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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] dma mapping leak on unloading intel-agp.ko"
href="https://bugs.freedesktop.org/show_bug.cgi?id=93793">93793</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>[BAT ILK] dma mapping leak on unloading intel-agp.ko
</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>daniel@ffwll.ch
</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>Detailed results at
<a href="http://benchsrv.fi.intel.com/archive/results/CI_IGT_test/CI_DRM_992/ilk-hp8440p/html/ilk-hp8440p@CI_DRM_992@1/igt@drv_module_reload_basic.html">http://benchsrv.fi.intel.com/archive/results/CI_IGT_test/CI_DRM_992/ilk-hp8440p/html/ilk-hp8440p@CI_DRM_992@1/igt@drv_module_reload_basic.html</a>
Looks like we leak the gmch dma mapping or similar when unloading intel-agp.ko.
Needs dma mapping debugging enabled.
[ 256.997445] ------------[ cut here ]------------
[ 256.997455] WARNING: CPU: 3 PID: 5808 at lib/dma-debug.c:974
dma_debug_device_change+0x179/0x1e0()
[ 256.997457] pci 0000:00:02.0: DMA-API: device driver has pending DMA
allocations while released from device [count=1]
One of leaked entries details: [device address=0x0000000000050000] [size=4096
bytes] [mapped with DMA_BIDIRECTIONAL] [mapped as page]
[ 256.997459] Modules linked in: ax88179_178a usbnet mii intel_powerclamp
i915(-) coretemp crct10dif_pclmul crc32_pclmul lpc_ich mei_me mei sdhci_pci
sdhci mmc_core e1000e ptp pps_core
[ 256.997475] CPU: 3 PID: 5808 Comm: rmmod Tainted: G U
4.4.0-gfxbench+ #1
[ 256.997476] Hardware name: Hewlett-Packard HP EliteBook 8440p/172A, BIOS
68CCU Ver. F.24 09/13/2013
[ 256.997478] ffffffff81a93aa0 ffff880131733c78 ffffffff813e00ac
ffff880131733cc0
[ 256.997481] ffff880131733cb0 ffffffff810746f1 ffff8800b6eea6b8
0000000000000001
[ 256.997483] ffff8800b6440e38 ffffffff81a682cf ffff8800b6d191e0
ffff880131733d10
[ 256.997486] Call Trace:
[ 256.997490] [<ffffffff813e00ac>] dump_stack+0x4e/0x82
[ 256.997494] [<ffffffff810746f1>] warn_slowpath_common+0x81/0xc0
[ 256.997495] [<ffffffff81074777>] warn_slowpath_fmt+0x47/0x50
[ 256.997501] [<ffffffff810c59e4>] ? trace_hardirqs_on_caller+0x124/0x1b0
[ 256.997503] [<ffffffff81412879>] dma_debug_device_change+0x179/0x1e0
[ 256.997508] [<ffffffff81096fc9>] notifier_call_chain+0x39/0xa0
[ 256.997510] [<ffffffff810973c8>] __blocking_notifier_call_chain+0x48/0x70
[ 256.997512] [<ffffffff81097401>] blocking_notifier_call_chain+0x11/0x20
[ 256.997517] [<ffffffff8151edd0>] __device_release_driver+0x100/0x130
[ 256.997519] [<ffffffff8151eef3>] driver_detach+0xb3/0xc0
[ 256.997521] [<ffffffff8151df23>] bus_remove_driver+0x53/0xd0
[ 256.997524] [<ffffffff8151f917>] driver_unregister+0x27/0x50
[ 256.997526] [<ffffffff814287a5>] pci_unregister_driver+0x25/0x70
[ 256.997529] [<ffffffff814fce94>] drm_pci_exit+0x74/0x90
[ 256.997556] [<ffffffffa01cc210>] i915_exit+0x20/0x19b [i915]
[ 256.997560] [<ffffffff810ffbbc>] SyS_delete_module+0x18c/0x1f0
[ 256.997563] [<ffffffff8179e75b>] entry_SYSCALL_64_fastpath+0x16/0x73
[ 256.997564] ---[ end trace a8f932670a4ca3db ]---
[ 256.997565] Mapped at:
[ 256.997567] [<ffffffff81413778>] debug_dma_map_page+0x88/0x150
[ 256.997569] [<ffffffff814ccce5>] intel_gmch_probe+0x4c5/0xa10
[ 256.997571] [<ffffffff814cb3c2>] agp_intel_probe+0x42/0x1a0
[ 256.997576] [<ffffffff81429847>] pci_device_probe+0x87/0xf0
[ 256.997578] [<ffffffff8151e911>] driver_probe_device+0x221/0x4a0</pre>
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