rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P5598/1:b..l
rcu: 	(detected by 0, t=10503 jiffies, g=33341, q=4802 ncpus=2)
task:syz-executor    state:R  running task     stack:23144 pid:5598  tgid:5598  ppid:1      task_flags:0x40054c flags:0x00080003
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5533 [inline]
 __schedule+0x1259/0x6920 kernel/sched/core.c:7284
 preempt_schedule_irq+0x4e/0x90 kernel/sched/core.c:7606
 irqentry_exit_to_kernel_mode_preempt include/linux/irq-entry-common.h:468 [inline]
 irqentry_exit_to_kernel_mode include/linux/irq-entry-common.h:539 [inline]
 irqentry_exit+0x205/0xa10 kernel/entry/common.c:167
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674
RIP: 0010:lock_acquire+0x5e/0x380 kernel/locking/lockdep.c:5947
Code: 05 8f 1e a6 13 83 f8 07 0f 87 da 00 00 00 48 0f a3 05 9e e6 5d 10 0f 82 c9 02 00 00 8b 35 3e 18 5e 10 85 f6 0f 85 c7 00 00 00 <48> 8b 44 24 30 65 48 2b 05 2d 1e a6 13 0f 85 09 03 00 00 48 83 c4
RSP: 0018:ffffc9000320f510 EFLAGS: 00000206
RAX: 0000000000000046 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff8e3bd2c3 RDI: ffffffff8c625580
RBP: ffffffff8fdec5e0 R08: 00000000ef9d33e4 R09: 0000000000000007
R10: 0000000000000200 R11: 0000000000000000 R12: 0000000000000002
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
 rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
 rcu_read_lock include/linux/rcupdate.h:849 [inline]
 class_rcu_constructor include/linux/rcupdate.h:1216 [inline]
 unwind_next_frame+0xd1/0x2090 arch/x86/kernel/unwind_orc.c:495
 arch_stack_walk+0x94/0xf0 arch/x86/kernel/stacktrace.c:25
 stack_trace_save+0x8e/0xc0 kernel/stacktrace.c:122
 save_stack+0x162/0x1e0 mm/page_owner.c:183
 __reset_page_owner+0x84/0x190 mm/page_owner.c:338
 reset_page_owner include/linux/page_owner.h:26 [inline]
 __free_pages_prepare mm/page_alloc.c:1418 [inline]
 free_pages_prepare+0x586/0xe00 mm/page_alloc.c:1463
 __free_contig_range_common+0x14f/0x250 mm/page_alloc.c:7072
 __free_contig_range mm/page_alloc.c:7117 [inline]
 free_pages_bulk+0x12a/0x200 mm/page_alloc.c:5322
 vm_area_free_pages+0xb2/0x2a0 mm/vmalloc.c:3461
 vfree mm/vmalloc.c:3510 [inline]
 vfree+0xf7/0x6d0 mm/vmalloc.c:3484
 kcov_put kernel/kcov.c:449 [inline]
 kcov_put kernel/kcov.c:445 [inline]
 kcov_close+0x34/0x60 kernel/kcov.c:556
 __fput+0x400/0xb60 fs/file_table.c:512
 task_work_run+0x150/0x240 kernel/task_work.c:233
 exit_task_work include/linux/task_work.h:40 [inline]
 do_exit+0x8da/0x2a50 kernel/exit.c:986
 do_group_exit+0xd5/0x2a0 kernel/exit.c:1129
 get_signal+0x1ec7/0x21e0 kernel/signal.c:3112
 arch_do_signal_or_restart+0x91/0x7e0 arch/x86/kernel/signal.c:337
 __exit_to_user_mode_loop kernel/entry/common.c:66 [inline]
 exit_to_user_mode_loop+0x139/0x700 kernel/entry/common.c:101
 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline]
 syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:230 [inline]
 syscall_exit_to_user_mode include/linux/entry-common.h:343 [inline]
 do_syscall_64+0x661/0x790 arch/x86/entry/syscall_64.c:89
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7efde9b5ed8e
RSP: 002b:00007ffd154e8848 EFLAGS: 00000246 ORIG_RAX: 000000000000003d
RAX: fffffffffffffe00 RBX: 000055555e8c5500 RCX: 00007efde9b5ed8e
RDX: 0000000040000000 RSI: 00007ffd154e88ec RDI: ffffffffffffffff
RBP: 00007ffd154e88ec R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000000008f
R13: 000055555e8d8a10 R14: 000000000004e160 R15: 00007ffd154e8940
 </TASK>
rcu: rcu_preempt kthread starved for 2271 jiffies! g33341 f0x0 RCU_GP_WAIT_FQS(5) ->state=R ->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:28984 pid:17    tgid:17    ppid:2      task_flags:0x208040 flags:0x00080000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5533 [inline]
 __schedule+0x1259/0x6920 kernel/sched/core.c:7284
 __schedule_loop kernel/sched/core.c:7361 [inline]
 schedule+0xdd/0x2c0 kernel/sched/core.c:7376
 schedule_timeout+0x127/0x280 kernel/time/sleep_timeout.c:99
 rcu_gp_fqs_loop+0x1a9/0x8f0 kernel/rcu/tree.c:2122
 rcu_gp_kthread+0x17a/0x220 kernel/rcu/tree.c:2330
 kthread+0x373/0x450 kernel/kthread.c:436
 ret_from_fork+0x730/0xd60 arch/x86/kernel/process.c:158
 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: 43 Comm: kworker/u8:2 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/05/2026
Workqueue: events_unbound cfg80211_wiphy_work
RIP: 0010:unwind_get_return_address+0x4e/0xa0 arch/x86/kernel/unwind_orc.c:385
Code: 7e 59 8b 03 85 c0 75 09 31 c0 5b 5d c3 cc cc cc cc 48 b8 00 00 00 00 00 fc ff df 48 8d 6b 48 48 89 ea 48 c1 ea 03 80 3c 02 00 <75> 36 48 8b 7b 48 e8 17 de 18 00 85 c0 74 cf 48 b8 00 00 00 00 00
RSP: 0018:ffffc90000a17b30 EFLAGS: 00000246
RAX: dffffc0000000000 RBX: ffffc90000a17b48 RCX: ffffc90000a17a9c
RDX: 1ffff92000142f72 RSI: ffffffff8e3bd2c3 RDI: ffffc90000a17b48
RBP: ffffc90000a17b90 R08: 0000000000000001 R09: 0000000000000007
R10: 0000000000000200 R11: 0000000000018b50 R12: ffffffff81f620c0
R13: ffffc90000a17c08 R14: 0000000000000000 R15: ffff888021ed2580
FS:  0000000000000000(0000) GS:ffff888122a46000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffe0faa0ac0 CR3: 000000000fb96000 CR4: 00000000003526f0
Call Trace:
 <IRQ>
 arch_stack_walk+0xa6/0xf0 arch/x86/kernel/stacktrace.c:26
 stack_trace_save+0x8e/0xc0 kernel/stacktrace.c:122
 save_stack+0x162/0x1e0 mm/page_owner.c:183
 __set_page_owner+0x8c/0x540 mm/page_owner.c:359
 set_page_owner include/linux/page_owner.h:33 [inline]
 post_alloc_hook+0xfd/0x120 mm/page_alloc.c:1871
 prep_new_page mm/page_alloc.c:1879 [inline]
 get_page_from_freelist+0x110d/0x35d0 mm/page_alloc.c:3943
 __alloc_frozen_pages_noprof+0x2eb/0x3300 mm/page_alloc.c:5436
 alloc_slab_page mm/slub.c:3347 [inline]
 allocate_slab mm/slub.c:3462 [inline]
 new_slab+0xa9/0x6e0 mm/slub.c:3513
 refill_objects+0xe3/0x410 mm/slub.c:7418
 refill_sheaf mm/slub.c:2885 [inline]
 __pcs_replace_empty_main+0x35e/0x650 mm/slub.c:4774
 alloc_from_pcs mm/slub.c:4850 [inline]
 slab_alloc_node mm/slub.c:4984 [inline]
 kmem_cache_alloc_node_noprof+0x4f2/0x6e0 mm/slub.c:5068
 kmalloc_reserve+0x148/0x350 net/core/skbuff.c:615
 __alloc_skb+0x185/0x710 net/core/skbuff.c:715
 alloc_skb include/linux/skbuff.h:1384 [inline]
 synproxy_send_client_synack_ipv6+0x19f/0x7a0 net/netfilter/nf_synproxy_core.c:883
 nft_synproxy_eval_v6 net/netfilter/nft_synproxy.c:90 [inline]
 nft_synproxy_do_eval+0x95f/0xd30 net/netfilter/nft_synproxy.c:146
 expr_call_ops_eval net/netfilter/nf_tables_core.c:237 [inline]
 nft_do_chain+0x2e5/0x19d0 net/netfilter/nf_tables_core.c:285
 nft_do_chain_inet+0xf3/0x400 net/netfilter/nft_chain_filter.c:162
 nf_hook_entry_hookfn include/linux/netfilter.h:165 [inline]
 nf_hook_slow+0xbf/0x220 net/netfilter/core.c:619
 nf_hook.constprop.0+0x2a6/0x750 include/linux/netfilter.h:280
 NF_HOOK include/linux/netfilter.h:323 [inline]
 ip6_input+0xe0/0x2f0 net/ipv6/ip6_input.c:545
 dst_input include/net/dst.h:481 [inline]
 ip6_rcv_finish net/ipv6/ip6_input.c:119 [inline]
 NF_HOOK include/linux/netfilter.h:325 [inline]
 NF_HOOK include/linux/netfilter.h:319 [inline]
 ipv6_rcv+0x263/0x3d0 net/ipv6/ip6_input.c:351
 __netif_receive_skb_one_core+0x12d/0x1e0 net/core/dev.c:6297
 __netif_receive_skb+0x1f/0x120 net/core/dev.c:6410
 process_backlog+0x487/0x1600 net/core/dev.c:6761
 __napi_poll.constprop.0+0xaf/0x450 net/core/dev.c:7830
 napi_poll net/core/dev.c:7893 [inline]
 net_rx_action+0xa40/0xf20 net/core/dev.c:8050
 handle_softirqs+0x1e6/0x9d0 kernel/softirq.c:645
 do_softirq kernel/softirq.c:546 [inline]
 do_softirq+0xaf/0xf0 kernel/softirq.c:533
 </IRQ>
 <TASK>
 __local_bh_enable_ip+0xff/0x120 kernel/softirq.c:473
 spin_unlock_bh include/linux/spinlock.h:407 [inline]
 cfg80211_inform_single_bss_data+0x959/0x1dc0 net/wireless/scan.c:2462
 cfg80211_inform_bss_data+0x230/0x3c20 net/wireless/scan.c:3302
 cfg80211_inform_bss_frame_data+0x245/0x7c0 net/wireless/scan.c:3394
 ieee80211_bss_info_update+0x310/0xab0 net/mac80211/scan.c:230
 ieee80211_rx_bss_info net/mac80211/ibss.c:1065 [inline]
 ieee80211_rx_mgmt_probe_beacon net/mac80211/ibss.c:1546 [inline]
 ieee80211_ibss_rx_queued_mgmt+0xe04/0x1c70 net/mac80211/ibss.c:1573
 ieee80211_iface_process_skb net/mac80211/iface.c:1809 [inline]
 ieee80211_iface_work+0xa9a/0x1070 net/mac80211/iface.c:1863
 cfg80211_wiphy_work+0x2b7/0x550 net/wireless/core.c:564
 process_one_work+0xac7/0x1b10 kernel/workqueue.c:3396
 process_scheduled_works kernel/workqueue.c:3479 [inline]
 worker_thread+0x5ef/0xe50 kernel/workqueue.c:3560
 kthread+0x373/0x450 kernel/kthread.c:436
 ret_from_fork+0x730/0xd60 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>