rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: 0-....: (1 ticks this GP) idle=517c/1/0x4000000000000000 softirq=19531/19531 fqs=5249 rcu: hardirqs softirqs csw/system rcu: number: 13026941 0 0 rcu: cputime: 5509 47008 0 ==> 52500(ms) rcu: (detected by 1, t=10502 jiffies, g=24101, q=349 ncpus=2) Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 7425 Comm: syz.3.575 Not tainted 6.6.102-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025 RIP: 0010:asm_sysvec_irq_work+0x0/0x20 arch/x86/include/asm/idtentry.h:723 Code: 06 25 ed ff e9 a1 03 00 00 90 f3 0f 1e fa 0f 01 ca fc 6a ff e8 a1 02 00 00 48 89 c4 48 89 e7 e8 f6 06 ed ff e9 81 03 00 00 90 0f 1e fa 0f 01 ca fc 6a ff e8 81 02 00 00 48 89 c4 48 89 e7 e8 RSP: 0018:ffffc90000007ad8 EFLAGS: 00000006 RAX: 68e0e6fb6e703800 RBX: 1ffff92000000f68 RCX: 68e0e6fb6e703800 RDX: dffffc0000000000 RSI: ffffffff8aaab9c0 RDI: ffffffff8afc66c0 RBP: ffffc90000007bf0 R08: ffffffff90da3507 R09: 1ffffffff21b46a0 R10: dffffc0000000000 R11: fffffbfff21b46a1 R12: ffffffff8cd35400 R13: dffffc0000000000 R14: 0000000000000246 R15: 0000000000000001 FS: 00007f3756aa86c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f3756a87d58 CR3: 000000001bbfd000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000082 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: RIP: 0010:rcu_read_unlock_special+0x88/0x4c0 kernel/rcu/tree_plugin.h:682 Code: f1 f1 f1 00 f2 f2 f2 4a 89 04 2b 66 42 c7 44 2b 09 f3 f3 42 c6 44 2b 0b f3 65 44 8b 35 39 58 93 7e 41 f7 c6 00 00 f0 00 74 45 <48> c7 44 24 40 0e 36 e0 45 4a c7 04 2b 00 00 00 00 66 42 c7 44 2b RSP: 0018:ffffc90000007b00 EFLAGS: 00000206 __rcu_read_unlock+0x7c/0xd0 kernel/rcu/tree_plugin.h:426 rcu_read_unlock include/linux/rcupdate.h:818 [inline] ieee80211_iterate_active_interfaces_atomic+0x15a/0x180 net/mac80211/util.c:804 mac80211_hwsim_beacon+0xbb/0x1b0 drivers/net/wireless/virtual/mac80211_hwsim.c:2295 __run_hrtimer kernel/time/hrtimer.c:1755 [inline] __hrtimer_run_queues+0x51e/0xc40 kernel/time/hrtimer.c:1819 hrtimer_run_softirq+0x187/0x2b0 kernel/time/hrtimer.c:1836 handle_softirqs+0x280/0x820 kernel/softirq.c:578 __do_softirq kernel/softirq.c:612 [inline] invoke_softirq kernel/softirq.c:452 [inline] __irq_exit_rcu+0xc7/0x190 kernel/softirq.c:661 irq_exit_rcu+0x9/0x20 kernel/softirq.c:673 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1088 [inline] sysvec_apic_timer_interrupt+0xa4/0xc0 arch/x86/kernel/apic/apic.c:1088 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687 RIP: 0010:__list_add_valid_or_report+0x50/0xf0 lib/list_debug.c:29 Code: 89 ff 49 bd 00 00 00 00 00 fc ff df 4c 8d 63 08 4c 89 e0 48 c1 e8 03 42 80 3c 28 00 74 08 4c 89 e7 e8 74 86 b7 fd 49 8b 14 24 <4c> 39 f2 75 67 4c 89 f0 48 c1 e8 03 42 80 3c 28 00 74 08 4c 89 f7 RSP: 0018:ffffc900197cf918 EFLAGS: 00000246 RAX: 1ffffd4000165942 RBX: ffffea0000b2ca08 RCX: 0000000000000003 RDX: ffff8880b8e423e0 RSI: ffff8880b8e423e0 RDI: ffffea0000b41808 RBP: ffffea0000b2ca08 R08: 0000000000000003 R09: 1ffffffff21b46a0 R10: dffffc0000000000 R11: fffffbfff21b46a1 R12: ffffea0000b2ca10 R13: dffffc0000000000 R14: ffff8880b8e423e0 R15: ffffea0000b41808 __list_add_valid include/linux/list.h:88 [inline] __list_add include/linux/list.h:150 [inline] list_add include/linux/list.h:169 [inline] free_unref_page_commit+0xbf/0x570 mm/page_alloc.c:2401 free_unref_page+0x17e/0x2e0 mm/page_alloc.c:2452 discard_slab mm/slub.c:2122 [inline] __unfreeze_partials+0x1cf/0x210 mm/slub.c:2662 put_cpu_partial+0x17c/0x250 mm/slub.c:2738 __slab_free+0x31d/0x410 mm/slub.c:3686 qlink_free mm/kasan/quarantine.c:166 [inline] qlist_free_all+0x75/0xe0 mm/kasan/quarantine.c:185 kasan_quarantine_reduce+0x143/0x160 mm/kasan/quarantine.c:292 __kasan_slab_alloc+0x22/0x80 mm/kasan/common.c:305 kasan_slab_alloc include/linux/kasan.h:188 [inline] slab_post_alloc_hook+0x6e/0x4d0 mm/slab.h:767 slab_alloc_node mm/slub.c:3485 [inline] __kmem_cache_alloc_node+0x13e/0x260 mm/slub.c:3524 __do_kmalloc_node mm/slab_common.c:1006 [inline] __kmalloc_node+0xa4/0x230 mm/slab_common.c:1014 kmalloc_node include/linux/slab.h:620 [inline] __bpf_map_area_alloc kernel/bpf/syscall.c:301 [inline] bpf_map_area_alloc+0x5e/0x110 kernel/bpf/syscall.c:314 dev_map_init_map kernel/bpf/devmap.c:148 [inline] dev_map_alloc+0x1f6/0x4c0 kernel/bpf/devmap.c:167 map_create+0x877/0x1110 kernel/bpf/syscall.c:1245 __sys_bpf+0x5f0/0x800 kernel/bpf/syscall.c:5449 __do_sys_bpf kernel/bpf/syscall.c:5571 [inline] __se_sys_bpf kernel/bpf/syscall.c:5569 [inline] __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:5569 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7f3755b8ebe9 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:00007f3756aa8038 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 00007f3755db5fa0 RCX: 00007f3755b8ebe9 RDX: 0000000000000048 RSI: 00002000000009c0 RDI: 0000000000000000 RBP: 00007f3755c11e19 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f3755db6038 R14: 00007f3755db5fa0 R15: 00007fff87d4d4d8