rcu: INFO: rcu_preempt self-detected stall on CPU rcu: 0-....: (10485 ticks this GP) idle=8e2c/1/0x4000000000000000 softirq=13611/13614 fqs=5249 rcu: hardirqs softirqs csw/system rcu: number: 1596294 0 0 rcu: cputime: 13751 38738 40 ==> 52500(ms) rcu: (t=10502 jiffies g=11501 q=1122 ncpus=2) CPU: 0 PID: 6127 Comm: syz.1.34 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026 RIP: 0010:__sanitizer_cov_trace_pc+0x5c/0x60 kernel/kcov.c:234 Code: f8 15 00 00 83 fa 02 75 21 48 8b 91 00 16 00 00 48 8b 32 48 8d 7e 01 8b 89 fc 15 00 00 48 39 cf 73 08 48 89 3a 48 89 44 f2 08 0f 1f 00 f3 0f 1e fa 48 8b 04 24 65 48 8b 15 40 8a 7c 7e 65 8b RSP: 0018:ffffc900000064d8 EFLAGS: 00000246 RAX: ffffffff8130e749 RBX: 00000000000109c0 RCX: ffff88801f295a00 RDX: 0000000000000100 RSI: 0000000000000000 RDI: ffffffff8cf689e0 RBP: 0000000000010c8c R08: ffffffff911cd537 R09: 1ffffffff2239aa6 R10: dffffc0000000000 R11: fffffbfff2239aa7 R12: ffffffffffffffff R13: 000001fb70a57817 R14: 000000d5f53fa74c R15: ffffffff8cf689e0 FS: 000055555e97e500(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000562965dd9660 CR3: 00000000761ee000 CR4: 00000000003506f0 Call Trace: read_tsc+0x9/0x20 arch/x86/kernel/tsc.c:1129 tk_clock_read kernel/time/timekeeping.c:195 [inline] timekeeping_get_delta kernel/time/timekeeping.c:255 [inline] timekeeping_get_ns kernel/time/timekeeping.c:388 [inline] ktime_get_with_offset+0x169/0x330 kernel/time/timekeeping.c:891 ktime_get_real include/linux/timekeeping.h:79 [inline] netif_rx_internal+0x344/0x4e0 net/core/dev.c:5153 __netif_rx+0x78/0xc0 net/core/dev.c:5196 veth_forward_skb drivers/net/veth.c:325 [inline] veth_xmit+0x550/0x9f0 drivers/net/veth.c:378 __netdev_start_xmit include/linux/netdevice.h:4943 [inline] netdev_start_xmit include/linux/netdevice.h:4957 [inline] xmit_one net/core/dev.c:3644 [inline] dev_hard_start_xmit+0x246/0x740 net/core/dev.c:3660 __dev_queue_xmit+0x19a3/0x3660 net/core/dev.c:4454 dev_queue_xmit include/linux/netdevice.h:3113 [inline] br_dev_queue_push_xmit+0x6b3/0x870 net/bridge/br_forward.c:53 NF_HOOK+0x66e/0x700 include/linux/netfilter.h:304 br_nf_post_routing+0xb41/0xfb0 net/bridge/br_netfilter_hooks.c:977 nf_hook_entry_hookfn include/linux/netfilter.h:144 [inline] nf_hook_slow+0xbd/0x200 net/netfilter/core.c:626 nf_hook include/linux/netfilter.h:259 [inline] NF_HOOK+0x23e/0x3e0 include/linux/netfilter.h:302 br_forward_finish+0xd3/0x130 net/bridge/br_forward.c:66 br_nf_hook_thresh net/bridge/br_netfilter_hooks.c:1184 [inline] br_nf_forward_finish+0xa51/0xe80 net/bridge/br_netfilter_hooks.c:684 NF_HOOK+0x66e/0x700 include/linux/netfilter.h:304 br_nf_forward_ip+0xcc1/0x1110 net/bridge/br_netfilter_hooks.c:754 nf_hook_entry_hookfn include/linux/netfilter.h:144 [inline] nf_hook_slow+0xbd/0x200 net/netfilter/core.c:626 nf_hook include/linux/netfilter.h:259 [inline] NF_HOOK+0x23e/0x3e0 include/linux/netfilter.h:302 __br_forward+0x433/0x610 net/bridge/br_forward.c:115 br_handle_frame_finish+0x13c5/0x18f0 net/bridge/br_input.c:215 br_nf_hook_thresh+0x3cd/0x4a0 net/bridge/br_netfilter_hooks.c:1184 br_nf_pre_routing_finish_ipv6+0x9dc/0xd00 net/bridge/br_netfilter_ipv6.c:-1 NF_HOOK include/linux/netfilter.h:304 [inline] br_nf_pre_routing_ipv6+0x349/0x6b0 net/bridge/br_netfilter_ipv6.c:184 nf_hook_entry_hookfn include/linux/netfilter.h:144 [inline] nf_hook_bridge_pre net/bridge/br_input.c:277 [inline] br_handle_frame+0x1245/0x14d0 net/bridge/br_input.c:424 __netif_receive_skb_core+0xfab/0x3af0 net/core/dev.c:5540 __netif_receive_skb_one_core net/core/dev.c:5644 [inline] __netif_receive_skb+0x74/0x290 net/core/dev.c:5760 process_backlog+0x391/0x6f0 net/core/dev.c:6088 __napi_poll+0xc0/0x460 net/core/dev.c:6650 napi_poll net/core/dev.c:6717 [inline] net_rx_action+0x616/0xc40 net/core/dev.c:6853 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+0xd3/0x190 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:finish_task_switch+0x26a/0x8f0 kernel/sched/core.c:5255 Code: 0f 84 33 01 00 00 48 85 db 0f 85 52 01 00 00 0f 1f 44 00 00 4c 8b 75 d0 4c 89 e7 e8 e0 94 34 09 e8 1b 2f 30 00 fb 4c 8b 65 c0 <49> 8d bc 24 f8 15 00 00 48 89 f8 48 c1 e8 03 42 0f b6 04 28 84 c0 RSP: 0018:ffffc900034b72b8 EFLAGS: 00000286 RAX: 6eaa1d53b1183d00 RBX: 0000000000000000 RCX: 6eaa1d53b1183d00 RDX: dffffc0000000000 RSI: ffffffff8acacbe0 RDI: ffffffff8b1c9c20 RBP: ffffc900034b7310 R08: ffffffff911cd537 R09: 1ffffffff2239aa6 R10: dffffc0000000000 R11: fffffbfff2239aa7 R12: ffff88801f295a00 R13: dffffc0000000000 R14: ffff88802996bc00 R15: ffff8880b8e3cb48 context_switch kernel/sched/core.c:5384 [inline] __schedule+0x155b/0x45a0 kernel/sched/core.c:6700 preempt_schedule_common+0x82/0xc0 kernel/sched/core.c:6867 preempt_schedule+0xc0/0xd0 kernel/sched/core.c:6891 preempt_schedule_thunk+0x1a/0x30 arch/x86/entry/thunk_64.S:45 __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline] _raw_spin_unlock_irqrestore+0x111/0x120 kernel/locking/spinlock.c:194 rcu_report_exp_rnp kernel/rcu/tree_exp.h:225 [inline] rcu_preempt_deferred_qs_irqrestore+0x8bb/0xce0 kernel/rcu/tree_plugin.h:570 rcu_read_unlock_special+0x3d4/0x4d0 kernel/rcu/tree_plugin.h:762 __rcu_read_unlock+0x7c/0xd0 kernel/rcu/tree_plugin.h:426 rcu_read_unlock include/linux/rcupdate.h:818 [inline] mt_find+0x400/0x650 lib/maple_tree.c:6567 find_vma+0x134/0x1b0 mm/mmap.c:1888 lock_mm_and_find_vma+0x5f/0x2f0 mm/memory.c:5443 do_user_addr_fault+0x36c/0x12c0 arch/x86/mm/fault.c:1343 handle_page_fault arch/x86/mm/fault.c:1463 [inline] exc_page_fault+0x64/0x100 arch/x86/mm/fault.c:1516 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:608 RIP: 0010:__get_user_4+0x11/0x20 arch/x86/lib/getuser.S:81 Code: 48 c1 fa 3f 48 09 d0 0f 01 cb 0f b7 10 31 c0 0f 01 ca c3 90 90 90 90 90 90 f3 0f 1e fa 48 89 c2 48 c1 fa 3f 48 09 d0 0f 01 cb <8b> 10 31 c0 0f 01 ca c3 90 90 90 90 90 90 90 f3 0f 1e fa 48 89 c2 RSP: 0018:ffffc900034b7ce0 EFLAGS: 00050202 RAX: 0000000000000004 RBX: ffffc900034b7de0 RCX: 6eaa1d53b1183d00 RDX: 0000000000000000 RSI: ffffffff8acadd60 RDI: ffffffff8b1c9c20 RBP: ffffc900034b7f10 R08: ffffffff8e8b666f R09: 1ffffffff1d16ccd R10: dffffc0000000000 R11: fffffbfff1d16cce R12: 0000000000000000 R13: 0000000000000004 R14: ffffc900034b7de0 R15: 0000000000000000 perf_copy_attr+0x45/0x840 kernel/events/core.c:12321 __do_sys_perf_event_open kernel/events/core.c:12632 [inline] __se_sys_perf_event_open+0x11b/0x1c50 kernel/events/core.c:12609 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7f5aa8d9ce59 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:00007ffd16b31378 EFLAGS: 00000246 ORIG_RAX: 000000000000012a RAX: ffffffffffffffda RBX: 00007f5aa9015fa0 RCX: 00007f5aa8d9ce59 RDX: ffffffffffffffff RSI: 0000000000000000 RDI: 0000000000000000 RBP: 00007f5aa8e32d6f R08: 0000000000000000 R09: 0000000000000000 R10: ffffffffffffffff R11: 0000000000000246 R12: 0000000000000000 R13: 00007f5aa9015fac R14: 00007f5aa9015fa0 R15: 00007f5aa9015fa0