Starting at around R51-8099.0.0, Gandof has aborted the graphics_Sanity test about 50% of the time.  The failure logs all appear to contain crashes.  This same problem does not happen on M50 or M49.

https://wmatrix.googleplex.com/platform/unfiltered?hide_missing=True&tests=graphics_Sanity&days_back=14&releases=tot&platforms=gandof

Example: https://pantheon.corp.google.com/storage/browser/chromeos-autotest-results/58362930-chromeos-test/chromeos4-row5-rack6-host9/

[  284.148907] WARNING: CPU: 0 PID: 19204 at /mnt/host/source/src/third_party/kernel/v3.14/drivers/gpu/drm/i915/intel_display.c:767 intel_wait_for_vblank+0xe0/0x1ce()
[  284.148921] vblank wait timed out
[  284.148925] Modules linked in: evdi i2c_dev uinput iwlmvm memc_x86 x86_pkg_temp_thermal iwl7000_mac80211 rfcomm iio_trig_sysfs iwlwifi snd_hda_codec_hdmi snd_hda_codec_realtek snd_hda_codec_generic snd_soc_sst_acpi snd_hda_intel snd_hda_controller snd_hda_codec snd_hwdep zram fuse cfg80211 nf_conntrack_ipv6 nf_defrag_ipv6 ip6table_filter ip6_tables smsc95xx smsc75xx usbnet mii btusb btbcm btintel bluetooth uvcvideo videobuf2_vmalloc cros_ec_accel kfifo_buf industrialio joydev snd_seq_midi snd_seq_midi_event snd_rawmidi snd_seq snd_seq_device ppp_async ppp_generic slhc tun
[  284.149025] CPU: 0 PID: 19204 Comm: windowmanagerte Tainted: G        W    3.14.0 #1
[  284.149033] Hardware name: GOOGLE Gandof, BIOS Google_Gandof.6301.155.9 07/30/2015
[  284.149041]  0000000000000000 000000005f9eb5aa ffff880064e9f9c0 ffffffff8759b5c3
[  284.149053]  ffff880064e9fa08 ffff880064e9f9f8 ffffffff8703df72 ffffffff872f9c27
[  284.149064]  ffff880078400000 0000000000070040 00000000000001bb 00000000ffffc196
[  284.149075] Call Trace:
[  284.149082]  [<ffffffff8759b5c3>] dump_stack+0x4d/0x6f
[  284.149092]  [<ffffffff8703df72>] warn_slowpath_common+0x7f/0x98
[  284.149101]  [<ffffffff872f9c27>] ? intel_wait_for_vblank+0xe0/0x1ce
[  284.149110]  [<ffffffff8703dfe2>] warn_slowpath_fmt+0x57/0x73
[  284.149119]  [<ffffffff873314f9>] ? gen6_read32+0xa4/0xb2
[  284.149127]  [<ffffffff872f9c27>] intel_wait_for_vblank+0xe0/0x1ce
[  284.149135]  [<ffffffff872fb1c8>] intel_enable_primary_plane+0xc8/0xd3
[  284.149144]  [<ffffffff872ffbdb>] haswell_crtc_enable+0x500/0x55d
[  284.149153]  [<ffffffff8730d2c1>] ? intel_ddi_mode_set+0x59/0x179
[  284.149162]  [<ffffffff87300fe0>] __intel_set_mode+0xc51/0x11ba
[  284.149170]  [<ffffffff872077d4>] ? idr_alloc+0xb9/0xdf
[  284.149178]  [<ffffffff87207557>] ? idr_get_empty_slot+0x20d/0x337
[  284.149187]  [<ffffffff87303687>] intel_set_mode+0x14/0x2a
[  284.149195]  [<ffffffff8730403d>] intel_crtc_set_config+0x89c/0x95a
[  284.149204]  [<ffffffff872c23bf>] drm_mode_set_config_internal+0x5b/0xe5
[  284.149213]  [<ffffffff872cf2a1>] commit_crtc_state+0x165/0x21c
[  284.149221]  [<ffffffff872cee4c>] atomic_commit.isra.3+0x54/0xae
[  284.149229]  [<ffffffff872ceeb7>] drm_atomic_commit+0x11/0x13
[  284.149237]  [<ffffffff872c5cfa>] drm_mode_setcrtc+0x2f2/0x392
[  284.149246]  [<ffffffff872b7718>] drm_ioctl+0x2f2/0x421
[  284.149253]  [<ffffffff872c5a08>] ? drm_mode_setplane+0x9c/0x9c
[  284.149262]  [<ffffffff87120553>] do_vfs_ioctl+0x355/0x416
[  284.149271]  [<ffffffff870fb2d5>] ? do_brk+0x1ae/0x283
[  284.149279]  [<ffffffff8712066b>] SyS_ioctl+0x57/0x79
[  284.149288]  [<ffffffff875a081c>] system_call_fastpath+0x20/0x25
[  284.149295] ---[ end trace b6725c12c5fc8357 ]---