syzbot

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BUG: KCSAN: data-race in virtqueue_disable_cb / virtqueue_disable_cb

read to 0xffff88810267b188 of 2 bytes by interrupt on cpu 0:
 virtqueue_disable_cb_split drivers/virtio/virtio_ring.c:1046 [inline]
 virtqueue_disable_cb+0x4c/0x2c0 drivers/virtio/virtio_ring.c:3108
 skb_xmit_done+0x67/0x1a0 drivers/net/virtio_net.c:774
 vring_interrupt+0x2d7/0x310 drivers/virtio/virtio_ring.c:3254
 __handle_irq_event_percpu+0x8b/0x480 kernel/irq/handle.c:209
 handle_irq_event_percpu kernel/irq/handle.c:246 [inline]
 handle_irq_event+0x64/0xf0 kernel/irq/handle.c:263
 handle_edge_irq+0x154/0x450 kernel/irq/chip.c:856
 generic_handle_irq_desc include/linux/irqdesc.h:186 [inline]
 handle_irq arch/x86/kernel/irq.c:262 [inline]
 call_irq_handler arch/x86/kernel/irq.c:-1 [inline]
 __common_interrupt+0x60/0xb0 arch/x86/kernel/irq.c:333
 common_interrupt+0x3e/0x90 arch/x86/kernel/irq.c:326
 asm_common_interrupt+0x26/0x40 arch/x86/include/asm/idtentry.h:688
 selinux_sock security/selinux/include/objsec.h:254 [inline]
 selinux_socket_sock_rcv_skb+0x55/0x640 security/selinux/hooks.c:5416
 security_sock_rcv_skb+0x3c/0x70 security/security.c:4420
 sk_filter_trim_cap+0xca/0x580 net/core/filter.c:152
 tcp_filter include/net/tcp.h:1691 [inline]
 tcp_v4_rcv+0x1365/0x1b60 net/ipv4/tcp_ipv4.c:2225
 ip_protocol_deliver_rcu+0x395/0x790 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:480 [inline]
 ip_sublist_rcv_finish net/ipv4/ip_input.c:623 [inline]
 ip_list_rcv_finish net/ipv4/ip_input.c:675 [inline]
 ip_sublist_rcv+0x5a4/0x6a0 net/ipv4/ip_input.c:683
 ip_list_rcv+0x261/0x290 net/ipv4/ip_input.c:717
 __netif_receive_skb_list_ptype net/core/dev.c:6252 [inline]
 __netif_receive_skb_list_core+0x4dc/0x500 net/core/dev.c:6299
 __netif_receive_skb_list net/core/dev.c:6351 [inline]
 netif_receive_skb_list_internal+0x47d/0x5f0 net/core/dev.c:6442
 gro_normal_list include/net/gro.h:523 [inline]
 gro_flush_normal include/net/gro.h:531 [inline]
 napi_complete_done+0x19c/0x3f0 net/core/dev.c:6810
 virtqueue_napi_complete drivers/net/virtio_net.c:740 [inline]
 virtnet_poll+0x1b33/0x1fc0 drivers/net/virtio_net.c:3021
 __napi_poll+0x61/0x300 net/core/dev.c:7737
 napi_poll net/core/dev.c:7800 [inline]
 net_rx_action+0x452/0x930 net/core/dev.c:7957
 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+0x42/0xd0 kernel/softirq.c:735
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1061 [inline]
 sysvec_apic_timer_interrupt+0x74/0x80 arch/x86/kernel/apic/apic.c:1061
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
 preempt_schedule_irq+0x28/0x50 kernel/sched/core.c:7512
 raw_irqentry_exit_cond_resched+0x4b/0x60 kernel/entry/common.c:142
 irqentry_exit_to_kernel_mode_preempt+0x2b/0x40 include/linux/irq-entry-common.h:476
 irqentry_exit_to_kernel_mode include/linux/irq-entry-common.h:547 [inline]
 irqentry_exit+0x7d/0x5b0 kernel/entry/common.c:164
 asm_common_interrupt+0x26/0x40 arch/x86/include/asm/idtentry.h:688
 rcu_preempt_read_enter kernel/rcu/tree_plugin.h:391 [inline]
 __rcu_read_lock+0x36/0x50 kernel/rcu/tree_plugin.h:414
 rcu_read_lock include/linux/rcupdate.h:836 [inline]
 lock_task_sighand kernel/signal.c:1361 [inline]
 do_send_sig_info+0x25/0xf0 kernel/signal.c:1266
 send_sig_info kernel/signal.c:1619 [inline]
 send_sig_perf+0xdf/0x110 kernel/signal.c:1798
 perf_sigtrap kernel/events/core.c:7553 [inline]
 perf_pending_task+0x17c/0x210 kernel/events/core.c:7657
 task_work_run+0x130/0x1a0 kernel/task_work.c:233
 resume_user_mode_work+0x73/0x90 include/linux/resume_user_mode.h:50
 __exit_to_user_mode_loop kernel/entry/common.c:67 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:98 [inline]
 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline]
 irqentry_exit_to_user_mode_prepare include/linux/irq-entry-common.h:252 [inline]
 irqentry_exit_to_user_mode include/linux/irq-entry-common.h:323 [inline]
 irqentry_exit+0x151/0x5b0 kernel/entry/common.c:162
 sysvec_apic_timer_interrupt+0x44/0x80 arch/x86/kernel/apic/apic.c:1061
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697

write to 0xffff88810267b188 of 2 bytes by task 3303 on cpu 1:
 virtqueue_disable_cb_split drivers/virtio/virtio_ring.c:1047 [inline]
 virtqueue_disable_cb+0x75/0x2c0 drivers/virtio/virtio_ring.c:3108
 start_xmit+0x107/0x1a60 drivers/net/virtio_net.c:3344
 __netdev_start_xmit include/linux/netdevice.h:5343 [inline]
 netdev_start_xmit include/linux/netdevice.h:5352 [inline]
 xmit_one net/core/dev.c:3888 [inline]
 dev_hard_start_xmit+0x12a/0x3a0 net/core/dev.c:3904
 sch_direct_xmit+0x192/0x550 net/sched/sch_generic.c:372
 __dev_xmit_skb net/core/dev.c:4209 [inline]
 __dev_queue_xmit+0xdb9/0x1ec0 net/core/dev.c:4831
 dev_queue_xmit include/linux/netdevice.h:3401 [inline]
 neigh_hh_output include/net/neighbour.h:540 [inline]
 neigh_output include/net/neighbour.h:554 [inline]
 ip_finish_output2+0x705/0x8c0 net/ipv4/ip_output.c:237
 __ip_finish_output net/ipv4/ip_output.c:-1 [inline]
 ip_finish_output+0x112/0x290 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:470 [inline]
 ip_local_out net/ipv4/ip_output.c:131 [inline]
 __ip_queue_xmit+0xb68/0xba0 net/ipv4/ip_output.c:534
 ip_queue_xmit+0x39/0x50 net/ipv4/ip_output.c:548
 __tcp_transmit_skb+0x1c1c/0x20a0 net/ipv4/tcp_output.c:1713
 tcp_transmit_skb net/ipv4/tcp_output.c:1731 [inline]
 tcp_write_xmit+0x1211/0x3650 net/ipv4/tcp_output.c:3058
 tcp_push_one+0x7e/0xa0 net/ipv4/tcp_output.c:3255
 tcp_sendmsg_locked+0x1e21/0x2cc0 net/ipv4/tcp.c:1398
 tcp_sendmsg+0x2f/0x50 net/ipv4/tcp.c:1455
 inet_sendmsg+0x76/0xd0 net/ipv4/af_inet.c:866
 sock_sendmsg_nosec net/socket.c:787 [inline]
 __sock_sendmsg net/socket.c:802 [inline]
 sock_write_iter+0x2c7/0x320 net/socket.c:1254
 new_sync_write fs/read_write.c:595 [inline]
 vfs_write+0x5a6/0x9f0 fs/read_write.c:688
 ksys_write+0xdc/0x1a0 fs/read_write.c:740
 __do_sys_write fs/read_write.c:751 [inline]
 __se_sys_write fs/read_write.c:748 [inline]
 __x64_sys_write+0x40/0x50 fs/read_write.c:748
 x64_sys_call+0x27e1/0x3020 arch/x86/include/generated/asm/syscalls_64.h:2
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x12c/0x3b0 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: 1 UID: 0 PID: 3303 Comm: syz-executor Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026
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