================================================================== BUG: KCSAN: data-race in virtqueue_disable_cb / virtqueue_disable_cb read to 0xffff88810160d888 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+0x7e/0x90 arch/x86/kernel/irq.c:326 asm_common_interrupt+0x26/0x40 arch/x86/include/asm/idtentry.h:688 __preempt_count_dec_and_test arch/x86/include/asm/preempt.h:95 [inline] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:179 [inline] _raw_spin_unlock_irqrestore+0x1a/0x30 kernel/locking/spinlock.c:198 spin_unlock_irqrestore include/linux/spinlock.h:408 [inline] pcpu_alloc_noprof+0x762/0xfd0 mm/percpu.c:1864 qdisc_alloc+0x27f/0x410 net/sched/sch_generic.c:991 qdisc_create_dflt+0x7f/0x2b0 net/sched/sch_generic.c:1031 mq_init_common+0x1b4/0x290 net/sched/sch_mq.c:91 mq_init+0x35/0x150 net/sched/sch_mq.c:112 qdisc_create_dflt+0xef/0x2b0 net/sched/sch_generic.c:1038 attach_default_qdiscs net/sched/sch_generic.c:1220 [inline] dev_activate+0xde/0x9e0 net/sched/sch_generic.c:1274 __dev_open+0x4bd/0x560 net/core/dev.c:1711 __dev_change_flags+0x1c8/0x490 net/core/dev.c:9755 netif_change_flags+0x5a/0xd0 net/core/dev.c:9818 dev_change_flags+0xce/0x190 net/core/dev_api.c:68 dev_ifsioc+0x441/0xfd0 net/core/dev_ioctl.c:555 dev_ioctl+0x709/0x960 net/core/dev_ioctl.c:816 sock_do_ioctl+0x1aa/0x230 net/socket.c:1327 sock_ioctl+0x41b/0x610 net/socket.c:1434 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:597 [inline] __se_sys_ioctl+0xce/0x140 fs/ioctl.c:583 __x64_sys_ioctl+0x43/0x50 fs/ioctl.c:583 x64_sys_call+0x1563/0x3020 arch/x86/include/generated/asm/syscalls_64.h:17 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 write to 0xffff88810160d888 of 2 bytes by task 3232 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:5368 [inline] netdev_start_xmit include/linux/netdevice.h:5377 [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:3418 [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+0x1c2a/0x20b0 net/ipv4/tcp_output.c:1715 __tcp_send_ack+0x288/0x3b0 net/ipv4/tcp_output.c:4499 tcp_send_ack+0x29/0x30 net/ipv4/tcp_output.c:4505 __tcp_cleanup_rbuf+0x15a/0x290 net/ipv4/tcp.c:1603 tcp_cleanup_rbuf net/ipv4/tcp.c:1615 [inline] tcp_recvmsg_locked+0x1c41/0x2160 net/ipv4/tcp.c:2919 tcp_recvmsg+0x12a/0x460 net/ipv4/tcp.c:2948 inet_recvmsg+0x8d/0x210 net/ipv4/af_inet.c:896 sock_recvmsg_nosec net/socket.c:1137 [inline] sock_recvmsg+0xda/0x120 net/socket.c:1159 sock_read_iter+0x169/0x1b0 net/socket.c:1229 new_sync_read fs/read_write.c:493 [inline] vfs_read+0x6c0/0x7f0 fs/read_write.c:574 ksys_read+0xdc/0x1a0 fs/read_write.c:717 __do_sys_read fs/read_write.c:726 [inline] __se_sys_read fs/read_write.c:724 [inline] __x64_sys_read+0x40/0x50 fs/read_write.c:724 x64_sys_call+0x2886/0x3020 arch/x86/include/generated/asm/syscalls_64.h:1 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: 3232 Comm: syz-executor Tainted: G W syzkaller #0 PREEMPT(full) Tainted: [W]=WARN Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026 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