linux-kernel - Oops in 3.10.99 -- NULL pointer dereference in radeon_fence

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Date:	Sun, 6 Mar 2016 19:50:14 -0700
From:	Erik Andersen <andersen@...epoet.org>
To:	linux-kernel <linux-kernel@...r.kernel.org>
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: Oops in 3.10.99 -- NULL pointer dereference in radeon_fence_ref

The following patch to radeon_sa_bo_new that
went into 3.10.99

  commit 8d5e1e5af0c667545c202e8f4051f77aa3bf31b7
  Author: Nicolai HÃ¤hnle <nicolai.haehnle@....com>
  Date:   Fri Feb 5 14:35:53 2016 -0500
    drm/radeon: hold reference to fences in radeon_sa_bo_new
    commit f6ff4f67cdf8455d0a4226eeeaf5af17c37d05eb upstream.

is triggering an Oops for me right when xscreensaver
first began doing 3D stuff.  After reverting this
patch, xscreensaver has been happily running 3D stuff.

Mar  6 18:00:43 sage kernel: BUG: unable to handle kernel NULL pointer dereference at 0000000000000008
Mar  6 18:00:43 sage kernel: IP: [<ffffffffa010345d>] radeon_fence_ref+0xd/0x50 [radeon]
Mar  6 18:00:43 sage kernel: PGD 799e1d067 PUD 819186067 PMD 0
Mar  6 18:00:43 sage kernel: Oops: 0002 [#1] SMP

Mar  6 18:00:43 sage kernel: Stack:
Mar  6 18:00:43 sage kernel:  ffffffffa01607ec ffff88108a4e8000 ffff88108a4e8000 ffff880888fbc000
Mar  6 18:00:43 sage kernel:  ffff880ecbf11c78 0000fe2001000006 0000000000000000 0020000000000100
Mar  6 18:00:43 sage kernel:  00000000000d1200 ffff880ecbf11c14 0000000000000000 0000000000000000
Mar  6 18:00:43 sage kernel: Call Trace:
Mar  6 18:00:43 sage kernel:  [<ffffffffa01607ec>] ? radeon_sa_bo_new+0x2ac/0x4f0 [radeon]
Mar  6 18:00:43 sage kernel:  [<ffffffffa005fc9d>] ? ttm_eu_list_ref_sub+0x3d/0x60 [ttm]
Mar  6 18:00:43 sage kernel:  [<ffffffffa0117c49>] radeon_ib_get+0x39/0x110 [radeon]
Mar  6 18:00:43 sage kernel:  [<ffffffffa011a4ea>] radeon_cs_ioctl+0x69a/0xa70 [radeon]
Mar  6 18:00:43 sage kernel:  [<ffffffffa008e2d2>] drm_ioctl+0x512/0x650 [drm]
Mar  6 18:00:43 sage kernel:  [<ffffffff810a46e1>] ? do_futex+0x111/0xc30
Mar  6 18:00:43 sage kernel:  [<ffffffff81182a45>] do_vfs_ioctl+0x305/0x520
Mar  6 18:00:43 sage kernel:  [<ffffffff8107cd39>] ? vtime_account_user+0x69/0x80
Mar  6 18:00:43 sage kernel:  [<ffffffff81182ce1>] SyS_ioctl+0x81/0xa0
Mar  6 18:00:43 sage kernel:  [<ffffffff8178210f>] tracesys+0xe1/0xe6

$ lspci | grep VGA
03:00.0 VGA compatible controller: Advanced Micro Devices, Inc.
[AMD/ATI] Redwood XT [Radeon HD 5670/5690/5730]

 -Erik

--
Erik B. Andersen
--This message was written using 73% post-consumer electrons--