IPv4: Oversized IP packet from 172.20.20.10 ================================================================== BUG: KCSAN: data-race in virtqueue_disable_cb / virtqueue_disable_cb read to 0xffff8881020ef478 of 2 bytes by interrupt on cpu 1: virtqueue_disable_cb_split drivers/virtio/virtio_ring.c:873 [inline] virtqueue_disable_cb+0x58/0x150 drivers/virtio/virtio_ring.c:2570 skb_xmit_done+0x65/0x140 drivers/net/virtio_net.c:784 vring_interrupt+0x152/0x180 drivers/virtio/virtio_ring.c:2719 __handle_irq_event_percpu+0x90/0x440 kernel/irq/handle.c:158 handle_irq_event_percpu kernel/irq/handle.c:193 [inline] handle_irq_event+0x64/0xf0 kernel/irq/handle.c:210 handle_edge_irq+0x154/0x470 kernel/irq/chip.c:855 generic_handle_irq_desc include/linux/irqdesc.h:173 [inline] handle_irq arch/x86/kernel/irq.c:254 [inline] call_irq_handler arch/x86/kernel/irq.c:266 [inline] __common_interrupt+0x63/0x100 arch/x86/kernel/irq.c:292 common_interrupt+0x7e/0x90 arch/x86/kernel/irq.c:285 asm_common_interrupt+0x26/0x40 arch/x86/include/asm/idtentry.h:693 vm_normal_page mm/memory.c:604 [inline] copy_present_ptes mm/memory.c:992 [inline] copy_pte_range mm/memory.c:1174 [inline] copy_pmd_range mm/memory.c:1261 [inline] copy_pud_range mm/memory.c:1298 [inline] copy_p4d_range mm/memory.c:1322 [inline] copy_page_range+0xc0e/0x3c20 mm/memory.c:1410 dup_mmap+0x885/0xf20 mm/mmap.c:1834 dup_mm kernel/fork.c:1485 [inline] copy_mm+0x11a/0x370 kernel/fork.c:1537 copy_process+0xd08/0x2000 kernel/fork.c:2175 kernel_clone+0x16c/0x5c0 kernel/fork.c:2605 __do_sys_clone kernel/fork.c:2748 [inline] __se_sys_clone kernel/fork.c:2732 [inline] __x64_sys_clone+0xe6/0x120 kernel/fork.c:2732 x64_sys_call+0x119c/0x2ff0 arch/x86/include/generated/asm/syscalls_64.h:57 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xd2/0x200 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f write to 0xffff8881020ef478 of 2 bytes by interrupt on cpu 0: virtqueue_disable_cb_split drivers/virtio/virtio_ring.c:874 [inline] virtqueue_disable_cb+0x7a/0x150 drivers/virtio/virtio_ring.c:2570 start_xmit+0x103/0x17a0 drivers/net/virtio_net.c:3362 __netdev_start_xmit include/linux/netdevice.h:5219 [inline] netdev_start_xmit include/linux/netdevice.h:5228 [inline] xmit_one net/core/dev.c:3827 [inline] dev_hard_start_xmit+0x122/0x3e0 net/core/dev.c:3843 sch_direct_xmit+0x192/0x550 net/sched/sch_generic.c:344 __dev_xmit_skb net/core/dev.c:4102 [inline] __dev_queue_xmit+0xe9a/0x2000 net/core/dev.c:4679 dev_queue_xmit include/linux/netdevice.h:3358 [inline] neigh_hh_output include/net/neighbour.h:531 [inline] neigh_output include/net/neighbour.h:545 [inline] ip_finish_output2+0x77f/0x8b0 net/ipv4/ip_output.c:235 __ip_finish_output net/ipv4/ip_output.c:-1 [inline] ip_finish_output+0x114/0x2a0 net/ipv4/ip_output.c:323 NF_HOOK_COND include/linux/netfilter.h:307 [inline] ip_output+0xbd/0x190 net/ipv4/ip_output.c:436 dst_output include/net/dst.h:461 [inline] ip_local_out net/ipv4/ip_output.c:129 [inline] __ip_queue_xmit+0xb4b/0xb80 net/ipv4/ip_output.c:532 ip_queue_xmit+0x39/0x50 net/ipv4/ip_output.c:546 __tcp_transmit_skb+0x1641/0x1a60 net/ipv4/tcp_output.c:1479 tcp_transmit_skb net/ipv4/tcp_output.c:1497 [inline] tcp_write_xmit+0x1210/0x2fd0 net/ipv4/tcp_output.c:2833 __tcp_push_pending_frames+0x6d/0x1b0 net/ipv4/tcp_output.c:3016 tcp_push_pending_frames include/net/tcp.h:2173 [inline] tcp_data_snd_check net/ipv4/tcp_input.c:5666 [inline] tcp_rcv_established+0xa7f/0xf50 net/ipv4/tcp_input.c:6218 tcp_v4_do_rcv+0x672/0x740 net/ipv4/tcp_ipv4.c:1926 tcp_v4_rcv+0x1bd5/0x1f70 net/ipv4/tcp_ipv4.c:2368 ip_protocol_deliver_rcu+0x397/0x780 net/ipv4/ip_input.c:205 ip_local_deliver_finish+0x1fc/0x2f0 net/ipv4/ip_input.c:239 NF_HOOK include/linux/netfilter.h:318 [inline] ip_local_deliver+0xe8/0x1c0 net/ipv4/ip_input.c:260 dst_input include/net/dst.h:471 [inline] ip_sublist_rcv_finish net/ipv4/ip_input.c:585 [inline] ip_list_rcv_finish net/ipv4/ip_input.c:634 [inline] ip_sublist_rcv+0x58e/0x670 net/ipv4/ip_input.c:642 ip_list_rcv+0x261/0x290 net/ipv4/ip_input.c:676 __netif_receive_skb_list_ptype net/core/dev.c:6022 [inline] __netif_receive_skb_list_core+0x4dc/0x500 net/core/dev.c:6069 __netif_receive_skb_list net/core/dev.c:6121 [inline] netif_receive_skb_list_internal+0x487/0x600 net/core/dev.c:6212 gro_normal_list include/net/gro.h:532 [inline] gro_flush_normal include/net/gro.h:540 [inline] napi_complete_done+0x1a3/0x410 net/core/dev.c:6581 virtqueue_napi_complete drivers/net/virtio_net.c:766 [inline] virtnet_poll+0x1843/0x1cb0 drivers/net/virtio_net.c:3118 __napi_poll+0x66/0x310 net/core/dev.c:7489 napi_poll net/core/dev.c:7552 [inline] net_rx_action+0x391/0x830 net/core/dev.c:7679 handle_softirqs+0xb7/0x290 kernel/softirq.c:579 __do_softirq kernel/softirq.c:613 [inline] invoke_softirq kernel/softirq.c:453 [inline] __irq_exit_rcu+0x3a/0xc0 kernel/softirq.c:680 common_interrupt+0x83/0x90 arch/x86/kernel/irq.c:285 asm_common_interrupt+0x26/0x40 arch/x86/include/asm/idtentry.h:693 kcsan_setup_watchpoint+0x415/0x430 kernel/kcsan/core.c:705 check_access kernel/kcsan/core.c:753 [inline] __tsan_memset+0x1da/0x1f0 kernel/kcsan/core.c:1335 iov_iter_init lib/iov_iter.c:167 [inline] __import_iovec+0x2e1/0x540 lib/iov_iter.c:1489 import_iovec+0x61/0x80 lib/iov_iter.c:1523 copy_msghdr_from_user net/socket.c:2551 [inline] recvmsg_copy_msghdr net/socket.c:2800 [inline] ___sys_recvmsg+0x358/0x370 net/socket.c:2872 do_recvmmsg+0x1ef/0x540 net/socket.c:2971 __sys_recvmmsg net/socket.c:3045 [inline] __do_sys_recvmmsg net/socket.c:3068 [inline] __se_sys_recvmmsg net/socket.c:3061 [inline] __x64_sys_recvmmsg+0xe5/0x170 net/socket.c:3061 x64_sys_call+0x27a6/0x2ff0 arch/x86/include/generated/asm/syscalls_64.h:300 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xd2/0x200 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: 0 UID: 0 PID: 19898 Comm: syz.6.5476 Not tainted 6.16.0-syzkaller-12245-g2988dfed8a5d #0 PREEMPT(voluntary) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025 ==================================================================