kvm: emulating exchange as write
BUG: kernel NULL pointer dereference, address: 0000000000000086
#PF: supervisor instruction fetch in kernel mode
#PF: error_code(0x0010) - not-present page
PGD 9e713067 P4D 9e713067 PUD 9e44a067 PMD 0 
Oops: 0010 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 9490 Comm: syz-executor.1 Not tainted 5.6.0-rc7-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:0x86
Code: Bad RIP value.
RSP: 0018:ffffc900018e7998 EFLAGS: 00010086
RAX: ffffc900018e79c8 RBX: fffffe0000000000 RCX: 0000000000040000
RDX: ffffc90004479000 RSI: 000000000001f8db RDI: 000000000001f8dc
RBP: 0000000000000ec0 R08: ffffffff8398c3c3 R09: ffffffff811c7eca
R10: ffff888048a86100 R11: 0000000000000002 R12: dffffc0000000000
R13: fffffe0000000ec8 R14: ffffffff880016f0 R15: fffffe0000000ecb
FS:  00007f1ad7e11700(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000000000005c CR3: 000000009dd2f000 CR4: 00000000001426e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 handle_external_interrupt_irqoff+0x154/0x280 arch/x86/kvm/vmx/vmx.c:6274
 kvm_before_interrupt arch/x86/kvm/x86.h:343 [inline]
 handle_external_interrupt_irqoff+0x132/0x280 arch/x86/kvm/vmx/vmx.c:6272
 __irqentry_text_start+0x8/0x8
 vcpu_enter_guest+0x6c77/0x9290 arch/x86/kvm/x86.c:8405
 set_bit include/asm-generic/bitops/instrumented-atomic.h:28 [inline]
 kvm_make_request include/linux/kvm_host.h:1222 [inline]
 kvm_arch_vcpu_load+0x53e/0x810 arch/x86/kvm/x86.c:3564
 __fire_sched_in_preempt_notifiers kernel/sched/core.c:3025 [inline]
 fire_sched_in_preempt_notifiers kernel/sched/core.c:3031 [inline]
 finish_task_switch+0x2e2/0x550 kernel/sched/core.c:3223
 __lock_acquire+0xc5a/0x1bc0 kernel/locking/lockdep.c:3954
 retint_kernel+0x2b/0x2b
 lock_acquire+0x154/0x250 kernel/locking/lockdep.c:4484
 rcu_lock_acquire+0x9/0x30 include/linux/rcupdate.h:208
 kvm_check_async_pf_completion+0x34e/0x360 arch/x86/kvm/../../../virt/kvm/async_pf.c:137
 vcpu_run+0x3a3/0xd50 arch/x86/kvm/x86.c:8513
 kvm_arch_vcpu_ioctl_run+0x419/0x880 arch/x86/kvm/x86.c:8735
 kvm_vcpu_ioctl+0x67c/0xa80 arch/x86/kvm/../../../virt/kvm/kvm_main.c:2932
 kvm_vm_release+0x50/0x50 arch/x86/kvm/../../../virt/kvm/kvm_main.c:858
 vfs_ioctl fs/ioctl.c:47 [inline]
 ksys_ioctl fs/ioctl.c:763 [inline]
 __do_sys_ioctl fs/ioctl.c:772 [inline]
 __se_sys_ioctl+0xf9/0x160 fs/ioctl.c:770
 do_syscall_64+0xf3/0x1b0 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
Modules linked in:
CR2: 0000000000000086
---[ end trace e93f610742cfed00 ]---
RIP: 0010:0x86
Code: Bad RIP value.
RSP: 0018:ffffc900018e7998 EFLAGS: 00010086
RAX: ffffc900018e79c8 RBX: fffffe0000000000 RCX: 0000000000040000
RDX: ffffc90004479000 RSI: 000000000001f8db RDI: 000000000001f8dc
RBP: 0000000000000ec0 R08: ffffffff8398c3c3 R09: ffffffff811c7eca
R10: ffff888048a86100 R11: 0000000000000002 R12: dffffc0000000000
R13: fffffe0000000ec8 R14: ffffffff880016f0 R15: fffffe0000000ecb
FS:  00007f1ad7e11700(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000000000005c CR3: 000000009dd2f000 CR4: 00000000001426e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400