================================================================== BUG: KCSAN: data-race in virtqueue_disable_cb / virtqueue_disable_cb read to 0xffff888103082a78 of 2 bytes by interrupt on cpu 1: virtqueue_disable_cb_split drivers/virtio/virtio_ring.c:873 [inline] virtqueue_disable_cb+0x58/0x150 drivers/virtio/virtio_ring.c:2566 skb_xmit_done+0x65/0x140 drivers/net/virtio_net.c:755 vring_interrupt+0x152/0x180 drivers/virtio/virtio_ring.c:2715 __handle_irq_event_percpu+0x90/0x440 kernel/irq/handle.c:158 handle_irq_event_percpu kernel/irq/handle.c:193 [inline] handle_irq_event+0x64/0xf0 kernel/irq/handle.c:210 handle_edge_irq+0x188/0x4f0 kernel/irq/chip.c:789 generic_handle_irq_desc include/linux/irqdesc.h:173 [inline] handle_irq arch/x86/kernel/irq.c:254 [inline] call_irq_handler arch/x86/kernel/irq.c:266 [inline] __common_interrupt+0x60/0x100 arch/x86/kernel/irq.c:292 common_interrupt+0x3e/0x90 arch/x86/kernel/irq.c:285 asm_common_interrupt+0x26/0x40 arch/x86/include/asm/idtentry.h:693 check_kcov_mode kernel/kcov.c:183 [inline] write_comp_data kernel/kcov.c:246 [inline] __sanitizer_cov_trace_const_cmp1+0x2f/0x90 kernel/kcov.c:300 skb_cloned include/linux/skbuff.h:1984 [inline] skb_try_coalesce+0x69/0x7f0 net/core/skbuff.c:6072 tcp_add_backlog+0x8d0/0xbd0 net/ipv4/tcp_ipv4.c:2084 tcp_v4_rcv+0x1a33/0x1f60 net/ipv4/tcp_ipv4.c:2365 ip_protocol_deliver_rcu+0x397/0x780 net/ipv4/ip_input.c:205 ip_local_deliver_finish+0x184/0x220 net/ipv4/ip_input.c:233 NF_HOOK include/linux/netfilter.h:317 [inline] ip_local_deliver+0xe8/0x1c0 net/ipv4/ip_input.c:254 dst_input include/net/dst.h:469 [inline] ip_sublist_rcv_finish net/ipv4/ip_input.c:578 [inline] ip_list_rcv_finish net/ipv4/ip_input.c:627 [inline] ip_sublist_rcv+0x56b/0x650 net/ipv4/ip_input.c:635 ip_list_rcv+0x261/0x290 net/ipv4/ip_input.c:669 __netif_receive_skb_list_ptype net/core/dev.c:6020 [inline] __netif_receive_skb_list_core+0x4dc/0x500 net/core/dev.c:6067 __netif_receive_skb_list net/core/dev.c:6119 [inline] netif_receive_skb_list_internal+0x487/0x600 net/core/dev.c:6210 gro_normal_list include/net/gro.h:532 [inline] napi_complete_done+0x1a3/0x410 net/core/dev.c:6580 virtqueue_napi_complete drivers/net/virtio_net.c:737 [inline] virtnet_poll+0x189f/0x1d10 drivers/net/virtio_net.c:3053 __napi_poll+0x66/0x3a0 net/core/dev.c:7414 napi_poll net/core/dev.c:7478 [inline] net_rx_action+0x391/0x830 net/core/dev.c:7605 handle_softirqs+0xb7/0x290 kernel/softirq.c:579 __do_softirq kernel/softirq.c:613 [inline] invoke_softirq kernel/softirq.c:453 [inline] __irq_exit_rcu+0x3a/0xc0 kernel/softirq.c:680 common_interrupt+0x83/0x90 arch/x86/kernel/irq.c:285 asm_common_interrupt+0x26/0x40 arch/x86/include/asm/idtentry.h:693 __sanitizer_cov_trace_const_cmp8+0x8/0x90 kernel/kcov.c:322 pte_none arch/x86/include/asm/pgtable.h:989 [inline] do_zap_pte_range mm/memory.c:1678 [inline] zap_pte_range mm/memory.c:1733 [inline] zap_pmd_range mm/memory.c:1825 [inline] zap_pud_range mm/memory.c:1854 [inline] zap_p4d_range mm/memory.c:1875 [inline] unmap_page_range+0x79d/0x29a0 mm/memory.c:1896 unmap_single_vma mm/memory.c:1939 [inline] unmap_vmas+0x23d/0x3a0 mm/memory.c:1983 exit_mmap+0x1b0/0x6c0 mm/mmap.c:1284 __mmput+0x28/0x1c0 kernel/fork.c:1121 mmput+0x40/0x50 kernel/fork.c:1144 exit_mm+0xe4/0x190 kernel/exit.c:581 do_exit+0x40b/0x1590 kernel/exit.c:943 do_group_exit+0x139/0x140 kernel/exit.c:1104 __do_sys_exit_group kernel/exit.c:1115 [inline] __se_sys_exit_group kernel/exit.c:1113 [inline] __x64_sys_exit_group+0x1f/0x20 kernel/exit.c:1113 x64_sys_call+0x2fa4/0x2fb0 arch/x86/include/generated/asm/syscalls_64.h:232 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xd2/0x200 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f write to 0xffff888103082a78 of 2 bytes by task 3306 on cpu 0: virtqueue_disable_cb_split drivers/virtio/virtio_ring.c:874 [inline] virtqueue_disable_cb+0x7a/0x150 drivers/virtio/virtio_ring.c:2566 start_xmit+0x102/0x12c0 drivers/net/virtio_net.c:3298 __netdev_start_xmit include/linux/netdevice.h:5215 [inline] netdev_start_xmit include/linux/netdevice.h:5224 [inline] xmit_one net/core/dev.c:3830 [inline] dev_hard_start_xmit+0x122/0x3e0 net/core/dev.c:3846 sch_direct_xmit+0x192/0x550 net/sched/sch_generic.c:344 __dev_xmit_skb net/core/dev.c:4102 [inline] __dev_queue_xmit+0xe4f/0x1fb0 net/core/dev.c:4679 dev_queue_xmit include/linux/netdevice.h:3355 [inline] neigh_hh_output include/net/neighbour.h:523 [inline] neigh_output include/net/neighbour.h:537 [inline] ip_finish_output2+0x77f/0x8b0 net/ipv4/ip_output.c:235 __ip_finish_output net/ipv4/ip_output.c:-1 [inline] ip_finish_output+0x112/0x290 net/ipv4/ip_output.c:323 NF_HOOK_COND include/linux/netfilter.h:306 [inline] ip_output+0xad/0x170 net/ipv4/ip_output.c:433 dst_output include/net/dst.h:459 [inline] ip_local_out net/ipv4/ip_output.c:129 [inline] __ip_queue_xmit+0xb25/0xb40 net/ipv4/ip_output.c:527 ip_queue_xmit+0x39/0x50 net/ipv4/ip_output.c:541 __tcp_transmit_skb+0x1641/0x1a60 net/ipv4/tcp_output.c:1479 __tcp_send_ack+0x227/0x350 net/ipv4/tcp_output.c:4279 tcp_send_ack+0x29/0x30 net/ipv4/tcp_output.c:4285 __tcp_cleanup_rbuf+0xd3/0x2c0 net/ipv4/tcp.c:1544 tcp_cleanup_rbuf net/ipv4/tcp.c:1555 [inline] tcp_recvmsg_locked+0x1aec/0x1fd0 net/ipv4/tcp.c:2878 tcp_recvmsg+0x12e/0x490 net/ipv4/tcp.c:2908 inet_recvmsg+0xb7/0x290 net/ipv4/af_inet.c:883 sock_recvmsg_nosec net/socket.c:1017 [inline] sock_recvmsg+0xf6/0x170 net/socket.c:1039 sock_read_iter+0x152/0x1a0 net/socket.c:1109 new_sync_read fs/read_write.c:491 [inline] vfs_read+0x5ca/0x6f0 fs/read_write.c:572 ksys_read+0xda/0x1a0 fs/read_write.c:715 __do_sys_read fs/read_write.c:724 [inline] __se_sys_read fs/read_write.c:722 [inline] __x64_sys_read+0x40/0x50 fs/read_write.c:722 x64_sys_call+0x2d77/0x2fb0 arch/x86/include/generated/asm/syscalls_64.h:1 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xd2/0x200 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: 3306 Comm: syz-executor Not tainted 6.15.0-syzkaller-10815-gbb1556ec9464 #0 PREEMPT(voluntary) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 ==================================================================