[Bug 93580] New: intel_fbdev_restore_mode derefence null pointer

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=93580

            Bug ID: 93580
           Summary: intel_fbdev_restore_mode derefence null pointer
           Product: DRI
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: gustav.fagerlind at gmail.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

kernel: BUG: unable to handle kernel NULL pointer dereference at
00000000000000a8
 kernel: IP: [<ffffffffa0538208>] intel_fbdev_restore_mode+0x48/0x80 [i915]
 kernel: PGD 7ab3a067 PUD 7925b067 PMD 0 
 kernel: Oops: 0000 [#1] PREEMPT SMP 
 kernel: Modules linked in: nvram msr joydev mousedev arc4 cyapatp crc_itu_t
atmel_mxt_ts intel_rapl iosf_mbi x86_pkg_temp_thermal intel_powerclamp ath9k
kvm_intel ath9k_common ath9k_hw ath kvm mac80211 i915 coretemp iTCO_wdt
snd_hda_codec_realtek iTCO_vendor_support drm_kms_helper snd_hda_codec_generic
crct10dif_pclmul chromeos_laptop cfg80211 snd_hda_intel crc32_pclmul
crc32c_intel evdev input_leds snd_hda_codec cryptd mac_hid serio_raw pcspkr
snd_hda_core fan rfkill i2c_i801 thermal battery snd_hwdep ac snd_pcm drm
dw_dmac gpio_lynxpoint fjes video snd_timer 8250_dw i2c_designware_platform snd
shpchp spi_pxa2xx_platform intel_gtt soundcore syscopyarea dw_dmac_pci button
sysfillrect sysimgblt fb_sys_fops i2c_algo_bit i2c_designware_pci
i2c_designware_core dw_dmac_core lpc_ich acpi_cpufreq processor
 kernel:  sch_fq_codel ip_tables x_tables ext4 crc16 mbcache jbd2 sd_mod atkbd
libps2 ahci libahci libata scsi_mod i8042 sdhci_acpi serio sdhci led_class
mmc_core xhci_pci xhci_hcd usbcore usb_common
 kernel: CPU: 0 PID: 224 Comm: Xorg.wrap Not tainted 4.3.3-2-ARCH #1
 kernel: Hardware name: GOOGLE Peppy/Peppy, BIOS 4.0-6588-g4acd8ea-dirty
09/04/2014
 kernel: task: ffff88017487d940 ti: ffff88007a9d4000 task.ti: ffff88007a9d4000
 kernel: RIP: 0010:[<ffffffffa0538208>]  [<ffffffffa0538208>]
intel_fbdev_restore_mode+0x48/0x80 [i915]
 kernel: RSP: 0018:ffff88007a9d7d38  EFLAGS: 00010246
 kernel: RAX: 0000000000000000 RBX: ffff880079151000 RCX: 0000000000000000
 kernel: RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff88007a9df860
 kernel: RBP: ffff88007a9d7d40 R08: 0000000000000000 R09: 0000000000000000
 kernel: R10: ffff880176c55000 R11: 0000000000000033 R12: ffff88007a9df800
 kernel: R13: ffff880176878ae0 R14: ffff88007a9df888 R15: ffff880176878ad8
 kernel: FS:  00007f43936f6700(0000) GS:ffff88017ca00000(0000)
knlGS:0000000000000000
 kernel: CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
 kernel: CR2: 00000000000000a8 CR3: 000000007a98b000 CR4: 00000000000406f0
 kernel: Stack:
 kernel:  ffff88007a9df800 ffff88007a9d7d50 ffffffffa05618fe ffff88007a9d7d70
 kernel:  ffffffffa02e1a2e 0000000000000000 ffff88007a9df800 ffff88007a9d7dd0
 kernel:  ffffffffa02e1e56 0000000000000040 0000000000000246 ffff88007abb8cc0
 kernel: Call Trace:
 kernel:  [<ffffffffa05618fe>] i915_driver_lastclose+0xe/0x20 [i915]
 kernel:  [<ffffffffa02e1a2e>] drm_lastclose+0x2e/0x140 [drm]
 kernel:  [<ffffffffa02e1e56>] drm_release+0x316/0x500 [drm]
 kernel:  [<ffffffff811db2fc>] __fput+0x9c/0x1f0
 kernel:  [<ffffffff811db48e>] ____fput+0xe/0x10
 kernel:  [<ffffffff81091173>] task_work_run+0x73/0x90
 kernel:  [<ffffffff810039f6>] prepare_exit_to_usermode+0xd6/0x100
 kernel:  [<ffffffff81003aed>] syscall_return_slowpath+0xcd/0x1d0
 kernel:  [<ffffffff811eb5f5>] ? do_vfs_ioctl+0x295/0x480
 kernel:  [<ffffffff81091074>] ? task_work_add+0x44/0x60
 kernel:  [<ffffffff811db4d7>] ? fput+0x47/0x90
 kernel:  [<ffffffff811d7916>] ? filp_close+0x56/0x70
 kernel:  [<ffffffff811f5e5b>] ? __close_fd+0x8b/0xb0
 kernel:  [<ffffffff81583e8c>] int_ret_from_sys_call+0x25/0x8f
 kernel: Code: e8 ae b7 f6 ff 84 c0 74 0c f6 05 5f 30 de ff 01 75 35 5b 5d c3
48 8b 43 08 48 8d 78 60 e8 31 99 04 e1 48 8b 83 a0 00 00 00 31 f6 <48> 8b b8 a8
00 00 00 e8 6c 59 ff ff 48 8b 7b 08 48 83 c7 60 e8 
 kernel: RIP  [<ffffffffa0538208>] intel_fbdev_restore_mode+0x48/0x80 [i915]
 kernel:  RSP <ffff88007a9d7d38>
 kernel: CR2: 00000000000000a8
 kernel: ---[ end trace 919f6f89825da079 ]---
 systemd[1]: Started Load/Save Screen Backlight Brightness of
backlight:intel_backlight.
 systemd[1]: x at vt7.service: Control process exited, code
 systemd[1]: Failed to start X on vt7.

uname -a
Linux ARCHBOOK 4.3.3-2-ARCH #1 SMP PREEMPT Wed Dec 23 20:09:18 CET 2015 x86_64
GNU/Linux

lspci -vnn | grep VGA -A 1
00:02.0 VGA compatible controller [0300]: Intel Corporation Haswell-ULT
Integrated Graphics Controller [8086:0a06] (rev 0b) (prog-if 00 [VGA
controller])
    Subsystem: Acer Incorporated [ALI] Device [1025:0a11]

Some other info: 
 This has happend once so far on linux 4.3.3, during start up (so ~5%). Boot
halted and screen was blank. I do not have any other info, its more of an FYI.
Please let me know if there is information left out. Please give me pointers on
how I can try to find out the root cause.

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