syzbot

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BUG: KCSAN: data-race in virtqueue_disable_cb / virtqueue_enable_cb_delayed

write to 0xffff88810387a7ca of 1 bytes by task 1807 on cpu 0:
 virtqueue_enable_cb_delayed+0x3e/0x3a0 drivers/virtio/virtio_ring.c:2099
 start_xmit+0xf1/0xaf0 drivers/net/virtio_net.c:1789
 __netdev_start_xmit include/linux/netdevice.h:4805 [inline]
 netdev_start_xmit include/linux/netdevice.h:4819 [inline]
 xmit_one+0xc0/0x2a0 net/core/dev.c:3588
 dev_hard_start_xmit+0x72/0x120 net/core/dev.c:3604
 sch_direct_xmit+0x1ac/0x580 net/sched/sch_generic.c:342
 __dev_xmit_skb+0x800/0xdb0 net/core/dev.c:3815
 __dev_queue_xmit+0x59f/0xfe0 net/core/dev.c:4219
 dev_queue_xmit include/linux/netdevice.h:2994 [inline]
 neigh_hh_output include/net/neighbour.h:533 [inline]
 neigh_output include/net/neighbour.h:547 [inline]
 ip_finish_output2+0x70b/0x850 net/ipv4/ip_output.c:228
 ip_finish_output+0xf3/0x250 net/ipv4/ip_output.c:316
 NF_HOOK_COND include/linux/netfilter.h:296 [inline]
 ip_output+0xf3/0x1a0 net/ipv4/ip_output.c:430
 dst_output include/net/dst.h:451 [inline]
 ip_local_out net/ipv4/ip_output.c:126 [inline]
 __ip_queue_xmit+0xa2e/0xa50 net/ipv4/ip_output.c:532
 ip_queue_xmit+0x34/0x40 net/ipv4/ip_output.c:546
 __tcp_transmit_skb+0x12a4/0x1790 net/ipv4/tcp_output.c:1405
 __tcp_send_ack+0x1dc/0x2e0 net/ipv4/tcp_output.c:3973
 tcp_send_ack+0x23/0x30 net/ipv4/tcp_output.c:3979
 tcp_cleanup_rbuf+0x1c7/0x310 net/ipv4/tcp.c:1588
 tcp_recvmsg_locked+0xfe5/0x1440 net/ipv4/tcp.c:2524
 tcp_recvmsg+0x148/0x4c0 net/ipv4/tcp.c:2554
 inet_recvmsg+0x9e/0x210 net/ipv4/af_inet.c:850
 sock_recvmsg_nosec net/socket.c:995 [inline]
 sock_recvmsg net/socket.c:1013 [inline]
 sock_read_iter+0x19d/0x1e0 net/socket.c:1086
 call_read_iter include/linux/fs.h:2054 [inline]
 new_sync_read fs/read_write.c:401 [inline]
 vfs_read+0x5a5/0x6a0 fs/read_write.c:482
 ksys_read+0xe8/0x1a0 fs/read_write.c:620
 __do_sys_read fs/read_write.c:630 [inline]
 __se_sys_read fs/read_write.c:628 [inline]
 __x64_sys_read+0x3e/0x50 fs/read_write.c:628
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x46/0xb0

read to 0xffff88810387a7ca of 1 bytes by interrupt on cpu 1:
 virtqueue_disable_cb+0x17/0x160 drivers/virtio/virtio_ring.c:2006
 virtqueue_napi_schedule drivers/net/virtio_net.c:355 [inline]
 skb_xmit_done+0xa5/0x110 drivers/net/virtio_net.c:383
 vring_interrupt+0x143/0x1c0 drivers/virtio/virtio_ring.c:2149
 __handle_irq_event_percpu+0x92/0x400 kernel/irq/handle.c:158
 handle_irq_event_percpu kernel/irq/handle.c:193 [inline]
 handle_irq_event+0x60/0xf0 kernel/irq/handle.c:210
 handle_edge_irq+0x17e/0x5a0 kernel/irq/chip.c:817
 generic_handle_irq_desc include/linux/irqdesc.h:158 [inline]
 handle_irq arch/x86/kernel/irq.c:231 [inline]
 __common_interrupt+0x60/0x100 arch/x86/kernel/irq.c:250
 common_interrupt+0x9a/0xc0 arch/x86/kernel/irq.c:240
 asm_common_interrupt+0x27/0x40
 __raw_callee_save___pv_queued_spin_unlock+0xc/0x12
 pv_queued_spin_unlock arch/x86/include/asm/paravirt.h:596 [inline]
 queued_spin_unlock arch/x86/include/asm/qspinlock.h:57 [inline]
 do_raw_spin_unlock include/linux/spinlock.h:202 [inline]
 __raw_spin_unlock_bh include/linux/spinlock_api_smp.h:166 [inline]
 _raw_spin_unlock_bh+0x22/0x40 kernel/locking/spinlock.c:210
 spin_unlock_bh include/linux/spinlock.h:394 [inline]
 batadv_nc_purge_paths+0x26f/0x2c0 net/batman-adv/network-coding.c:471
 batadv_nc_worker+0x45b/0xc00 net/batman-adv/network-coding.c:722
 process_one_work+0x3d3/0x720 kernel/workqueue.c:2289
 worker_thread+0x618/0xa70 kernel/workqueue.c:2436
 kthread+0x1a9/0x1e0 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30

value changed: 0x01 -> 0x00

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 36 Comm: kworker/u4:2 Not tainted 5.18.0-syzkaller-13760-g032dcf09e2bf-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: bat_events batadv_nc_worker
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