BUG: KCSAN: data-race in vring_interrupt+

[jim . cromie]

I got this on rc7 + myhacks
Im testing on virtme ( kvm + qemu + 9p )

lemme know if I can test something.

[   18.081278] virtme-init: starting udevd
Starting version v248.3-1.fc34
[   18.763364] virtme-init: triggering udev coldplug
[   18.893238] ==================================================================
[   18.894240] BUG: KCSAN: data-race in vring_interrupt+0xf7/0x130
[   18.895108]
[   18.895334] race at unknown origin, with read to 0xffff888005ca5942
of 2 bytes by interrupt on cpu 0:
[   18.896791]  vring_interrupt+0xf7/0x130
[   18.897389]  __handle_irq_event_percpu+0x64/0x260
[   18.898218]  handle_irq_event+0x93/0x120
[   18.898883]  handle_edge_irq+0x123/0x400
[   18.899550]  __common_interrupt+0x3e/0xa0
[   18.900204]  common_interrupt+0x7e/0xa0
[   18.900844]  asm_common_interrupt+0x1e/0x40
[   18.901625]  native_safe_halt+0xe/0x10
[   18.902180]  default_idle+0xa/0x10
[   18.902808]  default_idle_call+0x38/0xc0
[   18.903439]  do_idle+0x1e7/0x270
[   18.903972]  cpu_startup_entry+0x19/0x20
[   18.904717]  rest_init+0xd0/0xd2
[   18.905443]  arch_call_rest_init+0xa/0x11
[   18.906125]  start_kernel+0xacb/0xadd
[   18.906681]  secondary_startup_64_no_verify+0xc2/0xcb
[   18.907392]
[   18.907624] Reported by Kernel Concurrency Sanitizer on:
[   18.908440] CPU: 0 PID: 0 Comm: swapper/0 Not tainted
5.13.0-rc7-dd7i-00038-g4e27591489f1-dirty #124
[   18.910025] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996),
BIOS 1.14.0-3.fc34 04/01/2014
[   18.911392] ==================================================================