rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	1-...!: (1 ticks this GP) idle=bebc/1/0x4000000000000000 softirq=23391/23391 fqs=1
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P6389/1:b..l
rcu: 	(detected by 0, t=10503 jiffies, g=19261, q=1671 ncpus=2)
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 1158 Comm: kworker/u8:6 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/24/2026
Workqueue: events_unbound cfg80211_wiphy_work
RIP: 0010:llist_empty include/linux/llist.h:218 [inline]
RIP: 0010:__netif_schedule+0x34/0x200 net/core/dev.c:3394
Code: 55 41 54 53 50 48 89 fb 49 bd 00 00 00 00 00 fc ff df e8 ff 37 52 f8 4c 8d b3 08 02 00 00 4c 89 f0 48 c1 e8 03 42 80 3c 28 00 <74> 08 4c 89 f7 e8 92 99 bb f8 49 83 3e 00 74 0a e8 d7 37 52 f8 e9
RSP: 0018:ffffc90000a08c30 EFLAGS: 00000046
RAX: 1ffff11006db0e41 RBX: ffff888036d87000 RCX: ffff888028ff1e40
RDX: 0000000000010000 RSI: ffffffff8c276fe0 RDI: ffff888036d87000
RBP: 0000000000000001 R08: ffffffff89add408 R09: ffffffff8e760160
R10: dffffc0000000000 R11: ffffed1006db0e56 R12: ffff888036d87320
R13: dffffc0000000000 R14: ffff888036d87208 R15: ffff888076bf8000
FS:  0000000000000000(0000) GS:ffff888125396000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000562506f76a38 CR3: 000000000e54c000 CR4: 00000000003526f0
Call Trace:
 <IRQ>
 advance_sched+0xa9a/0xc90 net/sched/sch_taprio.c:992
 __run_hrtimer kernel/time/hrtimer.c:1785 [inline]
 __hrtimer_run_queues+0x529/0xc30 kernel/time/hrtimer.c:1849
 hrtimer_interrupt+0x42b/0x1010 kernel/time/hrtimer.c:1911
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1045 [inline]
 __sysvec_apic_timer_interrupt+0x102/0x3d0 arch/x86/kernel/apic/apic.c:1062
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1056 [inline]
 sysvec_apic_timer_interrupt+0xa1/0xc0 arch/x86/kernel/apic/apic.c:1056
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:lock_acquire+0x221/0x330 kernel/locking/lockdep.c:5872
Code: ff ff ff e8 01 2d 01 0a f7 44 24 08 00 02 00 00 0f 84 3a ff ff ff 65 48 8b 05 1b 8d 77 11 48 3b 44 24 58 75 33 fb 48 83 c4 60 <5b> 41 5c 41 5d 41 5e 41 5f 5d e9 40 0f 04 0a cc 48 8d 3d 38 37 73
RSP: 0018:ffffc90003dae918 EFLAGS: 00000286
RAX: 4aa928bdc39ea900 RBX: 0000000000000000 RCX: 0000000080000201
RDX: 000000000b02f63c RSI: ffffffff8e158d9b RDI: ffffffff8c277000
RBP: ffffffff81763295 R08: ffffffff81763295 R09: ffffffff8e760160
R10: ffffc90003daea78 R11: ffffffff81b02c90 R12: 0000000000000002
R13: ffffffff8e760160 R14: 0000000000000000 R15: 0000000000000246
 rcu_lock_acquire include/linux/rcupdate.h:312 [inline]
 rcu_read_lock include/linux/rcupdate.h:850 [inline]
 class_rcu_constructor include/linux/rcupdate.h:1193 [inline]
 unwind_next_frame+0xc2/0x23c0 arch/x86/kernel/unwind_orc.c:495
 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
 kasan_save_free_info+0x46/0x50 mm/kasan/generic.c:584
 poison_slab_object mm/kasan/common.c:253 [inline]
 __kasan_slab_free+0x5c/0x80 mm/kasan/common.c:285
 kasan_slab_free include/linux/kasan.h:235 [inline]
 slab_free_hook mm/slub.c:2667 [inline]
 slab_free mm/slub.c:6079 [inline]
 kfree+0x1c1/0x610 mm/slub.c:6392
 ieee80211_inform_bss+0xc75/0x1160 net/mac80211/scan.c:164
 rdev_inform_bss net/wireless/rdev-ops.h:418 [inline]
 cfg80211_inform_single_bss_data+0xcf9/0x1ab0 net/wireless/scan.c:2373
 cfg80211_inform_bss_data+0x23f/0x3c20 net/wireless/scan.c:3228
 cfg80211_inform_bss_frame_data+0x3c7/0x710 net/wireless/scan.c:3319
 ieee80211_bss_info_update+0x794/0xa40 net/mac80211/scan.c:230
 ieee80211_rx_bss_info net/mac80211/ibss.c:1094 [inline]
 ieee80211_rx_mgmt_probe_beacon net/mac80211/ibss.c:1575 [inline]
 ieee80211_ibss_rx_queued_mgmt+0x1901/0x2c80 net/mac80211/ibss.c:1602
 ieee80211_iface_process_skb net/mac80211/iface.c:1740 [inline]
 ieee80211_iface_work+0x85e/0x12a0 net/mac80211/iface.c:1794
 cfg80211_wiphy_work+0x2ab/0x450 net/wireless/core.c:440
 process_one_work+0x949/0x15a0 kernel/workqueue.c:3279
 process_scheduled_works kernel/workqueue.c:3362 [inline]
 worker_thread+0xb46/0x1140 kernel/workqueue.c:3443
 kthread+0x388/0x470 kernel/kthread.c:467
 ret_from_fork+0x51b/0xa40 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
task:syz-executor    state:R  running task     stack:20520 pid:6389  tgid:6389  ppid:6380   task_flags:0x400140 flags:0x00080001
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5295 [inline]
 __schedule+0x1539/0x5080 kernel/sched/core.c:6907
 preempt_schedule_irq+0x4d/0xa0 kernel/sched/core.c:7234
 irqentry_exit+0x599/0x620 kernel/entry/common.c:239
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:save_netdev_trace_buffer+0x201/0x610 net/core/dev.c:13454
Code: 4e f8 48 89 d8 48 c1 e8 03 42 80 3c 30 00 4c 8b 64 24 38 74 08 48 89 df e8 7c 3d b8 f8 48 8b 1b 4c 39 e3 74 28 e8 bf db 4e f8 <e9> 65 ff ff ff 44 89 e1 80 e1 07 80 c1 03 38 c1 0f 8c 6c ff ff ff
RSP: 0018:ffffc900023de640 EFLAGS: 00000293
RAX: ffffffff89760e21 RBX: ffffffff9ad62d20 RCX: ffff888031171e40
RDX: 0000000000000000 RSI: 0000000000000010 RDI: 000000000000000d
RBP: ffffc900023de7f8 R08: ffffc900023de5d0 R09: 0000000000000013
R10: ffffc900023de558 R11: ffffffff81b02c90 R12: ffff88805a6e0318
R13: 0000000000000080 R14: dffffc0000000000 R15: 0000000000000010
 __dev_hold include/linux/netdevice.h:4403 [inline]
 netdev_hold include/linux/netdevice.h:4446 [inline]
 dev_hold include/linux/netdevice.h:4469 [inline]
 dev_get_by_index+0x1b3/0x2f0 net/core/dev.c:995
 fib_create_info+0x2296/0x31f0 net/ipv4/fib_semantics.c:1493
 fib_table_insert+0xc8/0x1b50 net/ipv4/fib_trie.c:1212
 fib_magic+0x434/0x510 net/ipv4/fib_frontend.c:1134
 fib_add_ifaddr+0x144/0x5f0 net/ipv4/fib_frontend.c:1156
 fib_netdev_event+0x382/0x490 net/ipv4/fib_frontend.c:1516
 notifier_call_chain+0x19d/0x3a0 kernel/notifier.c:85
 call_netdevice_notifiers_extack net/core/dev.c:2281 [inline]
 call_netdevice_notifiers net/core/dev.c:2295 [inline]
 __dev_notify_flags+0x1a9/0x310 net/core/dev.c:9788
 netif_change_flags+0xe8/0x1a0 net/core/dev.c:9817
 do_setlink+0xf82/0x4590 net/core/rtnetlink.c:3158
 rtnl_changelink net/core/rtnetlink.c:3776 [inline]
 __rtnl_newlink net/core/rtnetlink.c:3935 [inline]
 rtnl_newlink+0x15a9/0x1be0 net/core/rtnetlink.c:4072
 rtnetlink_rcv_msg+0x7d5/0xbe0 net/core/rtnetlink.c:6958
 netlink_rcv_skb+0x232/0x4b0 net/netlink/af_netlink.c:2550
 netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline]
 netlink_unicast+0x80f/0x9b0 net/netlink/af_netlink.c:1344
 netlink_sendmsg+0x813/0xb40 net/netlink/af_netlink.c:1894
 sock_sendmsg_nosec+0x18f/0x1d0 net/socket.c:737
 __sock_sendmsg net/socket.c:752 [inline]
 __sys_sendto+0x3ff/0x590 net/socket.c:2221
 __do_sys_sendto net/socket.c:2228 [inline]
 __se_sys_sendto net/socket.c:2224 [inline]
 __x64_sys_sendto+0xde/0x100 net/socket.c:2224
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xe2/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f0dd095ae0e
RSP: 002b:00007fff88f09198 EFLAGS: 00000246 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 000055556f24e500 RCX: 00007f0dd095ae0e
RDX: 000000000000002c RSI: 00007f0dd1734670 RDI: 0000000000000003
RBP: 0000000000000001 R08: 00007fff88f09214 R09: 000000000000000c
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000003
R13: 0000000000000000 R14: 00007f0dd1734670 R15: 0000000000000000
 </TASK>
rcu: rcu_preempt kthread starved for 406 jiffies! g19261 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=0
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:28088 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00080000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5295 [inline]
 __schedule+0x1539/0x5080 kernel/sched/core.c:6907
 __schedule_loop kernel/sched/core.c:6989 [inline]
 schedule+0x164/0x360 kernel/sched/core.c:7004
 schedule_timeout+0x158/0x2c0 kernel/time/sleep_timeout.c:99
 rcu_gp_fqs_loop+0x312/0x11d0 kernel/rcu/tree.c:2095
 rcu_gp_kthread+0x9e/0x2b0 kernel/rcu/tree.c:2297
 kthread+0x388/0x470 kernel/kthread.c:467
 ret_from_fork+0x51b/0xa40 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:
CPU: 0 UID: 0 PID: 10 Comm: kworker/0:1 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/24/2026
Workqueue: events_power_efficient gc_worker
RIP: 0010:pv_native_safe_halt+0xf/0x20 arch/x86/kernel/paravirt.c:63
Code: e1 77 02 e9 83 e6 02 00 cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 66 90 0f 00 2d c3 1f 27 00 fb f4 <c3> cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc 90 90 90 90 90
RSP: 0018:ffffc900000070e8 EFLAGS: 00000246
RAX: ffffffff8175647a RBX: 0000000000000003 RCX: ffff88801dafbc80
RDX: 0000000000000100 RSI: ffffffff8dee82eb RDI: ffffffff8c277000
RBP: 0000000000000003 R08: ffffffff9010f6b7 R09: 1ffffffff2021ed6
R10: dffffc0000000000 R11: fffffbfff2021ed7 R12: 0000000000000200
R13: 0000000000000000 R14: ffff888073858150 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff888125296000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000562ea5c9f950 CR3: 0000000078a38000 CR4: 00000000003526f0
Call Trace:
 <IRQ>
 arch_safe_halt arch/x86/include/asm/paravirt.h:73 [inline]
 kvm_wait+0x10f/0x150 arch/x86/kernel/kvm.c:1101
 pv_wait arch/x86/include/asm/paravirt-spinlock.h:83 [inline]
 pv_wait_head_or_lock kernel/locking/qspinlock_paravirt.h:466 [inline]
 __pv_queued_spin_lock_slowpath+0x74c/0xbc0 kernel/locking/qspinlock.c:325
 pv_queued_spin_lock_slowpath arch/x86/include/asm/paravirt-spinlock.h:35 [inline]
 queued_spin_lock_slowpath arch/x86/include/asm/paravirt-spinlock.h:66 [inline]
 queued_spin_lock include/asm-generic/qspinlock.h:114 [inline]
 do_raw_spin_lock+0x26c/0x2f0 kernel/locking/spinlock_debug.c:116
 spin_lock_bh include/linux/spinlock.h:347 [inline]
 cfg80211_inform_single_bss_data+0xbab/0x1ab0 net/wireless/scan.c:2368
 cfg80211_inform_bss_data+0x23f/0x3c20 net/wireless/scan.c:3228
 cfg80211_inform_bss_frame_data+0x3c7/0x710 net/wireless/scan.c:3319
 ieee80211_bss_info_update+0x794/0xa40 net/mac80211/scan.c:230
 ieee80211_scan_rx+0x552/0xa40 net/mac80211/scan.c:364
 __ieee80211_rx_handle_packet net/mac80211/rx.c:5297 [inline]
 ieee80211_rx_list+0x2508/0x3050 net/mac80211/rx.c:5554
 ieee80211_rx_napi+0x1b1/0x3e0 net/mac80211/rx.c:5577
 ieee80211_rx include/net/mac80211.h:5218 [inline]
 ieee80211_handle_queued_frames+0xe8/0x1e0 net/mac80211/main.c:452
 tasklet_action_common+0x2da/0x4b0 kernel/softirq.c:929
 handle_softirqs+0x22a/0x7c0 kernel/softirq.c:626
 __do_softirq kernel/softirq.c:660 [inline]
 invoke_softirq kernel/softirq.c:496 [inline]
 __irq_exit_rcu+0x5f/0x150 kernel/softirq.c:727
 irq_exit_rcu+0x9/0x30 kernel/softirq.c:743
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1056 [inline]
 sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1056
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:gc_worker+0xb71/0x1290 net/netfilter/nf_conntrack_core.c:1621
Code: e8 54 15 e0 f7 e8 7f b6 e9 f7 48 c7 c7 00 9f e2 8c be 52 06 00 00 31 d2 e8 8c e0 d3 f7 2e 2e 2e 31 c0 48 8b 84 24 88 00 00 00 <42> 80 3c 20 00 74 0c 48 c7 c7 80 12 41 8e e8 fc 1e 6d f8 44 8b 7c
RSP: 0018:ffffc900000f79e0 EFLAGS: 00000246
RAX: 1ffffffff1c82250 RBX: ffff888148c00000 RCX: 0000000000000046
RDX: 0000000000000000 RSI: ffffffff8e158d9b RDI: ffffffff8c277000
RBP: ffffc900000f7b30 R08: ffffffff9010f6b7 R09: 1ffffffff2021ed6
R10: dffffc0000000000 R11: fffffbfff2021ed7 R12: dffffc0000000000
R13: 1ffff11003b5f820 R14: 0000000000000001 R15: 0000000000009743
 process_one_work+0x949/0x15a0 kernel/workqueue.c:3279
 process_scheduled_works kernel/workqueue.c:3362 [inline]
 worker_thread+0xb46/0x1140 kernel/workqueue.c:3443
 kthread+0x388/0x470 kernel/kthread.c:467
 ret_from_fork+0x51b/0xa40 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
sched: DL replenish lagged too much