rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P15009/1:b..l P15016/1:b..l
rcu: 	(detected by 0, t=10503 jiffies, g=65673, q=1356179 ncpus=2)
task:syz.5.2308      state:R  running task     stack:25960 pid:15016 tgid:15016 ppid:8768   task_flags:0x40044c flags:0x00004006
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5382 [inline]
 __schedule+0x1b33/0x51f0 kernel/sched/core.c:6767
 preempt_schedule_irq+0xfe/0x1c0 kernel/sched/core.c:7090
 irqentry_exit+0x5e/0x90 kernel/entry/common.c:354
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:kasan_check_range+0xc/0x2a0 mm/kasan/generic.c:188
Code: 0f 0b cc cc cc cc cc cc cc cc cc cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 66 0f 1f 00 55 41 57 41 56 41 54 53 <b0> 01 48 85 f6 0f 84 a0 01 00 00 4c 8d 04 37 49 39 f8 0f 82 63 02
RSP: 0018:ffffc9000edff0f8 EFLAGS: 00000246
RAX: ffffc9000edff728 RBX: 0000000000000010 RCX: ffffffff816da656
RDX: 0000000000000001 RSI: 0000000000000010 RDI: ffffc9000edff270
RBP: ffffc9000edff270 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffffc9000edff220
R13: ffffc9000ee00000 R14: 0000000000000000 R15: ffffc9000edf8000
 __asan_memset+0x23/0x50 mm/kasan/shadow.c:84
 unwind_next_frame+0xb46/0x23b0 arch/x86/kernel/unwind_orc.c:592
 arch_stack_walk+0x11e/0x150 arch/x86/kernel/stacktrace.c:25
 stack_trace_save+0x11a/0x1d0 kernel/stacktrace.c:122
 kasan_save_stack+0x3f/0x60 mm/kasan/common.c:47
 kasan_record_aux_stack+0xbf/0xd0 mm/kasan/generic.c:548
 __call_rcu_common kernel/rcu/tree.c:3082 [inline]
 call_rcu+0x172/0xad0 kernel/rcu/tree.c:3202
 slab_free_hook mm/slub.c:2362 [inline]
 slab_free mm/slub.c:4656 [inline]
 kmem_cache_free+0x312/0x410 mm/slub.c:4758
 exit_mmap+0x73e/0xde0 mm/mmap.c:1309
 __mmput+0x115/0x410 kernel/fork.c:1379
 exit_mm+0x221/0x310 kernel/exit.c:589
 do_exit+0x994/0x27f0 kernel/exit.c:940
 do_group_exit+0x207/0x2c0 kernel/exit.c:1102
 get_signal+0x1696/0x1730 kernel/signal.c:3034
 arch_do_signal_or_restart+0x98/0x810 arch/x86/kernel/signal.c:337
 exit_to_user_mode_loop kernel/entry/common.c:111 [inline]
 exit_to_user_mode_prepare include/linux/entry-common.h:329 [inline]
 __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
 syscall_exit_to_user_mode+0xce/0x340 kernel/entry/common.c:218
 do_syscall_64+0x100/0x210 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f28f098e169
RSP: 002b:00007ffd80ba8a48 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: ffffffffffffff92 RBX: 000000000010ad7f RCX: 00007f28f098e169
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f28f0bb5fac
RBP: 0000000000000032 R08: 7fffffffffffffff R09: 0000000b80ba8d3f
R10: 00007ffd80ba8b40 R11: 0000000000000246 R12: 00007f28f0bb5fac
R13: 00007ffd80ba8b40 R14: 000000000010adb1 R15: 00007ffd80ba8b60
 </TASK>
task:syz.6.2306      state:R  running task     stack:23560 pid:15009 tgid:15009 ppid:10271  task_flags:0x400040 flags:0x00000004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5382 [inline]
 __schedule+0x1b33/0x51f0 kernel/sched/core.c:6767
 preempt_schedule_common+0x84/0xd0 kernel/sched/core.c:6947
 preempt_schedule+0xe4/0xf0 kernel/sched/core.c:6971
 preempt_schedule_thunk+0x16/0x30 arch/x86/entry/thunk.S:12
 __local_bh_enable_ip+0x179/0x200 kernel/softirq.c:414
 nl80211_netlink_notify+0x452/0x840 net/wireless/nl80211.c:20270
 notifier_call_chain+0x1a5/0x3f0 kernel/notifier.c:85
 blocking_notifier_call_chain+0x69/0x90 kernel/notifier.c:380
 netlink_release+0x11d9/0x1b80 net/netlink/af_netlink.c:764
 __sock_release net/socket.c:647 [inline]
 sock_close+0xbc/0x240 net/socket.c:1391
 __fput+0x3e9/0x9f0 fs/file_table.c:465
 task_work_run+0x251/0x310 kernel/task_work.c:227
 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:114 [inline]
 exit_to_user_mode_prepare include/linux/entry-common.h:329 [inline]
 __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
 syscall_exit_to_user_mode+0x13f/0x340 kernel/entry/common.c:218
 do_syscall_64+0x100/0x210 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7faf0d18e169
RSP: 002b:00007fffe83acf08 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: 0000000000000000 RBX: 00007faf0d3b7ba0 RCX: 00007faf0d18e169
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 00007faf0d3b7ba0 R08: 0000000000000234 R09: 0000001ae83ad1ff
R10: 00007faf0d3b7ac0 R11: 0000000000000246 R12: 000000000010aac5
R13: 00007faf0d3b6160 R14: ffffffffffffffff R15: 00007fffe83ad020
 </TASK>
rcu: rcu_preempt kthread starved for 999 jiffies! g65673 f0x2 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=1
rcu: 	Unless rcu_preempt kthread gets sufficient CPU time, OOM is now expected behavior.
rcu: RCU grace-period kthread stack dump:
task:rcu_preempt     state:R  running task     stack:26688 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5382 [inline]
 __schedule+0x1b33/0x51f0 kernel/sched/core.c:6767
 __schedule_loop kernel/sched/core.c:6845 [inline]
 schedule+0x163/0x360 kernel/sched/core.c:6860
 schedule_timeout+0x15b/0x2b0 kernel/time/sleep_timeout.c:99
 rcu_gp_fqs_loop+0x2e1/0x1340 kernel/rcu/tree.c:2046
 rcu_gp_kthread+0xa7/0x3b0 kernel/rcu/tree.c:2248
 kthread+0x7b7/0x940 kernel/kthread.c:464
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:153
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 36 Comm: kworker/u8:2 Not tainted 6.15.0-rc3-syzkaller-00001-g9d7a0577c9db #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Workqueue: wg-kex-wg0 wg_packet_handshake_send_worker
RIP: 0010:__sanitizer_cov_trace_pc+0x0/0x70 kernel/kcov.c:210
Code: 89 fb e8 23 00 00 00 48 8b 3d f4 b7 b5 0c 48 89 de 5b e9 03 36 5c 00 cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 <f3> 0f 1e fa 48 8b 04 24 65 48 8b 0c 25 08 10 65 93 65 8b 15 b8 53
RSP: 0018:ffffc90000a07698 EFLAGS: 00000202
RAX: 0000000000000010 RBX: 000000000020105f RCX: ffff8881442f1e00
RDX: ffff8881442f1e00 RSI: 0000000000000010 RDI: 0000000000000000
RBP: ffffc90000a07cd8 R08: ffffffff89e0a0e7 R09: 0000000000000000
R10: ffffc90000a078c0 R11: fffff52000140f1a R12: dffffc0000000000
R13: 0000000000000001 R14: 0000000000000014 R15: ffffc90000a07d48
FS:  0000000000000000(0000) GS:ffff8881250cf000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fff43c7c76c CR3: 000000007cfe6000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 skb_flow_dissector_target net/core/flow_dissector.c:-1 [inline]
 __skb_flow_dissect_ports net/core/flow_dissector.c:861 [inline]
 __skb_flow_dissect+0x3b99/0x7b10 net/core/flow_dissector.c:1665
 __xfrm_decode_session+0xd4/0xff0 net/xfrm/xfrm_policy.c:3505
 xfrm_decode_session include/net/xfrm.h:1333 [inline]
 ip_route_me_harder+0xaf0/0x13e0 net/ipv4/netfilter.c:66
 synproxy_send_tcp+0x356/0x6c0 net/netfilter/nf_synproxy_core.c:431
 synproxy_send_client_synack+0x8ea/0xf70 net/netfilter/nf_synproxy_core.c:484
 nft_synproxy_eval_v4+0x3cc/0x610 net/netfilter/nft_synproxy.c:59
 nft_synproxy_do_eval+0x36a/0xa90 net/netfilter/nft_synproxy.c:141
 expr_call_ops_eval net/netfilter/nf_tables_core.c:237 [inline]
 nft_do_chain+0x4b2/0x1db0 net/netfilter/nf_tables_core.c:285
 nft_do_chain_inet+0x41f/0x6b0 net/netfilter/nft_chain_filter.c:161
 nf_hook_entry_hookfn include/linux/netfilter.h:154 [inline]
 nf_hook_slow+0xc8/0x220 net/netfilter/core.c:626
 nf_hook include/linux/netfilter.h:269 [inline]
 NF_HOOK+0x29b/0x450 include/linux/netfilter.h:312
 NF_HOOK+0x3a0/0x450 include/linux/netfilter.h:314
 __netif_receive_skb_one_core net/core/dev.c:5887 [inline]
 __netif_receive_skb+0x2c9/0x670 net/core/dev.c:6000
 process_backlog+0x664/0x15c0 net/core/dev.c:6352
 __napi_poll+0xcb/0x480 net/core/dev.c:7324
 napi_poll net/core/dev.c:7388 [inline]
 net_rx_action+0x89d/0x1240 net/core/dev.c:7510
 handle_softirqs+0x2d6/0x9b0 kernel/softirq.c:579
 do_softirq+0x11f/0x1e0 kernel/softirq.c:480
 </IRQ>
 <TASK>
 __local_bh_enable_ip+0x1be/0x200 kernel/softirq.c:407
 local_bh_enable include/linux/bottom_half.h:33 [inline]
 fpregs_unlock arch/x86/include/asm/fpu/api.h:77 [inline]
 kernel_fpu_end+0x103/0x150 arch/x86/kernel/fpu/core.c:460
 blake2s_compress+0x5f/0xd0 arch/x86/crypto/blake2s-glue.c:49
 blake2s_update+0x135/0x420 lib/crypto/blake2s.c:32
 hmac+0x669/0x9d0 drivers/net/wireguard/noise.c:332
 kdf+0x129/0x3a0 drivers/net/wireguard/noise.c:367
 mix_precomputed_dh drivers/net/wireguard/noise.c:426 [inline]
 wg_noise_handshake_create_initiation+0x584/0xcb0 drivers/net/wireguard/noise.c:560
 wg_packet_send_handshake_initiation drivers/net/wireguard/send.c:34 [inline]
 wg_packet_handshake_send_worker+0x16b/0x330 drivers/net/wireguard/send.c:51
 process_one_work kernel/workqueue.c:3238 [inline]
 process_scheduled_works+0xac3/0x18e0 kernel/workqueue.c:3319
 worker_thread+0x870/0xd50 kernel/workqueue.c:3400
 kthread+0x7b7/0x940 kernel/kthread.c:464
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:153
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>