INFO: task syz.2.1760:8658 blocked for more than 430 seconds.
      Not tainted 6.16.0-rc1-syzkaller-gfda589c28604 #0
      Blocked by coredump.
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.2.1760      state:D stack:0     pid:8658  tgid:8658  ppid:5245   task_flags:0x40044c flags:0x0000000c
Call Trace:
[<ffffffff8632f9f0>] context_switch kernel/sched/core.c:5396 [inline]
[<ffffffff8632f9f0>] __schedule+0x1022/0x4094 kernel/sched/core.c:6785
[<ffffffff86332b26>] __schedule_loop kernel/sched/core.c:6863 [inline]
[<ffffffff86332b26>] schedule+0xc4/0x35e kernel/sched/core.c:6878
[<ffffffff863470ba>] schedule_timeout+0x1c6/0x2ae kernel/time/sleep_timeout.c:75
[<ffffffff863346ae>] do_wait_for_common kernel/sched/completion.c:95 [inline]
[<ffffffff863346ae>] __wait_for_common+0x1d2/0x3e8 kernel/sched/completion.c:116
[<ffffffff863348de>] wait_for_common kernel/sched/completion.c:127 [inline]
[<ffffffff863348de>] wait_for_completion+0x1a/0x22 kernel/sched/completion.c:148
[<ffffffff80375b84>] rcu_barrier+0x2dc/0x6cc kernel/rcu/tree.c:3850
[<ffffffff8512e194>] netdev_run_todo+0x294/0x10b4 net/core/dev.c:11376
[<ffffffff8515e36c>] rtnl_unlock+0x14/0x1c net/core/rtnetlink.c:157
[<ffffffff832f516a>] tun_detach drivers/net/tun.c:639 [inline]
[<ffffffff832f516a>] tun_chr_close+0xde/0x230 drivers/net/tun.c:3396
[<ffffffff80bfbe7a>] __fput+0x382/0xa8c fs/file_table.c:465
[<ffffffff80bfc632>] ____fput+0x1c/0x26 fs/file_table.c:493
[<ffffffff801d7c16>] task_work_run+0x16a/0x25e kernel/task_work.c:227
[<ffffffff801563ca>] exit_task_work include/linux/task_work.h:40 [inline]
[<ffffffff801563ca>] do_exit+0x844/0x28ca kernel/exit.c:955
[<ffffffff801589b0>] do_group_exit+0xd4/0x26c kernel/exit.c:1104
[<ffffffff80190b0a>] get_signal+0x207c/0x22fc kernel/signal.c:3034
[<ffffffff80070c0e>] arch_do_signal_or_restart+0x5d8/0x24c6 arch/riscv/kernel/signal.c:431
[<ffffffff803b54e6>] exit_to_user_mode_loop+0x90/0x134 kernel/entry/common.c:111
[<ffffffff86324f5c>] exit_to_user_mode_prepare include/linux/entry-common.h:330 [inline]
[<ffffffff86324f5c>] syscall_exit_to_user_mode_work include/linux/entry-common.h:414 [inline]
[<ffffffff86324f5c>] syscall_exit_to_user_mode include/linux/entry-common.h:449 [inline]
[<ffffffff86324f5c>] do_trap_ecall_u+0x3f0/0x530 arch/riscv/kernel/traps.c:355
[<ffffffff8634d39a>] handle_exception+0x146/0x152 arch/riscv/kernel/entry.S:197

Showing all locks held in the system:
1 lock held by khungtaskd/38:
 #0: ffffffff883dc420 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2a/0x1a0 kernel/locking/lockdep.c:6766
1 lock held by dhcpcd/3050:
 #0: ffffaf806ed3b0d8 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested kernel/sched/core.c:606 [inline]
 #0: ffffaf806ed3b0d8 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock kernel/sched/sched.h:1532 [inline]
 #0: ffffaf806ed3b0d8 (&rq->__lock){-.-.}-{2:2}, at: rq_lock kernel/sched/sched.h:1856 [inline]
 #0: ffffaf806ed3b0d8 (&rq->__lock){-.-.}-{2:2}, at: __schedule+0x304/0x4094 kernel/sched/core.c:6709
2 locks held by getty/3157:
 #0: ffffaf8018ae20a0 (&tty->ldisc_sem){++++}-{0:0}, at: ldsem_down_read+0x3a/0x46 drivers/tty/tty_ldsem.c:340
 #1: ffff8f800008e2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x3e4/0x12b6 drivers/tty/n_tty.c:2222
3 locks held by syz-executor/3188:
1 lock held by syz-executor/3198:
 #0: ffffffff883ec640 (rcu_state.barrier_mutex){+.+.}-{4:4}, at: rcu_barrier+0x56/0x6cc kernel/rcu/tree.c:3782
2 locks held by kworker/0:4/7985:
2 locks held by kworker/1:2/8384:
2 locks held by kworker/u9:6/8419:
5 locks held by kworker/1:1/8642:
3 locks held by kworker/u9:4/8644:
1 lock held by syz.2.1760/8658:
 #0: ffffffff883ec640 (rcu_state.barrier_mutex){+.+.}-{4:4}, at: rcu_barrier+0x56/0x6cc kernel/rcu/tree.c:3782
3 locks held by kworker/1:5/8682:
1 lock held by syz-executor/8683:
 #0: ffffffff883ec640 (rcu_state.barrier_mutex){+.+.}-{4:4}, at: rcu_barrier+0x56/0x6cc kernel/rcu/tree.c:3782
3 locks held by kworker/u9:8/8832:
 #0: ffffaf8011a89148 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x848/0x1f32 kernel/workqueue.c:3213
 #1: ffff8f8006fe7b70 ((linkwatch_work).work){+.+.}-{0:0}, at: process_one_work+0x870/0x1f32 kernel/workqueue.c:3213
 #2: ffffffff8986c1c8 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock+0x22/0x2a net/core/rtnetlink.c:80
1 lock held by syz.0.1789/9068:
 #0: ffffffff883ec640 (rcu_state.barrier_mutex){+.+.}-{4:4}, at: rcu_barrier+0x56/0x6cc kernel/rcu/tree.c:3782
2 locks held by kworker/u9:9/9076:
 #0: ffffaf8011a89148 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x848/0x1f32 kernel/workqueue.c:3213
 #1: ffff8f8005de7b70 ((work_completion)(&sub_info->work)){+.+.}-{0:0}, at: process_one_work+0x870/0x1f32 kernel/workqueue.c:3213
2 locks held by syz-executor/9089:
3 locks held by syz-executor/9095:
 #0: ffffffff890264e0 (&ops->srcu#2){.+.+}-{0:0}, at: rtnl_link_ops_get+0xea/0x31c net/core/rtnetlink.c:573
 #1: ffffffff8986c1c8 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock net/core/rtnetlink.c:80 [inline]
 #1: ffffffff8986c1c8 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_nets_lock net/core/rtnetlink.c:341 [inline]
 #1: ffffffff8986c1c8 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_newlink+0x64c/0x1d78 net/core/rtnetlink.c:4054
 #2: ffffffff883ec778 (rcu_state.exp_mutex){+.+.}-{4:4}, at: exp_funnel_lock+0x26a/0x37e kernel/rcu/tree_exp.h:304
3 locks held by kworker/u9:10/9211:
6 locks held by kworker/u9:9/9333:

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

NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 38 Comm: khungtaskd Not tainted 6.16.0-rc1-syzkaller-gfda589c28604 #0 PREEMPT 
Hardware name: riscv-virtio,qemu (DT)
Call Trace:
[<ffffffff80078bbe>] dump_backtrace+0x2e/0x3c arch/riscv/kernel/stacktrace.c:132
[<ffffffff8000327a>] show_stack+0x30/0x3c arch/riscv/kernel/stacktrace.c:138
[<ffffffff8006103e>] __dump_stack lib/dump_stack.c:94 [inline]
[<ffffffff8006103e>] dump_stack_lvl+0x12e/0x1a6 lib/dump_stack.c:120
[<ffffffff800610d2>] dump_stack+0x1c/0x24 lib/dump_stack.c:129
[<ffffffff862e7634>] nmi_cpu_backtrace+0x3b0/0x3b2 lib/nmi_backtrace.c:113
[<ffffffff862e78ec>] nmi_trigger_cpumask_backtrace+0x2b6/0x458 lib/nmi_backtrace.c:62
[<ffffffff800863dc>] arch_trigger_cpumask_backtrace+0x2c/0x3c arch/riscv/kernel/smp.c:350
[<ffffffff804edb80>] trigger_all_cpu_backtrace include/linux/nmi.h:158 [inline]
[<ffffffff804edb80>] check_hung_uninterruptible_tasks kernel/hung_task.c:307 [inline]
[<ffffffff804edb80>] watchdog+0xcf2/0x11de kernel/hung_task.c:470
[<ffffffff801ddcbc>] kthread+0x39c/0x7d4 kernel/kthread.c:464
[<ffffffff8006977a>] ret_from_fork_kernel+0x2a/0xbb2 arch/riscv/kernel/process.c:214
[<ffffffff8634d4ba>] ret_from_fork_kernel_asm+0x16/0x18 arch/riscv/kernel/entry.S:327
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 9333 Comm: kworker/u9:9 Not tainted 6.16.0-rc1-syzkaller-gfda589c28604 #0 PREEMPT 
Hardware name: riscv-virtio,qemu (DT)
epc : read_pnet include/net/net_namespace.h:409 [inline]
epc : nf_ct_net include/net/netfilter/nf_conntrack.h:160 [inline]
epc : tcp_new+0x34/0x6f4 net/netfilter/nf_conntrack_proto_tcp.c:844
 ra : read_pnet include/net/net_namespace.h:409 [inline]
 ra : nf_ct_net include/net/netfilter/nf_conntrack.h:160 [inline]
 ra : tcp_new+0x34/0x6f4 net/netfilter/nf_conntrack_proto_tcp.c:844
epc : ffffffff85581c94 ra : ffffffff85581c94 sp : ffff8f8000017240
 gp : ffffffff89c83e20 tp : ffffaf8044173480 t0 : ffffaf8044e2bab8
 t1 : 000000000000f2f2 t2 : fffffffff2f20000 s0 : ffff8f80000172b0
 s1 : ffffaf8044e2b980 a0 : 0000000000000001 a1 : ffffaf802c42fdc0
 a2 : 0000000000f00000 a3 : ffffffff85581c8c a4 : 0000000000000000
 a5 : ffffaf8044174480 a6 : 0000000000f00000 a7 : 000000000000f1f1
 s2 : ffffaf8032561314 s3 : ffffaf802c42fdc0 s4 : 0000000000000014
 s5 : ffff8f80000178b0 s6 : ffffaf8032561314 s7 : 0000000000000014
 s8 : 0000000000000002 s9 : 0000000000000006 s10: 0000000000000000
 s11: ffffaf802c42fdc0 t3 : 81987a7b00000000 t4 : fffff5ef089c5730
 t5 : fffff5ef089c5731 t6 : 0000000000000002
status: 0000000200000120 badaddr: 0000000000000000 cause: 8000000000000001
[<ffffffff85581c94>] read_pnet include/net/net_namespace.h:409 [inline]
[<ffffffff85581c94>] nf_ct_net include/net/netfilter/nf_conntrack.h:160 [inline]
[<ffffffff85581c94>] tcp_new+0x34/0x6f4 net/netfilter/nf_conntrack_proto_tcp.c:844
[<ffffffff85582df0>] nf_conntrack_tcp_packet+0x41a/0x6576 net/netfilter/nf_conntrack_proto_tcp.c:986
[<ffffffff8556c276>] nf_conntrack_handle_packet net/netfilter/nf_conntrack_core.c:1964 [inline]
[<ffffffff8556c276>] nf_conntrack_in+0x9e6/0x1c3c net/netfilter/nf_conntrack_core.c:2054
[<ffffffff8557c518>] ipv4_conntrack_in+0x20/0x2e net/netfilter/nf_conntrack_proto.c:207
[<ffffffff8553aab8>] nf_hook_entry_hookfn include/linux/netfilter.h:157 [inline]
[<ffffffff8553aab8>] nf_hook_slow+0xb8/0x1ec net/netfilter/core.c:623
[<ffffffff8575fda6>] nf_hook include/linux/netfilter.h:272 [inline]
[<ffffffff8575fda6>] NF_HOOK include/linux/netfilter.h:315 [inline]
[<ffffffff8575fda6>] ip_rcv+0x20e/0x44e net/ipv4/ip_input.c:567
[<ffffffff8511db78>] __netif_receive_skb_one_core+0x106/0x16e net/core/dev.c:5977
[<ffffffff8511ddf8>] __netif_receive_skb+0x2c/0x144 net/core/dev.c:6090
[<ffffffff8511eff8>] process_backlog+0x4f6/0x1cb0 net/core/dev.c:6442
[<ffffffff85123992>] __napi_poll.constprop.0+0xaa/0x4ba net/core/dev.c:7414
[<ffffffff85124876>] napi_poll net/core/dev.c:7478 [inline]
[<ffffffff85124876>] net_rx_action+0xad4/0xefc net/core/dev.c:7605
[<ffffffff8015e7ae>] handle_softirqs+0x4b2/0x132e kernel/softirq.c:579
[<ffffffff8015f8fa>] __do_softirq kernel/softirq.c:613 [inline]
[<ffffffff8015f8fa>] invoke_softirq kernel/softirq.c:453 [inline]
[<ffffffff8015f8fa>] __irq_exit_rcu+0x18c/0x550 kernel/softirq.c:680
[<ffffffff80161300>] irq_exit_rcu+0x10/0xf8 kernel/softirq.c:696
[<ffffffff863246c4>] handle_riscv_irq+0x40/0x4c arch/riscv/kernel/traps.c:388
[<ffffffff8634d502>] call_on_irq_stack+0x32/0x40 arch/riscv/kernel/entry.S:360