On Sun, Mar 06, 2016 at 07:50:14PM -0700, Erik Andersen wrote: > The following patch to radeon_sa_bo_new that > went into 3.10.99 > > commit 8d5e1e5af0c667545c202e8f4051f77aa3bf31b7 > Author: Nicolai Hähnle <nicolai.haehnle@xxxxxxx> > 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] Next time, please cc: the people responsible for that patch as well... I can revert it, but maybe something else is going on here? Do you have this same problem on 3.14, and 4.5-rc7? thanks, greg k-h -- To unsubscribe from this list: send the line "unsubscribe stable" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html