------------[ cut here ]------------
WARNING: CPU: 1 PID: 7523 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: 1 PID: 7523 Comm: syz-executor2 Not tainted 4.13.0-rc7-next-20170901+ #13
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:181
 __warn+0x1c4/0x1d9 kernel/panic.c:542
 report_bug+0x211/0x2d0 lib/bug.c:183
 fixup_bug+0x40/0x90 arch/x86/kernel/traps.c:178
 do_trap_no_signal arch/x86/kernel/traps.c:212 [inline]
 do_trap+0x260/0x390 arch/x86/kernel/traps.c:261
 do_error_trap+0x120/0x390 arch/x86/kernel/traps.c:298
 do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:311
 invalid_op+0x18/0x20 arch/x86/entry/entry_64.S:905
RIP: 0010:drm_modeset_lock_all+0x1fc/0x2d0 drivers/gpu/drm/drm_modeset_lock.c:92
RSP: 0018:ffff880050567ad8 EFLAGS: 00010212
RAX: 0000000000010000 RBX: ffff880050567cb0 RCX: ffffc90001957000
RDX: 000000000000c044 RSI: ffffffff828b29dc RDI: 0000000000000282
RBP: ffff880050567af0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: ffff88006a830000 R14: ffff88003726b240 R15: ffff880050567bc8
 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:735
 drm_ioctl+0x72e/0xa50 drivers/gpu/drm/drm_ioctl.c:831
 vfs_ioctl fs/ioctl.c:45 [inline]
 do_vfs_ioctl+0x1b1/0x1530 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: 0033:0x447299
RSP: 002b:00007fd754481c08 EFLAGS: 00000296 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 0000000000447299
RDX: 00000000202f0000 RSI: 00000002000007b9 RDI: 0000000000000005
RBP: 0000000000000082 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000296 R12: 00000000004a8bf7
R13: 0000000000000000 R14: 00007fd7544819c8 R15: 00007fd754481b38
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..