FYI, we noticed the below changes on git://anongit.freedesktop.org/drm-intel for-linux-next commit 852eb00dc44ea2b8896e2fa27c6a36a1f697ba5a ("drm/i915: Try to make sure cxsr is disabled around plane enable/disable") ==> /tmp/stderr <== mount: special devic [ 32.686583] ------------[ cut here ]------------ e /dev/disk/by-i [ 32.692612] WARNING: CPU: 0 PID: 560 at drivers/gpu/drm/i915/i915_gem.c:5350 i915_gem_track_fb+0x14a/0x160 [i915]() d/ata-INTEL_SSDS [ 32.707573] WARN_ON(!(old->frontbuffer_bits & frontbuffer_bits))C2CW120A3_CVCV25 [ 32.715749] Modules linked in:2505YF120BGN-par rpcsec_gss_krb5t2 does not exis auth_rpcgss nfsv4t The file /dev dns_resolver snd_hda_codec_hdmi/disk/by-id/ata- x86_pkg_temp_thermalINTEL_SSDSC2CW12 coretemp0A3_CVCV252505YF kvm_intel kvm120BGN-part2 doe crct10dif_pclmul crc32_pclmuls not exist and i915 crc32c_intelno size was spec snd_hda_intel ghash_clmulni_intelified. mount: s aesni_intel lrwpecial device /d gf128mul glue_helperev/disk/by-id/at ablk_helper cryptda-INTEL_SSDSC2CW snd_hda_controller ppdev120A3_CVCV252505 snd_hda_codecYF120BGN-part2 d snd_hda_core snd_hwdepoes not exist ==> /tmp/stdout serio_raw pcspkr <== PATH=/usr/ shpchp microcodelocal/sbin:/usr/ snd_timerlocal/bin:/usr/s i2c_i801 sndbin:/usr/bin:/sb soundcore drmin:/bin:/lkp/lkp winbond_cir rc_core/src/bin /lkp/l i2c_hid parport_pckp/src/bin/run-l sdhci_acpikp RESULT_ROOT= parport dw_dmac/result/piglit/i video dw_dmac_coregt-057/lkp-bdw01 sdhci/debian-x86_64-2 mmc_core i2c_designware_platform015-02-07.cgz/x8 i2c_designware_core6_64-rhel/gcc-4. spi_pxa2xx_platform acpi_pad9/852eb00dc44ea2 b8896e2fa27c6a36 [ 32.827234] CPU: 0 PID: 560 Comm: kms_flip Not tainted 4.1.0-rc6-01164-g852eb00 #1 a1f697ba5a/0 jo [ 32.837418] Hardware name: Intel Corporation Broadwell Client platform/WhiteTip Mountain 1, BIOS BDW-E1R1.86C.0120.R00.1504020241 04/02/2015 b=/lkp/scheduled [ 32.837768] systemd-journald[118]: Compressed data object 585 -> 428 [ 32.862000] ffffffffa0474678/lkp-bdw01/bisec ffff88007abcfa88 ffffffff818e4f79t_piglit-igt-057 ffff88014ec12378 -debian-x86_64-2 [ 32.873613] ffff88007abcfad8015-02-07.cgz-x8 ffff88007abcfac8 ffffffff8107672a6_64-rhel-852eb0 ffff88007abcfaf8 0dc44ea2b8896e2f [ 32.886767] 0000000000000001a27c6a36a1f697ba 0000000000000000 ffff88007aab42405a-20150707-2412 ffff88007b3c9800 run-job /lkp/sc [ 32.904277] [<ffffffff818e4f79>] dump_stack+0x4c/0x65 heduled/lkp-bdw0 [ 32.911670] [<ffffffff8107672a>] warn_slowpath_common+0x8a/0xc0 1/bisect_piglit- [ 32.920059] [<ffffffff810767a6>] warn_slowpath_fmt+0x46/0x50 igt-057-debian-x [ 32.928153] [<ffffffffa03d20ba>] i915_gem_track_fb+0x14a/0x160 [i915] 86_64-2015-02-07 [ 32.937119] [<ffffffffa0414cb8>] intel_pre_plane_update+0x98/0x180 [i915] .cgz-x86_64-rhel [ 32.946480] [<ffffffffa041525d>] __intel_set_mode+0xcd/0x920 [i915] -852eb00dc44ea2b [ 32.955260] [<ffffffffa041c3a0>] intel_crtc_set_config+0x420/0x5a0 [i915] 8896e2fa27c6a36a [ 32.964608] [<ffffffff818ea989>] ? mutex_lock+0x29/0x50 1f697ba5a-201507 [ 32.972213] [<ffffffffa0173346>] drm_mode_set_config_internal+0x66/0x100 [drm] 07-24127-afdry6- [ 32.982065] [<ffffffffa0177539>] drm_mode_setcrtc+0x189/0x540 [drm] 0.yaml wget --l [ 32.990836] [<ffffffffa0167936>] drm_ioctl+0x196/0x680 [drm] ocal-encoding=UT [ 32.998919] [<ffffffff812016d8>] do_vfs_ioctl+0x308/0x540 F-8 http://inn:8 [ 33.006661] [<ffffffff813ad047>] ? file_has_perm+0x87/0xa0 0/~lkp/cgi-bin/l [ 33.014590] [<ffffffff811ecadc>] ? vfs_write+0x14c/0x1b0 kp-jobfile-appen [ 33.022280] [<ffffffff81201991>] SyS_ioctl+0x81/0xa0 d-var?job_file=/ [ 33.029543] [<ffffffff81014fc4>] ? sys_rt_sigreturn+0xb4/0xc0 lkp/scheduled/lk [ 33.037764] [<ffffffff818ed36e>] system_call_fastpath+0x12/0x71 p-bdw01/bisect_p [ 33.046147] ---[ end trace 6c029ac8c5f4ef39 ]--- iglit-igt-057-de To reproduce: git clone git://git.kernel.org/pub/scm/linux/kernel/git/wfg/lkp-tests.git cd lkp-tests bin/lkp install job.yaml # job file is attached in this email bin/lkp run job.yaml Thanks, Ying Huang