FYI, we noticed the below changes on

git://anongit.freedesktop.org/drm-intel topic/drm-misc
commit 12188d6e3a5ad24423fdc7a05ed10e4af35832d1 ("drm/core: Preserve the framebuffer after removing it.")


[   24.081524] thinkpad_acpi: Standard ACPI backlight interface available, not loading native one
[   24.081756] IOAPIC[0]: Set routing entry (1-16 -> 0x22 -> IRQ 16 Mode:1 Active:1 Dest:15)
[   24.081794] ------------[ cut here ]------------
[   24.081825] WARNING: CPU: 2 PID: 144 at drivers/gpu/drm/drm_drv.c:569 drm_dev_alloc+0x257/0x320 [drm]()
[   24.081860] Modules linked in: sdhci(+) v4l2_common libahci(+) intel_ips snd_pcsp(-) libata serio_raw pcspkr firewire_core crc_itu_t mmc_core snd_hda_intel i915(+) videodev snd_hda_codec snd_hda_core snd_hwdep shpchp drm_kms_helper syscopyarea snd_pcm sysfillrect sysimgblt fb_sys_fops snd_timer drm thinkpad_acpi(+) snd soundcore rfkill parport_pc parport wmi video acpi_cpufreq
[   24.081865] CPU: 2 PID: 144 Comm: systemd-udevd Not tainted 4.3.0-rc2-00052-g12188d6 #1
[   24.081867] Hardware name: LENOVO 25222AU/25222AU, BIOS 6IET52WW (1.12 ) 02/16/2010
[   24.081872]  ffffffffa00c92f0 ffff880076407a68 ffffffff81402692 0000000000000000
[   24.081876]  ffff880076407aa0 ffffffff81074756 ffff8800645ad000 0000000000000000
[   24.081881]  ffffffffa02d1100 ffffffffa02d1100 ffffffffa0299740 ffff880076407ab0
[   24.081882] Call Trace:
[   24.081892]  [<ffffffff81402692>] dump_stack+0x4b/0x69
[   24.081898]  [<ffffffff81074756>] warn_slowpath_common+0x86/0xc0
[   24.081903]  [<ffffffff8107484a>] warn_slowpath_null+0x1a/0x20
[   24.081924]  [<ffffffffa009c3c7>] drm_dev_alloc+0x257/0x320 [drm]
[   24.081966]  [<ffffffffa009eb3b>] drm_get_pci_dev+0x3b/0x1e0 [drm]
[   24.082015]  [<ffffffffa01e7214>] i915_pci_probe+0x34/0x50 [i915]
[   24.082020]  [<ffffffff81448b85>] local_pci_probe+0x45/0xa0
[   24.082025]  [<ffffffff81449f77>] pci_device_probe+0xd7/0x120
[   24.082032]  [<ffffffff8154b614>] driver_probe_device+0x224/0x490
[   24.082037]  [<ffffffff8154b904>] __driver_attach+0x84/0x90
[   24.082041]  [<ffffffff8154b880>] ? driver_probe_device+0x490/0x490
[   24.082045]  [<ffffffff81549334>] bus_for_each_dev+0x64/0xa0
[   24.082050]  [<ffffffff8154afae>] driver_attach+0x1e/0x20
[   24.082054]  [<ffffffff8154ab11>] bus_add_driver+0x1f1/0x290
[   24.082059]  [<ffffffff8154c2a0>] driver_register+0x60/0xe0
[   24.082063]  [<ffffffff8144852c>] __pci_register_driver+0x4c/0x50
[   24.082087]  [<ffffffffa009edc0>] drm_pci_init+0xe0/0x110 [drm]
[   24.082091]  [<ffffffffa0300000>] ? 0xffffffffa0300000
[   24.082143]  [<ffffffffa03000a6>] i915_init+0xa6/0xad [i915]
[   24.082149]  [<ffffffff81002123>] do_one_initcall+0xb3/0x1d0
[   24.082155]  [<ffffffff811c1db4>] ? kmem_cache_alloc_trace+0x1b4/0x220
[   24.082162]  [<ffffffff811647b8>] ? do_init_module+0x27/0x1e8
[   24.082166]  [<ffffffff811647f1>] do_init_module+0x60/0x1e8
[   24.082173]  [<ffffffff810f9819>] load_module+0x2089/0x24b0
[   24.082178]  [<ffffffff810f5a20>] ? __symbol_put+0x40/0x40
[   24.082183]  [<ffffffff810f9e40>] SyS_finit_module+0x80/0xb0
[   24.082189]  [<ffffffff818ad3ae>] entry_SYSCALL_64_fastpath+0x12/0x71
[   24.082192] ---[ end trace 5cbe1f0bd2dab019 ]---
--


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