INFO: task syz.0.284:4602 blocked for more than 430 seconds.
      Not tainted 6.17.0-rc1-syzkaller-g8f5ae30d69d7 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.0.284       state:D stack:0     pid:4602  tgid:4602  ppid:3199   task_flags:0x400040 flags:0x0000000c
Call Trace:
[<ffffffff863ce5c0>] context_switch kernel/sched/core.c:5357 [inline]
[<ffffffff863ce5c0>] __schedule+0x1042/0x4106 kernel/sched/core.c:6961
[<ffffffff863d1748>] __schedule_loop kernel/sched/core.c:7043 [inline]
[<ffffffff863d1748>] schedule+0xc4/0x35e kernel/sched/core.c:7058
[<ffffffff863e72b2>] schedule_timeout+0x1c6/0x2ae kernel/time/sleep_timeout.c:75
[<ffffffff863d32fe>] do_wait_for_common kernel/sched/completion.c:100 [inline]
[<ffffffff863d32fe>] __wait_for_common+0x1d2/0x3e8 kernel/sched/completion.c:121
[<ffffffff863d352e>] wait_for_common kernel/sched/completion.c:132 [inline]
[<ffffffff863d352e>] wait_for_completion+0x1a/0x22 kernel/sched/completion.c:153
[<ffffffff8038232e>] rcu_barrier+0x2dc/0x6cc kernel/rcu/tree.c:3883
[<ffffffff851da756>] netdev_run_todo+0x294/0x10b4 net/core/dev.c:11460
[<ffffffff8520b8f4>] rtnl_unlock+0x14/0x1c net/core/rtnetlink.c:157
[<ffffffff8336ff38>] tun_detach drivers/net/tun.c:640 [inline]
[<ffffffff8336ff38>] tun_chr_close+0xde/0x230 drivers/net/tun.c:3433
[<ffffffff80c2f104>] __fput+0x382/0xa8c fs/file_table.c:468
[<ffffffff80c2f8bc>] ____fput+0x1c/0x26 fs/file_table.c:496
[<ffffffff801e236c>] task_work_run+0x16a/0x25e kernel/task_work.c:227
[<ffffffff803c2386>] resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
[<ffffffff803c2386>] exit_to_user_mode_loop+0x118/0x134 kernel/entry/common.c:43
[<ffffffff863c3cd0>] exit_to_user_mode_prepare include/linux/irq-entry-common.h:225 [inline]
[<ffffffff863c3cd0>] syscall_exit_to_user_mode_work include/linux/entry-common.h:175 [inline]
[<ffffffff863c3cd0>] syscall_exit_to_user_mode include/linux/entry-common.h:210 [inline]
[<ffffffff863c3cd0>] do_trap_ecall_u+0x3f0/0x530 arch/riscv/kernel/traps.c:357
[<ffffffff863ed596>] handle_exception+0x146/0x152 arch/riscv/kernel/entry.S:197

Showing all locks held in the system:
1 lock held by khungtaskd/37:
 #0: ffffffff883dd9a0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2a/0x1a0 kernel/locking/lockdep.c:6771
1 lock held by klogd/3016:
2 locks held by getty/3166:
 #0: ffffaf801d68e0a0 (&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/3192:
3 locks held by kworker/u8:2/3630:
 #0: ffffaf80189ec948 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work+0x848/0x1f32 kernel/workqueue.c:3211
 #1: ffff8f800d6a7b70 ((work_completion)(&(&net->ipv6.addr_chk_work)->work)){+.+.}-{0:0}, at: process_one_work+0x870/0x1f32 kernel/workqueue.c:3211
 #2: ffffffff8988bee8 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock+0x22/0x2a net/core/rtnetlink.c:80
2 locks held by kworker/1:3/3845:
2 locks held by kworker/1:4/4022:
2 locks held by kworker/1:5/4159:
2 locks held by kworker/1:6/4234:
4 locks held by kworker/1:9/4280:
2 locks held by kworker/1:10/4316:
3 locks held by kworker/u9:1/4383:
2 locks held by kworker/0:7/4441:
1 lock held by syz.0.284/4602:
 #0: ffffffff883eda40 (rcu_state.barrier_mutex){+.+.}-{4:4}, at: rcu_barrier+0x56/0x6cc kernel/rcu/tree.c:3815
1 lock held by kworker/u9:6/4628:
3 locks held by syz-executor/4630:
2 locks held by kworker/1:12/4637:
2 locks held by kworker/1:14/4720:
2 locks held by syz.1.314/4979:

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

NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 37 Comm: khungtaskd Not tainted 6.17.0-rc1-syzkaller-g8f5ae30d69d7 #0 PREEMPT 
Hardware name: riscv-virtio,qemu (DT)
Call Trace:
[<ffffffff8007949a>] dump_backtrace+0x2e/0x3c arch/riscv/kernel/stacktrace.c:132
[<ffffffff8000329a>] show_stack+0x30/0x3c arch/riscv/kernel/stacktrace.c:138
[<ffffffff80060b76>] __dump_stack lib/dump_stack.c:94 [inline]
[<ffffffff80060b76>] dump_stack_lvl+0x12e/0x1a6 lib/dump_stack.c:120
[<ffffffff80060c0a>] dump_stack+0x1c/0x24 lib/dump_stack.c:129
[<ffffffff8638596a>] nmi_cpu_backtrace+0x3b0/0x3b2 lib/nmi_backtrace.c:113
[<ffffffff86385c22>] nmi_trigger_cpumask_backtrace+0x2b6/0x458 lib/nmi_backtrace.c:62
[<ffffffff8008705c>] arch_trigger_cpumask_backtrace+0x2c/0x3c arch/riscv/kernel/smp.c:350
[<ffffffff805000a4>] trigger_all_cpu_backtrace include/linux/nmi.h:160 [inline]
[<ffffffff805000a4>] check_hung_uninterruptible_tasks kernel/hung_task.c:328 [inline]
[<ffffffff805000a4>] watchdog+0xc56/0x1134 kernel/hung_task.c:491
[<ffffffff801e843c>] kthread+0x39c/0x7d4 kernel/kthread.c:463
[<ffffffff800699c4>] ret_from_fork_kernel+0x2a/0xbb4 arch/riscv/kernel/process.c:214
[<ffffffff863ed6b6>] 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: 3845 Comm: kworker/1:3 Not tainted 6.17.0-rc1-syzkaller-g8f5ae30d69d7 #0 PREEMPT 
Hardware name: riscv-virtio,qemu (DT)
Workqueue: wg-crypt-wg0 wg_packet_tx_worker
epc : ___slab_alloc+0x1d4/0x1192 mm/slub.c:3821
 ra : ___slab_alloc+0x64e/0x1192 mm/slub.c:3782
epc : ffffffff80a77920 ra : ffffffff80a77d9a sp : ffff8f8000016d60
 gp : ffffffff89c9e5c0 tp : ffffaf80146b3480 t0 : ffff8f8000017520
 t1 : 0000000000000001 t2 : 0000000000000000 s0 : ffff8f8000016e70
 s1 : ffffffff91047920 a0 : 0000000000000001 a1 : ffffffff87d8a7a8
 a2 : 0000000000000003 a3 : 0000000000000102 a4 : 0000000000000001
 a5 : 0000000000000000 a6 : 0000000000f00000 a7 : ffffffff80a777e8
 s2 : ffffaf806ed62030 s3 : ffffaf80142c43c0 s4 : ffffaf806ed62050
 s5 : ffffffff91047928 s6 : 0000000000007fff s7 : ffffffffffffffff
 s8 : 0000000000000000 s9 : ffff8d800077b000 s10: ffffffff89dab160
 s11: 0000000000000002 t3 : 19ab921c00000000 t4 : 0000000000001fff
 t5 : 00000000000000c8 t6 : 0000000000000002
status: 0000000200000120 badaddr: 0000000000000000 cause: 8000000000000001
[<ffffffff80a77920>] arch_local_irq_restore arch/riscv/include/asm/irqflags.h:51 [inline]
[<ffffffff80a77920>] ___slab_alloc+0x1d4/0x1192 mm/slub.c:3782
[<ffffffff80a7893e>] __slab_alloc.constprop.0+0x60/0xb0 mm/slub.c:3981
[<ffffffff80a7d92e>] __slab_alloc_node mm/slub.c:4056 [inline]
[<ffffffff80a7d92e>] slab_alloc_node mm/slub.c:4217 [inline]
[<ffffffff80a7d92e>] kmem_cache_alloc_node_noprof+0xd2/0x3c8 mm/slub.c:4281
[<ffffffff85130bb8>] __alloc_skb+0x33c/0x43a net/core/skbuff.c:659
[<ffffffff856aebb6>] alloc_skb include/linux/skbuff.h:1336 [inline]
[<ffffffff856aebb6>] synproxy_send_client_synack+0x1ae/0x8be net/netfilter/nf_synproxy_core.c:460
[<ffffffff85786f80>] nft_synproxy_eval_v4 net/netfilter/nft_synproxy.c:59 [inline]
[<ffffffff85786f80>] nft_synproxy_do_eval+0x8ac/0xa52 net/netfilter/nft_synproxy.c:141
[<ffffffff85787184>] nft_synproxy_eval+0x28/0x36 net/netfilter/nft_synproxy.c:247
[<ffffffff856ba546>] expr_call_ops_eval net/netfilter/nf_tables_core.c:237 [inline]
[<ffffffff856ba546>] nft_do_chain+0x328/0x1598 net/netfilter/nf_tables_core.c:285
[<ffffffff8571656c>] nft_do_chain_inet+0x180/0x316 net/netfilter/nft_chain_filter.c:161
[<ffffffff855ef63a>] nf_hook_entry_hookfn include/linux/netfilter.h:158 [inline]
[<ffffffff855ef63a>] nf_hook_slow+0xb8/0x1ec net/netfilter/core.c:623
[<ffffffff85811b2e>] nf_hook include/linux/netfilter.h:273 [inline]
[<ffffffff85811b2e>] NF_HOOK include/linux/netfilter.h:316 [inline]
[<ffffffff85811b2e>] ip_local_deliver+0x2ea/0x568 net/ipv4/ip_input.c:260
[<ffffffff8580f9c6>] dst_input include/net/dst.h:471 [inline]
[<ffffffff8580f9c6>] ip_rcv_finish+0x1b0/0x2d2 net/ipv4/ip_input.c:454
[<ffffffff85811e82>] NF_HOOK include/linux/netfilter.h:318 [inline]
[<ffffffff85811e82>] NF_HOOK include/linux/netfilter.h:312 [inline]
[<ffffffff85811e82>] ip_rcv+0xd6/0x44e net/ipv4/ip_input.c:574
[<ffffffff851c8bc4>] __netif_receive_skb_one_core+0x106/0x16e net/core/dev.c:5979
[<ffffffff851c8e44>] __netif_receive_skb+0x2c/0x144 net/core/dev.c:6092
[<ffffffff851ca044>] process_backlog+0x4f6/0x1cb0 net/core/dev.c:6444
[<ffffffff851cd4ac>] __napi_poll.constprop.0+0xaa/0x4ba net/core/dev.c:7489
[<ffffffff851ce392>] napi_poll net/core/dev.c:7552 [inline]
[<ffffffff851ce392>] net_rx_action+0xad6/0xefe net/core/dev.c:7679
[<ffffffff8016778e>] handle_softirqs+0x4b2/0x132e kernel/softirq.c:579
[<ffffffff863ed7b0>] __do_softirq+0x12/0x1a kernel/softirq.c:613
[<ffffffff8006845c>] ___do_softirq+0x18/0x20 arch/riscv/kernel/irq.c:119
[<ffffffff863ed6fe>] call_on_irq_stack+0x32/0x40 arch/riscv/kernel/entry.S:360