rcu: INFO: rcu_preempt self-detected stall on CPU rcu: 0-....: (4086 ticks this GP) idle=89cc/1/0x4000000000000000 softirq=12261/12263 fqs=4717 rcu: hardirqs softirqs csw/system rcu: number: 1134825 13 0 rcu: cputime: 12387 28451 32 ==> 40840(ms) rcu: (t=10500 jiffies g=11733 q=1475 ncpus=2) CPU: 0 PID: 5983 Comm: syz.0.17 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 RIP: 0010:__sanitizer_cov_trace_const_cmp4+0x0/0x90 kernel/kcov.c:314 Code: c0 4c 89 01 48 c7 44 11 08 03 00 00 00 48 89 7c 11 10 48 89 74 11 18 48 89 44 11 20 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 0f 1e fa 48 8b 04 24 65 48 8b 15 40 21 7e 7e 65 8b 0d 41 21 7e RSP: 0018:ffffc90000006850 EFLAGS: 00000246 RAX: 0000000000000000 RBX: 1ffff92000000d25 RCX: ffff888021c03c00 RDX: 0000000000000100 RSI: 0000000000000002 RDI: 0000000000000000 RBP: 0000000000000002 R08: ffffc900000069f0 R09: 0000000000000009 R10: 0000000000000004 R11: 0000000000000100 R12: ffffc90000006928 R13: dffffc0000000000 R14: ffffc90000006960 R15: ffffffff8886fa02 FS: 00007fc5606836c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b2f563fff CR3: 0000000078af1000 CR4: 00000000003506f0 Call Trace: unwind_done arch/x86/include/asm/unwind.h:50 [inline] unwind_next_frame+0x9f/0x2970 arch/x86/kernel/unwind_orc.c:475 arch_stack_walk+0x144/0x190 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0x9c/0xe0 kernel/stacktrace.c:122 kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4e/0x70 mm/kasan/common.c:52 kasan_save_free_info+0x2e/0x50 mm/kasan/generic.c:522 ____kasan_slab_free+0x126/0x1e0 mm/kasan/common.c:236 kasan_slab_free include/linux/kasan.h:164 [inline] slab_free_hook mm/slub.c:1811 [inline] slab_free_freelist_hook+0x130/0x1b0 mm/slub.c:1837 slab_free mm/slub.c:3830 [inline] kmem_cache_free+0xf8/0x280 mm/slub.c:3852 dev_kfree_skb_any_reason+0x10c/0x120 net/core/dev.c:3228 free_old_xmit_skbs+0x114/0x3c0 drivers/net/virtio_net.c:780 start_xmit+0x161/0x1420 drivers/net/virtio_net.c:2420 __netdev_start_xmit include/linux/netdevice.h:4943 [inline] netdev_start_xmit include/linux/netdevice.h:4957 [inline] xmit_one net/core/dev.c:3619 [inline] dev_hard_start_xmit+0x246/0x740 net/core/dev.c:3635 sch_direct_xmit+0x252/0x4a0 net/sched/sch_generic.c:345 __dev_xmit_skb net/core/dev.c:3856 [inline] __dev_queue_xmit+0x173e/0x35a0 net/core/dev.c:4391 NF_HOOK+0x307/0x390 include/linux/netfilter.h:-1 arp_xmit+0x16c/0x270 net/ipv4/arp.c:663 arp_process+0x1394/0x1780 net/ipv4/arp.c:853 NF_HOOK+0x307/0x390 include/linux/netfilter.h:-1 __netif_receive_skb_list_ptype net/core/dev.c:5656 [inline] __netif_receive_skb_list_core+0x6df/0x740 net/core/dev.c:5699 __netif_receive_skb_list net/core/dev.c:5751 [inline] netif_receive_skb_list_internal+0x91b/0xc60 net/core/dev.c:5842 gro_normal_list include/net/gro.h:451 [inline] napi_complete_done+0x32a/0x810 net/core/dev.c:6182 virtqueue_napi_complete drivers/net/virtio_net.c:450 [inline] virtnet_poll+0xa44/0x1180 drivers/net/virtio_net.c:2236 __napi_poll+0xc0/0x460 net/core/dev.c:6612 napi_poll net/core/dev.c:6679 [inline] net_rx_action+0x5ea/0xbf0 net/core/dev.c:6815 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:generic_exec_single+0x476/0x4f0 kernel/smp.c:418 Code: 75 11 e8 cd e6 0a 00 48 85 db 75 16 e8 c3 e6 0a 00 eb 15 e8 bc e6 0a 00 e8 c7 73 f4 08 48 85 db 74 ea e8 ad e6 0a 00 fb 31 c0 <48> c7 44 24 20 0e 36 e0 45 4b c7 04 2c 00 00 00 00 66 43 c7 44 2c RSP: 0018:ffffc90003297a00 EFLAGS: 00000246 RAX: 0000000000000000 RBX: 0000000000000200 RCX: ffff888021c03c00 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffc90003297ad0 R08: ffffffff90da95f7 R09: 1ffffffff21b52be R10: dffffc0000000000 R11: fffffbfff21b52bf R12: 1ffff92000652f44 R13: dffffc0000000000 R14: 0000000000000000 R15: 1ffff92000652f65 smp_call_function_single+0x352/0x580 kernel/smp.c:647 task_function_call kernel/events/core.c:120 [inline] perf_install_in_context+0x591/0x8e0 kernel/events/core.c:2948 __do_sys_perf_event_open kernel/events/core.c:12915 [inline] __se_sys_perf_event_open+0x17fa/0x1c20 kernel/events/core.c:12567 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: 0033:0x7fc55f78f749 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:00007fc560683038 EFLAGS: 00000246 ORIG_RAX: 000000000000012a RAX: ffffffffffffffda RBX: 00007fc55f9e5fa0 RCX: 00007fc55f78f749 RDX: ffffffffffffffff RSI: 0000000000000000 RDI: 0000200000000140 RBP: 00007fc55f813f91 R08: 0000000000000000 R09: 0000000000000000 R10: ffffffffffffffff R11: 0000000000000246 R12: 0000000000000000 R13: 00007fc55f9e6038 R14: 00007fc55f9e5fa0 R15: 00007ffec06fd208