================================================================== BUG: KCSAN: data-race in virtqueue_get_buf_ctx / vring_interrupt write to 0xffff8881297821c8 of 2 bytes by interrupt on cpu 1: virtqueue_get_buf_ctx_split drivers/virtio/virtio_ring.c:721 [inline] virtqueue_get_buf_ctx+0x4cc/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 run_ksoftirqd+0x46/0x60 kernel/softirq.c:603 smpboot_thread_fn+0x37d/0x4a0 kernel/smpboot.c:165 kthread+0x1d4/0x200 drivers/block/aoe/aoecmd.c:1253 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:352 read to 0xffff8881297821c8 of 2 bytes by interrupt on cpu 0: more_used drivers/virtio/virtio_ring.c:2029 [inline] vring_interrupt+0x36/0x1c0 drivers/virtio/virtio_ring.c:2036 __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 __sanitizer_cov_trace_pc+0x0/0x50 kernel/kcov.c:915 vsnprintf+0xc9/0xb40 lib/vsprintf.c:2526 snprintf+0x6f/0xa0 lib/vsprintf.c:2707 tomoyo_print_header security/tomoyo/audit.c:165 [inline] tomoyo_init_log+0x372/0x10d0 security/tomoyo/audit.c:255 tomoyo_supervisor+0x290/0xd20 security/tomoyo/common.c:2095 tomoyo_audit_path_log security/tomoyo/file.c:168 [inline] tomoyo_path_permission security/tomoyo/file.c:587 [inline] tomoyo_path_permission+0x121/0x160 security/tomoyo/file.c:573 tomoyo_path_perm+0x23e/0x390 security/tomoyo/file.c:838 tomoyo_path_unlink+0x63/0x90 security/tomoyo/tomoyo.c:156 security_path_unlink+0xa3/0xd0 security/security.c:1044 do_unlinkat+0x2f1/0x530 fs/namei.c:4064 __do_sys_unlink fs/namei.c:4114 [inline] __se_sys_unlink fs/namei.c:4112 [inline] __x64_sys_unlink+0x3b/0x50 fs/namei.c:4112 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: 8001 Comm: syz-executor.0 Not tainted 5.5.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================