INFO: task syz.3.1223:7721 blocked for more than 430 seconds.
      Not tainted 6.16.0-rc1-syzkaller-g306e57988197 #0
      Blocked by coredump.
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.3.1223      state:D stack:0     pid:7721  tgid:7721  ppid:6923   task_flags:0x40064c flags:0x0000000c
Call Trace:
[<ffffffff86307720>] context_switch kernel/sched/core.c:5396 [inline]
[<ffffffff86307720>] __schedule+0x1022/0x4094 kernel/sched/core.c:6785
[<ffffffff8630a856>] __schedule_loop kernel/sched/core.c:6863 [inline]
[<ffffffff8630a856>] schedule+0xc4/0x35e kernel/sched/core.c:6878
[<ffffffff8631edea>] schedule_timeout+0x1c6/0x2ae kernel/time/sleep_timeout.c:75
[<ffffffff8630c3de>] do_wait_for_common kernel/sched/completion.c:95 [inline]
[<ffffffff8630c3de>] __wait_for_common+0x1d2/0x3e8 kernel/sched/completion.c:116
[<ffffffff8630c60e>] wait_for_common kernel/sched/completion.c:127 [inline]
[<ffffffff8630c60e>] wait_for_completion+0x1a/0x22 kernel/sched/completion.c:148
[<ffffffff80375b84>] rcu_barrier+0x2dc/0x6cc kernel/rcu/tree.c:3850
[<ffffffff85105ec4>] netdev_run_todo+0x294/0x10b4 net/core/dev.c:11376
[<ffffffff8513609c>] 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
[<ffffffff8007073c>] arch_do_signal_or_restart+0x106/0x24c6 arch/riscv/kernel/signal.c:431
[<ffffffff862fdf44>] exit_to_user_mode_loop kernel/entry/common.c:111 [inline]
[<ffffffff862fdf44>] exit_to_user_mode_prepare include/linux/entry-common.h:330 [inline]
[<ffffffff862fdf44>] irqentry_exit_to_user_mode+0x2c6/0x3b6 kernel/entry/common.c:184
[<ffffffff862fe13e>] irqentry_exit+0x10a/0x18c kernel/entry/common.c:287
[<ffffffff862fce0a>] do_page_fault+0x3e/0x56 arch/riscv/kernel/traps.c:376
[<ffffffff863250ca>] 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 klogd/2990:
2 locks held by getty/3138:
 #0: ffffaf8011f9d0a0 (&tty->ldisc_sem){++++}-{0:0}, at: ldsem_down_read+0x3a/0x46 drivers/tty/tty_ldsem.c:340
 #1: ffff8f800008b2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x3e4/0x12b6 drivers/tty/n_tty.c:2222
2 locks held by syz-executor/3166:
4 locks held by syz-executor/3172:
2 locks held by kworker/1:2/3779:
2 locks held by kworker/1:4/3876:
2 locks held by kworker/1:1/6088:
2 locks held by kworker/0:4/6758:
2 locks held by kworker/1:3/7675:
1 lock held by syz.3.1223/7721:
 #0: ffffffff883ec640 (rcu_state.barrier_mutex){+.+.}-{4:4}, at: rcu_barrier+0x56/0x6cc kernel/rcu/tree.c:3782
2 locks held by kworker/u9:2/7737:
2 locks held by kworker/1:5/7843:
2 locks held by kworker/1:10/7860:
8 locks held by syz-executor/7864:
3 locks held by kworker/u9:8/7874:
2 locks held by kworker/1:11/7876:

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

NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 38 Comm: khungtaskd Not tainted 6.16.0-rc1-syzkaller-g306e57988197 #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
[<ffffffff862bf364>] nmi_cpu_backtrace+0x3b0/0x3b2 lib/nmi_backtrace.c:113
[<ffffffff862bf61c>] 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
[<ffffffff863251ea>] 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: 23 Comm: ksoftirqd/1 Not tainted 6.16.0-rc1-syzkaller-g306e57988197 #0 PREEMPT 
Hardware name: riscv-virtio,qemu (DT)
epc : lock_is_held_type+0x144/0x1e6 kernel/locking/lockdep.c:5947
 ra : lockdep_recursion_finish kernel/locking/lockdep.c:473 [inline]
 ra : lock_is_held_type+0x112/0x1e6 kernel/locking/lockdep.c:5944
epc : ffffffff862fd86e ra : ffffffff862fd83c sp : ffff8f8000196910
 gp : ffffffff89c7e9c0 tp : ffffaf80132c4ec0 t0 : ffff8f80001966b0
 t1 : 0000000000000001 t2 : fffffffff2f20000 s0 : ffff8f8000196970
 s1 : ffffffff910373c8 a0 : 0000000000000001 a1 : ffffffff87c1a798
 a2 : 0000000000f00000 a3 : 0000000000000001 a4 : 0000000000000000
 a5 : 0000000000000000 a6 : 0000000000f00000 a7 : ffffffff8574f72e
 s2 : ffffaf806ed47748 s3 : 0000000000000001 s4 : ffffaf80132c5ec0
 s5 : ffffffffffffffff s6 : 0000000000000002 s7 : ffffffff8665e748
 s8 : ffffffff910373c0 s9 : 0000000000000001 s10: 1ffff5f007c95500
 s11: ffffaf803d762498 t3 : 81987a7b00000000 t4 : 0000000000001fff
 t5 : 00000000000000c8 t6 : 0000000000000002
status: 0000000200000120 badaddr: 0000000000000000 cause: 8000000000000001
[<ffffffff862fd86e>] arch_local_irq_restore arch/riscv/include/asm/irqflags.h:51 [inline]
[<ffffffff862fd86e>] lock_is_held_type+0x144/0x1e6 kernel/locking/lockdep.c:5945
[<ffffffff803534b8>] lock_is_held include/linux/lockdep.h:249 [inline]
[<ffffffff803534b8>] rcu_read_lock_held kernel/rcu/update.c:351 [inline]
[<ffffffff803534b8>] rcu_read_lock_held+0x3c/0x4e kernel/rcu/update.c:345
[<ffffffff85750a54>] ___neigh_lookup_noref include/net/neighbour.h:302 [inline]
[<ffffffff85750a54>] __ipv4_neigh_lookup_noref include/net/arp.h:27 [inline]
[<ffffffff85750a54>] ip_neigh_gw4 include/net/route.h:405 [inline]
[<ffffffff85750a54>] ip_neigh_for_gw include/net/route.h:425 [inline]
[<ffffffff85750a54>] ip_finish_output2+0x1770/0x2772 net/ipv4/ip_output.c:229
[<ffffffff85751dce>] __ip_finish_output net/ipv4/ip_output.c:313 [inline]
[<ffffffff85751dce>] __ip_finish_output+0x378/0x60c net/ipv4/ip_output.c:295
[<ffffffff8575209e>] ip_finish_output+0x3c/0x350 net/ipv4/ip_output.c:323
[<ffffffff85752540>] NF_HOOK_COND include/linux/netfilter.h:306 [inline]
[<ffffffff85752540>] ip_output+0x18e/0x61c net/ipv4/ip_output.c:433
[<ffffffff8575362c>] dst_output include/net/dst.h:459 [inline]
[<ffffffff8575362c>] ip_local_out+0xac/0x1a8 net/ipv4/ip_output.c:129
[<ffffffff855d0138>] synproxy_send_tcp.isra.0+0x3de/0x5d2 net/netfilter/nf_synproxy_core.c:439
[<ffffffff855d1f64>] synproxy_send_client_synack+0x6dc/0x8be net/netfilter/nf_synproxy_core.c:484
[<ffffffff856ab89c>] nft_synproxy_eval_v4 net/netfilter/nft_synproxy.c:59 [inline]
[<ffffffff856ab89c>] nft_synproxy_do_eval+0x8ac/0xa52 net/netfilter/nft_synproxy.c:141
[<ffffffff856abaa0>] nft_synproxy_eval+0x28/0x36 net/netfilter/nft_synproxy.c:247
[<ffffffff855dd3ca>] expr_call_ops_eval net/netfilter/nf_tables_core.c:237 [inline]
[<ffffffff855dd3ca>] nft_do_chain+0x328/0x1598 net/netfilter/nf_tables_core.c:285
[<ffffffff85639588>] nft_do_chain_inet+0x180/0x316 net/netfilter/nft_chain_filter.c:161
[<ffffffff855127e8>] nf_hook_entry_hookfn include/linux/netfilter.h:157 [inline]
[<ffffffff855127e8>] nf_hook_slow+0xb8/0x1ec net/netfilter/core.c:623
[<ffffffff8573764a>] nf_hook include/linux/netfilter.h:272 [inline]
[<ffffffff8573764a>] NF_HOOK include/linux/netfilter.h:315 [inline]
[<ffffffff8573764a>] ip_local_deliver+0x2ea/0x568 net/ipv4/ip_input.c:254
[<ffffffff85735700>] dst_input include/net/dst.h:469 [inline]
[<ffffffff85735700>] ip_rcv_finish+0x1b0/0x2d2 net/ipv4/ip_input.c:447
[<ffffffff8573799e>] NF_HOOK include/linux/netfilter.h:317 [inline]
[<ffffffff8573799e>] NF_HOOK include/linux/netfilter.h:311 [inline]
[<ffffffff8573799e>] ip_rcv+0xd6/0x44e net/ipv4/ip_input.c:567
[<ffffffff850f58a8>] __netif_receive_skb_one_core+0x106/0x16e net/core/dev.c:5977
[<ffffffff850f5b28>] __netif_receive_skb+0x2c/0x144 net/core/dev.c:6090
[<ffffffff850f6d28>] process_backlog+0x4f6/0x1cb0 net/core/dev.c:6442
[<ffffffff850fb6c2>] __napi_poll.constprop.0+0xaa/0x4ba net/core/dev.c:7414
[<ffffffff850fc5a6>] napi_poll net/core/dev.c:7478 [inline]
[<ffffffff850fc5a6>] net_rx_action+0xad4/0xefc net/core/dev.c:7605
[<ffffffff8015e7ae>] handle_softirqs+0x4b2/0x132e kernel/softirq.c:579
[<ffffffff8015f6f8>] run_ksoftirqd kernel/softirq.c:968 [inline]
[<ffffffff8015f6f8>] run_ksoftirqd+0xce/0x144 kernel/softirq.c:960
[<ffffffff801f41fc>] smpboot_thread_fn+0x420/0xc80 kernel/smpboot.c:164
[<ffffffff801ddcbc>] kthread+0x39c/0x7d4 kernel/kthread.c:464
[<ffffffff8006977a>] ret_from_fork_kernel+0x2a/0xbb2 arch/riscv/kernel/process.c:214
[<ffffffff863251ea>] ret_from_fork_kernel_asm+0x16/0x18 arch/riscv/kernel/entry.S:327