linux-4.14.y boot error: WARNING in kvm_mmu_set_mmio_spte_mask

[syzbot]

Hello,

syzbot found the following crash on:

HEAD commit: c5c055bd Linux 4.14.185
git tree: linux-4.14.y
console output: https://syzkaller.appspot.com/x/log.txt?x=1170c711100000
kernel config: https://syzkaller.appspot.com/x/.config?x=3d47a997610d21a0
dashboard link: https://syzkaller.appspot.com/bug?extid=9632f48a65f138d6cc16
compiler: gcc (GCC) 9.0.0 20181231 (experimental)

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+9632f4...@syzkaller.appspotmail.com

RAPL PMU: hw unit of domain pp0-core 2^-0 Joules
RAPL PMU: hw unit of domain package 2^-0 Joules
RAPL PMU: hw unit of domain dram 2^-0 Joules
RAPL PMU: hw unit of domain pp1-gpu 2^-0 Joules
------------[ cut here ]------------
WARNING: CPU: 0 PID: 1 at arch/x86/kvm/mmu.c:279 kvm_mmu_set_mmio_spte_mask+0x76/0x80 arch/x86/kvm/mmu.c:279
Kernel panic - not syncing: panic_on_warn set ...

CPU: 0 PID: 1 Comm: swapper/0 Not tainted 4.14.185-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:17 [inline]
dump_stack+0x1b2/0x283 lib/dump_stack.c:58
panic+0x1f9/0x42d kernel/panic.c:183
__warn.cold+0x2f/0x30 kernel/panic.c:547
report_bug+0x20a/0x248 lib/bug.c:186
fixup_bug arch/x86/kernel/traps.c:177 [inline]
fixup_bug arch/x86/kernel/traps.c:172 [inline]
do_error_trap+0x195/0x2d0 arch/x86/kernel/traps.c:295
invalid_op+0x1b/0x40 arch/x86/entry/entry_64.S:964
RIP: 0010:kvm_mmu_set_mmio_spte_mask+0x76/0x80 arch/x86/kvm/mmu.c:279
RSP: 0000:ffff8880a9c5fd48 EFLAGS: 00010297
RAX: ffff8880a9c54040 RBX: 0008000000000001 RCX: 1ffffffff10e44b1
RDX: 0000000000000000 RSI: 0008000000000001 RDI: 0008000000000001
RBP: 0008000000000001 R08: 0000000000000001 R09: 0000000000000000
R10: ffff8880a9c548c8 R11: ffff8880a9c54040 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000006 R15: dffffc0000000000
kvm_set_mmio_spte_mask arch/x86/kvm/x86.c:6320 [inline]
kvm_arch_init+0x10b/0x260 arch/x86/kvm/x86.c:6400
kvm_init+0x66/0x510 arch/x86/kvm/../../../virt/kvm/kvm_main.c:4088
vmx_init+0x28/0x2aa arch/x86/kvm/vmx.c:12902
do_one_initcall+0x88/0x202 init/main.c:826
do_initcall_level init/main.c:892 [inline]
do_initcalls init/main.c:900 [inline]
do_basic_setup init/main.c:918 [inline]
kernel_init_freeable+0x558/0x619 init/main.c:1075
kernel_init+0xd/0x15b init/main.c:1000
ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404
Rebooting in 86400 seconds..


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[syzbot]

Auto-closing this bug as obsolete.
Crashes did not happen for a while, no reproducer and no activity.