================================================================== BUG: KCSAN: data-race in virtqueue_disable_cb / virtqueue_disable_cb write to 0xffff888102637988 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: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:857 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 __sanitizer_cov_trace_pc+0x8/0x70 kernel/kcov.c:213 shmem_mapping+0xd/0x30 mm/shmem.c:278 finish_fault+0x216/0xa00 mm/memory.c:5711 do_cow_fault mm/memory.c:5951 [inline] do_fault mm/memory.c:6045 [inline] do_pte_missing mm/memory.c:4566 [inline] handle_pte_fault mm/memory.c:6427 [inline] __handle_mm_fault mm/memory.c:6565 [inline] handle_mm_fault+0x211b/0x2e70 mm/memory.c:6734 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 read to 0xffff888102637988 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 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:544 [inline] neigh_output include/net/neighbour.h:558 [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_transmit_skb net/ipv4/tcp_output.c:1733 [inline] tcp_write_xmit+0x129e/0x36a0 net/ipv4/tcp_output.c:3061 __tcp_push_pending_frames+0x6d/0x1b0 net/ipv4/tcp_output.c:3244 tcp_push_pending_frames include/net/tcp.h:2360 [inline] tcp_data_snd_check net/ipv4/tcp_input.c:6075 [inline] tcp_rcv_established+0xda2/0x1320 net/ipv4/tcp_input.c:6558 tcp_v4_do_rcv+0x3c5/0xa40 net/ipv4/tcp_ipv4.c:1851 tcp_v4_rcv+0x18c9/0x1c10 net/ipv4/tcp_ipv4.c:2246 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:6245 [inline] __netif_receive_skb_list_core+0x4dc/0x500 net/core/dev.c:6292 __netif_receive_skb_list net/core/dev.c:6344 [inline] netif_receive_skb_list_internal+0x47d/0x5f0 net/core/dev.c:6435 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:6803 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:7733 napi_poll net/core/dev.c:7796 [inline] net_rx_action+0x452/0x930 net/core/dev.c:7953 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 common_interrupt+0x83/0x90 arch/x86/kernel/irq.c:326 asm_common_interrupt+0x26/0x40 arch/x86/include/asm/idtentry.h:688 check_kcov_mode kernel/kcov.c:183 [inline] write_comp_data kernel/kcov.c:246 [inline] __sanitizer_cov_trace_switch+0xb2/0x130 kernel/kcov.c:351 ma_pivots lib/maple_tree.c:574 [inline] mtree_range_walk lib/maple_tree.c:2028 [inline] mas_state_walk lib/maple_tree.c:2952 [inline] mt_find+0x2df/0xa10 lib/maple_tree.c:6271 find_vma+0x6c/0xa0 mm/mmap.c:908 gup_vma_lookup mm/gup.c:1275 [inline] __get_user_pages+0x240/0x1f10 mm/gup.c:1396 __get_user_pages_locked mm/gup.c:1692 [inline] get_dump_page+0xb4/0x240 mm/gup.c:2192 dump_user_range+0x142/0xd00 fs/coredump.c:1372 elf_core_dump+0x21a2/0x2330 fs/binfmt_elf.c:2109 coredump_write+0xacc/0xdd0 fs/coredump.c:1053 do_coredump fs/coredump.c:1132 [inline] vfs_coredump+0x26dd/0x31e0 fs/coredump.c:1206 get_signal+0xd5c/0xf20 kernel/signal.c:3022 arch_do_signal_or_restart+0x96/0x480 arch/x86/kernel/signal.c:337 __exit_to_user_mode_loop kernel/entry/common.c:64 [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:244 [inline] irqentry_exit_to_user_mode include/linux/irq-entry-common.h:315 [inline] irqentry_exit+0x145/0x5d0 kernel/entry/common.c:162 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:618 value changed: 0x0000 -> 0x0001 Reported by Kernel Concurrency Sanitizer on: CPU: 0 UID: 0 PID: 11395 Comm: syz.3.2014 Tainted: G W syzkaller #0 PREEMPT(full) Tainted: [W]=WARN Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026 ==================================================================