INFO: task kworker/u4:3:1171 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/u4:3    state:D stack:24856 pid: 1171 ppid:     2 flags:0x00004000
Workqueue: events_unbound fsnotify_connector_destroy_workfn
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5049 [inline]
 __schedule+0x11ef/0x43c0 kernel/sched/core.c:6395
 schedule+0x11b/0x1e0 kernel/sched/core.c:6478
 schedule_timeout+0xbd/0x2d0 kernel/time/timer.c:2093
 do_wait_for_common+0x2a2/0x450 kernel/sched/completion.c:85
 __wait_for_common kernel/sched/completion.c:106 [inline]
 wait_for_common kernel/sched/completion.c:117 [inline]
 wait_for_completion+0x48/0x60 kernel/sched/completion.c:138
 __synchronize_srcu+0x2bb/0x350 kernel/rcu/srcutree.c:930
 fsnotify_connector_destroy_workfn+0x40/0xa0 fs/notify/mark.c:234
 process_one_work+0x85f/0x1010 kernel/workqueue.c:2310
 worker_thread+0xaa6/0x1290 kernel/workqueue.c:2457
 kthread+0x436/0x520 kernel/kthread.c:334
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
 </TASK>
INFO: task syz-executor:4185 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:21712 pid: 4185 ppid:     1 flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5049 [inline]
 __schedule+0x11ef/0x43c0 kernel/sched/core.c:6395
 schedule+0x11b/0x1e0 kernel/sched/core.c:6478
 exp_funnel_lock kernel/rcu/tree_exp.h:313 [inline]
 synchronize_rcu_expedited+0x680/0x750 kernel/rcu/tree_exp.h:845
 namespace_unlock+0x23f/0x430 fs/namespace.c:1459
 do_umount fs/namespace.c:1683 [inline]
 path_umount+0xf64/0xfd0 fs/namespace.c:1766
 ksys_umount fs/namespace.c:1789 [inline]
 __do_sys_umount fs/namespace.c:1794 [inline]
 __se_sys_umount fs/namespace.c:1792 [inline]
 __x64_sys_umount+0x12d/0x170 fs/namespace.c:1792
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7fb8dac34a57
RSP: 002b:00007ffcae7e22d8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: ffffffffffffffda RBX: 00007fb8dacc96d5 RCX: 00007fb8dac34a57
RDX: 00007fb8dac32687 RSI: 0000000000000002 RDI: 00007fb8dacc9961
RBP: 00007fb8dacc9909 R08: 0000000000000000 R09: 00007fb8daead7b8
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fb8dac9e4a0
R13: 00007fb8dac9e478 R14: 00007ffcae7e2548 R15: 0000000000000000
 </TASK>
INFO: task syz-executor:4186 blocked for more than 144 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor    state:D stack:20592 pid: 4186 ppid:     1 flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5049 [inline]
 __schedule+0x11ef/0x43c0 kernel/sched/core.c:6395
 schedule+0x11b/0x1e0 kernel/sched/core.c:6478
 synchronize_rcu_expedited+0x5c1/0x750 kernel/rcu/tree_exp.h:861
 namespace_unlock+0x23f/0x430 fs/namespace.c:1459
 do_umount fs/namespace.c:1683 [inline]
 path_umount+0xf64/0xfd0 fs/namespace.c:1766
 ksys_umount fs/namespace.c:1789 [inline]
 __do_sys_umount fs/namespace.c:1794 [inline]
 __se_sys_umount fs/namespace.c:1792 [inline]
 __x64_sys_umount+0x12d/0x170 fs/namespace.c:1792
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f78293e3a57
RSP: 002b:00007ffe24b542f8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: ffffffffffffffda RBX: 00007f78294786d5 RCX: 00007f78293e3a57
RDX: 00007f78293e1687 RSI: 0000000000000002 RDI: 00007f7829478961
RBP: 00007f7829478909 R08: 0000000000000000 R09: 00007f782965c7b8
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f782944d4a0
R13: 00007f782944d478 R14: 00007ffe24b54568 R15: 0000000000000000
 </TASK>
INFO: task syz-executor:4189 blocked for more than 144 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor    state:D stack:21368 pid: 4189 ppid:     1 flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5049 [inline]
 __schedule+0x11ef/0x43c0 kernel/sched/core.c:6395
 schedule+0x11b/0x1e0 kernel/sched/core.c:6478
 exp_funnel_lock kernel/rcu/tree_exp.h:313 [inline]
 synchronize_rcu_expedited+0x680/0x750 kernel/rcu/tree_exp.h:845
 namespace_unlock+0x23f/0x430 fs/namespace.c:1459
 do_umount fs/namespace.c:1683 [inline]
 path_umount+0xf64/0xfd0 fs/namespace.c:1766
 ksys_umount fs/namespace.c:1789 [inline]
 __do_sys_umount fs/namespace.c:1794 [inline]
 __se_sys_umount fs/namespace.c:1792 [inline]
 __x64_sys_umount+0x12d/0x170 fs/namespace.c:1792
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7fb1aedbea57
RSP: 002b:00007ffe6c703448 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: ffffffffffffffda RBX: 00007fb1aee53048 RCX: 00007fb1aedbea57
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffe6c703500
RBP: 00007ffe6c703500 R08: 00007ffe6c704500 R09: 00000000ffffffff
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffe6c704590
R13: 00007fb1aee53048 R14: 000000000000ecf5 R15: 00007ffe6c7045d0
 </TASK>
INFO: task syz-executor:4194 blocked for more than 144 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor    state:D stack:21840 pid: 4194 ppid:     1 flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5049 [inline]
 __schedule+0x11ef/0x43c0 kernel/sched/core.c:6395
 schedule+0x11b/0x1e0 kernel/sched/core.c:6478
 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6537
 __mutex_lock_common+0xcfc/0x2400 kernel/locking/mutex.c:669
 __mutex_lock kernel/locking/mutex.c:729 [inline]
 mutex_lock_nested+0x17/0x20 kernel/locking/mutex.c:743
 exp_funnel_lock kernel/rcu/tree_exp.h:322 [inline]
 synchronize_rcu_expedited+0x3a5/0x750 kernel/rcu/tree_exp.h:845
 namespace_unlock+0x23f/0x430 fs/namespace.c:1459
 do_umount fs/namespace.c:1683 [inline]
 path_umount+0xf64/0xfd0 fs/namespace.c:1766
 ksys_umount fs/namespace.c:1789 [inline]
 __do_sys_umount fs/namespace.c:1794 [inline]
 __se_sys_umount fs/namespace.c:1792 [inline]
 __x64_sys_umount+0x12d/0x170 fs/namespace.c:1792
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7fc12658ea57
RSP: 002b:00007ffcb948fe18 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: ffffffffffffffda RBX: 00007fc1266236d5 RCX: 00007fc12658ea57
RDX: 00007fc12658c687 RSI: 0000000000000002 RDI: 00007fc126623961
RBP: 00007fc126623909 R08: 0000000000000000 R09: 00007fc1268077b8
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fc1265f84a0
R13: 00007fc1265f8478 R14: 00007ffcb9490088 R15: 0000000000000000
 </TASK>
INFO: task kworker/u4:5:4250 blocked for more than 145 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/u4:5    state:D stack:25072 pid: 4250 ppid:     2 flags:0x00004000
Workqueue: events_unbound fsnotify_mark_destroy_workfn
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5049 [inline]
 __schedule+0x11ef/0x43c0 kernel/sched/core.c:6395
 schedule+0x11b/0x1e0 kernel/sched/core.c:6478
 schedule_timeout+0xbd/0x2d0 kernel/time/timer.c:2093
 do_wait_for_common+0x2a2/0x450 kernel/sched/completion.c:85
 __wait_for_common kernel/sched/completion.c:106 [inline]
 wait_for_common kernel/sched/completion.c:117 [inline]
 wait_for_completion+0x48/0x60 kernel/sched/completion.c:138
 __synchronize_srcu+0x2bb/0x350 kernel/rcu/srcutree.c:930
 fsnotify_mark_destroy_workfn+0x106/0x2f0 fs/notify/mark.c:924
 process_one_work+0x85f/0x1010 kernel/workqueue.c:2310
 worker_thread+0xaa6/0x1290 kernel/workqueue.c:2457
 kthread+0x436/0x520 kernel/kthread.c:334
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
 </TASK>
INFO: task dhcpcd:4277 blocked for more than 145 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:dhcpcd          state:D stack:28368 pid: 4277 ppid:  3853 flags:0x00004002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5049 [inline]
 __schedule+0x11ef/0x43c0 kernel/sched/core.c:6395
 schedule+0x11b/0x1e0 kernel/sched/core.c:6478
 exp_funnel_lock kernel/rcu/tree_exp.h:313 [inline]
 synchronize_rcu_expedited+0x680/0x750 kernel/rcu/tree_exp.h:845
 synchronize_rcu+0x119/0x1e0 kernel/rcu/tree.c:3802
 __unregister_prot_hook+0x3f7/0x570 net/packet/af_packet.c:347
 packet_do_bind+0x50a/0xda0 net/packet/af_packet.c:3252
 __sys_bind+0x2e9/0x3e0 net/socket.c:1729
 __do_sys_bind net/socket.c:1740 [inline]
 __se_sys_bind net/socket.c:1738 [inline]
 __x64_sys_bind+0x76/0x80 net/socket.c:1738
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f79090192d7
RSP: 002b:00007fff9de652c8 EFLAGS: 00000213 ORIG_RAX: 0000000000000031
RAX: ffffffffffffffda RBX: 000055de5b2e5e10 RCX: 00007f79090192d7
RDX: 0000000000000014 RSI: 00007fff9de652e0 RDI: 0000000000000003
RBP: 000055de29e164b0 R08: 00007f79090e8ac0 R09: 0000000000000000
R10: 0000000000000003 R11: 0000000000000213 R12: 0000000000000000
R13: 000055de5b2defe0 R14: 0000000000000000 R15: 000055de29e2bac0
 </TASK>
INFO: task dhcpcd:4278 blocked for more than 145 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:dhcpcd          state:D stack:28368 pid: 4278 ppid:  3853 flags:0x00004002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5049 [inline]
 __schedule+0x11ef/0x43c0 kernel/sched/core.c:6395
 schedule+0x11b/0x1e0 kernel/sched/core.c:6478
 exp_funnel_lock kernel/rcu/tree_exp.h:313 [inline]
 synchronize_rcu_expedited+0x680/0x750 kernel/rcu/tree_exp.h:845
 synchronize_rcu+0x119/0x1e0 kernel/rcu/tree.c:3802
 __unregister_prot_hook+0x3f7/0x570 net/packet/af_packet.c:347
 packet_do_bind+0x50a/0xda0 net/packet/af_packet.c:3252
 __sys_bind+0x2e9/0x3e0 net/socket.c:1729
 __do_sys_bind net/socket.c:1740 [inline]
 __se_sys_bind net/socket.c:1738 [inline]
 __x64_sys_bind+0x76/0x80 net/socket.c:1738
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f79090192d7
RSP: 002b:00007fff9de652c8 EFLAGS: 00000213 ORIG_RAX: 0000000000000031
RAX: ffffffffffffffda RBX: 000055de5b2e5e10 RCX: 00007f79090192d7
RDX: 0000000000000014 RSI: 00007fff9de652e0 RDI: 0000000000000003
RBP: 000055de29e164b0 R08: 00007f79090e8ac0 R09: 0000000000000000
R10: 0000000000000003 R11: 0000000000000213 R12: 0000000000000000
R13: 000055de5b2e5370 R14: 0000000000000000 R15: 000055de29e2bac0
 </TASK>
INFO: task dhcpcd:4279 blocked for more than 146 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:dhcpcd          state:D stack:28368 pid: 4279 ppid:  3853 flags:0x00004002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5049 [inline]
 __schedule+0x11ef/0x43c0 kernel/sched/core.c:6395
 schedule+0x11b/0x1e0 kernel/sched/core.c:6478
 exp_funnel_lock kernel/rcu/tree_exp.h:313 [inline]
 synchronize_rcu_expedited+0x680/0x750 kernel/rcu/tree_exp.h:845
 synchronize_rcu+0x119/0x1e0 kernel/rcu/tree.c:3802
 __unregister_prot_hook+0x3f7/0x570 net/packet/af_packet.c:347
 packet_do_bind+0x50a/0xda0 net/packet/af_packet.c:3252
 __sys_bind+0x2e9/0x3e0 net/socket.c:1729
 __do_sys_bind net/socket.c:1740 [inline]
 __se_sys_bind net/socket.c:1738 [inline]
 __x64_sys_bind+0x76/0x80 net/socket.c:1738
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f79090192d7
RSP: 002b:00007fff9de652c8 EFLAGS: 00000213 ORIG_RAX: 0000000000000031
RAX: ffffffffffffffda RBX: 000055de5b2e5e10 RCX: 00007f79090192d7
RDX: 0000000000000014 RSI: 00007fff9de652e0 RDI: 0000000000000003
RBP: 000055de29e164b0 R08: 00007f79090e8ac0 R09: 0000000000000000
R10: 0000000000000003 R11: 0000000000000213 R12: 0000000000000000
R13: 000055de5b2df1b0 R14: 0000000000000000 R15: 000055de29e2bac0
 </TASK>
INFO: task dhcpcd:4280 blocked for more than 146 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:dhcpcd          state:D stack:28368 pid: 4280 ppid:  3853 flags:0x00004002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5049 [inline]
 __schedule+0x11ef/0x43c0 kernel/sched/core.c:6395
 schedule+0x11b/0x1e0 kernel/sched/core.c:6478
 exp_funnel_lock kernel/rcu/tree_exp.h:313 [inline]
 synchronize_rcu_expedited+0x680/0x750 kernel/rcu/tree_exp.h:845
 synchronize_rcu+0x119/0x1e0 kernel/rcu/tree.c:3802
 __unregister_prot_hook+0x3f7/0x570 net/packet/af_packet.c:347
 packet_do_bind+0x50a/0xda0 net/packet/af_packet.c:3252
 __sys_bind+0x2e9/0x3e0 net/socket.c:1729
 __do_sys_bind net/socket.c:1740 [inline]
 __se_sys_bind net/socket.c:1738 [inline]
 __x64_sys_bind+0x76/0x80 net/socket.c:1738
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f79090192d7
RSP: 002b:00007fff9de652c8 EFLAGS: 00000213 ORIG_RAX: 0000000000000031
RAX: ffffffffffffffda RBX: 000055de5b2e5e10 RCX: 00007f79090192d7
RDX: 0000000000000014 RSI: 00007fff9de652e0 RDI: 0000000000000003
RBP: 000055de29e164b0 R08: 00007f79090e8ac0 R09: 0000000000000000
R10: 0000000000000003 R11: 0000000000000213 R12: 0000000000000000
R13: 000055de5b2df380 R14: 0000000000000000 R15: 000055de29e2bac0
 </TASK>

Showing all locks held in the system:
3 locks held by kworker/0:0/7:
 #0: ffff888016c70938 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x761/0x1010 kernel/workqueue.c:-1
 #1: ffffc90000cc7d00 ((work_completion)(&fw_work->work)){+.+.}-{0:0}, at: process_one_work+0x79f/0x1010 kernel/workqueue.c:2285
 #2: ffffffff8d43cb48 (rtnl_mutex){+.+.}-{3:3}, at: regdb_fw_cb+0x79/0x1b0 net/wireless/reg.c:1053
3 locks held by kworker/u4:0/9:
 #0: ffff8880b913a358 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x26/0x140 kernel/sched/core.c:475
 #1: ffff8880b9127888 (&per_cpu_ptr(group->pcpu, cpu)->seq){-.-.}-{0:0}, at: psi_task_switch+0x4fe/0x7d0 kernel/sched/psi.c:891
 #2: ffff8880b91280d8 (&base->lock){-.-.}-{2:2}, at: lock_timer_base+0x123/0x270 kernel/time/timer.c:946
3 locks held by kworker/0:1/13:
 #0: ffff88814bf99138 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work+0x761/0x1010 kernel/workqueue.c:-1
 #1: ffffc90000d27d00 ((addr_chk_work).work){+.+.}-{0:0}, at: process_one_work+0x79f/0x1010 kernel/workqueue.c:2285
 #2: ffffffff8d43cb48 (rtnl_mutex){+.+.}-{3:3}, at: addrconf_verify_work+0xa/0x20 net/ipv6/addrconf.c:4654
3 locks held by kworker/1:1/23:
1 lock held by khungtaskd/27:
 #0: ffffffff8c31eaa0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x0/0x30
3 locks held by kworker/u4:2/154:
 #0: ffff888016c79138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x761/0x1010 kernel/workqueue.c:-1
 #1: ffffc90002027d00 ((linkwatch_work).work){+.+.}-{0:0}, at: process_one_work+0x79f/0x1010 kernel/workqueue.c:2285
 #2: ffffffff8d43cb48 (rtnl_mutex){+.+.}-{3:3}, at: linkwatch_event+0xa/0x50 net/core/link_watch.c:251
2 locks held by kworker/u4:3/1171:
 #0: ffff888016c79138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x761/0x1010 kernel/workqueue.c:-1
 #1: ffffc90004ff7d00 (connector_reaper_work){+.+.}-{0:0}, at: process_one_work+0x79f/0x1010 kernel/workqueue.c:2285
2 locks held by getty/3947:
 #0: ffff88802d2e2098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x21/0x70 drivers/tty/tty_ldisc.c:252
 #1: ffffc900025e62e8 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x5df/0x1a70 drivers/tty/n_tty.c:2158
3 locks held by kworker/0:3/4171:
 #0: ffff888016c71938 ((wq_completion)events_power_efficient){+.+.}-{0:0}, at: process_one_work+0x761/0x1010 kernel/workqueue.c:-1
 #1: ffffc90002e7fd00 ((reg_check_chans).work){+.+.}-{0:0}, at: process_one_work+0x79f/0x1010 kernel/workqueue.c:2285
 #2: ffffffff8d43cb48 (rtnl_mutex){+.+.}-{3:3}, at: reg_check_chans_work+0x82/0xa80 net/wireless/reg.c:2437
1 lock held by syz-executor/4186:
 #0: ffffffff8c323528 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:290 [inline]
 #0: ffffffff8c323528 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x2d1/0x750 kernel/rcu/tree_exp.h:845
1 lock held by syz-executor/4194:
 #0: ffffffff8c323528 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:322 [inline]
 #0: ffffffff8c323528 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x3a5/0x750 kernel/rcu/tree_exp.h:845
2 locks held by kworker/u4:5/4250:
 #0: ffff888016c79138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x761/0x1010 kernel/workqueue.c:-1
 #1: ffffc9000364fd00 ((reaper_work).work){+.+.}-{0:0}, at: process_one_work+0x79f/0x1010 kernel/workqueue.c:2285
1 lock held by dhcpcd/4277:
 #0: ffff88807e1cc120 (sk_lock-AF_PACKET){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1744 [inline]
 #0: ffff88807e1cc120 (sk_lock-AF_PACKET){+.+.}-{0:0}, at: packet_do_bind+0x35/0xda0 net/packet/af_packet.c:3212
1 lock held by dhcpcd/4278:
 #0: ffff88807e5ee120 (sk_lock-AF_PACKET){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1744 [inline]
 #0: ffff88807e5ee120 (sk_lock-AF_PACKET){+.+.}-{0:0}, at: packet_do_bind+0x35/0xda0 net/packet/af_packet.c:3212
1 lock held by dhcpcd/4279:
 #0: ffff88807e2e0120 (sk_lock-AF_PACKET){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1744 [inline]
 #0: ffff88807e2e0120 (sk_lock-AF_PACKET){+.+.}-{0:0}, at: packet_do_bind+0x35/0xda0 net/packet/af_packet.c:3212
1 lock held by dhcpcd/4280:
 #0: ffff88805f106120 (sk_lock-AF_PACKET){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1744 [inline]
 #0: ffff88805f106120 (sk_lock-AF_PACKET){+.+.}-{0:0}, at: packet_do_bind+0x35/0xda0 net/packet/af_packet.c:3212
1 lock held by dhcpcd/4281:
 #0: ffff88807e2fc120 (sk_lock-AF_PACKET){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1744 [inline]
 #0: ffff88807e2fc120 (sk_lock-AF_PACKET){+.+.}-{0:0}, at: packet_do_bind+0x35/0xda0 net/packet/af_packet.c:3212
1 lock held by dhcpcd/4282:
 #0: ffff88807d574120 (sk_lock-AF_PACKET){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1744 [inline]
 #0: ffff88807d574120 (sk_lock-AF_PACKET){+.+.}-{0:0}, at: packet_do_bind+0x35/0xda0 net/packet/af_packet.c:3212
1 lock held by syz-executor/4285:
 #0: ffffffff8d43cb48 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:72 [inline]
 #0: ffffffff8d43cb48 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x7ee/0xf30 net/core/rtnetlink.c:5681
1 lock held by syz-executor/4295:
 #0: ffffffff8d43cb48 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:72 [inline]
 #0: ffffffff8d43cb48 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x7ee/0xf30 net/core/rtnetlink.c:5681
1 lock held by syz-executor/4302:
 #0: ffffffff8d43cb48 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:72 [inline]
 #0: ffffffff8d43cb48 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x7ee/0xf30 net/core/rtnetlink.c:5681
1 lock held by syz-executor/4301:
 #0: ffffffff8d43cb48 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:72 [inline]
 #0: ffffffff8d43cb48 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x7ee/0xf30 net/core/rtnetlink.c:5681
1 lock held by syz-executor/4306:
 #0: ffffffff8d43cb48 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:72 [inline]
 #0: ffffffff8d43cb48 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x7ee/0xf30 net/core/rtnetlink.c:5681
1 lock held by syz-executor/4311:
 #0: ffffffff8d43cb48 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:72 [inline]
 #0: ffffffff8d43cb48 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x7ee/0xf30 net/core/rtnetlink.c:5681
1 lock held by syz-executor/4317:
 #0: ffffffff8d43cb48 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:72 [inline]
 #0: ffffffff8d43cb48 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x7ee/0xf30 net/core/rtnetlink.c:5681
1 lock held by syz-executor/4322:
 #0: ffffffff8d43cb48 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:72 [inline]
 #0: ffffffff8d43cb48 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x7ee/0xf30 net/core/rtnetlink.c:5681
1 lock held by syz-executor/4323:
 #0: ffffffff8d43cb48 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:72 [inline]
 #0: ffffffff8d43cb48 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x7ee/0xf30 net/core/rtnetlink.c:5681
1 lock held by syz-executor/4325:
 #0: ffffffff8d43cb48 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:72 [inline]
 #0: ffffffff8d43cb48 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x7ee/0xf30 net/core/rtnetlink.c:5681
1 lock held by syz-executor/4336:
 #0: ffffffff8d43cb48 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:72 [inline]
 #0: ffffffff8d43cb48 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x7ee/0xf30 net/core/rtnetlink.c:5681
1 lock held by syz-executor/4340:
 #0: ffffffff8d43cb48 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:72 [inline]
 #0: ffffffff8d43cb48 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x7ee/0xf30 net/core/rtnetlink.c:5681

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

NMI backtrace for cpu 0
CPU: 0 PID: 27 Comm: khungtaskd Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026
Call Trace:
 <TASK>
 dump_stack_lvl+0x188/0x250 lib/dump_stack.c:106
 nmi_cpu_backtrace+0x3a2/0x3d0 lib/nmi_backtrace.c:111
 nmi_trigger_cpumask_backtrace+0x163/0x280 lib/nmi_backtrace.c:62
 trigger_all_cpu_backtrace include/linux/nmi.h:148 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:212 [inline]
 watchdog+0xe0f/0xe50 kernel/hung_task.c:369
 kthread+0x436/0x520 kernel/kthread.c:334
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
 </TASK>
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 4334 Comm: kworker/u4:7 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026
Workqueue: bat_events batadv_nc_worker
RIP: 0010:hlock_class kernel/locking/lockdep.c:197 [inline]
RIP: 0010:mark_lock+0x9c/0x320 kernel/locking/lockdep.c:4569
Code: 89 c7 41 81 e7 ff 1f 00 00 c1 e8 03 25 f8 03 00 00 48 8d b8 c0 40 1d 90 be 08 00 00 00 e8 bc 74 60 00 4c 0f a3 3d 74 87 bf 0e <73> 10 4b 8d 04 7f c1 e0 06 4c 8d b8 80 bf b5 8f eb 24 48 c7 c0 80
RSP: 0018:ffffc9000382f980 EFLAGS: 00000057
RAX: 0000000000000001 RBX: ffff88802a803b80 RCX: ffffffff815db944
RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffffffff901d41b0
RBP: 0000000000000002 R08: ffffffff901d41b7 R09: 1ffffffff203a836
R10: dffffc0000000000 R11: fffffbfff203a837 R12: 0000000000000004
R13: dffffc0000000000 R14: ffff88802a804670 R15: 0000000000000783
FS:  0000000000000000(0000) GS:ffff8880b9100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055879e88e000 CR3: 000000001ec72000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 mark_held_locks kernel/locking/lockdep.c:4193 [inline]
 __trace_hardirqs_on_caller kernel/locking/lockdep.c:4211 [inline]
 lockdep_hardirqs_on_prepare+0x249/0x770 kernel/locking/lockdep.c:4278
 trace_hardirqs_on+0x67/0x80 kernel/trace/trace_preemptirq.c:49
 __local_bh_enable_ip+0x136/0x1c0 kernel/softirq.c:406
 spin_unlock_bh include/linux/spinlock.h:409 [inline]
 batadv_nc_purge_paths+0x316/0x3b0 net/batman-adv/network-coding.c:475
 batadv_nc_worker+0x2e7/0x5c0 net/batman-adv/network-coding.c:724
 process_one_work+0x85f/0x1010 kernel/workqueue.c:2310
 worker_thread+0xaa6/0x1290 kernel/workqueue.c:2457
 kthread+0x436/0x520 kernel/kthread.c:334
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
 </TASK>