[Bug 86187] [BDW Regression]igt/kms_setmode/clone-exclusive-crtc takes more than 10 minutes and causes BUG: unable to handle kernel NULL pointer dereference at (null)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=86187

Li Xu <li.l.xu at intel.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEEDINFO                    |ASSIGNED

--- Comment #2 from Li Xu <li.l.xu at intel.com> ---
We tried with the latest-nightly ,and it seems that hang/timeout has
disappeared.But the it shows that:

n-subtest clone-exclusive-crtc
IGT-Version: 1.8-gd807891 (x86_64) (Linux:
3.18.0-rc5_drm-intel-nightly_18748b_20141121+ x86_64)
Testing: clone-exclusive-crtc 2 connector combinations
  Test id#1 CRTC count 2
    CRTC[8] [Pipe A] Mode: 1920x1080 at 60Hz Connectors: eDP-1[19]
    CRTC[12] [Pipe B] Mode: 640x480 at 60Hz Connectors: HDMI-A-1[32] (NC)
Test assertion failure function test_crtc_config, file kms_setmode.c:431:
Failed assertion: config_failed == !!(tconf->flags & TEST_INVALID)
Last errno: 22, Invalid argument
Subtest clone-exclusive-crtc: FAIL (0.078s)


And the dmesg call trace

[   72.460042] Call Trace:
[   72.460048]  [<ffffffff81789572>] ? dump_stack+0x41/0x51
[   72.460052]  [<ffffffff810368cc>] ? warn_slowpath_common+0x78/0x90
[   72.460062]  [<ffffffffa00e61ca>] ? intel_ddi_compute_config+0x3a/0x6f
[i915]
[   72.460065]  [<ffffffff8103697c>] ? warn_slowpath_fmt+0x45/0x4a
[   72.460074]  [<ffffffffa00e61ca>] ? intel_ddi_compute_config+0x3a/0x6f
[i915]
[   72.460085]  [<ffffffffa00d33a9>] ? intel_modeset_pipe_config+0x3d5/0x935
[i915]
[   72.460091]  [<ffffffffa0012ffb>] ? drm_ut_debug_printk+0x59/0x5e [drm]
[   72.460102]  [<ffffffffa00d60bc>] ? intel_crtc_set_config+0x772/0xbf5 [i915]
[   72.460109]  [<ffffffffa0017f54>] ? drm_mode_set_config_internal+0x4e/0xd2
[drm]
[   72.460116]  [<ffffffffa001ba4d>] ? drm_mode_setcrtc+0x3e9/0x48e [drm]
[   72.460121]  [<ffffffffa0010738>] ? drm_ioctl+0x279/0x3bc [drm]
[   72.460124]  [<ffffffff810e877f>] ? tlb_finish_mmu+0xb/0x2f
[   72.460130]  [<ffffffffa001b664>] ? drm_mode_setplane+0x1ce/0x1ce [drm]
[   72.460135]  [<ffffffffa000fac7>] ? drm_gem_vm_close+0x2a/0x4b [drm]
[   72.460139]  [<ffffffff8111a76f>] ? do_vfs_ioctl+0x3ec/0x435
[   72.460141]  [<ffffffff8111a801>] ? SyS_ioctl+0x49/0x78
[   72.460144]  [<ffffffff8178ec12>] ? system_call_fastpath+0x12/0x17
[   72.460146] ---[ end trace 8f48497b96dbe155 ]---
[   72.460148] ------------[ cut here ]------------
[   72.460158] WARNING: CPU: 0 PID: 4694 at drivers/gpu/drm/i915/intel_dp.c:140
intel_dp_max_link_bw+0x6f/0x77 [i915]()
[   72.460159] invalid max DP link bw val 0, using 1.62Gbps
[   72.460160] Modules linked in: snd_hda_codec_hdmi pcspkr snd_hda_intel
snd_hda_controller snd_hda_codec snd_hwdep snd_pcm i2c_i801 lpc_ich snd_timer
mfd_core snd soundcore dm_mod battery parport_pc parport ac acpi_cpufreq i915
button video drm_kms_helper drm cfbfillrect cfbimgblt cfbcopyarea
[   72.460172] CPU: 0 PID: 4694 Comm: kms_setmode Tainted: G     U  W     
3.18.0-rc5_drm-intel-nightly_18748b_20141121+ #1774
[   72.460172]  0000000000000000 0000000000000009 ffffffff81789572
ffff8801441efaf8
[   72.460175]  ffffffff810368cc ffff880002c39000 ffffffffa00eb919
0000000000000009

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