rcu: INFO: rcu_preempt self-detected stall on CPU rcu: 0-....: (10492 ticks this GP) idle=6d04/1/0x4000000000000000 softirq=29861/29866 fqs=2964 rcu: hardirqs softirqs csw/system rcu: number: 1479235 0 0 rcu: cputime: 15451 37038 44 ==> 52510(ms) rcu: (t=10503 jiffies g=32681 q=2494 ncpus=2) CPU: 0 PID: 10332 Comm: syz.0.1585 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025 RIP: 0010:__sanitizer_cov_trace_pc+0x0/0x60 kernel/kcov.c:212 Code: 00 0f 0b 0f 1f 80 00 00 00 00 f3 0f 1e fa 53 48 89 fb e8 13 00 00 00 48 8b 3d dc ef c4 0c 48 89 de 5b e9 13 9e 56 00 cc cc cc 0f 1e fa 48 8b 04 24 65 48 8b 0d 30 15 7e 7e 65 8b 15 31 15 7e RSP: 0018:ffffc90000005e90 EFLAGS: 00000212 RAX: ffffffff8eb29bb8 RBX: ffffffff8eb29bbc RCX: ffff88802b0f5a00 RDX: 0000000000000100 RSI: ffffffff88ea3b27 RDI: ffffffff88ea30f8 RBP: ffffffff8eb29bbc R08: ffffc90000006030 R09: 0000000000000016 R10: 0000000000000004 R11: 0000000000000100 R12: ffffffff8eb29bc0 R13: ffffffff88ea30f8 R14: ffffffff88ea3b27 R15: ffffffff8eb29bbc FS: 00007f534cdbe6c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000100000000 CR3: 0000000034e69000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: __orc_find arch/x86/kernel/unwind_orc.c:99 [inline] orc_find arch/x86/kernel/unwind_orc.c:227 [inline] unwind_next_frame+0x501/0x2970 arch/x86/kernel/unwind_orc.c:494 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 skb_kfree_head net/core/skbuff.c:947 [inline] skb_free_head net/core/skbuff.c:961 [inline] skb_release_data+0x60a/0x800 net/core/skbuff.c:991 skb_release_all net/core/skbuff.c:1057 [inline] __kfree_skb net/core/skbuff.c:1071 [inline] kfree_skb_reason+0x10e/0x170 net/core/skbuff.c:1107 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 neigh_output include/net/neighbour.h:543 [inline] ip_finish_output2+0xd21/0x11d0 net/ipv4/ip_output.c:235 dst_output include/net/dst.h:467 [inline] ip_local_out net/ipv4/ip_output.c:129 [inline] __ip_queue_xmit+0x10aa/0x1a10 net/ipv4/ip_output.c:535 __tcp_transmit_skb+0x1c97/0x32a0 net/ipv4/tcp_output.c:1422 tcp_ack_snd_check net/ipv4/tcp_input.c:5728 [inline] tcp_rcv_established+0xb00/0x1cf0 net/ipv4/tcp_input.c:6174 tcp_v4_do_rcv+0x4ed/0xb80 net/ipv4/tcp_ipv4.c:1734 tcp_v4_rcv+0x2334/0x2a50 net/ipv4/tcp_ipv4.c:2166 ip_protocol_deliver_rcu+0x20e/0x3f0 net/ipv4/ip_input.c:205 ip_local_deliver_finish+0x2ca/0x510 net/ipv4/ip_input.c:233 NF_HOOK+0x303/0x390 include/linux/netfilter.h:304 dst_input include/net/dst.h:477 [inline] ip_sublist_rcv_finish net/ipv4/ip_input.c:580 [inline] ip_list_rcv_finish net/ipv4/ip_input.c:631 [inline] ip_sublist_rcv+0xa38/0xd20 net/ipv4/ip_input.c:639 ip_list_rcv+0x3e3/0x430 net/ipv4/ip_input.c:674 __netif_receive_skb_list_ptype net/core/dev.c:5651 [inline] __netif_receive_skb_list_core+0x2cc/0x740 net/core/dev.c:5689 __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] gro_normal_one include/net/gro.h:464 [inline] napi_skb_finish net/core/gro.c:573 [inline] napi_gro_receive+0x565/0xb00 net/core/gro.c:603 receive_buf+0x218c/0x3780 drivers/net/virtio_net.c:1870 virtnet_receive drivers/net/virtio_net.c:2155 [inline] virtnet_poll+0x61f/0x1180 drivers/net/virtio_net.c:2229 __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:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline] RIP: 0010:_raw_spin_unlock_irqrestore+0xa9/0x110 kernel/locking/spinlock.c:194 Code: 74 05 e8 aa 1b 13 f7 48 c7 44 24 20 00 00 00 00 9c 8f 44 24 20 f6 44 24 21 02 75 4b f7 c3 00 02 00 00 74 01 fb bf 01 00 00 00 c2 96 e2 f6 65 8b 05 b3 cd 8a 75 85 c0 74 3c 48 c7 04 24 0e 36 RSP: 0018:ffffc900036f7aa0 EFLAGS: 00000206 RAX: 947eaadd6e435f00 RBX: 0000000000000a02 RCX: 947eaadd6e435f00 RDX: dffffc0000000000 RSI: ffffffff8aaabce0 RDI: 0000000000000001 RBP: ffffc900036f7b28 R08: ffffffff8e4a8e2f R09: 1ffffffff1c951c5 R10: dffffc0000000000 R11: fffffbfff1c951c6 R12: dffffc0000000000 R13: dffffc0000000000 R14: ffff88805c9bb0c0 R15: 1ffff920006def54 finish_task_switch+0x43a/0x920 kernel/sched/core.c:5284 context_switch kernel/sched/core.c:5383 [inline] __schedule+0x14da/0x44d0 kernel/sched/core.c:6699 preempt_schedule_irq+0xb5/0x140 kernel/sched/core.c:7009 irqentry_exit+0x67/0x70 kernel/entry/common.c:438 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687 RIP: 0010:__syscall_enter_from_user_work kernel/entry/common.c:97 [inline] RIP: 0010:syscall_enter_from_user_mode+0x2e/0x80 kernel/entry/common.c:118 Code: 41 56 53 48 89 f3 49 89 fe 48 8b 7c 24 10 e8 e9 fa ff ff 66 90 66 90 e8 80 bf 1c f7 e8 3b bf 1c f7 fb 65 48 8b 05 62 71 94 75 <48> 8b 70 08 40 f6 c6 3f 74 0b 4c 89 f7 5b 41 5e e9 fd 50 03 f7 48 RSP: 0018:ffffc900036f7f08 EFLAGS: 00000286 RAX: ffff88802b0f5a00 RBX: 00000000000000ca RCX: 947eaadd6e435f00 RDX: dffffc0000000000 RSI: ffffffff8aaabce0 RDI: ffffffff8afc6f40 RBP: ffffc900036f7f48 R08: ffffffff8e4a8e2f R09: 1ffffffff1c951c5 R10: dffffc0000000000 R11: fffffbfff1c951c6 R12: 0000000000000000 R13: 0000000000000000 R14: ffffc900036f7f58 R15: 0000000000000000 do_syscall_64+0x28/0xb0 arch/x86/entry/common.c:77 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7f534bf8f749 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:00007f534cdbe0e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: ffffffffffffffda RBX: 00007f534c1e5fa8 RCX: 00007f534bf8f749 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f534c1e5fa8 RBP: 00007f534c1e5fa0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f534c1e6038 R14: 00007ffe9650e850 R15: 00007ffe9650e938