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<base href="https://bugs.freedesktop.org/" />
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - WARN_ON(!(old->frontbuffer_bits & frontbuffer_bits))"
href="https://bugs.freedesktop.org/show_bug.cgi?id=91866">91866</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>WARN_ON(!(old->frontbuffer_bits & frontbuffer_bits))
</td>
</tr>
<tr>
<th>Product</th>
<td>DRI
</td>
</tr>
<tr>
<th>Version</th>
<td>XOrg git
</td>
</tr>
<tr>
<th>Hardware</th>
<td>Other
</td>
</tr>
<tr>
<th>OS</th>
<td>All
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>medium
</td>
</tr>
<tr>
<th>Component</th>
<td>DRM/Intel
</td>
</tr>
<tr>
<th>Assignee</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>chithanh@gentoo.org
</td>
</tr>
<tr>
<th>QA Contact</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr>
<tr>
<th>CC</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=118069" name="attach_118069" title="dmesg">attachment 118069</a> <a href="attachment.cgi?id=118069&action=edit" title="dmesg">[details]</a></span>
dmesg
Hardware: Lenovo T440s (Haswell)
Since linux-4.2 I am seeing the following oops, which is similar but not
identical to the one in <a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED WORKSFORME - [ivb/bsw regression] WARN_ON(obj->frontbuffer_bits)"
href="show_bug.cgi?id=87259">bug 87259</a>:
[ 431.068176] ------------[ cut here ]------------
[ 431.068187] WARNING: CPU: 1 PID: 3868 at
drivers/gpu/drm/i915/i915_gem.c:5269 i915_gem_track_fb+0x69/0x107()
[ 431.068189] WARN_ON(!(old->frontbuffer_bits & frontbuffer_bits))
[ 431.068190] Modules linked in:
[ 431.068192] rtsx_pci_sdmmc mmc_core iwlmvm mac80211 x86_pkg_temp_thermal
intel_powerclamp crct10dif_pclmul crc32_pclmul iwlwifi cfg80211 rtsx_pci mei_me
mei btusb btrtl btbcm btintel efivarfs
[ 431.068207] CPU: 1 PID: 3868 Comm: X Tainted: G W 4.2.0-gentoo
#2
[ 431.068208] Hardware name: LENOVO 20ARS0BH00/20ARS0BH00, BIOS GJET84WW (2.34
) 06/22/2015
[ 431.068210] 0000000000000009 ffff88030b253a78 ffffffff818526a1
0000000080000000
[ 431.068213] ffff88030b253ac8 ffff88030b253ab8 ffffffff810a45b5
ffff8800d5cb2880
[ 431.068216] ffffffff814a4465 ffff8800d5cb2880 ffff88030e408000
0000000000000010
[ 431.068218] Call Trace:
[ 431.068223] [<ffffffff818526a1>] dump_stack+0x4f/0x7b
[ 431.068228] [<ffffffff810a45b5>] warn_slowpath_common+0x9c/0xb6
[ 431.068231] [<ffffffff814a4465>] ? i915_gem_track_fb+0x69/0x107
[ 431.068234] [<ffffffff810a4610>] warn_slowpath_fmt+0x41/0x43
[ 431.068237] [<ffffffff814a4465>] i915_gem_track_fb+0x69/0x107
[ 431.068243] [<ffffffff814db854>] intel_prepare_plane_fb+0x125/0x146
[ 431.068247] [<ffffffff8145bc73>] drm_atomic_helper_prepare_planes+0x53/0xb4
[ 431.068250] [<ffffffff814d507f>] __intel_set_mode+0x308/0x8fb
[ 431.068254] [<ffffffff814db436>] intel_crtc_set_config+0x3fb/0x4bf
[ 431.068259] [<ffffffff8146d2a5>] drm_mode_set_config_internal+0x54/0xe0
[ 431.068261] [<ffffffff81470e4a>] drm_mode_setcrtc+0x39f/0x419
[ 431.068264] [<ffffffff81464a6a>] drm_ioctl+0x37f/0x3f7
[ 431.068266] [<ffffffff81470aab>] ? drm_mode_setplane+0x164/0x164
[ 431.068271] [<ffffffff8119fa52>] do_vfs_ioctl+0x367/0x421
[ 431.068275] [<ffffffff8133498e>] ? selinux_file_ioctl+0xa1/0xa3
[ 431.068279] [<ffffffff8132fcac>] ? security_file_ioctl+0x30/0x44
[ 431.068281] [<ffffffff8119fb5a>] SyS_ioctl+0x4e/0x7c
[ 431.068287] [<ffffffff81859d5b>] entry_SYSCALL_64_fastpath+0x16/0x6e
[ 431.068289] ---[ end trace e0452e0963bbfe78 ]---
In this kernel I had reverted d2944cf21305c754fa8b2d6c1eea05ad5dad7944 as per
<a class="bz_bug_link
bz_status_REOPENED "
title="REOPENED - [drm:check_crtc_state] *ERROR* mismatch in ips_enabled (expected 1, found 0)"
href="show_bug.cgi?id=91511#c3">bug 91511 comment 3</a>, but the oops happens regardless of this patch being
reverted or not.</pre>
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