INFO: task syz.0.847:6187 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.0.847       state:D stack:0     pid:6187  tgid:6183  ppid:3190   task_flags:0x40054c flags:0x00000004
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/37:
 #0: ffffffff883dc420 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2a/0x1a0 kernel/locking/lockdep.c:6766
1 lock held by syslogd/3001:
2 locks held by getty/3154:
 #0: ffffaf801c2b90a0 (&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/3182:
1 lock held by kworker/R-wg-cr/3360:
 #0: ffffffff88291a28 (wq_pool_attach_mutex){+.+.}-{4:4}, at: worker_attach_to_pool+0x36/0x3c4 kernel/workqueue.c:2678
1 lock held by kworker/R-wg-cr/3367:
 #0: ffffffff88291a28 (wq_pool_attach_mutex){+.+.}-{4:4}, at: worker_attach_to_pool+0x36/0x3c4 kernel/workqueue.c:2678
1 lock held by kworker/R-wg-cr/3383:
 #0: ffffffff88291a28 (wq_pool_attach_mutex){+.+.}-{4:4}, at: worker_attach_to_pool+0x36/0x3c4 kernel/workqueue.c:2678
1 lock held by kworker/R-wg-cr/3386:
1 lock held by kworker/R-wg-cr/3400:
 #0: ffffffff88291a28 (wq_pool_attach_mutex){+.+.}-{4:4}, at: worker_attach_to_pool+0x36/0x3c4 kernel/workqueue.c:2678
1 lock held by kworker/R-wg-cr/3417:
 #0: ffffffff88291a28 (wq_pool_attach_mutex){+.+.}-{4:4}, at: worker_attach_to_pool+0x36/0x3c4 kernel/workqueue.c:2678
2 locks held by kworker/1:4/3886:
2 locks held by kworker/0:4/4037:
3 locks held by kworker/u10:4/4781:
2 locks held by kworker/0:7/5119:
2 locks held by kworker/0:1/5590:
2 locks held by kworker/0:0/5951:
2 locks held by kworker/0:2/6025:
1 lock held by syz.0.847/6187:
 #0: ffffffff883ec640 (rcu_state.barrier_mutex){+.+.}-{4:4}, at: rcu_barrier+0x56/0x6cc kernel/rcu/tree.c:3782
2 locks held by kworker/0:5/6188:
2 locks held by kworker/0:6/6202:
1 lock held by kworker/0:8/6204:
2 locks held by kworker/0:9/6213:
2 locks held by kworker/0:10/6227:
1 lock held by kworker/R-wg-cr/6325:
 #0: ffffffff88291a28 (wq_pool_attach_mutex){+.+.}-{4:4}, at: worker_detach_from_pool kernel/workqueue.c:2736 [inline]
 #0: ffffffff88291a28 (wq_pool_attach_mutex){+.+.}-{4:4}, at: rescuer_thread+0x776/0xd68 kernel/workqueue.c:3531
1 lock held by kworker/R-wg-cr/6328:
1 lock held by kworker/R-wg-cr/6331:
 #0: ffffffff88291a28 (wq_pool_attach_mutex){+.+.}-{4:4}, at: worker_attach_to_pool+0x36/0x3c4 kernel/workqueue.c:2678
2 locks held by kworker/0:11/6428:
1 lock held by syz.1.867/6456:
 #0: ffffffff883ec640 (rcu_state.barrier_mutex){+.+.}-{4:4}, at: rcu_barrier+0x56/0x6cc kernel/rcu/tree.c:3782
3 locks held by syz-executor/6572:
2 locks held by kworker/0:12/6718:
2 locks held by kworker/0:14/6936:
2 locks held by rm/6965:

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

NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 37 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 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 5119 Comm: kworker/0:7 Not tainted 6.16.0-rc1-syzkaller-gfda589c28604 #0 PREEMPT 
Hardware name: riscv-virtio,qemu (DT)
Workqueue: wg-crypt-wg2 wg_packet_encrypt_worker
epc : __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline]
epc : _raw_spin_unlock_irqrestore+0x36/0xd4 kernel/locking/spinlock.c:194
 ra : __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:151 [inline]
 ra : _raw_spin_unlock_irqrestore+0x86/0xd4 kernel/locking/spinlock.c:194
epc : ffffffff86348bd2 ra : ffffffff86348c22 sp : ffff8f8000006ca0
 gp : ffffffff89c83e20 tp : ffffaf801aa90000 t0 : ffff8f8000007520
 t1 : fffff5ef028de8a8 t2 : fffffffff2f20000 s0 : ffff8f8000006cc0
 s1 : 0000000000000002 a0 : 0000000000000000 a1 : ffffffff87d71d08
 a2 : 0000000000000003 a3 : 0000000000000103 a4 : 0000000000000001
 a5 : 0000000000000000 a6 : 0000000000f00000 a7 : ffffaf80146f4543
 s2 : ffffaf80146f4540 s3 : ffff8d8000702410 s4 : ffff8f8000006da8
 s5 : ffffaf801469f8c0 s6 : ffffaf80146f4588 s7 : 0000000000000820
 s8 : ffff8d8000c5eec0 s9 : ffffffff89cc4e20 s10: 0000000000000005
 s11: ffff8d8000c5eec0 t3 : dc35624b00000000 t4 : fffff5ef028de8a8
 t5 : fffff5ef028de8a9 t6 : 0000000000000002
status: 0000000200000120 badaddr: 0000000000000000 cause: 8000000000000001
[<ffffffff86348bd2>] arch_local_irq_restore arch/riscv/include/asm/irqflags.h:51 [inline]
[<ffffffff86348bd2>] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:151 [inline]
[<ffffffff86348bd2>] _raw_spin_unlock_irqrestore+0x36/0xd4 kernel/locking/spinlock.c:194
[<ffffffff80a50612>] spin_unlock_irqrestore include/linux/spinlock.h:406 [inline]
[<ffffffff80a50612>] get_partial_node.part.0+0x16e/0x2b4 mm/slub.c:2901
[<ffffffff80a4d840>] get_partial_node mm/slub.c:2864 [inline]
[<ffffffff80a4d840>] get_partial mm/slub.c:2981 [inline]
[<ffffffff80a4d840>] ___slab_alloc+0x7c8/0x1214 mm/slub.c:3839
[<ffffffff80a4e2ec>] __slab_alloc.constprop.0+0x60/0xb0 mm/slub.c:3949
[<ffffffff80a5346a>] __slab_alloc_node mm/slub.c:4024 [inline]
[<ffffffff80a5346a>] slab_alloc_node mm/slub.c:4185 [inline]
[<ffffffff80a5346a>] kmem_cache_alloc_node_noprof+0xd2/0x3dc mm/slub.c:4249
[<ffffffff85084e60>] __alloc_skb+0x33a/0x438 net/core/skbuff.c:660
[<ffffffff855f9d06>] alloc_skb include/linux/skbuff.h:1336 [inline]
[<ffffffff855f9d06>] synproxy_send_client_synack+0x1ae/0x8be net/netfilter/nf_synproxy_core.c:460
[<ffffffff856d3b6c>] nft_synproxy_eval_v4 net/netfilter/nft_synproxy.c:59 [inline]
[<ffffffff856d3b6c>] nft_synproxy_do_eval+0x8ac/0xa52 net/netfilter/nft_synproxy.c:141
[<ffffffff856d3d70>] nft_synproxy_eval+0x28/0x36 net/netfilter/nft_synproxy.c:247
[<ffffffff8560569a>] expr_call_ops_eval net/netfilter/nf_tables_core.c:237 [inline]
[<ffffffff8560569a>] nft_do_chain+0x328/0x1598 net/netfilter/nf_tables_core.c:285
[<ffffffff85661858>] nft_do_chain_inet+0x180/0x316 net/netfilter/nft_chain_filter.c:161
[<ffffffff8553aab8>] nf_hook_entry_hookfn include/linux/netfilter.h:157 [inline]
[<ffffffff8553aab8>] nf_hook_slow+0xb8/0x1ec net/netfilter/core.c:623
[<ffffffff8575f91a>] nf_hook include/linux/netfilter.h:272 [inline]
[<ffffffff8575f91a>] NF_HOOK include/linux/netfilter.h:315 [inline]
[<ffffffff8575f91a>] ip_local_deliver+0x2ea/0x568 net/ipv4/ip_input.c:254
[<ffffffff8575d9d0>] dst_input include/net/dst.h:469 [inline]
[<ffffffff8575d9d0>] ip_rcv_finish+0x1b0/0x2d2 net/ipv4/ip_input.c:447
[<ffffffff8575fc6e>] NF_HOOK include/linux/netfilter.h:317 [inline]
[<ffffffff8575fc6e>] NF_HOOK include/linux/netfilter.h:311 [inline]
[<ffffffff8575fc6e>] ip_rcv+0xd6/0x44e 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
[<ffffffff8634d5b4>] __do_softirq+0x12/0x1a kernel/softirq.c:613
[<ffffffff8006845c>] ___do_softirq+0x18/0x20 arch/riscv/kernel/irq.c:85
[<ffffffff8634d502>] call_on_irq_stack+0x32/0x40 arch/riscv/kernel/entry.S:360