suspicious RCU usage at arch/x86/kvm/x86.c:LINE (2)

Kernel	Title	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
upstream	suspicious RCU usage at arch/x86/kvm/x86.c:LINE				1	2731d	2724d	0/28	closed as invalid on 2017/08/15 05:48

=============================
WARNING: suspicious RCU usage
4.13.0-rc6+ #55 Not tainted
-----------------------------
------------[ cut here ]------------
WARNING: CPU: 1 PID: 7736 at arch/x86/kvm/x86.c:7235 kvm_arch_vcpu_ioctl_run+0x213/0x5870 arch/x86/kvm/x86.c:7235
Kernel panic - not syncing: panic_on_warn set ...

CPU: 1 PID: 7736 Comm: syz-executor6 Not tainted 4.13.0-rc6+ #55
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:16 [inline]
 dump_stack+0x194/0x257 lib/dump_stack.c:52
 panic+0x1e4/0x417 kernel/panic.c:180
 __warn+0x1c4/0x1d9 kernel/panic.c:541
 report_bug+0x211/0x2d0 lib/bug.c:183
 fixup_bug+0x40/0x90 arch/x86/kernel/traps.c:190
 do_trap_no_signal arch/x86/kernel/traps.c:224 [inline]
 do_trap+0x260/0x390 arch/x86/kernel/traps.c:273
 do_error_trap+0x120/0x390 arch/x86/kernel/traps.c:310
 do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:323
 invalid_op+0x1e/0x30 arch/x86/entry/entry_64.S:846
RIP: 0010:kvm_arch_vcpu_ioctl_run+0x213/0x5870 arch/x86/kvm/x86.c:7235
RSP: 0018:ffff8801d3b57670 EFLAGS: 00010216
RAX: 0000000000010000 RBX: ffff8801c996c000 RCX: ffffc90004b0a000
RDX: 0000000000000096 RSI: ffffffff810e19b3 RDI: ffff8801c12c0720
RBP: ffff8801d3b57a40 R08: 0000000000000001 R09: ffffed003a76af2c
R10: ffff8801d3b57a58 R11: 0000000000000000 R12: 0000000000000001
R13: 0000000000000000 R14: ffff8801c283be40 R15: ffff8801c12c0500
 kvm_vcpu_ioctl+0x64c/0x1010 arch/x86/kvm/../../../virt/kvm/kvm_main.c:2589
 vfs_ioctl fs/ioctl.c:45 [inline]
 do_vfs_ioctl+0x1b1/0x1520 fs/ioctl.c:685
 SYSC_ioctl fs/ioctl.c:700 [inline]
 SyS_ioctl+0x8f/0xc0 fs/ioctl.c:691
 entry_SYSCALL_64_fastpath+0x1f/0xbe
RIP: 0033:0x4512e9
RSP: 002b:00007fb5c4291c08 EFLAGS: 00000216 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000718150 RCX: 00000000004512e9
RDX: 0000000000000000 RSI: 000000000000ae80 RDI: 0000000000000017
RBP: 0000000000000086 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000216 R12: 00000000004b70fc
R13: 00000000ffffffff R14: 0000000020024000 R15: 0000000000001000
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..

Time	Kernel	Commit	Syzkaller	Config	Log	Report	Manager
2017/08/28 09:35	upstream	0cc3b0ec23ce	4074aed7	.config	console log	report	ci-upstream-kasan-gce
2017/09/21 05:47	mmots	720bbe532b7c	c26ea367	.config	console log	report	ci-upstream-mmots-kasan-gce
2017/09/07 00:47	linux-next	e9fcbcd00963	0ed1da4a	.config	console log	report	skylake-linux-next-kasan-qemu
2017/09/06 03:15	mmots	c97efd59aceb	0ed1da4a	.config	console log	report	ci-upstream-mmots-kasan-gce