[Bug 88845] New: [BSW]igt/gem_exec_nop/render sporadically causes system hang

Wed Jan 28 00:25:06 PST 2015

https://bugs.freedesktop.org/show_bug.cgi?id=88845

            Bug ID: 88845
           Summary: [BSW]igt/gem_exec_nop/render sporadically causes
                    system hang
           Product: DRI
           Version: unspecified
          Hardware: All
                OS: Linux (All)
            Status: NEW
          Severity: critical
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: huax.lu at intel.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 112904
  --> https://bugs.freedesktop.org/attachment.cgi?id=112904&action=edit
dmesg

==System Environment==
--------------------------
Regression:  not sure, fail rate:2/4

no-working platforms: BSW

==kernel==
--------------------------
drm-intel-nightly/70438b51bdd44180b83f10591c3bdc1832d11dc2
commit 70438b51bdd44180b83f10591c3bdc1832d11dc2
Author: Daniel Vetter <daniel.vetter at ffwll.ch>
Date:   Tue Jan 27 12:11:03 2015 +0100

    drm-intel-nightly: 2015y-01m-27d-11h-10m-41s UTC integration manifest

==Bug detailed description==
-----------------------------
It sporadically causes system hang, fail rate:2/4. Test -nightly kernel and
-next-queued kernel.

output:
IGT-Version: 1.9-gebd8b32 (x86_64) (Linux:
3.19.0-rc6_drm-intel-nightly_70438b_20150128+ x86_64)
Time to exec x 1:               375.000Âµs (ring=render)
Time to exec x 2:               102.000Âµs (ring=render)
Time to exec x 4:                27.250Âµs (ring=render)
Time to exec x 8:                18.625Âµs (ring=render)
Time to exec x 16:               13.812Âµs (ring=render)
Time to exec x 32:               10.344Âµs (ring=render)
Time to exec x 64:                8.109Âµs (ring=render)
Time to exec x 128:               7.000Âµs (ring=render)
Time to exec x 256:               6.312Âµs (ring=render)
Time to exec x 512:               5.424Âµs (ring=render)
Time to exec x 1024:              5.168Âµs (ring=render)
Time to exec x 2048:              5.700Âµs (ring=render)
Time to exec x 4096:              4.883Âµs (ring=render)
Time to exec x 8192:              4.754Âµs (ring=render)
Time to exec x 16384:             4.821Âµs (ring=render)
(gem_exec_nop:4427) CRITICAL: Test assertion failure function loop, file
gem_exec_nop.c:100:
(gem_exec_nop:4427) CRITICAL: Failed assertion: exec(fd, handle, count,
ring_id) == 0
Subtest render: FAIL (66.469s)


dmesg:
[  131.802039] ------------[ cut here ]------------
[  131.802092] WARNING: CPU: 3 PID: 4427 at
drivers/gpu/drm/i915/intel_lrc.c:506
intel_logical_ring_advance_and_submit+0x73/0x254 [i915]()
[  131.802096] execlist context submission without request
[  131.802099] Modules linked in: ipv6 dm_mod snd_hda_codec_hdmi iTCO_wdt
iTCO_vendor_support snd_hda_codec_realtek snd_hda_codec_generic serio_raw
pcspkr snd_hda_intel snd_hda_controller snd_hda_codec snd_hwdep snd_pcm lpc_ich
snd_timer mfd_core snd soundcore i2c_i801 battery ac acpi_cpufreq joydev i915
button video drm_kms_helper drm cfbfillrect cfbimgblt cfbcopyarea
[  131.802147] CPU: 3 PID: 4427 Comm: gem_exec_nop Not tainted
3.19.0-rc6_drm-intel-nightly_70438b_20150128+ #1026
[  131.802151]  0000000000000000 0000000000000009 ffffffff81799da8
ffff880175213a78
[  131.802158]  ffffffff8103bdec 0000000000012480 ffffffffa00ba963
0000000000000000
[  131.802164]  ffff8801754518b8 0000000000000000 ffff880175450000
ffff8800028e4900
[  131.802171] Call Trace:
[  131.802184]  [<ffffffff81799da8>] ? dump_stack+0x40/0x50
[  131.802193]  [<ffffffff8103bdec>] ? warn_slowpath_common+0x98/0xb0
[  131.802228]  [<ffffffffa00ba963>] ?
intel_logical_ring_advance_and_submit+0x73/0x254 [i915]
[  131.802236]  [<ffffffff8103be9c>] ? warn_slowpath_fmt+0x45/0x4a
[  131.802271]  [<ffffffffa00ba963>] ?
intel_logical_ring_advance_and_submit+0x73/0x254 [i915]
[  131.802297]  [<ffffffffa010c407>] ? logical_ring_wait_for_space+0xc2/0x150
[i915]
[  131.802333]  [<ffffffffa00bae2a>] ? intel_logical_ring_begin+0xea/0x1ea
[i915]
[  131.802341]  [<ffffffff8110d587>] ? kmem_cache_free+0xf6/0x134
[  131.802376]  [<ffffffffa00bb006>] ? gen8_emit_flush_render+0x3d/0xe1 [i915]
[  131.802411]  [<ffffffffa00bb482>] ? intel_execlists_submission+0x230/0x34b
[i915]
[  131.802441]  [<ffffffffa009e347>] ?
i915_gem_do_execbuffer.isra.12+0xca1/0xd88 [i915]
[  131.802449]  [<ffffffff8105d25f>] ? check_preempt_wakeup+0x117/0x169
[  131.802455]  [<ffffffff8105eafc>] ? enqueue_task_fair+0x441/0x88d
[  131.802462]  [<ffffffff8110d964>] ? __kmalloc+0x66/0x151
[  131.802491]  [<ffffffffa009f381>] ? i915_gem_execbuffer2+0x172/0x209 [i915]
[  131.802520]  [<ffffffffa009f20f>] ? i915_gem_execbuffer+0x350/0x350 [i915]
[  131.802538]  [<ffffffffa001070a>] ? drm_ioctl+0x279/0x3bc [drm]
[  131.802544]  [<ffffffff8105ca3d>] ? set_next_entity+0x14/0x37
[  131.802574]  [<ffffffffa009f20f>] ? i915_gem_execbuffer+0x350/0x350 [i915]
[  131.802590]  [<ffffffffa0010491>] ? drm_copy_field+0x50/0x50 [drm]
[  131.802598]  [<ffffffff81122409>] ? do_vfs_ioctl+0x412/0x459
[  131.802605]  [<ffffffff81129786>] ? __fdget+0x5/0x7
[  131.802612]  [<ffffffff81122499>] ? SyS_ioctl+0x49/0x78
[  131.802620]  [<ffffffff8179f792>] ? system_call_fastpath+0x12/0x17
[  131.802625] ---[ end trace 26c26963615ce067 ]---
[  131.802628] ------------[ cut here ]------------
[  131.802663] WARNING: CPU: 3 PID: 4427 at include/linux/kref.h:47
intel_logical_ring_advance_and_submit+0xed/0x254 [i915]()


==Reproduce steps==
---------------------------- 
1. ./gem_exec_nop --run-subtest render

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