syzbot

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BUG: KCSAN: data-race in kvm_cpu_has_injectable_intr / kvm_pic_set_irq

write to 0xffff888092a4b158 of 4 bytes by task 19995 on cpu 1:
 pic_irq_request arch/x86/kvm/i8259.c:567 [inline]
 pic_update_irq arch/x86/kvm/i8259.c:176 [inline]
 kvm_pic_set_irq+0x62c/0x8a0 arch/x86/kvm/i8259.c:196
 kvm_set_pic_irq+0x44/0x50 arch/x86/kvm/irq_comm.c:35
 kvm_set_irq+0x1cd/0x340 arch/x86/kvm/../../../virt/kvm/irqchip.c:89
 pit_do_work+0x90/0x180 arch/x86/kvm/i8254.c:250
 kthread_worker_fn+0x283/0x3b0 kernel/kthread.c:707
 kthread+0x20d/0x230 kernel/kthread.c:291
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:293

read to 0xffff888092a4b158 of 4 bytes by task 20007 on cpu 0:
 kvm_cpu_has_extint arch/x86/kvm/irq.c:51 [inline]
 kvm_cpu_has_injectable_intr+0xbc/0x1c0 arch/x86/kvm/irq.c:78
 inject_pending_event+0x9cd/0xd10 arch/x86/kvm/x86.c:7878
 vcpu_enter_guest+0x416/0x2760 arch/x86/kvm/x86.c:8438
 vcpu_run+0x27e/0x790 arch/x86/kvm/x86.c:8659
 kvm_arch_vcpu_ioctl_run+0x38d/0x6a0 arch/x86/kvm/x86.c:8880
 kvm_vcpu_ioctl+0x565/0x950 arch/x86/kvm/../../../virt/kvm/kvm_main.c:3166
 vfs_ioctl fs/ioctl.c:48 [inline]
 ksys_ioctl fs/ioctl.c:753 [inline]
 __do_sys_ioctl fs/ioctl.c:762 [inline]
 __se_sys_ioctl+0xc9/0x130 fs/ioctl.c:760
 __x64_sys_ioctl+0x3f/0x50 fs/ioctl.c:760
 do_syscall_64+0x51/0xb0 arch/x86/entry/common.c:359
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 20007 Comm: syz-executor.3 Not tainted 5.8.0-rc3-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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