FYI, we noticed the below changes on

git://anongit.freedesktop.org/drm-intel topic/atomic-conversion
commit 53d9f4e99de001374eb06195609cc0451f31a318 ("drm/i915: Use crtc_state->active instead of crtc_state->enable")


+--------------------------------------------------------------------------+------------+------------+
>                                                                          | cdba954e42 | 53d9f4e99d |
+--------------------------------------------------------------------------+------------+------------+
> boot_successes                                                           | 31         | 3          |
> boot_failures                                                            | 0          | 20         |
> WARNING:at_drivers/gpu/drm/i915/i915_gem.c:#i915_gem_free_object[i915]() | 0          | 20         |
> backtrace:do_vfs_ioctl                                                   | 0          | 20         |
> backtrace:SyS_ioctl                                                      | 0          | 20         |
+--------------------------------------------------------------------------+------------+------------+


<4>[   40.064862] ------------[ cut here ]------------
<4>[   40.069818] WARNING: CPU: 2 PID: 600 at /kbuild/src/lkp/drivers/gpu/drm/i915/i915_gem.c:4694 i915_gem_free_object+0x2fd/0x330 [i915]()
<4>[   40.081992] WARN_ON(obj->frontbuffer_bits)
<4>[   40.086098] Modules linked in: rpcsec_gss_krb5 auth_rpcgss nfsv4 dns_resolver sg sr_mod sd_mod cdrom coretemp snd_hda_codec_hdmi kvm_intel snd_hda_codec_conexant snd_hda_codec_generic mxm_wmi kvm ppdev crct10dif_pclmul crc32_pclmul crc32c_intel ghash_clmulni_intel aesni_intel lrw gf128mul glue_helper ablk_helper cryptd microcode pcspkr serio_raw ahci libahci intel_ips libata i2c_i801 snd_hda_intel snd_hda_controller uvcvideo videobuf2_vmalloc videobuf2_core videobuf2_memops v4l2_common snd_hda_codec snd_hda_core snd_hwdep firewire_ohci firewire_core crc_itu_t sdhci_pci snd_pcm sdhci mmc_core snd_timer shpchp i915 videodev drm_kms_helper drm thinkpad_acpi snd soundcore rfkill parport_pc parport wmi video acpi_cpufreq
<4>[   40.139844] CPU: 2 PID: 600 Comm: kms_flip Not tainted 4.1.0-rc6-00617-g53d9f4e #27
<4>[   40.142040] Hardware name: LENOVO 25222AU/25222AU, BIOS 6IET52WW (1.12 ) 02/16/2010
<47>[   40.142863] systemd-journald[118]: Compressed data object 703 -> 484
<4>[   40.145545]  ffffffffa024bdb8 ffff880074973be8 ffffffff818c0c09 ffff880067112338
<4>[   40.147129]  ffff880074973c38 ffff880074973c28 ffffffff8107672a ffff880075ed0000
<4>[   40.148769]  ffff880074964498 ffff880074964480 ffff880074964540 ffff880075ed0000
<4>[   40.150309] Call Trace:
<4>[   40.150824]  [<ffffffff818c0c09>] dump_stack+0x4c/0x65
<4>[   40.151879]  [<ffffffff8107672a>] warn_slowpath_common+0x8a/0xc0
<4>[   40.153110]  [<ffffffff810767a6>] warn_slowpath_fmt+0x46/0x50
<4>[   40.154422]  [<ffffffffa01abe95>] ? i915_vma_unbind+0x255/0x260 [i915]
<4>[   40.155819]  [<ffffffffa01acded>] i915_gem_free_object+0x2fd/0x330 [i915]
<4>[   40.157231]  [<ffffffff8109c8b6>] ? __might_sleep+0x56/0xc0
<4>[   40.158442]  [<ffffffffa009e2f7>] drm_gem_object_free+0x27/0x40 [drm]
<4>[   40.159898]  [<ffffffffa009e878>] drm_gem_object_handle_unreference_unlocked+0x118/0x130 [drm]
<4>[   40.162132]  [<ffffffffa009e944>] drm_gem_handle_delete+0xb4/0x100 [drm]
<4>[   40.163525]  [<ffffffffa009eff5>] drm_gem_close_ioctl+0x25/0x30 [drm]
<4>[   40.165220]  [<ffffffffa009f926>] drm_ioctl+0x196/0x680 [drm]
<4>[   40.166437]  [<ffffffff8119da00>] ? tlb_flush_mmu_free+0x40/0x60
<4>[   40.167683]  [<ffffffffa00a50b0>] ? drm_vm_close_locked+0x80/0xb0 [drm]
<4>[   40.169115]  [<ffffffff81201608>] do_vfs_ioctl+0x308/0x540
<4>[   40.170257]  [<ffffffff813acf77>] ? file_has_perm+0x87/0xa0
<4>[   40.171436]  [<ffffffff812018c1>] SyS_ioctl+0x81/0xa0
<4>[   40.172498]  [<ffffffff818c902e>] system_call_fastpath+0x12/0x71
<4>[   40.173789] ---[ end trace 41fb49ddff297ba5 ]---

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