syzbot

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BUG: KCSAN: data-race in virtqueue_disable_cb / virtqueue_disable_cb

write to 0xffff888101f2d478 of 2 bytes by interrupt on cpu 1:
 virtqueue_disable_cb_split drivers/virtio/virtio_ring.c:874 [inline]
 virtqueue_disable_cb+0x85/0x180 drivers/virtio/virtio_ring.c:2566
 skb_xmit_done+0x5f/0x140 drivers/net/virtio_net.c:777
 vring_interrupt+0x161/0x190 drivers/virtio/virtio_ring.c:2715
 __handle_irq_event_percpu+0x95/0x490 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+0x16d/0x5b0 kernel/irq/chip.c:831
 generic_handle_irq_desc include/linux/irqdesc.h:173 [inline]
 handle_irq arch/x86/kernel/irq.c:249 [inline]
 call_irq_handler arch/x86/kernel/irq.c:261 [inline]
 __common_interrupt+0x58/0xe0 arch/x86/kernel/irq.c:287
 common_interrupt+0x7c/0x90 arch/x86/kernel/irq.c:280
 asm_common_interrupt+0x26/0x40 arch/x86/include/asm/idtentry.h:693
 preempt_model_preemptible include/linux/preempt.h:528 [inline]
 spin_needbreak include/linux/spinlock.h:465 [inline]
 copy_pte_range mm/memory.c:1140 [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+0x8ea/0x3940 mm/memory.c:1420
 dup_mmap kernel/fork.c:748 [inline]
 dup_mm kernel/fork.c:1700 [inline]
 copy_mm+0xa9e/0x12d0 kernel/fork.c:1752
 copy_process+0xd06/0x1f50 kernel/fork.c:2403
 kernel_clone+0x167/0x5e0 kernel/fork.c:2815
 __do_sys_clone kernel/fork.c:2958 [inline]
 __se_sys_clone kernel/fork.c:2942 [inline]
 __x64_sys_clone+0xe7/0x120 kernel/fork.c:2942
 x64_sys_call+0x2d7e/0x2dc0 arch/x86/include/generated/asm/syscalls_64.h:57
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xc9/0x1c0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffff888101f2d478 of 2 bytes by task 3286 on cpu 0:
 virtqueue_disable_cb_split drivers/virtio/virtio_ring.c:873 [inline]
 virtqueue_disable_cb+0x63/0x180 drivers/virtio/virtio_ring.c:2566
 start_xmit+0x15c/0x1310 drivers/net/virtio_net.c:3259
 __netdev_start_xmit include/linux/netdevice.h:5151 [inline]
 netdev_start_xmit include/linux/netdevice.h:5160 [inline]
 xmit_one net/core/dev.c:3800 [inline]
 dev_hard_start_xmit+0x119/0x3f0 net/core/dev.c:3816
 sch_direct_xmit+0x1a9/0x580 net/sched/sch_generic.c:343
 __dev_xmit_skb net/core/dev.c:4042 [inline]
 __dev_queue_xmit+0xf6a/0x2090 net/core/dev.c:4618
 dev_queue_xmit include/linux/netdevice.h:3313 [inline]
 neigh_hh_output include/net/neighbour.h:523 [inline]
 neigh_output include/net/neighbour.h:537 [inline]
 ip_finish_output2+0x71d/0x880 net/ipv4/ip_output.c:236
 ip_finish_output+0x11a/0x2a0 net/ipv4/ip_output.c:324
 NF_HOOK_COND include/linux/netfilter.h:303 [inline]
 ip_output+0xab/0x170 net/ipv4/ip_output.c:434
 dst_output include/net/dst.h:459 [inline]
 ip_local_out net/ipv4/ip_output.c:130 [inline]
 __ip_queue_xmit+0xb2c/0xb50 net/ipv4/ip_output.c:528
 ip_queue_xmit+0x38/0x50 net/ipv4/ip_output.c:542
 __tcp_transmit_skb+0x15ca/0x19d0 net/ipv4/tcp_output.c:1471
 tcp_transmit_skb net/ipv4/tcp_output.c:1489 [inline]
 tcp_write_xmit+0x1217/0x3020 net/ipv4/tcp_output.c:2832
 __tcp_push_pending_frames+0x6a/0x1a0 net/ipv4/tcp_output.c:3015
 tcp_push+0x320/0x340 net/ipv4/tcp.c:751
 tcp_sendmsg_locked+0x21a1/0x26a0 net/ipv4/tcp.c:1326
 tcp_sendmsg+0x30/0x50 net/ipv4/tcp.c:1358
 inet_sendmsg+0x77/0xd0 net/ipv4/af_inet.c:851
 sock_sendmsg_nosec net/socket.c:718 [inline]
 __sock_sendmsg+0x102/0x180 net/socket.c:733
 sock_write_iter+0x15e/0x1a0 net/socket.c:1137
 new_sync_write fs/read_write.c:586 [inline]
 vfs_write+0x77b/0x920 fs/read_write.c:679
 ksys_write+0xe8/0x1b0 fs/read_write.c:731
 __do_sys_write fs/read_write.c:742 [inline]
 __se_sys_write fs/read_write.c:739 [inline]
 __x64_sys_write+0x42/0x50 fs/read_write.c:739
 x64_sys_call+0x287e/0x2dc0 arch/x86/include/generated/asm/syscalls_64.h:2
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xc9/0x1c0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x0000 -> 0x0001

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 3286 Comm: syz-executor Not tainted 6.14.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
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