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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 - [BAT ILK] list_add corruption in test drv_module_reload_basic"
href="https://bugs.freedesktop.org/show_bug.cgi?id=94870">94870</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>[BAT ILK] list_add corruption in test drv_module_reload_basic
</td>
</tr>
<tr>
<th>Product</th>
<td>DRI
</td>
</tr>
<tr>
<th>Version</th>
<td>DRI git
</td>
</tr>
<tr>
<th>Hardware</th>
<td>x86-64 (AMD64)
</td>
</tr>
<tr>
<th>OS</th>
<td>Linux (All)
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>highest
</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>tim.gore@intel.com
</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>
<tr>
<th>i915 platform</th>
<td>ILK
</td>
</tr></table>
<p>
<div>
<pre>During BAT testing of a patch targeting gen9 only, igt test
drv_module_reload_basic causes "list_add corruption" warning in dmesg log on
the ilk-hp8440p target, although the test reports success.
Patch being tested is <a href="https://patchwork.freedesktop.org/series/5367/">https://patchwork.freedesktop.org/series/5367/</a>
This introduces a workaround in gen9_init_workarounds, which is also
conditional on
(IS_SKL_REVID(dev, SKL_REVID_C0, REVID_FOREVER) || IS_BROXTON(dev))
So this patch should not be able to affect an ILK target.
Regression build. CI_DRM_1201
Dmesg:
[ 200.736652] Setting dangerous option inject_load_failure - tainting kernel
[ 201.274660] Setting dangerous option inject_load_failure - tainting kernel
[ 201.827477] Setting dangerous option inject_load_failure - tainting kernel
[ 202.341648] Setting dangerous option inject_load_failure - tainting kernel
[ 205.869759] ------------[ cut here ]------------
[ 205.869769] WARNING: CPU: 1 PID: 5982 at lib/list_debug.c:29
__list_add+0x65/0xc0
[ 205.869771] list_add corruption. next->prev should be prev
(ffff8800b6832ce8), but was (null). (next=ffff8801207480f8).
[ 205.869773] Modules linked in: snd_hda_intel(+) i915 ax88179_178a usbnet mii
intel_powerclamp coretemp snd_hda_codec_hdmi crct10dif_pclmul crc32_pclmul
snd_hda_codec_generic ghash_clmulni_intel snd_hda_codec snd_hwdep lpc_ich
snd_hda_core snd_pcm mei_me mei sdhci_pci sdhci mmc_core e1000e ptp pps_core
[last unloaded: i915]
[ 205.869795] CPU: 1 PID: 5982 Comm: modprobe Tainted: G U
4.6.0-rc2-gfxbench+ #1
[ 205.869797] Hardware name: Hewlett-Packard HP EliteBook 8440p/172A, BIOS
68CCU Ver. F.24 09/13/2013
[ 205.869798] 0000000000000000 ffff8800b497faa8 ffffffff81404e65
ffff8800b497faf8
[ 205.869801] 0000000000000000 ffff8800b497fae8 ffffffff81079c7c
0000001d00000286
[ 205.869804] ffff88007ee8bb78 ffff8801207480f8 ffff8800b6832ce8
ffffffff81c52150
[ 205.869807] Call Trace:
[ 205.869811] [<ffffffff81404e65>] dump_stack+0x67/0x92
[ 205.869816] [<ffffffff81079c7c>] __warn+0xcc/0xf0
[ 205.869818] [<ffffffff81079cea>] warn_slowpath_fmt+0x4a/0x50
[ 205.869820] [<ffffffff814212c5>] __list_add+0x65/0xc0
[ 205.869824] [<ffffffff811f4fc6>] d_alloc+0x56/0x70
[ 205.869827] [<ffffffff811e7ebe>] __lookup_hash+0x2e/0x50
[ 205.869830] [<ffffffff811e7fad>] lookup_one_len+0xcd/0x120
[ 205.869833] [<ffffffff812e6509>] start_creating+0x69/0xf0
[ 205.869835] [<ffffffff812e6891>] __create_dir+0x11/0xf0
[ 205.869837] [<ffffffff812e6a80>] tracefs_create_dir+0x10/0x20
[ 205.869840] [<ffffffff8113926e>] event_create_dir+0x2ae/0x4d0
[ 205.869842] [<ffffffff811394b1>] __trace_add_new_event+0x21/0x30
[ 205.869844] [<ffffffff81139714>] trace_module_notify+0x154/0x1a0
[ 205.869848] [<ffffffff8109e1b9>] notifier_call_chain+0x39/0xa0
[ 205.869851] [<ffffffff8109e5b8>] __blocking_notifier_call_chain+0x48/0x70
[ 205.869853] [<ffffffff8109e5f1>] blocking_notifier_call_chain+0x11/0x20
[ 205.869857] [<ffffffff8110bff1>] load_module+0x1a81/0x24b0
[ 205.869860] [<ffffffff811e109c>] ? kernel_read+0x3c/0x50
[ 205.869862] [<ffffffff8110cc39>] SyS_finit_module+0xa9/0xd0
[ 205.869867] [<ffffffff817d13a9>] entry_SYSCALL_64_fastpath+0x1c/0xac
[ 205.869869] ---[ end trace 0dbd577555177c51 ]---</pre>
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