rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: 0-....: (1 GPs behind) idle=e45/1/0x4000000000000002 softirq=68013/68014 fqs=5243 (detected by 1, t=10502 jiffies, g=90225, q=1298) Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 23764 Comm: syz.0.5111 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026 RIP: 0010:perf_prepare_sample+0xc9f/0x1cd0 kernel/events/core.c:7717 Code: 8b 7c 24 10 4c 8b 74 24 20 4c 89 f6 48 81 e6 00 00 04 00 31 ff e8 41 36 e1 ff 4c 89 f0 48 25 00 00 04 00 75 0a e8 51 32 e1 ff ef 00 00 00 4c 89 f8 49 81 c7 90 00 00 00 48 8d 98 98 00 00 00 RSP: 0018:ffffc90000007460 EFLAGS: 00000046 RAX: ffffffff8198023f RBX: ffffc90000007600 RCX: ffff88807ac70000 RDX: 0000000000000100 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffc90000007550 R08: ffffc900000075d7 R09: ffffc900000075a0 R10: dffffc0000000000 R11: fffff52000000ebb R12: dffffc0000000000 R13: ffffc90000007606 R14: 0000000000000000 R15: ffffc900000077c0 FS: 00007f34290946c0(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fa575b7d6b8 CR3: 00000000583b7000 CR4: 00000000003506f0 DR0: 0000200000000300 DR1: 0000200000000300 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff3 DR7: 0000000000000600 Call Trace: __perf_event_output kernel/events/core.c:7802 [inline] perf_event_output_forward+0x185/0x2e0 kernel/events/core.c:7822 __perf_event_overflow+0x364/0x530 kernel/events/core.c:9515 perf_swevent_overflow kernel/events/core.c:9591 [inline] perf_swevent_event+0x4ad/0x530 kernel/events/core.c:9629 perf_tp_event+0x383/0xbf0 kernel/events/core.c:10047 perf_trace_run_bpf_submit+0xf3/0x1c0 kernel/events/core.c:10021 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+0x73/0xd0 kernel/rcu/tree_plugin.h:422 Code: 84 c0 75 5f 41 83 3e 00 75 20 43 0f b6 04 3c 84 c0 75 3a 8b 03 3d 00 00 00 40 73 0a 5b 41 5c 41 5d 41 5e 41 5f c3 0f 0b eb f2 58 00 00 00 eb d9 89 d9 80 e1 07 80 c1 03 38 c1 7c ac 49 89 fe RSP: 0018:ffffc90000007be8 EFLAGS: 00000206 RAX: 0000000000000000 RBX: ffff88807ac7043c RCX: ffff88807ac70000 RDX: 0000000000000100 RSI: ffffffff8a79fe20 RDI: ffff88807ac70000 RBP: 0000000000000002 R08: ffffffff8d89f06f R09: 1ffffffff1b13e0d R10: dffffc0000000000 R11: fffffbfff1b13e0e R12: 1ffff1100f58e087 R13: 0000000000019000 R14: ffff88807ac70440 R15: dffffc0000000000 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+0x4f2/0xb70 kernel/time/hrtimer.c:1749 hrtimer_run_softirq+0x176/0x240 kernel/time/hrtimer.c:1766 handle_softirqs+0x339/0x830 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:__phys_addr+0x0/0x170 arch/x86/mm/physaddr.c:16 Code: 48 89 df e8 a2 25 00 00 4c 89 ff 31 f6 e8 e8 c0 7e 00 b8 01 00 00 00 48 83 c4 08 5b 41 5c 41 5d 41 5e 41 5f 5d c3 00 00 cc cc <41> 57 41 56 53 48 89 fb e8 e3 28 43 00 48 bf ff ff ff 7f ff ff ff RSP: 0018:ffffc9000339f2a0 EFLAGS: 00000286 RAX: ffffea000111ca00 RBX: ffff88804472a000 RCX: ffffea0000000000 RDX: 0000000000000001 RSI: ffffc9000339f308 RDI: ffff88804472a000 RBP: 0000000000000000 R08: ffff888075100640 R09: 00000000800c0003 R10: dffffc0000000000 R11: ffffed1017207662 R12: ffffc9000339f308 R13: 0000000000000001 R14: ffffffff81be6267 R15: ffff888016c42140 virt_to_head_page include/linux/mm.h:911 [inline] memcg_slab_free_hook+0x89/0x1f0 mm/slab.h:348 do_slab_free mm/slub.c:3437 [inline] ___cache_free+0x63/0x120 mm/slub.c:3511 qlist_free_all+0x35/0x90 mm/kasan/quarantine.c:176 kasan_quarantine_reduce+0x150/0x160 mm/kasan/quarantine.c:283 ____kasan_kmalloc mm/kasan/common.c:479 [inline] __kasan_kmalloc+0x2f/0xf0 mm/kasan/common.c:522 kmalloc_node include/linux/slab.h:630 [inline] kvmalloc_node+0x84/0x130 mm/util.c:619 kvmalloc include/linux/mm.h:816 [inline] kvmalloc_array include/linux/mm.h:834 [inline] kvcalloc include/linux/mm.h:839 [inline] bpf_check+0xbad/0xf270 kernel/bpf/verifier.c:14108 bpf_prog_load+0xfec/0x1510 kernel/bpf/syscall.c:2354 __sys_bpf+0x532/0x6f0 kernel/bpf/syscall.c:4657 __do_sys_bpf kernel/bpf/syscall.c:4761 [inline] __se_sys_bpf kernel/bpf/syscall.c:4759 [inline] __x64_sys_bpf+0x78/0x90 kernel/bpf/syscall.c:4759 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: 0033:0x7f342ae3add9 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:00007f3429094028 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 00007f342b0b3fa0 RCX: 00007f342ae3add9 RDX: 0000000000000094 RSI: 0000200000000c00 RDI: 0000000000000005 RBP: 00007f342aed0d69 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f342b0b4038 R14: 00007f342b0b3fa0 R15: 00007ffc54ba3298