================================================================== BUG: KCSAN: data-race in virtqueue_disable_cb / virtqueue_disable_cb read to 0xffff8881026d2a88 of 2 bytes by task 3297 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 start_xmit+0x102/0x17c0 drivers/net/virtio_net.c:3331 __netdev_start_xmit include/linux/netdevice.h:5275 [inline] netdev_start_xmit include/linux/netdevice.h:5284 [inline] xmit_one net/core/dev.c:3871 [inline] dev_hard_start_xmit+0x136/0x3f0 net/core/dev.c:3887 sch_direct_xmit+0x192/0x550 net/sched/sch_generic.c:347 __dev_xmit_skb net/core/dev.c:4186 [inline] __dev_queue_xmit+0xca9/0x1f20 net/core/dev.c:4802 dev_queue_xmit include/linux/netdevice.h:3384 [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+0x114/0x2a0 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+0xbb0/0xbf0 net/ipv4/ip_output.c:534 ip_queue_xmit+0x39/0x50 net/ipv4/ip_output.c:548 __tcp_transmit_skb+0x1af2/0x1f10 net/ipv4/tcp_output.c:1693 __tcp_send_ack+0x288/0x3b0 net/ipv4/tcp_output.c:4503 tcp_send_ack+0x29/0x30 net/ipv4/tcp_output.c:4509 __tcp_cleanup_rbuf+0x15a/0x290 net/ipv4/tcp.c:1613 tcp_cleanup_rbuf net/ipv4/tcp.c:1625 [inline] tcp_recvmsg_locked+0x2025/0x2230 net/ipv4/tcp.c:2949 tcp_recvmsg+0x12c/0x460 net/ipv4/tcp.c:2979 inet_recvmsg+0xb7/0x290 net/ipv4/af_inet.c:891 sock_recvmsg_nosec net/socket.c:1078 [inline] sock_recvmsg+0xf6/0x160 net/socket.c:1100 sock_read_iter+0x169/0x1b0 net/socket.c:1170 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/0x370 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f write to 0xffff8881026d2a88 of 2 bytes by interrupt 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 skb_xmit_done+0x67/0x1a0 drivers/net/virtio_net.c:783 vring_interrupt+0x2d7/0x310 drivers/virtio/virtio_ring.c:3254 __handle_irq_event_percpu+0x9c/0x4d0 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+0x154/0x470 kernel/irq/chip.c:855 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 arch_atomic_read arch/x86/include/asm/atomic.h:23 [inline] raw_atomic_read include/linux/atomic/atomic-arch-fallback.h:457 [inline] atomic_read include/linux/atomic/atomic-instrumented.h:33 [inline] page_ref_count include/linux/page_ref.h:67 [inline] page_expected_state mm/page_alloc.c:1077 [inline] free_page_is_bad+0x16/0x80 mm/page_alloc.c:1116 __free_pages_prepare mm/page_alloc.c:1407 [inline] __free_frozen_pages+0x3b2/0x530 mm/page_alloc.c:2978 __folio_put+0x11e/0x150 mm/swap.c:112 folio_put include/linux/mm.h:1817 [inline] put_page include/linux/mm.h:1886 [inline] put_netmem include/net/netmem.h:420 [inline] skb_page_unref include/linux/skbuff_ref.h:43 [inline] __skb_frag_unref include/linux/skbuff_ref.h:56 [inline] skb_release_data+0x3fb/0x670 net/core/skbuff.c:1122 skb_release_all net/core/skbuff.c:1203 [inline] napi_consume_skb+0x179/0x340 net/core/skbuff.c:1550 skb_defer_free_flush net/core/dev.c:6823 [inline] net_rx_action+0x2a2/0x930 net/core/dev.c:7891 handle_softirqs+0xb9/0x2a0 kernel/softirq.c:622 __do_softirq kernel/softirq.c:656 [inline] invoke_softirq kernel/softirq.c:496 [inline] __irq_exit_rcu+0x39/0xc0 kernel/softirq.c:723 common_interrupt+0x83/0x90 arch/x86/kernel/irq.c:326 asm_common_interrupt+0x26/0x40 arch/x86/include/asm/idtentry.h:688 __rcu_read_lock+0x42/0x50 kernel/rcu/tree_plugin.h:420 rcu_read_lock include/linux/rcupdate.h:848 [inline] count_memcg_events_mm include/linux/memcontrol.h:983 [inline] count_memcg_event_mm include/linux/memcontrol.h:993 [inline] mm_account_fault mm/memory.c:6488 [inline] handle_mm_fault+0x2596/0x3020 mm/memory.c:6649 do_user_addr_fault+0x62f/0x1050 arch/x86/mm/fault.c:1334 handle_page_fault arch/x86/mm/fault.c:1474 [inline] exc_page_fault+0x62/0xa0 arch/x86/mm/fault.c:1527 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:618 value changed: 0x0000 -> 0x0001 Reported by Kernel Concurrency Sanitizer on: CPU: 1 UID: 0 PID: 19297 Comm: dhcpcd-run-hook Tainted: G W syzkaller #0 PREEMPT(full) Tainted: [W]=WARN Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026 ==================================================================