================================================================== BUG: KCSAN: data-race in virtqueue_disable_cb / virtqueue_disable_cb write to 0xffff8881033d5678 of 2 bytes by interrupt on cpu 0: virtqueue_disable_cb_split drivers/virtio/virtio_ring.c:878 [inline] virtqueue_disable_cb+0x7a/0x150 drivers/virtio/virtio_ring.c:2569 skb_xmit_done+0x67/0x1a0 drivers/net/virtio_net.c:783 vring_interrupt+0x155/0x180 drivers/virtio/virtio_ring.c:2718 __handle_irq_event_percpu+0x8b/0x4c0 kernel/irq/handle.c:211 handle_irq_event_percpu kernel/irq/handle.c:248 [inline] handle_irq_event+0x64/0xf0 kernel/irq/handle.c:265 handle_edge_irq+0x154/0x470 kernel/irq/chip.c:855 generic_handle_irq_desc include/linux/irqdesc.h:172 [inline] handle_irq arch/x86/kernel/irq.c:255 [inline] call_irq_handler arch/x86/kernel/irq.c:-1 [inline] __common_interrupt+0x60/0xb0 arch/x86/kernel/irq.c:326 common_interrupt+0x7e/0x90 arch/x86/kernel/irq.c:319 asm_common_interrupt+0x26/0x40 arch/x86/include/asm/idtentry.h:688 __sanitizer_cov_trace_pc+0x8/0x70 kernel/kcov.c:213 stack_not_used kernel/exit.c:800 [inline] check_stack_usage kernel/exit.c:849 [inline] do_exit+0xf35/0x1590 kernel/exit.c:1006 do_group_exit+0x138/0x140 kernel/exit.c:1112 __do_sys_exit_group kernel/exit.c:1123 [inline] __se_sys_exit_group kernel/exit.c:1121 [inline] __x64_sys_exit_group+0x1f/0x20 kernel/exit.c:1121 x64_sys_call+0x2fff/0x3000 arch/x86/include/generated/asm/syscalls_64.h:232 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xc0/0x2a0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f read to 0xffff8881033d5678 of 2 bytes by interrupt on cpu 1: virtqueue_disable_cb_split drivers/virtio/virtio_ring.c:877 [inline] virtqueue_disable_cb+0x58/0x150 drivers/virtio/virtio_ring.c:2569 start_xmit+0x10e/0x1790 drivers/net/virtio_net.c:3331 __netdev_start_xmit include/linux/netdevice.h:5273 [inline] netdev_start_xmit include/linux/netdevice.h:5282 [inline] xmit_one net/core/dev.c:3866 [inline] dev_hard_start_xmit+0x125/0x3e0 net/core/dev.c:3882 sch_direct_xmit+0x192/0x550 net/sched/sch_generic.c:347 __dev_xmit_skb net/core/dev.c:4182 [inline] __dev_queue_xmit+0xcbe/0x1f20 net/core/dev.c:4798 dev_queue_xmit include/linux/netdevice.h:3381 [inline] neigh_hh_output include/net/neighbour.h:540 [inline] neigh_output include/net/neighbour.h:554 [inline] ip_finish_output2+0x77f/0x8b0 net/ipv4/ip_output.c:237 __ip_finish_output net/ipv4/ip_output.c:-1 [inline] ip_finish_output+0x114/0x2a0 net/ipv4/ip_output.c:325 NF_HOOK_COND include/linux/netfilter.h:307 [inline] ip_output+0xbd/0x1c0 net/ipv4/ip_output.c:438 dst_output include/net/dst.h:464 [inline] ip_local_out net/ipv4/ip_output.c:131 [inline] __ip_queue_xmit+0xbb0/0xbf0 net/ipv4/ip_output.c:534 ip_queue_xmit+0x39/0x50 net/ipv4/ip_output.c:548 __tcp_transmit_skb+0x17fd/0x1c10 net/ipv4/tcp_output.c:1631 tcp_transmit_skb net/ipv4/tcp_output.c:1649 [inline] tcp_write_xmit+0x1597/0x3640 net/ipv4/tcp_output.c:3002 __tcp_push_pending_frames+0x6d/0x1b0 net/ipv4/tcp_output.c:3185 tcp_push_pending_frames include/net/tcp.h:2224 [inline] tcp_data_snd_check net/ipv4/tcp_input.c:5896 [inline] tcp_rcv_established+0xc52/0x1220 net/ipv4/tcp_input.c:6476 tcp_v4_do_rcv+0x91d/0xa20 net/ipv4/tcp_ipv4.c:1881 tcp_v4_rcv+0x1c36/0x2020 net/ipv4/tcp_ipv4.c:2324 ip_protocol_deliver_rcu+0x397/0x780 net/ipv4/ip_input.c:207 ip_local_deliver_finish+0x1fc/0x2f0 net/ipv4/ip_input.c:241 NF_HOOK include/linux/netfilter.h:318 [inline] ip_local_deliver+0xe8/0x1e0 net/ipv4/ip_input.c:262 dst_input include/net/dst.h:474 [inline] ip_sublist_rcv_finish net/ipv4/ip_input.c:584 [inline] ip_list_rcv_finish net/ipv4/ip_input.c:636 [inline] ip_sublist_rcv+0x5ce/0x6d0 net/ipv4/ip_input.c:644 ip_list_rcv+0x261/0x290 net/ipv4/ip_input.c:678 __netif_receive_skb_list_ptype net/core/dev.c:6195 [inline] __netif_receive_skb_list_core+0x4dc/0x500 net/core/dev.c:6242 __netif_receive_skb_list net/core/dev.c:6294 [inline] netif_receive_skb_list_internal+0x47d/0x5f0 net/core/dev.c:6385 gro_normal_list include/net/gro.h:524 [inline] gro_flush_normal include/net/gro.h:532 [inline] napi_complete_done+0x19c/0x3f0 net/core/dev.c:6754 virtqueue_napi_complete drivers/net/virtio_net.c:749 [inline] virtnet_poll+0x1bfb/0x2080 drivers/net/virtio_net.c:3091 __napi_poll+0x5f/0x310 net/core/dev.c:7681 napi_poll net/core/dev.c:7744 [inline] net_rx_action+0x452/0x930 net/core/dev.c:7896 handle_softirqs+0xb9/0x280 kernel/softirq.c:622 __do_softirq kernel/softirq.c:656 [inline] invoke_softirq kernel/softirq.c:496 [inline] __irq_exit_rcu+0x39/0xc0 kernel/softirq.c:723 common_interrupt+0x43/0x90 arch/x86/kernel/irq.c:319 asm_common_interrupt+0x26/0x40 arch/x86/include/asm/idtentry.h:688 value changed: 0x0000 -> 0x0001 Reported by Kernel Concurrency Sanitizer on: CPU: 1 UID: 0 PID: 7224 Comm: syz.7.21005 Tainted: G W syzkaller #0 PREEMPT(voluntary) Tainted: [W]=WARN Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 ==================================================================