INFO: task syz.2.763:6456 blocked for more than 430 seconds.
      Not tainted 6.14.0-rc1-syzkaller-g245aece3750d #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.2.763       state:D stack:0     pid:6456  tgid:6456  ppid:5234   task_flags:0x400040 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
[<ffffffff86249518>] schedule_preempt_disabled+0x16/0x28 kernel/sched/core.c:6913
[<ffffffff8624d014>] __mutex_lock_common kernel/locking/mutex.c:662 [inline]
[<ffffffff8624d014>] __mutex_lock+0x9b2/0x1230 kernel/locking/mutex.c:730
[<ffffffff8624d8a6>] mutex_lock_nested+0x14/0x1c kernel/locking/mutex.c:782
[<ffffffff8036805c>] rcu_barrier+0x56/0x6cc kernel/rcu/tree.c:3741
[<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
[<ffffffff8623c566>] resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
[<ffffffff8623c566>] exit_to_user_mode_loop kernel/entry/common.c:114 [inline]
[<ffffffff8623c566>] exit_to_user_mode_prepare include/linux/entry-common.h:329 [inline]
[<ffffffff8623c566>] __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
[<ffffffff8623c566>] syscall_exit_to_user_mode+0x290/0x2a4 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:
2 locks held by kworker/0:0/8:
1 lock held by kworker/R-mm_pe/13:
3 locks held by kworker/u10:1/31:
 #0: ffffaf8011a89148 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x848/0x1f3a kernel/workqueue.c:3211
 #1: ffff8f8000217bd0 ((work_completion)(&map->work)){+.+.}-{0:0}, at: process_one_work+0x870/0x1f3a kernel/workqueue.c:3211
 #2: ffffffff883e7d00 (rcu_state.barrier_mutex){+.+.}-{4:4}, at: rcu_barrier+0x56/0x6cc kernel/rcu/tree.c:3741
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 kworker/0:2/919:
1 lock held by klogd/2994:
2 locks held by getty/3145:
 #0: ffffaf801cec20a0 (&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 syz-executor/3171:
2 locks held by kworker/0:1/3749:
3 locks held by kworker/u10:4/4254:
1 lock held by kworker/R-wg-cr/5380:
 #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/5383:
 #0: ffffffff8828d768 (wq_pool_attach_mutex){+.+.}-{4:4}, at: worker_attach_to_pool+0x36/0x3c4 kernel/workqueue.c:2676
1 lock held by kworker/R-wg-cr/5387:
 #0: ffffffff8828d768 (wq_pool_attach_mutex){+.+.}-{4:4}, at: worker_attach_to_pool+0x36/0x3c4 kernel/workqueue.c:2676
2 locks held by kworker/0:3/5887:
2 locks held by kworker/0:4/5996:
2 locks held by kworker/0:5/6196:
5 locks held by kworker/u10:0/6199:
2 locks held by kworker/0:7/6211:
4 locks held by kworker/0:8/6214:
1 lock held by syz.1.740/6217:
 #0: ffffffff883e7d00 (rcu_state.barrier_mutex){+.+.}-{4:4}, at: rcu_barrier+0x56/0x6cc kernel/rcu/tree.c:3741
3 locks held by kworker/0:9/6229:
3 locks held by kworker/u10:6/6230:
3 locks held by syz-executor/6247:
1 lock held by kworker/R-wg-cr/6362:
 #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
2 locks held by kworker/0:10/6363:
1 lock held by kworker/R-wg-cr/6366:
 #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/6369:
 #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 syz.2.763/6456:
 #0: ffffffff883e7d00 (rcu_state.barrier_mutex){+.+.}-{4:4}, at: rcu_barrier+0x56/0x6cc kernel/rcu/tree.c:3741
2 locks held by syz-executor/6588:
2 locks held by kworker/0:11/6944:

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

NMI backtrace for cpu 1
CPU: 1 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 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 16 Comm: ksoftirqd/0 Not tainted 6.14.0-rc1-syzkaller-g245aece3750d #0
Hardware name: riscv-virtio,qemu (DT)
epc : walk_stackframe+0xc4/0x474 arch/riscv/kernel/stacktrace.c:58
 ra : walk_stackframe+0xc4/0x474 arch/riscv/kernel/stacktrace.c:58
epc : ffffffff80073da6 ra : ffffffff80073da6 sp : ffff8f8000116450
 gp : ffffffff89c21d80 tp : ffffaf801328ce00 t0 : ffff8f80001167a0
 t1 : ffffaf801328d940 t2 : 0000000000000005 s0 : ffff8f80001164d0
 s1 : ffff8f80001164e0 a0 : 0000000000000001 a1 : ffffffff8623b584
 a2 : 0000000000f00000 a3 : ffffffff80073d9c a4 : 0000000000000000
 a5 : ffffffff86261374 a6 : 0000000000f00000 a7 : 000000001471ee82
 s2 : ffff8f80001164d0 s3 : 0000000000000000 s4 : 0000000000000000
 s5 : dfffffff00000000 s6 : ffffffff8623b584 s7 : ffff8f80001164e0
 s8 : dfffffff00000000 s9 : 0000000000007fff s10: ffffffff86261034
 s11: 0000000000000007 t3 : ffffaf801328d8f0 t4 : 1ffff5f002651b1d
 t5 : 1ffff5f002651b2c t6 : 0000000000000009
status: 0000000200000120 badaddr: 0000000000000000 cause: 8000000000000001
[<ffffffff80073da6>] walk_stackframe+0xc4/0x474 arch/riscv/kernel/stacktrace.c:58
[<ffffffff8623b584>] arch_stack_walk+0x1c/0x24 arch/riscv/kernel/stacktrace.c:165
[<ffffffff803c28b2>] stack_trace_save+0xa0/0xd2 kernel/stacktrace.c:122
[<ffffffff80a68b7e>] kasan_save_stack+0x3e/0x6a mm/kasan/common.c:47
[<ffffffff80a68bd4>] kasan_save_track+0x16/0x28 mm/kasan/common.c:68
[<ffffffff80a6b886>] kasan_save_alloc_info+0x30/0x3e mm/kasan/generic.c:562
[<ffffffff80a68f96>] unpoison_slab_object mm/kasan/common.c:319 [inline]
[<ffffffff80a68f96>] __kasan_slab_alloc+0x7c/0x82 mm/kasan/common.c:345
[<ffffffff809cc91e>] kasan_slab_alloc include/linux/kasan.h:250 [inline]
[<ffffffff809cc91e>] slab_post_alloc_hook mm/slub.c:4115 [inline]
[<ffffffff809cc91e>] slab_alloc_node mm/slub.c:4164 [inline]
[<ffffffff809cc91e>] kmem_cache_alloc_noprof+0x108/0x3e2 mm/slub.c:4171
[<ffffffff84fb23b6>] dst_alloc+0x94/0x174 net/core/dst.c:89
[<ffffffff8558ea18>] rt_dst_alloc+0x3a/0x340 net/ipv4/route.c:1626
[<ffffffff855a7232>] __mkroute_output net/ipv4/route.c:2620 [inline]
[<ffffffff855a7232>] ip_route_output_key_hash_rcu+0x822/0x2748 net/ipv4/route.c:2842
[<ffffffff855a92b0>] ip_route_output_key_hash+0x158/0x31c net/ipv4/route.c:2671
[<ffffffff855a9e5e>] __ip_route_output_key include/net/route.h:169 [inline]
[<ffffffff855a9e5e>] ip_route_output_flow+0x2a/0x142 net/ipv4/route.c:2899
[<ffffffff8584a180>] ip_route_output_key include/net/route.h:179 [inline]
[<ffffffff8584a180>] ip_route_me_harder+0x52e/0x11a6 net/ipv4/netfilter.c:53
[<ffffffff85453504>] synproxy_send_tcp.isra.0+0x2be/0x5d2 net/netfilter/nf_synproxy_core.c:431
[<ffffffff85455448>] synproxy_send_client_synack+0x6dc/0x8be net/netfilter/nf_synproxy_core.c:484
[<ffffffff8552bb70>] nft_synproxy_eval_v4 net/netfilter/nft_synproxy.c:59 [inline]
[<ffffffff8552bb70>] nft_synproxy_do_eval+0x8ac/0xa52 net/netfilter/nft_synproxy.c:141
[<ffffffff8552bd74>] nft_synproxy_eval+0x28/0x36 net/netfilter/nft_synproxy.c:247
[<ffffffff85460a3a>] expr_call_ops_eval net/netfilter/nf_tables_core.c:240 [inline]
[<ffffffff85460a3a>] nft_do_chain+0x328/0x1598 net/netfilter/nf_tables_core.c:288
[<ffffffff854bb04c>] nft_do_chain_inet+0x180/0x316 net/netfilter/nft_chain_filter.c:161
[<ffffffff85395d24>] nf_hook_entry_hookfn include/linux/netfilter.h:154 [inline]
[<ffffffff85395d24>] nf_hook_slow+0xb8/0x1ec net/netfilter/core.c:626
[<ffffffff855b6556>] nf_hook include/linux/netfilter.h:269 [inline]
[<ffffffff855b6556>] NF_HOOK include/linux/netfilter.h:312 [inline]
[<ffffffff855b6556>] ip_local_deliver+0x2ea/0x568 net/ipv4/ip_input.c:254
[<ffffffff855b460a>] dst_input include/net/dst.h:469 [inline]
[<ffffffff855b460a>] ip_rcv_finish+0x1b0/0x2d2 net/ipv4/ip_input.c:447
[<ffffffff855b68aa>] NF_HOOK include/linux/netfilter.h:314 [inline]
[<ffffffff855b68aa>] NF_HOOK include/linux/netfilter.h:308 [inline]
[<ffffffff855b68aa>] ip_rcv+0xd6/0x44e 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
[<ffffffff801579bc>] run_ksoftirqd kernel/softirq.c:950 [inline]
[<ffffffff801579bc>] run_ksoftirqd+0xce/0x144 kernel/softirq.c:942
[<ffffffff801e9f8e>] smpboot_thread_fn+0x654/0xb96 kernel/smpboot.c:164
[<ffffffff801d3ae2>] kthread+0x37e/0x7b6 kernel/kthread.c:464
[<ffffffff86261292>] ret_from_fork+0xe/0x18 arch/riscv/kernel/entry.S:327