[Bug 80081] New: [HSW Regression]igt/pm_rpm/system-suspend cause " WARNING: CPU: 7 PID: 786 at drivers/gpu/drm/i915/i915_gem.c:1644 i915_gem_release_all_mmaps+0x28/0x7e [i915]()"

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=80081

          Priority: high
            Bug ID: 80081
          Keywords: bisect_pending
                CC: intel-gfx-bugs at lists.freedesktop.org
          Assignee: intel-gfx-bugs at lists.freedesktop.org
           Summary: [HSW Regression]igt/pm_rpm/system-suspend cause "
                    WARNING: CPU: 7 PID: 786 at
                    drivers/gpu/drm/i915/i915_gem.c:1644
                    i915_gem_release_all_mmaps+0x28/0x7e [i915]()"
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: normal
    Classification: Unclassified
                OS: All
          Reporter: jinxianx.guo at intel.com
          Hardware: Other
            Status: NEW
           Version: unspecified
         Component: DRM/Intel
           Product: DRI

Created attachment 101147
  --> https://bugs.freedesktop.org/attachment.cgi?id=101147&action=edit
dmesg

==System Environment==
--------------------------
Regression: Yes. 
Good commit on -next-queued: e6a7e5d0fd778bc6cf295414b9937723091c9bb6

Non-working platforms: HSW

==kernel==
--------------------------
origin/drm-intel-nightly: b438e8793c6d18b0998d75cdf8115a5898ed21d1(fails)
    drm-intel-nightly: 2014y-06m-13d-22h-09m-12s integration manifest
origin/drm-intel-next-queued: 868d665b43473e230d560d5186535270a3d57a19(fails)
    drm/i915: Fix memory leak in intel_dsi_init() error path
origin/drm-intel-fixes: 223a6f2b975ab35d93270ea1d4fb6e0ac6b27fe6(fails)
    drm/i915/bdw: remove erroneous chv specific workarounds from bdw code

==Bug detailed description==
-----------------------------
igt/pm_rpm/system-suspend cause " WARNING: CPU: 7 PID: 786 at
drivers/gpu/drm/i915/i915_gem.c:1644 i915_gem_release_all_mmaps+0x28/0x7e
[i915]()"

Dmesg shows:
[  834.731242] WARNING: CPU: 7 PID: 786 at drivers/gpu/drm/i915/i915_gem.c:1644
i915_gem_release_all_mmaps+0x28/0x7e [i915]()
[  834.731243] Modules linked in: ip6table_filter ip6_tables ebtable_nat
ebtables nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack nf_conntrack ipt_REJECT
iptable_mangle xt_tcpudp iptable_filter ip_tables x_tables bridge stp llc ipv6
dm_mod snd_hda_codec_realtek snd_hda_codec_generic snd_hda_codec_hdmi iTCO_wdt
iTCO_vendor_support firewire_ohci pcspkr serio_raw i2c_i801 firewire_core
crc_itu_t lpc_ich snd_hda_intel mfd_core snd_hda_controller snd_hda_codec
snd_hwdep snd_pcm snd_timer snd soundcore battery wmi acpi_cpufreq i915 video
button drm_kms_helper drm
[  834.731259] CPU: 7 PID: 786 Comm: kworker/7:1 Not tainted
3.15.0-rc8_drm-intel-next-queued_868d66_20140616+ #3606
[  834.731260] Hardware name:                  /DZ87KLT75K, BIOS
KLZ8711D.86A.0336.2013.0516.1957 05/16/2013
[  834.731263] Workqueue: pm pm_runtime_work
[  834.731264]  0000000000000000 0000000000000009 ffffffff817722c4
0000000000000000
[  834.731266]  ffffffff81036e54 ffff880255affca0 ffffffffa007f3ab
ffff880255affcf8
[  834.731267]  ffff880250dd0000 ffff880256268898 ffff880250dd7908
ffff88025175a060
[  834.731269] Call Trace:
[  834.731273]  [<ffffffff817722c4>] ? dump_stack+0x41/0x51
[  834.731276]  [<ffffffff81036e54>] ? warn_slowpath_common+0x78/0x90
[  834.731281]  [<ffffffffa007f3ab>] ? i915_gem_release_all_mmaps+0x28/0x7e
[i915]
[  834.731287]  [<ffffffffa007f3ab>] ? i915_gem_release_all_mmaps+0x28/0x7e
[i915]
[  834.731291]  [<ffffffffa0065458>] ? intel_runtime_suspend+0xe2/0x812 [i915]
[  834.731295]  [<ffffffff81342af8>] ? pci_pm_runtime_suspend+0x60/0x119
[  834.731296]  [<ffffffff813cf058>] ? __rpm_callback+0x28/0x4c
[  834.731298]  [<ffffffff813cf0c7>] ? rpm_callback+0x4b/0x69
[  834.731299]  [<ffffffff813cf62c>] ? rpm_suspend+0x262/0x417
[  834.731304]  [<ffffffffa0070cf3>] ? intel_gen6_powersave_work+0xf0f/0xf1e
[i915]
[  834.731306]  [<ffffffff813d03e3>] ? pm_runtime_work+0x65/0x7b
[  834.731308]  [<ffffffff8104aade>] ? process_one_work+0x1e2/0x363
[  834.731310]  [<ffffffff8104b385>] ? worker_thread+0x1c7/0x2bc
[  834.731312]  [<ffffffff8104b1be>] ? manage_workers.isra.23+0x1b5/0x1b5
[  834.731314]  [<ffffffff8104fb32>] ? kthread+0xc5/0xcd
[  834.731315]  [<ffffffff8104fa6d>] ? kthread_freezable_should_stop+0x40/0x40
[  834.731318]  [<ffffffff8177e0bc>] ? ret_from_fork+0x7c/0xb0
[  834.731319]  [<ffffffff8104fa6d>] ? kthread_freezable_should_stop+0x40/0x40


==Reproduce steps==
---------------------------- 
1. ./pm_rpm --run-subtest system-suspend

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