3.16-rc2 reboot warning!

[Wang Shilong]

I hit this warning in Linux 3.16rc2 booting, Not sure if this has been 
fixed, hope it help!
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[    1.770683] [drm] DMA map mode: Using physical TTM page addresses.
[    1.770788] [drm] Capabilities:
[    1.770800] [drm]   Rect copy.
[    1.770802] [drm]   Cursor.
[    1.770804] [drm]   Cursor bypass.
[    1.770806] [drm]   Cursor bypass 2.
[    1.770809] [drm]   8bit emulation.
[    1.770811] [drm]   Alpha cursor.
[    1.770814] [drm]   Extended Fifo.
[    1.770817] [drm]   Multimon.
[    1.770819] [drm]   Pitchlock.
[    1.770821] [drm]   Irq mask.
[    1.770823] [drm]   Display Topology.
[    1.770825] [drm]   GMR.
[    1.770827] [drm]   Traces.
[    1.770830] [drm]   GMR2.
[    1.770833] [drm]   Screen Object 2.
[    1.770836] [drm] Max GMR ids is 64
[    1.770838] [drm] Max number of GMR pages is 65536
[    1.770840] [drm] Max dedicated hypervisor surface memory is 163840 kiB
[    1.770843] [drm] Maximum display memory size is 8192 kiB
[    1.770845] [drm] VRAM at 0xd8000000 size is 8192 kiB
[    1.770847] [drm] MMIO at 0xd0800000 size is 256 kiB
[    1.770900] [drm] global init.
[    1.771159] [TTM] Zone  kernel: Available graphics memory: 3942698 kiB
[    1.771163] [TTM] Zone   dma32: Available graphics memory: 2097152 kiB
[    1.771166] [TTM] Initializing pool allocator
[    1.771193] [TTM] Initializing DMA pool allocator
[    1.771660] [drm] Supports vblank timestamp caching Rev 2 (21.10.2013).
[    1.771664] [drm] No driver support for vblank timestamp query.
[    1.772220] ------------[ cut here ]------------
[    1.772249] WARNING: CPU: 0 PID: 160 at drivers/gpu/drm/drm_modeset_lock.c:91 drm_modeset_drop_locks+0x71/0x80 [drm]()
[    1.772252] Modules linked in: vmwgfx(+) sd_mod drm_kms_helper crc_t10dif crct10dif_common ttm drm ata_piix libata vmw_pvscsi i2c_core floppy
[    1.772280] CPU: 0 PID: 160 Comm: systemd-udevd Not tainted 3.16.0-rc2+ #1
[    1.772283] Hardware name: VMware, Inc. VMware Virtual Platform/440BX Desktop Reference Platform, BIOS 6.00 08/16/2013
[    1.772286]  0000000000000000 00000000e25ff18d ffff880036a2b938 ffffffff8160f1af
[    1.772295]  0000000000000000 ffff880036a2b970 ffffffff8105a44d ffff8800366fdb00
[    1.772304]  ffff880232942000 ffff8800366fdb00 ffff88022f521800 ffff880036580000
[    1.772313] Call Trace:
[    1.772322]  [<ffffffff8160f1af>] dump_stack+0x4d/0x66
[    1.772329]  [<ffffffff8105a44d>] warn_slowpath_common+0x7d/0xa0
[    1.772334]  [<ffffffff8105a57a>] warn_slowpath_null+0x1a/0x20
[    1.772344]  [<ffffffffa0098941>] drm_modeset_drop_locks+0x71/0x80 [drm]
[    1.772354]  [<ffffffffa00896be>] drm_modeset_unlock_all+0x2e/0x70 [drm]
[    1.772365]  [<ffffffffa008b287>] drm_crtc_init_with_planes+0xa7/0x110 [drm]
[    1.772372]  [<ffffffffa00d4373>] drm_crtc_init+0x33/0xcc0 [drm_kms_helper]
[    1.772382]  [<ffffffffa0178a51>] vmw_kms_init_screen_object_display+0x1a1/0x260 [vmwgfx]
[    1.772390]  [<ffffffffa016b759>] vmw_kms_init+0x59/0x70 [vmwgfx]
[    1.772399]  [<ffffffffa016d88f>] vmw_driver_load+0x80f/0xd60 [vmwgfx]
[    1.772408]  [<ffffffffa008416d>] drm_dev_register+0xad/0x100 [drm]
[    1.772418]  [<ffffffffa0086e1f>] drm_get_pci_dev+0x8f/0x1f0 [drm]
[    1.772427]  [<ffffffffa016c6e5>] vmw_probe+0x15/0x20 [vmwgfx]
[    1.772434]  [<ffffffff81346c05>] local_pci_probe+0x45/0xa0
[    1.772442]  [<ffffffff81347db5>] ? pci_match_device+0xe5/0x110
[    1.772449]  [<ffffffff81347f19>] pci_device_probe+0xf9/0x150
[    1.772460]  [<ffffffff81405ab0>] driver_probe_device+0x90/0x3c0
[    1.772466]  [<ffffffff81405eb3>] __driver_attach+0x93/0xa0
[    1.772471]  [<ffffffff81405e20>] ? __device_attach+0x40/0x40
[    1.772476]  [<ffffffff81403903>] bus_for_each_dev+0x73/0xc0
[    1.772481]  [<ffffffff8140551e>] driver_attach+0x1e/0x20
[    1.772486]  [<ffffffff814050f8>] bus_add_driver+0x188/0x260
[    1.772491]  [<ffffffff81406994>] driver_register+0x64/0xf0
[    1.772496]  [<ffffffff81346590>] __pci_register_driver+0x60/0x70
[    1.772506]  [<ffffffffa008708a>] drm_pci_init+0x10a/0x140 [drm]
[    1.772512]  [<ffffffff810bc07d>] ? trace_hardirqs_on+0xd/0x10
[    1.772517]  [<ffffffffa0193000>] ? 0xffffffffa0192fff
[    1.772525]  [<ffffffffa0193018>] vmwgfx_init+0x18/0x1000 [vmwgfx]
[    1.772533]  [<ffffffff81000314>] do_one_initcall+0xd4/0x210
[    1.772540]  [<ffffffff811bb72c>] ? __vunmap+0xac/0x110
[    1.772548]  [<ffffffff810f741c>] load_module+0x13ec/0x1af0
[    1.772553]  [<ffffffff810f2630>] ? store_uevent+0x70/0x70
[    1.772558]  [<ffffffff810f3002>] ? copy_module_from_fd.isra.47+0x122/0x180
[    1.772564]  [<ffffffff810f7ce6>] SyS_finit_module+0xa6/0xd0
[    1.772570]  [<ffffffff81619512>] system_call_fastpath+0x16/0x1b
[    1.772573] ---[ end trace 45128a916e166aef ]---
[    1.773051] [drm] Screen objects system initialized
[    1.773309] [drm] width 1280
[    1.773329] [drm] height 768
[    1.773339] [drm] bpp 32
[    1.783940] [drm] Fifo max 0x00040000 min 0x00001000 cap 0x0000077f
[    1.790916] fbcon: svgadrmfb (fb0) is primary device
[    1.793255] Console: switching to colour frame buffer device 160x48
[    1.794982] [drm] Initialized vmwgfx 2.6.0 20140325 for 0000:00:0f.0 on minor 0