rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: 0-....: (1 GPs behind) idle=89d/1/0x4000000000000000 softirq=25049/25052 fqs=2108 (detected by 1, t=10505 jiffies, g=36685, q=3399) Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 11543 Comm: syz.1.1717 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/07/2026 RIP: 0010:asm_exc_page_fault+0x4/0x30 arch/x86/include/asm/idtentry.h:606 Code: 74 24 28 ff 74 24 28 ff 74 24 28 e8 a6 05 00 00 48 89 c4 48 89 e7 e8 1b 5a e9 ff e9 86 06 00 00 90 90 90 90 90 90 0f 01 ca fc 87 05 00 00 48 89 c4 48 89 e7 48 8b 74 24 78 48 c7 44 24 78 ff RSP: 0018:ffffc90000007210 EFLAGS: 00000046 RAX: 0000000100000000 RBX: dffffc0000000000 RCX: ffff888027b45940 RDX: 0000000000000100 RSI: 0000000100000000 RDI: 00007fffffffeff0 RBP: 0000000100000000 R08: ffffffff8e6d322f R09: 1ffffffff1cda645 R10: dffffc0000000000 R11: fffffbfff1cda646 R12: 00007fffffffeff0 R13: 00000000ffffffff R14: 0000000100000000 R15: 000000000000007f FS: 00007fe445d5a6c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000100000000 CR3: 0000000018984000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000200000000140 DR2: 0000200000000140 DR3: 0000200000000140 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: RIP: 0010:__get_user_nocheck_8+0x6/0x13 arch/x86/lib/getuser.S:155 Code: 01 ca c3 90 0f 01 cb 0f ae e8 0f b7 10 31 c0 0f 01 ca c3 90 0f 01 cb 0f ae e8 8b 10 31 c0 0f 01 ca c3 90 90 0f 01 cb 0f ae e8 <48> 8b 10 31 c0 0f 01 ca c3 90 0f 01 ca 31 d2 48 c7 c0 f2 ff ff ff RSP: 0018:ffffc90000007240 EFLAGS: 00050046 perf_callchain_user+0x423/0xf80 arch/x86/events/core.c:2900 get_perf_callchain+0x33d/0x460 kernel/events/callchain.c:221 perf_callchain kernel/events/core.c:7618 [inline] perf_prepare_sample+0x352/0x1cb0 kernel/events/core.c:7645 __perf_event_output kernel/events/core.c:7814 [inline] perf_event_output_forward+0x185/0x2e0 kernel/events/core.c:7834 __perf_event_overflow+0x35f/0x550 kernel/events/core.c:9527 perf_tp_event+0x324/0xbe0 kernel/events/core.c:10059 perf_trace_run_bpf_submit+0xf3/0x1c0 kernel/events/core.c:10033 perf_trace_preemptirq_template+0x2aa/0x360 include/trace/events/preemptirq.h:14 trace_irq_enable_rcuidle+0x108/0x180 include/trace/events/preemptirq.h:40 trace_hardirqs_on+0x57/0x80 kernel/trace/trace_preemptirq.c:44 asm_sysvec_irq_work+0x16/0x20 arch/x86/include/asm/idtentry.h:713 RIP: 0010:rcu_read_unlock_special+0x7f/0x4a0 kernel/rcu/tree_plugin.h:674 Code: eb 03 48 b8 f1 f1 f1 f1 f8 f2 f2 f2 4a 89 04 2b 42 c7 44 2b 08 f8 f3 f3 f3 65 44 8b 35 d2 f6 9c 7e 41 f7 c6 00 00 f0 00 74 40 <48> c7 44 24 20 0e 36 e0 45 4a c7 04 2b 00 00 00 00 42 c7 44 2b 08 RSP: 0018:ffffc90000007b00 EFLAGS: 00000206 RAX: 023339e96ec39d00 RBX: 1ffff92000000f64 RCX: 023339e96ec39d00 RDX: dffffc0000000000 RSI: ffffffff8a2b2b60 RDI: ffffffff8a7a5100 RBP: ffffc90000007bd8 R08: ffff8880b8e3b30b R09: 1ffff110171c7661 R10: dffffc0000000000 R11: ffffed10171c7662 R12: ffffffff8d123400 R13: dffffc0000000000 R14: 0000000000000246 R15: 0000000000000001 __rcu_read_unlock+0x78/0xd0 kernel/rcu/tree_plugin.h:422 rcu_read_unlock include/linux/rcupdate.h:772 [inline] ieee80211_iterate_active_interfaces_atomic+0x132/0x140 net/mac80211/util.c:831 mac80211_hwsim_beacon+0x9b/0x180 drivers/net/wireless/mac80211_hwsim.c:1865 __run_hrtimer kernel/time/hrtimer.c:1685 [inline] __hrtimer_run_queues+0x4ea/0xb60 kernel/time/hrtimer.c:1749 hrtimer_run_softirq+0x176/0x240 kernel/time/hrtimer.c:1766 handle_softirqs+0x336/0x830 kernel/softirq.c:576 __do_softirq kernel/softirq.c:610 [inline] invoke_softirq kernel/softirq.c:450 [inline] __irq_exit_rcu+0x13b/0x230 kernel/softirq.c:659 irq_exit_rcu+0x5/0x20 kernel/softirq.c:671 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1108 [inline] sysvec_apic_timer_interrupt+0xa0/0xc0 arch/x86/kernel/apic/apic.c:1108 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:676 RIP: 0010:schedule_debug kernel/sched/core.c:5601 [inline] RIP: 0010:__schedule+0x155/0x4350 kernel/sched/core.c:6286 Code: f7 48 8b 1b 48 89 d8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df 80 3c 08 00 74 08 48 89 df e8 82 e3 ec f7 48 81 3b 9d 6e ac 57 <0f> 85 38 13 00 00 83 7c 24 58 00 75 54 49 8d 5f 18 48 89 d8 48 c1 RSP: 0018:ffffc90003edf880 EFLAGS: 00000246 RAX: 1ffff920007db000 RBX: ffffc90003ed8000 RCX: dffffc0000000000 RDX: 0000000000000010 RSI: 0000000000000000 RDI: ffffc90003edf9f0 RBP: ffffc90003edfa50 R08: ffffc90003edf9ef R09: ffffc90003edf9e0 R10: dffffc0000000000 R11: fffff520007dbf3e R12: ffff8880b8e00000 R13: ffffc90003edf9e0 R14: ffff8880b8e3ad58 R15: ffff888027b45940 preempt_schedule_common+0x82/0xd0 kernel/sched/core.c:6571 preempt_schedule+0xbc/0xd0 kernel/sched/core.c:6596 preempt_schedule_thunk+0x16/0x18 arch/x86/entry/thunk_64.S:34 __raw_spin_unlock include/linux/spinlock_api_smp.h:152 [inline] _raw_spin_unlock+0x36/0x40 kernel/locking/spinlock.c:186 spin_unlock include/linux/spinlock.h:404 [inline] futex_wake+0x49c/0x540 kernel/futex/core.c:1704 do_futex+0xd83/0x12b0 kernel/futex/core.c:4026 __do_sys_futex kernel/futex/core.c:4098 [inline] __se_sys_futex+0x389/0x420 kernel/futex/core.c:4079 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 RIP: 0033:0x7fe447b03559 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fe445d5a0e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: ffffffffffffffda RBX: 00007fe447d89fa8 RCX: 00007fe447b03559 RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00007fe447d89fac RBP: 00007fe447d89fa0 R08: 00362315911815a0 R09: 0000000000000000 R10: 0000000000000004 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fe447d8a038 R14: 00007ffdc4d06260 R15: 00007ffdc4d06348