wlan1: beacon TX faster than countdown (channel/color switch) completion rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: 0-...!: (1 GPs behind) idle=da04/1/0x4000000000000000 softirq=29429/29430 fqs=1 rcu: (detected by 1, t=10506 jiffies, g=22625, q=258 ncpus=2) Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 8440 Comm: syz.0.612 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 RIP: 0010:__sanitizer_cov_trace_pc+0x0/0x70 kernel/kcov.c:210 Code: e6 63 58 00 48 89 df 5b e9 cd 16 5e 00 be 03 00 00 00 5b e9 e2 d9 ed 02 66 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 0f 1e fa 48 8b 34 24 65 48 8b 15 08 bc f3 11 65 8b 05 19 bc f3 RSP: 0018:ffffc90000007e38 EFLAGS: 00000046 RAX: 0000000000010002 RBX: ffff8880b8428540 RCX: ffffffff81aac301 RDX: ffff8880351bc980 RSI: 0000000000000000 RDI: 0000000000000005 RBP: 0000000000000001 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000000000000 R11: ffff8880351bd4b0 R12: ffff8880b8428440 R13: 18884ed2a3c9d405 R14: ffff888029b97300 R15: 0000000000000001 FS: 00007f27a84156c0(0000) GS:ffff8881248f6000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000200000001480 CR3: 0000000079104000 CR4: 00000000003526f0 DR0: 0000000000800003 DR1: 00000000000001f5 DR2: 0000000000000483 DR3: 0000000000000007 DR6: 00000000ffff0ff0 DR7: 0000000000000400 Call Trace: __run_hrtimer kernel/time/hrtimer.c:1757 [inline] __hrtimer_run_queues+0x55f/0xc40 kernel/time/hrtimer.c:1841 hrtimer_interrupt+0x397/0x8e0 kernel/time/hrtimer.c:1903 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1045 [inline] __sysvec_apic_timer_interrupt+0x10b/0x3c0 arch/x86/kernel/apic/apic.c:1062 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1056 [inline] sysvec_apic_timer_interrupt+0x9f/0xc0 arch/x86/kernel/apic/apic.c:1056 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697 RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline] RIP: 0010:_raw_spin_unlock_irqrestore+0x31/0x80 kernel/locking/spinlock.c:194 Code: f5 53 48 8b 74 24 10 48 89 fb 48 83 c7 18 e8 b6 1b 1f f6 48 89 df e8 6e 6e 1f f6 f7 c5 00 02 00 00 75 23 9c 58 f6 c4 02 75 37 01 00 00 00 e8 75 71 0f f6 65 8b 05 2e c9 37 08 85 c0 74 16 5b RSP: 0018:ffffc9000479fc98 EFLAGS: 00000246 RAX: 0000000000000006 RBX: ffff8880b8428440 RCX: 0000000000000007 RDX: 0000000000000000 RSI: ffffffff8dacdb2d RDI: ffffffff8bf2b300 RBP: 0000000000000283 R08: 0000000000000001 R09: 0000000000000001 R10: ffffffff9088aed7 R11: ffff8880351bd4b0 R12: 0000000000000000 R13: 000000381382d050 R14: dffffc0000000000 R15: ffff8880b8428440 clock_was_set+0x599/0x870 kernel/time/hrtimer.c:965 do_settimeofday64+0x364/0x550 kernel/time/timekeeping.c:1460 do_sys_settimeofday64+0x1dc/0x260 kernel/time/time.c:195 __do_sys_clock_settime kernel/time/posix-timers.c:1131 [inline] __se_sys_clock_settime kernel/time/posix-timers.c:1115 [inline] __x64_sys_clock_settime+0x1c1/0x2a0 kernel/time/posix-timers.c:1115 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f27a758f749 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f27a8415038 EFLAGS: 00000246 ORIG_RAX: 00000000000000e3 RAX: ffffffffffffffda RBX: 00007f27a77e5fa0 RCX: 00007f27a758f749 RDX: 0000000000000000 RSI: 0000200000000240 RDI: 0000000000000000 RBP: 00007f27a7613f91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f27a77e6038 R14: 00007f27a77e5fa0 R15: 00007ffdf755a778 rcu: rcu_preempt kthread starved for 10500 jiffies! g22625 f0x0 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:28632 pid:16 tgid:16 ppid:2 task_flags:0x208040 flags:0x00080000 Call Trace: context_switch kernel/sched/core.c:5256 [inline] __schedule+0x1139/0x6150 kernel/sched/core.c:6863 __schedule_loop kernel/sched/core.c:6945 [inline] schedule+0xe7/0x3a0 kernel/sched/core.c:6960 schedule_timeout+0x123/0x290 kernel/time/sleep_timeout.c:99 rcu_gp_fqs_loop+0x1ea/0xaf0 kernel/rcu/tree.c:2083 rcu_gp_kthread+0x26d/0x380 kernel/rcu/tree.c:2285 kthread+0x3c5/0x780 kernel/kthread.c:463 ret_from_fork+0x983/0xb10 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246 rcu: Stack dump where RCU GP kthread last ran: CPU: 1 UID: 0 PID: 1127 Comm: kworker/u8:7 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 Workqueue: events_unbound toggle_allocation_gate RIP: 0010:write_comp_data+0x0/0x90 kernel/kcov.c:240 Code: 48 8b 05 5b c3 f3 11 48 8b 80 60 16 00 00 e9 d7 46 bc 09 0f 1f 80 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 <49> 89 d2 49 89 f8 49 89 f1 65 48 8b 15 27 c3 f3 11 65 8b 05 38 c3 RSP: 0018:ffffc9000420f800 EFLAGS: 00000202 RAX: 0000000000000001 RBX: ffff8880b84431e0 RCX: ffffffff81b28971 RDX: 0000000000000001 RSI: 0000000000000000 RDI: 0000000000000005 RBP: 0000000000000003 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000000000001 R11: ffff888028118b30 R12: dffffc0000000000 R13: ffffed101708863d R14: 0000000000000001 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff8881249f6000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000555570304808 CR3: 000000000e184000 CR4: 00000000003526f0 DR0: 0000000000800003 DR1: 00000000000001f5 DR2: 0000000000000483 DR3: 0000000000000007 DR6: 00000000ffff0ff0 DR7: 0000000000000400 Call Trace: csd_lock_wait kernel/smp.c:342 [inline] smp_call_function_many_cond+0xe21/0x15e0 kernel/smp.c:877 on_each_cpu_cond_mask+0x40/0x90 kernel/smp.c:1043 on_each_cpu include/linux/smp.h:71 [inline] smp_text_poke_sync_each_cpu arch/x86/kernel/alternative.c:2711 [inline] smp_text_poke_batch_finish+0x27b/0xdb0 arch/x86/kernel/alternative.c:2921 arch_jump_label_transform_apply+0x1c/0x30 arch/x86/kernel/jump_label.c:146 jump_label_update+0x376/0x550 kernel/jump_label.c:919 static_key_enable_cpuslocked+0x1b7/0x270 kernel/jump_label.c:210 static_key_enable+0x1a/0x20 kernel/jump_label.c:223 toggle_allocation_gate mm/kfence/core.c:874 [inline] toggle_allocation_gate+0xfa/0x280 mm/kfence/core.c:866 process_one_work+0x9ba/0x1b20 kernel/workqueue.c:3257 process_scheduled_works kernel/workqueue.c:3340 [inline] worker_thread+0x6c8/0xf10 kernel/workqueue.c:3421 kthread+0x3c5/0x780 kernel/kthread.c:463 ret_from_fork+0x983/0xb10 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246