rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: 0-....: (181 ticks this GP) idle=221/1/0x4000000000000002 softirq=149288/149288 fqs=2145 (detected by 1, t=10503 jiffies, g=207825, q=1472) Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 20750 Comm: syz.0.13060 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026 RIP: 0010:rcu_lockdep_current_cpu_online+0x30/0x130 kernel/rcu/tree.c:1171 Code: 53 65 8b 0d 3a 8e 9d 7e b0 01 f7 c1 00 00 f0 00 0f 85 e2 00 00 00 83 3d e5 0f 25 0c 00 0f 84 d5 00 00 00 65 ff 05 18 8e 9d 7e fb 07 58 08 89 c3 83 f8 08 0f 83 cd 00 00 00 49 bf 00 00 00 00 RSP: 0018:ffffc90000007200 EFLAGS: 00000006 RAX: 0000000000021201 RBX: 0000000000000000 RCX: 0000000000000102 RDX: 0000000000000100 RSI: ffffffff8a79fe20 RDI: ffffffff8a79fde0 RBP: 0000000000000001 R08: ffffc900000073d7 R09: ffffc900000073a0 R10: dffffc0000000000 R11: fffff52000000e7b R12: dffffc0000000000 R13: ffffc90000007406 R14: ffffffff8c125da0 R15: dffffc0000000000 FS: 00007efc8d84d6c0(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000020000000cf3d CR3: 000000009ef58000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000200000000300 DR6: 00000000ffff0ff1 DR7: 0000000000000600 Call Trace: rcu_read_lock_held_common kernel/rcu/update.c:112 [inline] rcu_read_lock_held+0x1a/0x40 kernel/rcu/update.c:309 perf_get_guest_cbs include/linux/perf_event.h:1274 [inline] perf_misc_flags+0x56/0x1b0 arch/x86/events/core.c:2961 perf_prepare_sample+0x132/0x1cd0 kernel/events/core.c:7622 __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_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 32 e1 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:ffffc900000079e0 EFLAGS: 00000206 RAX: e3fd91ce6836ce00 RBX: 1ffff92000000f40 RCX: e3fd91ce6836ce00 RDX: dffffc0000000000 RSI: ffffffff8a2b2800 RDI: ffffffff8a79fe40 RBP: ffffc90000007ac0 R08: ffffffff901d51bf R09: 1ffffffff203aa37 R10: dffffc0000000000 R11: fffffbfff203aa38 R12: ffffffff8c323000 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] hsr_announce+0x29a/0x310 net/hsr/hsr_device.c:410 call_timer_fn+0x17b/0x540 kernel/time/timer.c:1648 expire_timers kernel/time/timer.c:1699 [inline] __run_timers+0x53e/0x800 kernel/time/timer.c:1970 run_timer_softirq+0x63/0xf0 kernel/time/timer.c:1983 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:finish_lock_switch+0x134/0x280 kernel/sched/core.c:4804 Code: be ff ff ff ff e8 3c 62 68 08 85 c0 74 4a 4d 85 ff 75 66 0f 1f 44 00 00 48 89 df e8 e6 cd 71 08 e8 61 e6 2a 00 fb 48 83 c4 08 <5b> 41 5c 41 5d 41 5e 41 5f 5d c3 48 89 df e8 c9 09 fe ff 43 80 3c RSP: 0018:ffffc9000308e648 EFLAGS: 00000286 RAX: e3fd91ce6836ce00 RBX: ffff8880b903a340 RCX: e3fd91ce6836ce00 RDX: dffffc0000000000 RSI: ffffffff8a2b2800 RDI: ffffffff8a79fe40 RBP: 1ffff11017207613 R08: ffffffff901d50f7 R09: 1ffffffff203aa1e R10: dffffc0000000000 R11: fffffbfff203aa1f R12: 1ffff110172075c1 R13: dffffc0000000000 R14: ffff8880b903ae08 R15: 0000000000000000 finish_task_switch+0x12f/0x640 kernel/sched/core.c:4921 context_switch kernel/sched/core.c:5052 [inline] __schedule+0x11f7/0x43c0 kernel/sched/core.c:6395 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_irqrestore include/linux/spinlock_api_smp.h:161 [inline] _raw_spin_unlock_irqrestore+0x10d/0x120 kernel/locking/spinlock.c:194 rcu_report_unblock_qs_rnp kernel/rcu/tree.c:2275 [inline] rcu_preempt_deferred_qs_irqrestore+0x9dd/0xc30 kernel/rcu/tree_plugin.h:552 rcu_read_unlock_special+0x3dd/0x4a0 kernel/rcu/tree_plugin.h:673 __rcu_read_unlock+0x78/0xd0 kernel/rcu/tree_plugin.h:422 rcu_read_unlock include/linux/rcupdate.h:772 [inline] count_memcg_event_mm+0x31f/0x370 include/linux/memcontrol.h:1082 handle_mm_fault+0x134/0x4410 mm/memory.c:4863 do_user_addr_fault+0x489/0xc80 arch/x86/mm/fault.c:1355 handle_page_fault arch/x86/mm/fault.c:1443 [inline] exc_page_fault+0x60/0x100 arch/x86/mm/fault.c:1496 asm_exc_page_fault+0x22/0x30 arch/x86/include/asm/idtentry.h:606 RIP: 0010:copy_user_generic_unrolled+0xa0/0xc0 arch/x86/lib/copy_user_64.S:101 Code: 7f 40 ff c9 75 b6 89 d1 83 e2 07 c1 e9 03 74 12 4c 8b 06 4c 89 07 48 8d 76 08 48 8d 7f 08 ff c9 75 ee 21 d2 74 10 89 d1 8a 06 <88> 07 48 ff c6 48 ff c7 ff c9 75 f2 31 c0 0f 01 ca c3 90 90 90 90 RSP: 0018:ffffc9000308f0f8 EFLAGS: 00050202 RAX: ffffffff83e41230 RBX: 0000000000000004 RCX: 0000000000000004 RDX: 0000000000000004 RSI: ffff88807a59066c RDI: 000020000000cf3d RBP: 0000000000000000 R08: ffff88807a59066f R09: 1ffff1100f4b20cd R10: dffffc0000000000 R11: ffffed100f4b20ce R12: 00007ffffffff000 R13: 000020000000cf41 R14: ffff88807a59066c R15: 000020000000cf3d copy_user_generic arch/x86/include/asm/uaccess_64.h:37 [inline] raw_copy_to_user arch/x86/include/asm/uaccess_64.h:58 [inline] _copy_to_user+0xf0/0x130 lib/usercopy.c:40 copy_to_user include/linux/uaccess.h:200 [inline] bpf_verifier_vlog+0x1b5/0x350 kernel/bpf/verifier.c:303 verbose+0x1f2/0x2b0 kernel/bpf/verifier.c:348 do_check+0x4836/0xeb00 kernel/bpf/verifier.c:11272 do_check_common+0xe82/0x16e0 kernel/bpf/verifier.c:13512 do_check_main kernel/bpf/verifier.c:13575 [inline] bpf_check+0x9c84/0xf270 kernel/bpf/verifier.c:14146 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: 0033:0x7efc8f5f3dd9 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:00007efc8d84d028 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 00007efc8f86cfa0 RCX: 00007efc8f5f3dd9 RDX: 0000000000000048 RSI: 0000200000000080 RDI: 0000000000000005 RBP: 00007efc8f689d69 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007efc8f86d038 R14: 00007efc8f86cfa0 R15: 00007ffc3654eba8