INFO: task syz.2.688:5975 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.2.688       state:D stack:0     pid:5975  tgid:5974  ppid:5335   task_flags:0x40054c flags:0x00000004
Call Trace:
[<ffffffff8632de30>] context_switch kernel/sched/core.c:5396 [inline]
[<ffffffff8632de30>] __schedule+0x1022/0x4094 kernel/sched/core.c:6785
[<ffffffff86330f66>] __schedule_loop kernel/sched/core.c:6863 [inline]
[<ffffffff86330f66>] schedule+0xc4/0x35e kernel/sched/core.c:6878
[<ffffffff863454fa>] schedule_timeout+0x1c6/0x2ae kernel/time/sleep_timeout.c:75
[<ffffffff86332aee>] do_wait_for_common kernel/sched/completion.c:95 [inline]
[<ffffffff86332aee>] __wait_for_common+0x1d2/0x3e8 kernel/sched/completion.c:116
[<ffffffff86332d1e>] wait_for_common kernel/sched/completion.c:127 [inline]
[<ffffffff86332d1e>] 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
[<ffffffff8632339c>] exit_to_user_mode_prepare include/linux/entry-common.h:330 [inline]
[<ffffffff8632339c>] syscall_exit_to_user_mode_work include/linux/entry-common.h:414 [inline]
[<ffffffff8632339c>] syscall_exit_to_user_mode include/linux/entry-common.h:449 [inline]
[<ffffffff8632339c>] do_trap_ecall_u+0x3f0/0x530 arch/riscv/kernel/traps.c:355
[<ffffffff8634b7da>] handle_exception+0x146/0x152 arch/riscv/kernel/entry.S:197

Showing all locks held in the system:
1 lock held by khungtaskd/36:
 #0: ffffffff883dc420 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2a/0x1a0 kernel/locking/lockdep.c:6766
2 locks held by kworker/0:2/999:
1 lock held by klogd/3007:
2 locks held by getty/3174:
 #0: ffffaf8018e730a0 (&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
2 locks held by syz-executor/3206:
2 locks held by kworker/0:0/3208:
3 locks held by kworker/u10:3/3867:
2 locks held by kworker/0:1/4600:
3 locks held by kworker/u10:4/5564:
2 locks held by kworker/0:4/5756:
2 locks held by kworker/0:6/5944:
2 locks held by kworker/0:7/5960:
5 locks held by kworker/u10:6/5961:
1 lock held by syz.2.688/5975:
 #0: ffffffff883ec640 (rcu_state.barrier_mutex){+.+.}-{4:4}, at: rcu_barrier+0x56/0x6cc kernel/rcu/tree.c:3782
2 locks held by kworker/0:9/5990:
3 locks held by kworker/u10:7/6053:
2 locks held by kworker/0:14/6243:
2 locks held by kworker/u10:8/6403:
 #0: ffffaf8011a89148 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x848/0x1f32 kernel/workqueue.c:3213
 #1: ffff8f8003047b70 ((work_completion)(&sub_info->work)){+.+.}-{0:0}, at: process_one_work+0x870/0x1f32 kernel/workqueue.c:3213
2 locks held by kworker/0:15/6433:
1 lock held by syz.0.727/6441:
1 lock held by modprobe/6443:

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

NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 36 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
[<ffffffff862e5a74>] nmi_cpu_backtrace+0x3b0/0x3b2 lib/nmi_backtrace.c:113
[<ffffffff862e5d2c>] 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
[<ffffffff8634b8fa>] ret_from_fork_kernel_asm+0x16/0x18 arch/riscv/kernel/entry.S:327
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 3909 Comm: kworker/0:3 Not tainted 6.16.0-rc1-syzkaller-gfda589c28604 #0 PREEMPT 
Hardware name: riscv-virtio,qemu (DT)
Workqueue: wg-crypt-wg2 wg_packet_tx_worker
epc : ipv4_get_l4proto+0x168/0x380 net/netfilter/nf_conntrack_core.c:358
 ra : ipv4_get_l4proto+0x13e/0x380 net/netfilter/nf_conntrack_core.c:358
epc : ffffffff855616b4 ra : ffffffff8556168a sp : ffff8f8000007530
 gp : ffffffff89c83ca0 tp : ffffaf80305b1a40 t0 : ffffaf802172db80
 t1 : 0000000000000000 t2 : fffffffff2f20000 s0 : ffff8f8000007630
 s1 : ffffaf8029682800 a0 : ffffaf8029682806 a1 : 0000000000000013
 a2 : 0000000000f00000 a3 : ffffffff8556168a a4 : 0000000000000000
 a5 : 0000000000000001 a6 : 0000000000f00000 a7 : 0000000000000004
 s2 : ffffaf802172db40 s3 : 1ffff1f000000ea8 s4 : ffff8f8000007730
 s5 : 0000000000000000 s6 : ffff8f8000007560 s7 : ffffaf8029682800
 s8 : 0000000000000028 s9 : 0000000000000003 s10: ffffffff87643540
 s11: ffff8f80000077c0 t3 : 1ffff5f003218201 t4 : ffffffff876aac08
 t5 : ffffaf802f6ae128 t6 : 0000000000000002
status: 0000000200000120 badaddr: 0000000000000000 cause: 8000000000000001
[<ffffffff855616b4>] ipv4_get_l4proto+0x168/0x380 net/netfilter/nf_conntrack_core.c:358
[<ffffffff8556b260>] get_l4proto net/netfilter/nf_conntrack_core.c:407 [inline]
[<ffffffff8556b260>] nf_conntrack_in+0x10a8/0x1c3c net/netfilter/nf_conntrack_core.c:2018
[<ffffffff8557ae40>] ipv4_conntrack_in+0x20/0x2e net/netfilter/nf_conntrack_proto.c:207
[<ffffffff855393e0>] nf_hook_entry_hookfn include/linux/netfilter.h:157 [inline]
[<ffffffff855393e0>] nf_hook_slow+0xb8/0x1ec net/netfilter/core.c:623
[<ffffffff8575e6ce>] nf_hook include/linux/netfilter.h:272 [inline]
[<ffffffff8575e6ce>] NF_HOOK include/linux/netfilter.h:315 [inline]
[<ffffffff8575e6ce>] 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
[<ffffffff8634b9f4>] __do_softirq+0x12/0x1a kernel/softirq.c:613
[<ffffffff8006845c>] ___do_softirq+0x18/0x20 arch/riscv/kernel/irq.c:85
[<ffffffff8634b942>] call_on_irq_stack+0x32/0x40 arch/riscv/kernel/entry.S:360