0x770
2 locks held by dhcpcd-run-hook/6316:

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

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: 6277 Comm: syz-executor 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:lockdep_hardirqs_off+0x2e/0xd0
Code: 41 56 53 83 3d c2 1e 8b 04 00 0f 84 84 00 00 00 48 89 fb 65 8b 05 a2 c9 9f 07 a9 00 00 f0 00 74 5c 83 3d e4 1e ab 0e 00 75 09 <9c> 58 a9 00 02 00 00 75 6a 65 8b 05 da 09 a0 07 85 c0 74 56 65 4c
RSP: 0018:ffffc9000447f790 EFLAGS: 00000046
RAX: 0000000000000000 RBX: ffffffff8bd2dd4a RCX: 0000000000000046
RDX: 0000000000000000 RSI: ffffffff8e297381 RDI: ffffffff8c4bb880
RBP: 0000000000000001 R08: ffffc9000447f83f R09: 0000000000000000
R10: ffffc9000447f818 R11: fffff5200088ff08 R12: 0000000000000000
R13: ffff8881b8c49000 R14: ffffffff9aa0a688 R15: 0000000000000000
FS:  00005555784f4500(0000) GS:ffff8882a8f21000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055b194fbd950 CR3: 00000001be554000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 trace_hardirqs_off+0x12/0x40
 _raw_spin_lock_irqsave+0x1a/0x60
 debug_check_no_obj_freed+0xcb/0x450
 free_pages_prepare+0x489/0xa60
 __free_contig_range_common+0x174/0x340
 free_pages_bulk+0x48/0x120
 vfree+0x224/0x4a0
 kcov_close+0x28/0x50
 __fput+0x418/0xa50
 task_work_run+0x1d9/0x270
 do_exit+0x73a/0x2360
 do_group_exit+0x22d/0x2f0
 get_signal+0x121b/0x12c0
 arch_do_signal_or_restart+0xbb/0x860
 exit_to_user_mode_loop+0x104/0x730
 do_syscall_64+0x353/0x580
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fc552f5e90e
Code: Unable to access opcode bytes at 0x7fc552f5e8e4.
RSP: 002b:00007ffcec5c56f8 EFLAGS: 00000246 ORIG_RAX: 000000000000002c
RAX: 0000000000000028 RBX: 00005555784f4500 RCX: 00007fc552f5e90e
RDX: 0000000000000028 RSI: 00007fc553d54670 RDI: 0000000000000003
RBP: 0000000000000001 R08: 00007ffcec5c5774 R09: 000000000000000c
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000003
R13: 0000000000000000 R14: 00007fc553d54670 R15: 0000000000000000
 </TASK>
