INFO: task kworker/0:0:7 blocked for more than 143 seconds.
      Not tainted 6.4.0-rc4-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/0:0     state:D stack:12760 pid:7     ppid:2      flags:0x00004000
Workqueue: ipv6_addrconf addrconf_dad_work
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5343 [inline]
 __schedule+0x6f3/0x1440 kernel/sched/core.c:6669
 schedule+0x68/0xc0 kernel/sched/core.c:6745
 schedule_preempt_disabled+0x32/0x60 kernel/sched/core.c:6804
 __mutex_lock_common kernel/locking/mutex.c:679 [inline]
 __mutex_lock+0x449/0x970 kernel/locking/mutex.c:747
 addrconf_dad_work+0x51/0x8b0 net/ipv6/addrconf.c:4088
 process_one_work+0x319/0x740 kernel/workqueue.c:2405
 worker_thread+0x328/0x580 kernel/workqueue.c:2552
 kthread+0x113/0x140 kernel/kthread.c:379
 ret_from_fork+0x29/0x50 arch/x86/entry/entry_64.S:308
 </TASK>
INFO: task kworker/1:2:770 blocked for more than 144 seconds.
      Not tainted 6.4.0-rc4-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/1:2     state:D stack:12248 pid:770   ppid:2      flags:0x00004000
Workqueue: ipv6_addrconf addrconf_dad_work
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5343 [inline]
 __schedule+0x6f3/0x1440 kernel/sched/core.c:6669
 schedule+0x68/0xc0 kernel/sched/core.c:6745
 schedule_preempt_disabled+0x32/0x60 kernel/sched/core.c:6804
 __mutex_lock_common kernel/locking/mutex.c:679 [inline]
 __mutex_lock+0x449/0x970 kernel/locking/mutex.c:747
 addrconf_dad_work+0x51/0x8b0 net/ipv6/addrconf.c:4088
 process_one_work+0x319/0x740 kernel/workqueue.c:2405
 worker_thread+0x328/0x580 kernel/workqueue.c:2552
 kthread+0x113/0x140 kernel/kthread.c:379
 ret_from_fork+0x29/0x50 arch/x86/entry/entry_64.S:308
 </TASK>
INFO: task kworker/0:2:925 blocked for more than 144 seconds.
      Not tainted 6.4.0-rc4-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/0:2     state:D stack:14728 pid:925   ppid:2      flags:0x00004000
Workqueue: events linkwatch_event
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5343 [inline]
 __schedule+0x6f3/0x1440 kernel/sched/core.c:6669
 schedule+0x68/0xc0 kernel/sched/core.c:6745
 schedule_preempt_disabled+0x32/0x60 kernel/sched/core.c:6804
 __mutex_lock_common kernel/locking/mutex.c:679 [inline]
 __mutex_lock+0x449/0x970 kernel/locking/mutex.c:747
 linkwatch_event+0xe/0x30 net/core/link_watch.c:277
 process_one_work+0x319/0x740 kernel/workqueue.c:2405
 worker_thread+0x328/0x580 kernel/workqueue.c:2552
 kthread+0x113/0x140 kernel/kthread.c:379
 ret_from_fork+0x29/0x50 arch/x86/entry/entry_64.S:308
 </TASK>
INFO: task dhcpcd:3824 blocked for more than 145 seconds.
      Not tainted 6.4.0-rc4-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:dhcpcd          state:D stack:12712 pid:3824  ppid:1      flags:0x00004002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5343 [inline]
 __schedule+0x6f3/0x1440 kernel/sched/core.c:6669
 schedule+0x68/0xc0 kernel/sched/core.c:6745
 schedule_preempt_disabled+0x32/0x60 kernel/sched/core.c:6804
 __mutex_lock_common kernel/locking/mutex.c:679 [inline]
 __mutex_lock+0x449/0x970 kernel/locking/mutex.c:747
 __netlink_dump_start+0x87/0x380 net/netlink/af_netlink.c:2337
 netlink_dump_start include/linux/netlink.h:329 [inline]
 rtnetlink_rcv_msg+0x598/0x750 net/core/rtnetlink.c:6351
 netlink_rcv_skb+0xe8/0x1c0 net/netlink/af_netlink.c:2546
 netlink_unicast_kernel net/netlink/af_netlink.c:1339 [inline]
 netlink_unicast+0x473/0x540 net/netlink/af_netlink.c:1365
 netlink_sendmsg+0x583/0x670 net/netlink/af_netlink.c:1913
 sock_sendmsg_nosec net/socket.c:724 [inline]
 sock_sendmsg+0xc7/0xf0 net/socket.c:747
 ____sys_sendmsg+0x269/0x350 net/socket.c:2503
 ___sys_sendmsg+0x2f0/0x330 net/socket.c:2557
 __sys_sendmsg net/socket.c:2586 [inline]
 __do_sys_sendmsg net/socket.c:2595 [inline]
 __se_sys_sendmsg+0x142/0x1c0 net/socket.c:2593
 do_syscall_64+0x46/0xc0
 entry_SYSCALL_64_after_hwframe+0x73/0xdd
RIP: 0033:0x7f3cf90a6a4b
RSP: 002b:00007ffdce6a6dd8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 000055e2eeab777c RCX: 00007f3cf90a6a4b
RDX: 0000000000000000 RSI: 00007ffdce6a6e20 RDI: 000000000000000f
RBP: 00007ffdce6bb3c8 R08: 00007ffdce6ab028 R09: 00007ffdce6ab028
R10: 000055e2eead515e R11: 0000000000000246 R12: 000000000000000f
R13: 00007ffdce6ab028 R14: 00007ffdce6ab008 R15: 00007ffdce6ab208
 </TASK>
INFO: task kworker/0:6:4443 blocked for more than 146 seconds.
      Not tainted 6.4.0-rc4-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/0:6     state:D stack:12328 pid:4443  ppid:2      flags:0x00004000
Workqueue: events switchdev_deferred_process_work
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5343 [inline]
 __schedule+0x6f3/0x1440 kernel/sched/core.c:6669
 schedule+0x68/0xc0 kernel/sched/core.c:6745
 schedule_preempt_disabled+0x32/0x60 kernel/sched/core.c:6804
 __mutex_lock_common kernel/locking/mutex.c:679 [inline]
 __mutex_lock+0x449/0x970 kernel/locking/mutex.c:747
 switchdev_deferred_process_work+0xe/0x20 net/switchdev/switchdev.c:75
 process_one_work+0x319/0x740 kernel/workqueue.c:2405
 worker_thread+0x328/0x580 kernel/workqueue.c:2552
 kthread+0x113/0x140 kernel/kthread.c:379
 ret_from_fork+0x29/0x50 arch/x86/entry/entry_64.S:308
 </TASK>

Showing all locks held in the system:
3 locks held by kworker/0:0/7:
 #0: ffff8881453bcf38 ((wq_completion)ipv6_addrconf){....}-{0:0}, at: process_one_work+0x26a/0x740 kernel/workqueue.c:2378
 #1: ffffc9000008be60 ((work_completion)(&(&ifa->dad_work)->work)){....}-{0:0}, at: process_one_work+0x294/0x740 kernel/workqueue.c:2380
 #2: ffffffff85ab1d58 (rtnl_mutex){....}-{3:3}, at: addrconf_dad_work+0x51/0x8b0 net/ipv6/addrconf.c:4088
4 locks held by kworker/u4:1/12:
1 lock held by rcu_tasks_kthre/13:
 #0: ffffffff857adf98 (rcu_tasks.tasks_gp_mutex){....}-{3:3}, at: rcu_tasks_one_gp kernel/rcu/tasks.h:518 [inline]
 #0: ffffffff857adf98 (rcu_tasks.tasks_gp_mutex){....}-{3:3}, at: rcu_tasks_kthread+0x9c/0x460 kernel/rcu/tasks.h:563
1 lock held by rcu_tasks_trace/14:
 #0: ffffffff857ae278 (rcu_tasks_trace.tasks_gp_mutex){....}-{3:3}, at: rcu_tasks_one_gp kernel/rcu/tasks.h:518 [inline]
 #0: ffffffff857ae278 (rcu_tasks_trace.tasks_gp_mutex){....}-{3:3}, at: rcu_tasks_kthread+0x9c/0x460 kernel/rcu/tasks.h:563
1 lock held by khungtaskd/28:
 #0: ffffffff857ade70 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x0/0x30 arch/x86/kernel/nmi.c:311
3 locks held by kworker/u4:2/36:
6 locks held by kworker/u4:3/49:
3 locks held by kworker/u4:4/69:
3 locks held by kworker/1:2/770:
 #0: ffff8881453bcf38 ((wq_completion)ipv6_addrconf){....}-{0:0}, at: process_one_work+0x26a/0x740 kernel/workqueue.c:2378
 #1: ffffc900035afe60 ((work_completion)(&(&ifa->dad_work)->work)){....}-{0:0}, at: process_one_work+0x294/0x740 kernel/workqueue.c:2380
 #2: ffffffff85ab1d58 (rtnl_mutex){....}-{3:3}, at: addrconf_dad_work+0x51/0x8b0 net/ipv6/addrconf.c:4088
3 locks held by kworker/0:2/925:
 #0: ffff888100070738 ((wq_completion)events){....}-{0:0}, at: process_one_work+0x26a/0x740 kernel/workqueue.c:2378
 #1: ffffc900037cfe60 ((linkwatch_work).work){....}-{0:0}, at: process_one_work+0x294/0x740 kernel/workqueue.c:2380
 #2: ffffffff85ab1d58 (rtnl_mutex){....}-{3:3}, at: linkwatch_event+0xe/0x30 net/core/link_watch.c:277
3 locks held by kworker/0:3/2100:
1 lock held by dhcpcd/3824:
 #0: ffffffff85ab1d58 (rtnl_mutex){....}-{3:3}, at: __netlink_dump_start+0x87/0x380 net/netlink/af_netlink.c:2337
2 locks held by getty/3883:
 #0: ffff88810cd44098 (&tty->ldisc_sem){....}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x50 drivers/tty/tty_ldisc.c:243
 #1: ffffc9000ac2b2f0 (&ldata->atomic_read_lock){....}-{3:3}, at: n_tty_read+0x319/0xf00 drivers/tty/n_tty.c:2176
3 locks held by kworker/1:9/4082:
 #0: ffff888100070f38 ((wq_completion)events_power_efficient){....}-{0:0}, at: process_one_work+0x26a/0x740 kernel/workqueue.c:2378
 #1: ffffc90002affe60 ((reg_check_chans).work){....}-{0:0}, at: process_one_work+0x294/0x740 kernel/workqueue.c:2380
 #2: ffffffff85ab1d58 (rtnl_mutex){....}-{3:3}, at: reg_check_chans_work+0x37/0x7a0 net/wireless/reg.c:2455
3 locks held by kworker/0:4/4155:
3 locks held by kworker/0:6/4443:
 #0: ffff888100070738 ((wq_completion)events){....}-{0:0}, at: process_one_work+0x26a/0x740 kernel/workqueue.c:2378
 #1: ffffc90000bcfe60 (deferred_process_work){....}-{0:0}, at: process_one_work+0x294/0x740 kernel/workqueue.c:2380
 #2: ffffffff85ab1d58 (rtnl_mutex){....}-{3:3}, at: switchdev_deferred_process_work+0xe/0x20 net/switchdev/switchdev.c:75
1 lock held by syz-executor/5368:
3 locks held by kworker/u4:7/5664:

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

NMI backtrace for cpu 1
CPU: 1 PID: 28 Comm: khungtaskd Not tainted 6.4.0-rc4-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xf4/0x180 lib/dump_stack.c:106
 nmi_cpu_backtrace+0x234/0x250 lib/nmi_backtrace.c:113
 nmi_trigger_cpumask_backtrace+0xf2/0x210 lib/nmi_backtrace.c:62
 trigger_all_cpu_backtrace include/linux/nmi.h:148 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:222 [inline]
 watchdog+0x81f/0x860 kernel/hung_task.c:379
 kthread+0x113/0x140 kernel/kthread.c:379
 ret_from_fork+0x29/0x50 arch/x86/entry/entry_64.S:308
 </TASK>
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 15 Comm: ksoftirqd/0 Not tainted 6.4.0-rc4-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
RIP: 0010:orc_ip arch/x86/kernel/unwind_orc.c:30 [inline]
RIP: 0010:__orc_find arch/x86/kernel/unwind_orc.c:52 [inline]
RIP: 0010:orc_find arch/x86/kernel/unwind_orc.c:192 [inline]
RIP: 0010:unwind_next_frame+0x168/0xac0 arch/x86/kernel/unwind_orc.c:466
Code: 4e 04 49 89 c0 48 39 ee 77 32 48 89 e9 48 29 f1 48 89 c8 48 c1 f8 02 48 c1 e9 3f 48 01 c1 48 83 e1 fe 48 8d 04 4e 48 63 3c 4e <48> 01 c7 48 39 df 76 cb 48 8d 6c 4e fc 48 39 ee 76 ce 49 29 d0 e9
RSP: 0018:ffffc900000cb460 EFLAGS: 00000202
RAX: ffffffff860aa674 RBX: ffffffff8391f283 RCX: 0000000000000002
RDX: ffffffff860aa670 RSI: ffffffff860aa670 RDI: fffffffffd874c09
RBP: ffffffff860aa67c R08: ffffffff860aa670 R09: ffffffff867a1c24
R10: ffff88811edc04a0 R11: ffffffff812feed0 R12: ffffffff8391f284
R13: 0000000000000001 R14: ffffffff846252c8 R15: ffffc900000cb4a8
FS:  0000000000000000(0000) GS:ffff88813bc00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffbcc2cad58 CR3: 0000000005678000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <NMI>
 </NMI>
 <TASK>
 arch_stack_walk+0x11b/0x150 arch/x86/kernel/stacktrace.c:25
 stack_trace_save+0x46/0x70 kernel/stacktrace.c:122
 ref_tracker_alloc+0x148/0x2c0 lib/ref_tracker.c:91
 __netdev_tracker_alloc include/linux/netdevice.h:4070 [inline]
 netdev_hold include/linux/netdevice.h:4099 [inline]
 dst_init+0xac/0x1c0 net/core/dst.c:52
 dst_alloc+0xc1/0xe0 net/core/dst.c:93
 rt_dst_alloc net/ipv4/route.c:1633 [inline]
 __mkroute_output net/ipv4/route.c:2590 [inline]
 ip_route_output_key_hash_rcu+0x8e2/0xe10 net/ipv4/route.c:2812
 ip_route_output_key_hash net/ipv4/route.c:2641 [inline]
 __ip_route_output_key include/net/route.h:134 [inline]
 ip_route_output_flow+0xaf/0x140 net/ipv4/route.c:2869
 ip_route_output_key include/net/route.h:150 [inline]
 ip_route_me_harder+0x372/0x6b0 net/ipv4/netfilter.c:52
 synproxy_send_tcp+0x178/0x240 net/netfilter/nf_synproxy_core.c:431
 synproxy_send_client_synack+0x304/0x330 net/netfilter/nf_synproxy_core.c:484
 nft_synproxy_eval_v4+0x184/0x1d0 net/netfilter/nft_synproxy.c:59
 nft_synproxy_do_eval+0x170/0x370 net/netfilter/nft_synproxy.c:141
 expr_call_ops_eval net/netfilter/nf_tables_core.c:240 [inline]
 nft_do_chain+0x28a/0xab0 net/netfilter/nf_tables_core.c:288
 nft_do_chain_inet+0x144/0x170 net/netfilter/nft_chain_filter.c:161
 nf_hook_entry_hookfn include/linux/netfilter.h:143 [inline]
 nf_hook_slow+0x54/0x140 net/netfilter/core.c:626
 nf_hook include/linux/netfilter.h:258 [inline]
 NF_HOOK include/linux/netfilter.h:301 [inline]
 ip_local_deliver+0x12e/0x170 net/ipv4/ip_input.c:254
 NF_HOOK include/linux/netfilter.h:303 [inline]
 ip_rcv+0x55/0x130 net/ipv4/ip_input.c:569
 __netif_receive_skb_one_core net/core/dev.c:5491 [inline]
 __netif_receive_skb+0xe4/0x210 net/core/dev.c:5605
 process_backlog+0x13a/0x210 net/core/dev.c:5933
 __napi_poll+0x44/0x320 net/core/dev.c:6496
 napi_poll net/core/dev.c:6563 [inline]
 net_rx_action+0x1f7/0x4a0 net/core/dev.c:6696
 __do_softirq+0x102/0x2e1 kernel/softirq.c:553
 run_ksoftirqd+0x23/0x30 kernel/softirq.c:921
 smpboot_thread_fn+0x210/0x390 kernel/smpboot.c:164
 kthread+0x113/0x140 kernel/kthread.c:379
 ret_from_fork+0x29/0x50 arch/x86/entry/entry_64.S:308
 </TASK>