syzbot

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BUG: KCSAN: data-race in virtqueue_disable_cb / virtqueue_disable_cb

read to 0xffff888102950578 of 2 bytes by interrupt on cpu 0:
 virtqueue_disable_cb_split drivers/virtio/virtio_ring.c:885 [inline]
 virtqueue_disable_cb+0x63/0x180 drivers/virtio/virtio_ring.c:2446
 skb_xmit_done+0x5f/0x130 drivers/net/virtio_net.c:483
 vring_interrupt+0x150/0x170 drivers/virtio/virtio_ring.c:2595
 __handle_irq_event_percpu+0x91/0x490 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+0x167/0x590 kernel/irq/chip.c:831
 generic_handle_irq_desc include/linux/irqdesc.h:161 [inline]
 handle_irq arch/x86/kernel/irq.c:238 [inline]
 __common_interrupt+0x54/0xe0 arch/x86/kernel/irq.c:257
 common_interrupt+0x7a/0x90 arch/x86/kernel/irq.c:247
 asm_common_interrupt+0x26/0x40 arch/x86/include/asm/idtentry.h:640
 kcsan_setup_watchpoint+0x3fe/0x410 kernel/kcsan/core.c:705
 batadv_nc_purge_orig_hash net/batman-adv/network-coding.c:406 [inline]
 batadv_nc_worker+0x80/0xac0 net/batman-adv/network-coding.c:719
 process_one_work kernel/workqueue.c:2633 [inline]
 process_scheduled_works+0x5b8/0xa30 kernel/workqueue.c:2706
 worker_thread+0x525/0x730 kernel/workqueue.c:2787
 kthread+0x1d7/0x210 kernel/kthread.c:388
 ret_from_fork+0x48/0x60 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:242

write to 0xffff888102950578 of 2 bytes by task 3050 on cpu 1:
 virtqueue_disable_cb_split drivers/virtio/virtio_ring.c:886 [inline]
 virtqueue_disable_cb+0x85/0x180 drivers/virtio/virtio_ring.c:2446
 start_xmit+0xf0/0xa90 drivers/net/virtio_net.c:2399
 __netdev_start_xmit include/linux/netdevice.h:4989 [inline]
 netdev_start_xmit include/linux/netdevice.h:5003 [inline]
 xmit_one net/core/dev.c:3547 [inline]
 dev_hard_start_xmit+0x115/0x3f0 net/core/dev.c:3563
 sch_direct_xmit+0x1b0/0x580 net/sched/sch_generic.c:342
 __dev_xmit_skb net/core/dev.c:3776 [inline]
 __dev_queue_xmit+0xe68/0x1da0 net/core/dev.c:4317
 dev_queue_xmit include/linux/netdevice.h:3171 [inline]
 neigh_hh_output include/net/neighbour.h:526 [inline]
 neigh_output include/net/neighbour.h:540 [inline]
 ip_finish_output2+0x726/0x870 net/ipv4/ip_output.c:235
 ip_finish_output+0xf4/0x240 net/ipv4/ip_output.c:323
 NF_HOOK_COND include/linux/netfilter.h:303 [inline]
 ip_output+0xab/0x170 net/ipv4/ip_output.c:433
 dst_output include/net/dst.h:451 [inline]
 ip_local_out net/ipv4/ip_output.c:129 [inline]
 __ip_queue_xmit+0xb40/0xb60 net/ipv4/ip_output.c:535
 ip_queue_xmit+0x38/0x40 net/ipv4/ip_output.c:549
 __tcp_transmit_skb+0x11d9/0x1890 net/ipv4/tcp_output.c:1462
 tcp_transmit_skb net/ipv4/tcp_output.c:1480 [inline]
 tcp_write_xmit+0x12d7/0x2fd0 net/ipv4/tcp_output.c:2792
 __tcp_push_pending_frames+0x6a/0x1a0 net/ipv4/tcp_output.c:2977
 tcp_push+0x320/0x330 net/ipv4/tcp.c:737
 tcp_sendmsg_locked+0x21a4/0x2680 net/ipv4/tcp.c:1309
 tcp_sendmsg+0x30/0x50 net/ipv4/tcp.c:1341
 inet_sendmsg+0x63/0x80 net/ipv4/af_inet.c:850
 sock_sendmsg_nosec net/socket.c:730 [inline]
 __sock_sendmsg net/socket.c:745 [inline]
 sock_write_iter+0x1aa/0x230 net/socket.c:1160
 call_write_iter include/linux/fs.h:2085 [inline]
 new_sync_write fs/read_write.c:497 [inline]
 vfs_write+0x760/0x8d0 fs/read_write.c:590
 ksys_write+0xeb/0x1a0 fs/read_write.c:643
 __do_sys_write fs/read_write.c:655 [inline]
 __se_sys_write fs/read_write.c:652 [inline]
 __x64_sys_write+0x42/0x50 fs/read_write.c:652
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0x59/0x120 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x63/0x6b

value changed: 0x0000 -> 0x0001

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 3050 Comm: sshd Not tainted 6.8.0-rc1-syzkaller-00331-gcd2286fc5775 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023
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