------------[ cut here ]------------
WARNING: CPU: 0 PID: 6869 at drivers/gpu/drm/drm_modeset_lock.c:92 drm_modeset_lock_all+0x1fc/0x2d0 drivers/gpu/drm/drm_modeset_lock.c:92
Kernel panic - not syncing: panic_on_warn set ...

CPU: 0 PID: 6869 Comm: syz-executor6 Not tainted 4.13.0-rc4-next-20170811 #2
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 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:930
RIP: 0010:drm_modeset_lock_all+0x1fc/0x2d0 drivers/gpu/drm/drm_modeset_lock.c:92
RSP: 0018:ffff880036f5fad8 EFLAGS: 00010216
RAX: 0000000000010000 RBX: ffff880036f5fcb0 RCX: ffffc900044ad000
RDX: 000000000000c64e RSI: ffffffff82896dac RDI: ffffffff85cb9660
RBP: ffff880036f5faf0 R08: 0000000000000000 R09: 1ffff10006debea0
R10: ffff880036f5f4c8 R11: ffffffff85b34bc0 R12: 0000000000000000
R13: ffff88003ca6e240 R14: ffff880039ba2000 R15: ffff880036f5fbc8
 drm_mode_obj_get_properties_ioctl+0x87/0x2b0 drivers/gpu/drm/drm_mode_object.c:359
 drm_ioctl_kernel+0x1e7/0x2e0 drivers/gpu/drm/drm_ioctl.c:729
 drm_ioctl+0x72e/0xa50 drivers/gpu/drm/drm_ioctl.c:825
 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: 0033:0x446739
RSP: 002b:00007f2fc562fc08 EFLAGS: 00000282 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 0000000000446739
RDX: 0000000020d9b000 RSI: 00000000000001b9 RDI: 0000000000000005
RBP: 00007f2fc562fa00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000282 R12: 00000000004a8096
R13: 0000000000000000 R14: 00007f2fc562f9c8 R15: 00007f2fc562fb38
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..