rcu: INFO: rcu_preempt self-detected stall on CPU rcu: 0-....: (1 GPs behind) idle=0434/1/0x4000000000000000 softirq=42636/42637 fqs=1003 rcu: hardirqs softirqs csw/system rcu: number: 1671018 0 0 rcu: cputime: 13117 39368 45 ==> 52490(ms) rcu: (t=10500 jiffies g=51205 q=1992 ncpus=2) CPU: 0 PID: 13490 Comm: syz.1.2154 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026 RIP: 0010:__sanitizer_cov_trace_const_cmp4+0x82/0x90 kernel/kcov.c:315 Code: 8d 52 28 4d 39 ca 77 22 89 ff 89 f6 49 ff c0 4c 89 01 48 c7 44 11 08 05 00 00 00 48 89 7c 11 10 48 89 74 11 18 48 89 44 11 20 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 f3 0f 1e fa 48 8b 04 24 RSP: 0018:ffffc90000006938 EFLAGS: 00000246 RAX: ffffffff813b2298 RBX: ffffc900000069b0 RCX: 0000000000000100 RDX: ffff88805b980000 RSI: 0000000000000001 RDI: 0000000000000000 RBP: 0000000000000001 R08: ffff88805b980000 R09: 0000000000000003 R10: 0000000000000004 R11: 0000000000000100 R12: ffffffff8a8bdd53 R13: ffffc90000006d90 R14: dffffc0000000000 R15: 1ffff92000000d36 FS: 00007fca085216c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055555d83fa38 CR3: 000000005fdcb000 CR4: 00000000003506f0 DR0: 0000200000000300 DR1: 0000200000000300 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: unwind_get_return_address+0x68/0xc0 arch/x86/kernel/unwind_orc.c:369 arch_stack_walk+0x11d/0x190 arch/x86/kernel/stacktrace.c:26 stack_trace_save+0xaa/0x100 kernel/stacktrace.c:122 kasan_save_stack mm/kasan/common.c:46 [inline] kasan_set_track+0x4e/0x70 mm/kasan/common.c:53 kasan_save_free_info+0x28/0x40 mm/kasan/generic.c:522 ____kasan_slab_free+0x126/0x1f0 mm/kasan/common.c:237 kasan_slab_free include/linux/kasan.h:164 [inline] slab_free_hook mm/slub.c:1811 [inline] slab_free_freelist_hook+0x130/0x1a0 mm/slub.c:1837 slab_free mm/slub.c:3830 [inline] kmem_cache_free+0xf8/0x290 mm/slub.c:3852 packet_rcv+0x15b/0x1420 net/packet/af_packet.c:2278 dev_queue_xmit_nit+0xb0c/0xba0 net/core/dev.c:2385 xmit_one net/core/dev.c:3640 [inline] dev_hard_start_xmit+0x150/0x790 net/core/dev.c:3660 sch_direct_xmit+0x251/0x4a0 net/sched/sch_generic.c:345 __dev_xmit_skb net/core/dev.c:3881 [inline] __dev_queue_xmit+0x162a/0x3630 net/core/dev.c:4416 NF_HOOK+0x331/0x3b0 include/linux/netfilter.h:-1 arp_xmit+0x16c/0x270 net/ipv4/arp.c:664 arp_process+0x13ba/0x17b0 net/ipv4/arp.c:854 NF_HOOK+0x331/0x3b0 include/linux/netfilter.h:-1 __netif_receive_skb_list_ptype net/core/dev.c:5694 [inline] __netif_receive_skb_list_core+0x428/0x770 net/core/dev.c:5727 __netif_receive_skb_list net/core/dev.c:5789 [inline] netif_receive_skb_list_internal+0x943/0xca0 net/core/dev.c:5880 gro_normal_list include/net/gro.h:451 [inline] gro_normal_one include/net/gro.h:464 [inline] napi_skb_finish net/core/gro.c:580 [inline] napi_gro_receive+0x553/0xaf0 net/core/gro.c:610 receive_buf+0x219d/0x37a0 drivers/net/virtio_net.c:1870 virtnet_receive drivers/net/virtio_net.c:2155 [inline] virtnet_poll+0x60e/0x11e0 drivers/net/virtio_net.c:2229 __napi_poll+0xbb/0x460 net/core/dev.c:6650 napi_poll net/core/dev.c:6717 [inline] net_rx_action+0x65f/0xcc0 net/core/dev.c:6853 handle_softirqs+0x27d/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:check_preemption_disabled+0x3/0x110 lib/smp_processor_id.c:13 Code: ff ff ff cc cc cc cc f3 0f 1e fa 48 c7 c7 c0 f9 1c 8b 48 c7 c6 00 fa 1c 8b eb 0c 66 2e 0f 1f 84 00 00 00 00 00 66 90 55 41 57 <41> 56 53 48 83 ec 10 65 48 8b 04 25 28 00 00 00 48 89 44 24 08 65 RSP: 0018:ffffc9000f9477a8 EFLAGS: 00000a06 RAX: f3f3f3f3f8f8f2f2 RBX: ffffffff8a9413f0 RCX: 1ffff92001f28f18 RDX: ffffc9000d009000 RSI: ffffffff8b1cfa00 RDI: ffffffff8b1cf9c0 RBP: ffffc9000f9479d0 R08: ffffffff911e75ff R09: 1ffffffff223cebf R10: dffffc0000000000 R11: fffffbfff223cec0 R12: 0000000000000001 R13: dffffc0000000000 R14: dffffc0000000000 R15: ffffc9000f947950 __schedule+0xb3/0x4660 kernel/sched/core.c:6587 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 smp_call_function_single+0x48d/0x5a0 kernel/smp.c:652 task_function_call kernel/events/core.c:120 [inline] perf_install_in_context+0x5bb/0x920 kernel/events/core.c:2951 __do_sys_perf_event_open kernel/events/core.c:12949 [inline] __se_sys_perf_event_open+0x1841/0x1c60 kernel/events/core.c:12601 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: 0033:0x7fca0759de59 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:00007fca08521028 EFLAGS: 00000246 ORIG_RAX: 000000000000012a RAX: ffffffffffffffda RBX: 00007fca07825fa0 RCX: 00007fca0759de59 RDX: ffffffffffffffff RSI: 0000000000000000 RDI: 0000200000000140 RBP: 00007fca07633e6f R08: 0000000000000002 R09: 0000000000000000 R10: ffffffffffffffff R11: 0000000000000246 R12: 0000000000000000 R13: 00007fca07826038 R14: 00007fca07825fa0 R15: 00007fff04982208