================================================================== BUG: KCSAN: data-race in virtqueue_disable_cb / virtqueue_disable_cb read to 0xffff88810317eb78 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 skb_xmit_done+0x67/0x1a0 drivers/net/virtio_net.c:800 vring_interrupt+0x155/0x180 drivers/virtio/virtio_ring.c:2718 __handle_irq_event_percpu+0x9d/0x510 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 kcsan_setup_watchpoint+0x415/0x430 kernel/kcsan/core.c:705 file_init_path+0xa7/0x2a0 fs/file_table.c:325 alloc_file fs/file_table.c:356 [inline] alloc_file_pseudo+0x10e/0x160 fs/file_table.c:383 sock_alloc_file+0x9c/0x1e0 net/socket.c:483 sock_map_fd net/socket.c:513 [inline] __sys_socket+0x116/0x180 net/socket.c:1756 __do_sys_socket net/socket.c:1761 [inline] __se_sys_socket net/socket.c:1759 [inline] __x64_sys_socket+0x3f/0x50 net/socket.c:1759 x64_sys_call+0x127b/0x3000 arch/x86/include/generated/asm/syscalls_64.h:42 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xd8/0x2a0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f write to 0xffff88810317eb78 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 start_xmit+0x10e/0x17a0 drivers/net/virtio_net.c:3388 __netdev_start_xmit include/linux/netdevice.h:5273 [inline] netdev_start_xmit include/linux/netdevice.h:5282 [inline] xmit_one net/core/dev.c:3853 [inline] dev_hard_start_xmit+0x125/0x3e0 net/core/dev.c:3869 sch_direct_xmit+0x192/0x550 net/sched/sch_generic.c:347 __dev_xmit_skb net/core/dev.c:4169 [inline] __dev_queue_xmit+0xcb2/0x1ec0 net/core/dev.c:4783 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/0x190 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+0xbbf/0xc00 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+0x1477/0x3150 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+0xc52/0x1230 net/ipv4/tcp_input.c:6476 tcp_v4_do_rcv+0x91d/0xa20 net/ipv4/tcp_ipv4.c:1881 tcp_v4_rcv+0x1bb3/0x1f60 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+0xe8/0x1c0 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/0x6c0 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:6180 [inline] __netif_receive_skb_list_core+0x4dc/0x500 net/core/dev.c:6227 __netif_receive_skb_list net/core/dev.c:6279 [inline] netif_receive_skb_list_internal+0x487/0x600 net/core/dev.c:6370 gro_normal_list include/net/gro.h:524 [inline] gro_flush_normal include/net/gro.h:532 [inline] napi_complete_done+0x19c/0x420 net/core/dev.c:6739 virtqueue_napi_complete drivers/net/virtio_net.c:766 [inline] virtnet_poll+0x191c/0x1d90 drivers/net/virtio_net.c:3144 __napi_poll+0x5f/0x300 net/core/dev.c:7666 napi_poll net/core/dev.c:7729 [inline] net_rx_action+0x425/0x8c0 net/core/dev.c:7881 handle_softirqs+0xba/0x290 kernel/softirq.c:622 __do_softirq kernel/softirq.c:656 [inline] invoke_softirq kernel/softirq.c:496 [inline] __irq_exit_rcu+0x3a/0xc0 kernel/softirq.c:723 common_interrupt+0x83/0x90 arch/x86/kernel/irq.c:319 asm_common_interrupt+0x26/0x40 arch/x86/include/asm/idtentry.h:688 kcsan_setup_watchpoint+0x415/0x430 kernel/kcsan/core.c:705 ___sys_recvmsg+0x5c/0x370 net/socket.c:2845 do_recvmmsg+0x1ef/0x540 net/socket.c:2949 __sys_recvmmsg net/socket.c:3023 [inline] __do_sys_recvmmsg net/socket.c:3046 [inline] __se_sys_recvmmsg net/socket.c:3039 [inline] __x64_sys_recvmmsg+0xe5/0x170 net/socket.c:3039 x64_sys_call+0x2b75/0x3000 arch/x86/include/generated/asm/syscalls_64.h:300 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xd8/0x2a0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f value changed: 0x0000 -> 0x0001 Reported by Kernel Concurrency Sanitizer on: CPU: 0 UID: 0 PID: 7458 Comm: syz.5.1190 Tainted: G W syzkaller #0 PREEMPT(voluntary) Tainted: [W]=WARN Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 ==================================================================