INFO: task syz.2.2345:9817 blocked for more than 430 seconds.
      Not tainted 6.14.0-rc1-syzkaller-g245aece3750d #0
      Blocked by coredump.
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.2.2345      state:D stack:0     pid:9817  tgid:9817  ppid:6514   task_flags:0x40044c flags:0x0000000c
Call Trace:
[<ffffffff86245be6>] context_switch kernel/sched/core.c:5377 [inline]
[<ffffffff86245be6>] __schedule+0xe4c/0x3d70 kernel/sched/core.c:6764
[<ffffffff86248bce>] __schedule_loop kernel/sched/core.c:6841 [inline]
[<ffffffff86248bce>] schedule+0xc4/0x324 kernel/sched/core.c:6856
[<ffffffff8625ce86>] schedule_timeout+0x1c6/0x28a kernel/time/sleep_timeout.c:75
[<ffffffff8624a70a>] do_wait_for_common kernel/sched/completion.c:95 [inline]
[<ffffffff8624a70a>] __wait_for_common+0x1ca/0x4b6 kernel/sched/completion.c:116
[<ffffffff8624aa10>] wait_for_common kernel/sched/completion.c:127 [inline]
[<ffffffff8624aa10>] wait_for_completion+0x1a/0x22 kernel/sched/completion.c:148
[<ffffffff803682e2>] rcu_barrier+0x2dc/0x6cc kernel/rcu/tree.c:3809
[<ffffffff84fa782a>] netdev_run_todo+0x294/0x10b4 net/core/dev.c:11130
[<ffffffff84fd236c>] rtnl_unlock+0x14/0x1c net/core/rtnetlink.c:151
[<ffffffff831a1fe8>] tun_detach drivers/net/tun.c:708 [inline]
[<ffffffff831a1fe8>] tun_chr_close+0xde/0x230 drivers/net/tun.c:3521
[<ffffffff80b645b6>] __fput+0x37e/0x9f4 fs/file_table.c:448
[<ffffffff80b64cd2>] ____fput+0x1c/0x26 fs/file_table.c:476
[<ffffffff801cdc88>] task_work_run+0x16a/0x25e kernel/task_work.c:227
[<ffffffff8014e28c>] exit_task_work include/linux/task_work.h:40 [inline]
[<ffffffff8014e28c>] do_exit+0xa46/0x2966 kernel/exit.c:938
[<ffffffff8015070c>] do_group_exit+0xd4/0x26c kernel/exit.c:1087
[<ffffffff80187d02>] get_signal+0x1f4e/0x22e0 kernel/signal.c:3036
[<ffffffff8006da8e>] arch_do_signal_or_restart+0x77c/0x207a arch/riscv/kernel/signal.c:431
[<ffffffff8623c4f8>] exit_to_user_mode_loop kernel/entry/common.c:111 [inline]
[<ffffffff8623c4f8>] exit_to_user_mode_prepare include/linux/entry-common.h:329 [inline]
[<ffffffff8623c4f8>] __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
[<ffffffff8623c4f8>] syscall_exit_to_user_mode+0x222/0x2a4 kernel/entry/common.c:218
[<ffffffff8623b33a>] do_trap_ecall_u+0x86/0x216 arch/riscv/kernel/traps.c:345
[<ffffffff8626117a>] handle_exception+0x146/0x152 arch/riscv/kernel/entry.S:197

Showing all locks held in the system:
1 lock held by khungtaskd/36:
 #0: ffffffff883d7b80 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x68/0x288 kernel/locking/lockdep.c:6742
2 locks held by getty/3139:
 #0: ffffaf801897e0a0 (&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+0xd7c/0x129a drivers/tty/n_tty.c:2211
1 lock held by kworker/R-wg-cr/3375:
 #0: ffffffff8828d768 (wq_pool_attach_mutex){+.+.}-{4:4}, at: worker_detach_from_pool kernel/workqueue.c:2734 [inline]
 #0: ffffffff8828d768 (wq_pool_attach_mutex){+.+.}-{4:4}, at: rescuer_thread+0x73e/0xc72 kernel/workqueue.c:3533
3 locks held by kworker/1:0/5949:
4 locks held by kworker/R-wg-cr/6655:
1 lock held by kworker/R-wg-cr/6658:
 #0: ffffffff8828d768 (wq_pool_attach_mutex){+.+.}-{4:4}, at: worker_detach_from_pool kernel/workqueue.c:2734 [inline]
 #0: ffffffff8828d768 (wq_pool_attach_mutex){+.+.}-{4:4}, at: rescuer_thread+0x73e/0xc72 kernel/workqueue.c:3533
1 lock held by kworker/R-wg-cr/6661:
 #0: ffffffff8828d768 (wq_pool_attach_mutex){+.+.}-{4:4}, at: worker_attach_to_pool+0x36/0x3c4 kernel/workqueue.c:2676
2 locks held by kworker/1:2/7001:
2 locks held by kworker/1:3/8017:
2 locks held by kworker/1:1/9462:
2 locks held by kworker/1:4/9576:
2 locks held by kworker/0:0/9615:
1 lock held by syz.2.2345/9817:
 #0: ffffffff883e7d00 (rcu_state.barrier_mutex){+.+.}-{4:4}, at: rcu_barrier+0x56/0x6cc kernel/rcu/tree.c:3741
2 locks held by kworker/1:5/9825:
3 locks held by kworker/u9:6/9832:
2 locks held by kworker/1:7/9935:
1 lock held by kworker/R-wg-cr/9964:
1 lock held by kworker/R-wg-cr/9967:
 #0: ffffffff8828d768 (wq_pool_attach_mutex){+.+.}-{4:4}, at: worker_attach_to_pool+0x36/0x3c4 kernel/workqueue.c:2676
1 lock held by syz.0.2367/10088:
 #0: ffffffff883e7d00 (rcu_state.barrier_mutex){+.+.}-{4:4}, at: rcu_barrier+0x56/0x6cc kernel/rcu/tree.c:3741
3 locks held by kworker/u9:8/10096:
2 locks held by kworker/1:8/10201:
2 locks held by kworker/u9:9/10252:
 #0: ffffaf8011a89148 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x848/0x1f3a kernel/workqueue.c:3211
 #1: ffff8f8002027bd0 ((work_completion)(&sub_info->work)){+.+.}-{0:0}, at: process_one_work+0x870/0x1f3a kernel/workqueue.c:3211
2 locks held by kworker/1:9/10502:
2 locks held by kworker/1:10/10531:
4 locks held by modprobe/10557:
1 lock held by syz-executor/10558:

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

NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 36 Comm: khungtaskd Not tainted 6.14.0-rc1-syzkaller-g245aece3750d #0
Hardware name: riscv-virtio,qemu (DT)
Call Trace:
[<ffffffff80074518>] dump_backtrace+0x2e/0x3c arch/riscv/kernel/stacktrace.c:132
[<ffffffff80003206>] show_stack+0x30/0x3c arch/riscv/kernel/stacktrace.c:138
[<ffffffff8005fa4c>] __dump_stack lib/dump_stack.c:94 [inline]
[<ffffffff8005fa4c>] dump_stack_lvl+0x12e/0x1a6 lib/dump_stack.c:120
[<ffffffff8005fae0>] dump_stack+0x1c/0x24 lib/dump_stack.c:129
[<ffffffff861ff5f8>] nmi_cpu_backtrace+0x3b0/0x3b2 lib/nmi_backtrace.c:113
[<ffffffff861ff8b0>] nmi_trigger_cpumask_backtrace+0x2b6/0x458 lib/nmi_backtrace.c:62
[<ffffffff80080416>] arch_trigger_cpumask_backtrace+0x2c/0x3e arch/riscv/kernel/smp.c:348
[<ffffffff804d9498>] trigger_all_cpu_backtrace include/linux/nmi.h:162 [inline]
[<ffffffff804d9498>] check_hung_uninterruptible_tasks kernel/hung_task.c:236 [inline]
[<ffffffff804d9498>] watchdog+0xcf2/0x11de kernel/hung_task.c:399
[<ffffffff801d3ae2>] kthread+0x37e/0x7b6 kernel/kthread.c:464
[<ffffffff86261292>] ret_from_fork+0xe/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: 5949 Comm: kworker/1:0 Not tainted 6.14.0-rc1-syzkaller-g245aece3750d #0
Hardware name: riscv-virtio,qemu (DT)
Workqueue: wg-kex-wg2 wg_packet_handshake_receive_worker
epc : preempt_count include/asm-generic/preempt.h:11 [inline]
epc : should_resched include/asm-generic/preempt.h:77 [inline]
epc : __local_bh_enable_ip+0x38e/0x5e8 kernel/softirq.c:396
 ra : __local_bh_enable_ip+0x38a/0x5e8 kernel/softirq.c:394
epc : ffffffff8015915e ra : ffffffff8015915a sp : ffff8f8000017470
 gp : ffffffff89c21d80 tp : ffffaf80137c3400 t0 : 81987a7bdfef251d
 t1 : 0000000000000000 t2 : 0000000000000005 s0 : ffff8f80000174c0
 s1 : 0000000000000102 a0 : 0000000000000001 a1 : ffffffff86842000
 a2 : 0000000000000003 a3 : 0000000000000101 a4 : 0000000000000001
 a5 : 000000000032f5a8 a6 : ffffaf80137c3f60 a7 : 1ffff5f0026f87ec
 s2 : ffffaf80137c3400 s3 : ffffffff8585ff5e s4 : 0000000000000001
 s5 : ffffffff90fd0260 s6 : 1ffff5f0026f8681 s7 : ffffffff89c61300
 s8 : ffff8f8000017700 s9 : dfffffff00000000 s10: ffffaf801cd31100
 s11: ffff8f80000176a0 t3 : 1ffff5f0038ec001 t4 : ffffffff8766b568
 t5 : ffffaf80381a8128 t6 : 0000000000000009
status: 0000000200000120 badaddr: 0000000000000000 cause: 8000000000000001
[<ffffffff8015915e>] arch_local_irq_enable arch/riscv/include/asm/irqflags.h:21 [inline]
[<ffffffff8015915e>] __local_bh_enable_ip+0x38e/0x5e8 kernel/softirq.c:394
[<ffffffff8585ff84>] local_bh_enable include/linux/bottom_half.h:33 [inline]
[<ffffffff8585ff84>] ipt_do_table+0xe9c/0x1d56 net/ipv4/netfilter/ip_tables.c:357
[<ffffffff85863628>] iptable_mangle_hook+0x6c/0x44a net/ipv4/netfilter/iptable_mangle.c:80
[<ffffffff85395d24>] nf_hook_entry_hookfn include/linux/netfilter.h:154 [inline]
[<ffffffff85395d24>] nf_hook_slow+0xb8/0x1ec net/netfilter/core.c:626
[<ffffffff855b69e2>] nf_hook include/linux/netfilter.h:269 [inline]
[<ffffffff855b69e2>] NF_HOOK include/linux/netfilter.h:312 [inline]
[<ffffffff855b69e2>] ip_rcv+0x20e/0x44e net/ipv4/ip_input.c:567
[<ffffffff84f95f80>] __netif_receive_skb_one_core+0x106/0x16e net/core/dev.c:5828
[<ffffffff84f96200>] __netif_receive_skb+0x2c/0x144 net/core/dev.c:5941
[<ffffffff84f97400>] process_backlog+0x4f6/0x1cb0 net/core/dev.c:6289
[<ffffffff84f9bd96>] __napi_poll.constprop.0+0xaa/0x4b8 net/core/dev.c:7106
[<ffffffff84f9cbb6>] napi_poll net/core/dev.c:7175 [inline]
[<ffffffff84f9cbb6>] net_rx_action+0xa12/0xf10 net/core/dev.c:7297
[<ffffffff80156a72>] handle_softirqs+0x4b2/0x132e kernel/softirq.c:561
[<ffffffff80157bbe>] __do_softirq kernel/softirq.c:595 [inline]
[<ffffffff80157bbe>] invoke_softirq kernel/softirq.c:435 [inline]
[<ffffffff80157bbe>] __irq_exit_rcu+0x18c/0x550 kernel/softirq.c:662
[<ffffffff801595c4>] irq_exit_rcu+0x10/0xf8 kernel/softirq.c:678
[<ffffffff8623ad08>] handle_riscv_irq+0x40/0x4c arch/riscv/kernel/traps.c:378
[<ffffffff862612ce>] call_on_irq_stack+0x32/0x40 arch/riscv/kernel/entry.S:356