linux-kernel - 4.5 regression - [drm/vmwgfx] BUG: unable to handle kernel NULL pointer dereference at (null)

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Date:	Tue, 16 Feb 2016 02:42:29 +0000 (GMT)
From:	Jongman Heo <jongman.heo@...sung.com>
To:	linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org,
	daniel.vetter@...ll.ch, syeh@...are.com, thellstrom@...are.com,
	airlied@...ux.ie
Subject: 4.5 regression - [drm/vmwgfx] BUG: unable to handle kernel NULL
 pointer dereference at (null)


Hi all,

With Linux 4.5-rc4, I still have a problem what I had reported, on VMWare workstation 10 (Linux guest, Windows 7 host);

   [drm/vmwgfx] BUG: unable to handle kernel NULL pointer dereference at (null) 
   http://linux-kernel.2935.n7.nabble.com/drm-vmwgfx-BUG-unable-to-handle-kernel-NULL-pointer-dereference-at-null-td1283153.html

First bad commit was d56f57ac "drm/gma500: Move to private save/restore hooks." 

[   74.569484] BUG: unable to handle kernel NULL pointer dereference at   (null)
[   74.569490] IP: [<  (null)>]   (null)
[   74.569493] *pde = 00000000 
[   74.569495] Oops: 0010 [#1] SMP 
[   74.569498] Modules linked in:
[   74.569502] CPU: 5 PID: 900 Comm: gnome-shell Not tainted 4.5.0-rc4+ #216
[   74.569505] Hardware name: VMware, Inc. VMware Virtual Platform/440BX Desktop Reference Platform, BIOS 6.00 07/31/2013
[   74.569507] task: f677d580 ti: efad0000 task.ti: efad0000
[   74.569509] EIP: 0060:[<00000000>] EFLAGS: 00210246 CPU: 5
[   74.569511] EIP is at 0x0
[   74.569513] EAX: f6e08358 EBX: f6d90000 ECX: 00002000 EDX: 00002000
[   74.569514] ESI: f6e0836c EDI: c0d2bac0 EBP: efad1dbc ESP: efad1d34
[   74.569516]  DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068
[   74.569518] CR0: 80050033 CR2: 00000000 CR3: 2f97b000 CR4: 001406d0
[   74.569581] Stack:
[   74.569583]  c09619ed ffff0a00 efad1d64 c0841138 ffffff04 00000001 ffff0a00 f6d9012c
[   74.569588]  ffffffff efa38e00 c0f4abd8 f0e930bc efad1e04 00000000 00000000 00000000
[   74.569591]  00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[   74.569595] Call Trace:
[   74.569601]  [<c09619ed>] ? drm_mode_getconnector+0x28d/0x320
[   74.569605]  [<c0841138>] ? string+0x78/0x90
[   74.569608]  [<c0961760>] ? drm_mode_getcrtc+0x140/0x140
[   74.569611]  [<c0953819>] drm_ioctl+0x149/0x4f0
[   74.569613]  [<c0961760>] ? drm_mode_getcrtc+0x140/0x140
[   74.569617]  [<c05064a7>] ? prepare_reply+0x17/0xc0
[   74.569620]  [<c04d21ed>] ? futex_wake+0x7d/0x180
[   74.569625]  [<c0981f7e>] vmw_unlocked_ioctl+0x16e/0x270
[   74.569627]  [<c04d42b2>] ? do_futex+0x102/0x930
[   74.569629]  [<c04c64a7>] ? timekeeping_inject_offset+0x2b7/0x2c0
[   74.569632]  [<c0981e10>] ? vmw_pm_suspend+0x50/0x50
[   74.569635]  [<c05babec>] do_vfs_ioctl+0x8c/0x730
[   74.569639]  [<c05753ea>] ? handle_mm_fault+0x99a/0x1440
[   74.569642]  [<c04d4b73>] ? SyS_futex+0x93/0x160
[   74.569645]  [<c05bb2f8>] SyS_ioctl+0x68/0x80
[   74.569647]  [<c04c64a7>] ? timekeeping_inject_offset+0x2b7/0x2c0
[   74.569649]  [<c0401c4d>] do_fast_syscall_32+0x8d/0x150
[   74.569651]  [<c04c64a7>] ? timekeeping_inject_offset+0x2b7/0x2c0
[   74.569653]  [<c04c64a7>] ? timekeeping_inject_offset+0x2b7/0x2c0
[   74.569655]  [<c04c64a7>] ? timekeeping_inject_offset+0x2b7/0x2c0
[   74.569658]  [<c0c850d8>] sysenter_past_esp+0x3d/0x5d
[   74.569660]  [<c04c64a7>] ? timekeeping_inject_offset+0x2b7/0x2c0
[   74.569662]  [<c04c64a7>] ? timekeeping_inject_offset+0x2b7/0x2c0
[   74.569663] Code:  Bad EIP value.
[   74.569667] EIP: [<00000000>] 0x0 SS:ESP 0068:efad1d34
[   74.569669] CR2: 0000000000000000
[   74.569729] ---[ end trace c16827c10f10024e ]---

Thanks,
Jongman.