rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: 0-....: (18 ticks this GP) idle=b01/1/0x4000000000000002 softirq=9030/9032 fqs=2101 (detected by 1, t=10506 jiffies, g=11181, q=1674) Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 5361 Comm: syz.2.231 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026 RIP: 0010:__perf_event_account_interrupt+0x47/0x280 kernel/events/core.c:9433 Code: e0 ff 48 c7 c7 c0 bb 32 8a e8 75 9b 29 08 65 4c 8b 3d 65 c3 6a 7e 4c 8d a3 00 02 00 00 4c 89 e5 48 c1 ed 03 42 80 7c 2d 00 00 <74> 08 4c 89 e7 e8 4f db 25 00 4d 8b 2c 24 4c 89 ff 4c 89 ee e8 20 RSP: 0018:ffffc90000007558 EFLAGS: 00000046 RAX: 0000000000000000 RBX: ffff88807a7d0bf0 RCX: 96b4aba1daa5ac00 RDX: 0000000000000100 RSI: ffffffff8a32bbc0 RDI: ffffffff8a7a4b40 RBP: 1ffff1100f4fa1be R08: ffff88807a7d1063 R09: 1ffff1100f4fa20c R10: dffffc0000000000 R11: ffffed100f4fa20d R12: ffff88807a7d0df0 R13: dffffc0000000000 R14: 0000000000000000 R15: 00000000000027ff FS: 00007f94551c76c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000200000306000 CR3: 000000001c3cd000 CR4: 00000000003506f0 DR0: 0000200000000d40 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: __perf_event_overflow+0x9a/0x550 kernel/events/core.c:9484 perf_swevent_overflow kernel/events/core.c:9601 [inline] perf_swevent_event+0x4b8/0x540 kernel/events/core.c:9639 perf_tp_event+0x324/0xbe0 kernel/events/core.c:10057 perf_trace_run_bpf_submit+0xf3/0x1c0 kernel/events/core.c:10031 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 82 fc 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: 96b4aba1daa5ac00 RBX: 1ffff92000000f64 RCX: 96b4aba1daa5ac00 RDX: dffffc0000000000 RSI: ffffffff8a2b2b60 RDI: ffffffff8a7a4b40 RBP: ffffc90000007bd8 R08: ffffffff9101515f R09: 1ffffffff2202a2b R10: dffffc0000000000 R11: fffffbfff2202a2c 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+0x121a/0x4350 kernel/sched/core.c:6403 Code: c7 44 20 08 00 00 00 00 65 48 8b 04 25 28 00 00 00 48 3b 84 24 80 01 00 00 0f 85 24 03 00 00 48 8d 65 d8 5b 41 5c 41 5d 41 5e <41> 5f 5d c3 49 8d bf c8 05 00 00 48 89 f8 48 c1 e8 03 48 ba 00 00 RSP: 0018:ffffc9000335f048 EFLAGS: 00000246 RAX: 96b4aba1daa5ac00 RBX: 0000000000000000 RCX: ffffffff81530e24 RDX: 0000000000000001 RSI: 0000000000000004 RDI: ffff88801f6a8760 RBP: ffffc9000335f050 R08: ffff88801f6a8763 R09: 1ffff11003ed50ec R10: dffffc0000000000 R11: ffffed1003ed50ed R12: 0000000000000000 R13: 0000000000000000 R14: dffffc0000000000 R15: ffff8880629022d0 preempt_schedule_irq+0xbb/0x160 kernel/sched/core.c:6799 irqentry_exit+0x63/0x70 kernel/entry/common.c:435 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:676 RIP: 0010:__set_page_owner_handle mm/page_owner.c:159 [inline] RIP: 0010:__set_page_owner+0xc1/0x2d0 mm/page_owner.c:182 Code: 95 63 b4 ff 41 83 ef 01 0f 82 03 02 00 00 e8 86 63 b4 ff 4c 8b 2d df ab 5b 0b 4b 8d 7c 2e 08 48 89 f8 48 c1 e8 03 0f b6 04 18 <84> c0 0f 85 39 01 00 00 4d 01 f5 8b 04 24 41 89 45 08 4c 89 e8 48 RSP: 0018:ffffc9000335f1d0 EFLAGS: 00000a06 RAX: 0000000000000000 RBX: dffffc0000000000 RCX: ffff888062901dc0 RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff888019895e30 RBP: 0000000000000000 R08: 000000000000000d R09: ffffffff89e000ca R10: 0000000000000002 R11: 00000000a292a673 R12: 0000000001100cca R13: 0000000000000008 R14: ffff888019895e20 R15: 0000000000000000 prep_new_page mm/page_alloc.c:2426 [inline] get_page_from_freelist+0x24f6/0x2670 mm/page_alloc.c:4192 __alloc_pages+0x1ee/0x480 mm/page_alloc.c:5501 alloc_pages_vma+0x2bc/0x790 mm/mempolicy.c:2146 shmem_alloc_page mm/shmem.c:1586 [inline] shmem_alloc_and_acct_page+0x47f/0xbe0 mm/shmem.c:1611 shmem_getpage_gfp+0x14be/0x2c10 mm/shmem.c:1906 shmem_getpage mm/shmem.c:151 [inline] shmem_write_begin+0xcd/0x1a0 mm/shmem.c:2474 generic_perform_write+0x2b6/0x550 mm/filemap.c:3785 __generic_file_write_iter+0x261/0x4e0 mm/filemap.c:3912 generic_file_write_iter+0xa6/0x1b0 mm/filemap.c:3944 call_write_iter include/linux/fs.h:2179 [inline] new_sync_write fs/read_write.c:507 [inline] vfs_write+0x748/0xd70 fs/read_write.c:594 ksys_write+0x153/0x260 fs/read_write.c:647 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: 0033:0x7f9456f6f559 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:00007f94551c7028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007f94571f6fa0 RCX: 00007f9456f6f559 RDX: 0000000013bb711e RSI: 0000200000000a80 RDI: 0000000000000006 RBP: 00007f9457006ab8 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f94571f7038 R14: 00007f94571f6fa0 R15: 00007ffd789ea968