================================================================== BUG: KCSAN: data-race in virtqueue_disable_cb / virtqueue_get_buf_ctx read to 0xffff8881295e6130 of 2 bytes by interrupt on cpu 1: virtqueue_get_buf_ctx_split drivers/virtio/virtio_ring.c:725 [inline] virtqueue_get_buf_ctx+0x4da/0x5c0 drivers/virtio/virtio_ring.c:1900 virtqueue_get_buf+0x29/0x40 drivers/virtio/virtio_ring.c:1906 free_old_xmit_skbs+0x9e/0x170 drivers/net/virtio_net.c:1359 start_xmit+0xd3/0xbe0 drivers/net/virtio_net.c:1562 __netdev_start_xmit include/linux/netdevice.h:4447 [inline] netdev_start_xmit include/linux/netdevice.h:4461 [inline] xmit_one net/core/dev.c:3420 [inline] dev_hard_start_xmit+0xef/0x430 net/core/dev.c:3436 sch_direct_xmit+0x2b3/0x900 net/sched/sch_generic.c:313 __dev_xmit_skb net/core/dev.c:3621 [inline] __dev_queue_xmit+0x13e2/0x1ba0 net/core/dev.c:3982 dev_queue_xmit+0x21/0x30 net/core/dev.c:4046 neigh_hh_output include/net/neighbour.h:500 [inline] neigh_output include/net/neighbour.h:509 [inline] ip_finish_output2+0x89b/0xea0 net/ipv4/ip_output.c:228 __ip_finish_output net/ipv4/ip_output.c:308 [inline] __ip_finish_output+0x23a/0x490 net/ipv4/ip_output.c:290 ip_finish_output+0x41/0x160 net/ipv4/ip_output.c:318 NF_HOOK_COND include/linux/netfilter.h:296 [inline] ip_output+0xfe/0x230 net/ipv4/ip_output.c:432 dst_output include/net/dst.h:436 [inline] ip_local_out+0x74/0x90 net/ipv4/ip_output.c:125 __ip_queue_xmit+0x3a8/0xa40 net/ipv4/ip_output.c:532 ip_queue_xmit+0x45/0x60 include/net/ip.h:237 __tcp_transmit_skb+0xea3/0x1df0 net/ipv4/tcp_output.c:1170 __tcp_send_ack+0x246/0x300 net/ipv4/tcp_output.c:3697 tcp_send_ack+0x34/0x40 net/ipv4/tcp_output.c:3703 __tcp_ack_snd_check+0xd9/0x580 net/ipv4/tcp_input.c:5243 tcp_rcv_established+0xce9/0xf50 net/ipv4/tcp_input.c:5674 tcp_v4_do_rcv+0x3b5/0x520 net/ipv4/tcp_ipv4.c:1562 tcp_v4_rcv+0x1b2a/0x1d20 net/ipv4/tcp_ipv4.c:1943 ip_protocol_deliver_rcu+0x4d/0x420 net/ipv4/ip_input.c:204 ip_local_deliver_finish+0x110/0x140 net/ipv4/ip_input.c:231 NF_HOOK include/linux/netfilter.h:307 [inline] NF_HOOK include/linux/netfilter.h:301 [inline] ip_local_deliver+0x133/0x210 net/ipv4/ip_input.c:252 dst_input include/net/dst.h:442 [inline] ip_sublist_rcv_finish+0xf8/0x140 net/ipv4/ip_input.c:549 ip_list_rcv_finish net/ipv4/ip_input.c:599 [inline] ip_sublist_rcv+0x418/0x550 net/ipv4/ip_input.c:607 ip_list_rcv+0x2f5/0x322 net/ipv4/ip_input.c:642 __netif_receive_skb_list_ptype net/core/dev.c:5193 [inline] __netif_receive_skb_list_ptype net/core/dev.c:5182 [inline] __netif_receive_skb_list_core+0x350/0x5c0 net/core/dev.c:5241 __netif_receive_skb_list net/core/dev.c:5293 [inline] netif_receive_skb_list_internal+0x5d8/0x830 net/core/dev.c:5388 gro_normal_list.part.0+0x3a/0xb0 net/core/dev.c:5810 gro_normal_list net/core/dev.c:6216 [inline] napi_complete_done+0x1e4/0x3c0 net/core/dev.c:6203 virtqueue_napi_complete+0x3a/0xa0 drivers/net/virtio_net.c:329 virtnet_poll+0x7a6/0x7d0 drivers/net/virtio_net.c:1432 napi_poll net/core/dev.c:6532 [inline] net_rx_action+0x3ae/0xa90 net/core/dev.c:6600 __do_softirq+0x115/0x33f kernel/softirq.c:292 invoke_softirq kernel/softirq.c:373 [inline] irq_exit+0xbb/0xe0 kernel/softirq.c:413 exiting_irq arch/x86/include/asm/apic.h:536 [inline] do_IRQ+0x81/0x130 arch/x86/kernel/irq.c:263 ret_from_intr+0x0/0x21 copy_pte_range mm/memory.c:837 [inline] copy_pmd_range mm/memory.c:892 [inline] copy_pud_range mm/memory.c:926 [inline] copy_p4d_range mm/memory.c:948 [inline] copy_page_range+0x9fd/0x19b0 mm/memory.c:1010 dup_mmap kernel/fork.c:604 [inline] dup_mm+0x74a/0xba0 kernel/fork.c:1360 copy_mm kernel/fork.c:1416 [inline] copy_process+0x3138/0x3c40 kernel/fork.c:2072 _do_fork+0xfe/0x7a0 kernel/fork.c:2421 __do_sys_clone kernel/fork.c:2576 [inline] __se_sys_clone kernel/fork.c:2557 [inline] __x64_sys_clone+0x130/0x170 kernel/fork.c:2557 do_syscall_64+0xcc/0x3a0 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x44/0xa9 write to 0xffff8881295e6130 of 2 bytes by interrupt on cpu 0: virtqueue_disable_cb_split drivers/virtio/virtio_ring.c:741 [inline] virtqueue_disable_cb+0xe9/0x130 drivers/virtio/virtio_ring.c:1925 skb_xmit_done+0x6a/0x110 drivers/net/virtio_net.c:343 vring_interrupt drivers/virtio/virtio_ring.c:2046 [inline] vring_interrupt+0x1a1/0x1c0 drivers/virtio/virtio_ring.c:2032 __handle_irq_event_percpu+0x9a/0x430 kernel/irq/handle.c:149 handle_irq_event_percpu+0x4b/0xe0 kernel/irq/handle.c:189 handle_irq_event+0x85/0xca kernel/irq/handle.c:206 handle_edge_irq+0x1a4/0x4a0 kernel/irq/chip.c:830 generic_handle_irq_desc include/linux/irqdesc.h:156 [inline] do_IRQ+0x7c/0x130 arch/x86/kernel/irq.c:250 ret_from_intr+0x0/0x21 arch_local_irq_restore arch/x86/include/asm/paravirt.h:752 [inline] rcu_nocb_unlock_irqrestore kernel/rcu/tree_plugin.h:2463 [inline] rcu_do_batch+0x199/0x5b0 kernel/rcu/tree.c:2176 rcu_core+0x365/0x4c0 kernel/rcu/tree.c:2408 rcu_core_si+0x12/0x20 kernel/rcu/tree.c:2417 __do_softirq+0x115/0x33f kernel/softirq.c:292 invoke_softirq kernel/softirq.c:373 [inline] irq_exit+0xbb/0xe0 kernel/softirq.c:413 exiting_irq arch/x86/include/asm/apic.h:536 [inline] smp_apic_timer_interrupt+0xe6/0x280 arch/x86/kernel/apic/apic.c:1137 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:829 __tsan_read8+0x1b/0x100 kernel/kcsan/core.c:589 free_pages_and_swap_cache+0x7f/0x2a0 mm/swap_state.c:295 tlb_batch_pages_flush mm/mmu_gather.c:49 [inline] tlb_flush_mmu_free mm/mmu_gather.c:184 [inline] tlb_flush_mmu+0x72/0x3b0 mm/mmu_gather.c:191 tlb_finish_mmu+0x80/0x250 mm/mmu_gather.c:272 exit_mmap+0x166/0x300 mm/mmap.c:3142 __mmput kernel/fork.c:1082 [inline] mmput+0xea/0x280 kernel/fork.c:1103 exit_mm kernel/exit.c:485 [inline] do_exit+0x4ac/0x18c0 kernel/exit.c:784 do_group_exit+0xb4/0x1c0 kernel/exit.c:895 __do_sys_exit_group kernel/exit.c:906 [inline] __se_sys_exit_group kernel/exit.c:904 [inline] __x64_sys_exit_group+0x2e/0x30 kernel/exit.c:904 do_syscall_64+0xcc/0x3a0 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 17775 Comm: syz-executor.3 Not tainted 5.5.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================