rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P19317/1:b..l.. P17967/1:b..l..
rcu: (detected by 0, t=10502 jiffies, g=81977, q=971489 ncpus=2)
task:syz-executor state:R running task stack:21392 pid:17967 tgid:17967 ppid:17957 task_flags:0x400140 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5583 [inline]
__schedule+0x17dd/0x5820 kernel/sched/core.c:7382
preempt_schedule_irq+0x4b/0x90 kernel/sched/core.c:7662
irqentry_exit_to_kernel_mode include/linux/irq-entry-common.h:543 [inline]
irqentry_exit+0x14f/0x9b0 kernel/entry/common.c:154
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674
RIP: 0010:orc_ip arch/x86/kernel/unwind_orc.c:81 [inline]
RIP: 0010:__orc_find arch/x86/kernel/unwind_orc.c:103 [inline]
RIP: 0010:orc_find arch/x86/kernel/unwind_orc.c:238 [inline]
RIP: 0010:unwind_next_frame+0x4f4/0x2550 arch/x86/kernel/unwind_orc.c:510
Code: 89 c1 48 c1 f9 02 48 c1 e8 3f 48 01 c8 48 83 e0 fe 49 8d 1c 47 48 89 d8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df 0f b6 04 08 <84> c0 75 27 48 63 03 48 01 d8 48 8d 4b 04 48 39 e8 4c 0f 46 f9 48
RSP: 0018:ffffc900066bf4a0 EFLAGS: 00000a06
RAX: 0000000000000000 RBX: ffffffff91986a98 RCX: dffffc0000000000
RDX: ffffffff91986a98 RSI: ffffffff9219323e RDI: ffffffff8c6e1720
RBP: ffffffff81b30188 R08: 000000000000000b R09: 0000000000000000
R10: ffffc900066bf598 R11: ffffffff81b301f0 R12: ffffffff91986a9c
R13: ffffffff91986a98 R14: ffffc900066bf548 R15: ffffffff91986a98
arch_stack_walk+0x11b/0x150 arch/x86/kernel/stacktrace.c:25
stack_trace_save+0xa9/0x100 kernel/stacktrace.c:122
save_stack+0x122/0x230 mm/page_owner.c:183
__reset_page_owner+0x71/0x1f0 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_frozen_pages+0xc93/0xd90 mm/page_alloc.c:2962
__slab_free+0x274/0x2c0 mm/slub.c:5823
qlink_free mm/kasan/quarantine.c:163 [inline]
qlist_free_all+0x99/0x100 mm/kasan/quarantine.c:179
kasan_quarantine_reduce+0x148/0x160 mm/kasan/quarantine.c:286
__kasan_slab_alloc+0x22/0x80 mm/kasan/common.c:361
kasan_slab_alloc include/linux/kasan.h:253 [inline]
slab_post_alloc_hook mm/slub.c:4683 [inline]
slab_alloc_node mm/slub.c:4996 [inline]
kmem_cache_alloc_noprof+0x2b4/0x600 mm/slub.c:5010
lsm_file_alloc security/security.c:172 [inline]
security_file_alloc+0x34/0x310 security/security.c:2428
init_file+0x90/0x2b0 fs/file_table.c:184
alloc_empty_file+0x74/0x1d0 fs/file_table.c:266
path_openat+0x96/0x20f0 fs/namei.c:4996
do_file_open+0x23e/0x4a0 fs/namei.c:5039
do_sys_openat2+0x115/0x200 fs/open.c:1442
do_sys_open fs/open.c:1448 [inline]
__do_sys_openat fs/open.c:1464 [inline]
__se_sys_openat fs/open.c:1459 [inline]
__x64_sys_openat+0x138/0x170 fs/open.c:1459
do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f636959e87c
RSP: 002b:00007ffdc943dce0 EFLAGS: 00000206 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 000000000000008b RCX: 00007f636959e87c
RDX: 0000000000090800 RSI: 00007f6369636455 RDI: 00000000ffffff9c
RBP: 00007ffdc943dd8c R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000028
R13: 0000000000000000 R14: 000000000006f542 R15: 00007ffdc943dde0
task:syz.0.3414 state:R running task stack:25000 pid:19317 tgid:19317 ppid:17967 task_flags:0x400040 flags:0x00080002
Call Trace:
context_switch kernel/sched/core.c:5583 [inline]
__schedule+0x17dd/0x5820 kernel/sched/core.c:7382
preempt_schedule_common+0x7f/0xd0 kernel/sched/core.c:7561
preempt_schedule_thunk+0x16/0x40 arch/x86/entry/thunk.S:12
__local_bh_enable_ip+0xe9/0x140 kernel/softirq.c:480
spin_unlock_bh include/linux/spinlock.h:407 [inline]
cfg80211_mlme_unregister_socket+0x2c8/0x650 net/wireless/mlme.c:823
nl80211_netlink_notify+0x35d/0x860 net/wireless/nl80211.c:23893
notifier_call_chain+0x1a5/0x3d0 kernel/notifier.c:86
blocking_notifier_call_chain+0x6a/0x90 kernel/notifier.c:485
netlink_release+0x1211/0x1a90 net/netlink/af_netlink.c:759
__sock_release+0xa0/0x1f0 net/socket.c:735
sock_close+0x1c/0x30 net/socket.c:1529
__fput+0x408/0xa40 fs/file_table.c:512
fput_close_sync+0x11f/0x240 fs/file_table.c:618
filp_close_sync+0x6e/0xa0 fs/open.c:1573
__range_close fs/file.c:919 [inline]
__do_sys_close_range fs/file.c:1003 [inline]
__se_sys_close_range+0xa77/0xef0 fs/file.c:954
do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f636959f559
RSP: 002b:00007ffdc943db48 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: ffffffffffffffda RBX: 00007f6369827da0 RCX: 00007f636959f559
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 00007f6369827da0 R08: 0000000000000006 R09: 0000000000000000
R10: 00007f6369827cb0 R11: 0000000000000246 R12: 000000000006f2af
R13: 00007f636982618c R14: 000000000006f25f R15: 00007f6369826180
rcu: rcu_preempt kthread starved for 432 jiffies! g81977 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:27496 pid:16 tgid:16 ppid:2 task_flags:0x208040 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5583 [inline]
__schedule+0x17dd/0x5820 kernel/sched/core.c:7382
__schedule_loop kernel/sched/core.c:7459 [inline]
schedule+0x164/0x2b0 kernel/sched/core.c:7474
schedule_timeout+0x152/0x2c0 kernel/time/sleep_timeout.c:99
rcu_gp_fqs_loop+0x30c/0x1230 kernel/rcu/tree.c:2122
rcu_gp_kthread+0x9c/0x340 kernel/rcu/tree.c:2330
kthread+0x38b/0x480 kernel/kthread.c:436
ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
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: 7165 Comm: kworker/u8:25 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026
Workqueue: events_unbound cfg80211_wiphy_work
RIP: 0010:check_preemption_disabled+0x3/0xd0 lib/smp_processor_id.c:13
Code: 6e 8c 48 c7 c6 60 17 6e 8c eb 1c 66 66 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 55 41 57 <41> 56 53 65 8b 05 eb db a6 08 65 48 8b 0d bb db a6 08 85 c9 74 0c
RSP: 0018:ffffc90000a07800 EFLAGS: 00000046
RAX: 39529a686290c103 RBX: 0000000000000206 RCX: 0000000000000000
RDX: ffffc90000a07901 RSI: ffffffff8e70ff13 RDI: ffffffff8c6e1780
RBP: ffff8880565ccb20 R08: ffffc900037cfa80 R09: 0000000000000000
R10: ffffc90000a07978 R11: fffff52000140f31 R12: 0000000000000006
R13: 0000000000000006 R14: ffffffff8fd59ca0 R15: ffff8880565cbe80
FS: 0000000000000000(0000) GS:ffff888123b6b000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f5ac24c8ff8 CR3: 0000000077008000 CR4: 00000000003526f0
Call Trace:
lockdep_recursion_finish kernel/locking/lockdep.c:470 [inline]
lock_release+0x263/0x3c0 kernel/locking/lockdep.c:5966
rcu_lock_release include/linux/rcupdate.h:319 [inline]
rcu_read_unlock include/linux/rcupdate.h:880 [inline]
class_rcu_destructor include/linux/rcupdate.h:1216 [inline]
unwind_next_frame+0x1baa/0x2550 arch/x86/kernel/unwind_orc.c:709
arch_stack_walk+0x11b/0x150 arch/x86/kernel/stacktrace.c:25
stack_trace_save+0xa9/0x100 kernel/stacktrace.c:122
kasan_save_stack mm/kasan/common.c:57 [inline]
kasan_save_track+0x3e/0x80 mm/kasan/common.c:78
poison_kmalloc_redzone mm/kasan/common.c:409 [inline]
__kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:426
kasan_kmalloc include/linux/kasan.h:263 [inline]
__kmalloc_cache_noprof+0x31c/0x600 mm/slub.c:5563
_kmalloc_noprof include/linux/slab.h:991 [inline]
_kzalloc_noprof include/linux/slab.h:1312 [inline]
ref_tracker_alloc+0x221/0x530 lib/ref_tracker.c:270
__netdev_tracker_alloc include/linux/netdevice.h:4554 [inline]
netdev_hold include/linux/netdevice.h:4583 [inline]
dst_init+0xbe/0x470 net/core/dst.c:52
dst_alloc+0x12a/0x170 net/core/dst.c:94
rt_dst_alloc net/ipv4/route.c:1690 [inline]
__mkroute_output net/ipv4/route.c:2693 [inline]
ip_route_output_key_hash_rcu+0x14ac/0x2720 net/ipv4/route.c:2913
ip_route_output_key_hash+0x18d/0x2a0 net/ipv4/route.c:2743
__ip_route_output_key include/net/route.h:175 [inline]
ip_route_output_flow+0x2a/0x150 net/ipv4/route.c:2970
ip_route_output_key include/net/route.h:185 [inline]
ip_route_me_harder+0x762/0xfe0 net/ipv4/netfilter.c:54
synproxy_send_tcp+0x332/0x670 net/netfilter/nf_synproxy_core.c:434
synproxy_send_client_synack+0x89b/0xde0 net/netfilter/nf_synproxy_core.c:487
nft_synproxy_eval_v4+0x362/0x4e0 net/netfilter/nft_synproxy.c:59
nft_synproxy_do_eval+0x389/0x5d0 net/netfilter/nft_synproxy.c:142
expr_call_ops_eval net/netfilter/nf_tables_core.c:237 [inline]
nft_do_chain+0x48d/0x1b10 net/netfilter/nf_tables_core.c:285
nft_do_chain_ipv4+0x195/0x290 net/netfilter/nft_chain_filter.c:24
nf_hook_entry_hookfn include/linux/netfilter.h:165 [inline]
nf_hook_slow+0xc5/0x220 net/netfilter/core.c:633
nf_hook include/linux/netfilter.h:280 [inline]
NF_HOOK+0x21f/0x3c0 include/linux/netfilter.h:323
NF_HOOK+0x336/0x3c0 include/linux/netfilter.h:325
__netif_receive_skb_one_core net/core/dev.c:6422 [inline]
__netif_receive_skb net/core/dev.c:6535 [inline]
process_backlog+0xa6b/0x18b0 net/core/dev.c:6886
__napi_poll+0xaa/0x330 net/core/dev.c:7955
napi_poll net/core/dev.c:8018 [inline]
net_rx_action+0x61d/0xf50 net/core/dev.c:8175
handle_softirqs+0x265/0x8d0 kernel/softirq.c:669
do_softirq+0x77/0xd0 kernel/softirq.c:569
__local_bh_enable_ip+0x100/0x140 kernel/softirq.c:473
spin_unlock_bh include/linux/spinlock.h:407 [inline]
cfg80211_inform_single_bss_data+0x1491/0x1be0 net/wireless/scan.c:2463
cfg80211_inform_bss_data+0x25b/0x3be0 net/wireless/scan.c:3303
cfg80211_inform_bss_frame_data+0x51a/0xae0 net/wireless/scan.c:3399
ieee80211_bss_info_update+0x772/0xa30 net/mac80211/scan.c:236
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+0x1ce1/0x2c40 net/mac80211/ibss.c:1573
ieee80211_iface_process_skb net/mac80211/iface.c:1805 [inline]
ieee80211_iface_work+0x769/0xfa0 net/mac80211/iface.c:1859
cfg80211_wiphy_work+0x29e/0x420 net/wireless/core.c:610
process_one_work kernel/workqueue.c:3495 [inline]
process_scheduled_works+0xc3d/0x1630 kernel/workqueue.c:3578
worker_thread+0xa47/0xfb0 kernel/workqueue.c:3659
kthread+0x38b/0x480 kernel/kthread.c:436
ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245