<html>
<head>
<base href="https://bugs.freedesktop.org/" />
</head>
<body><table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - intel_fbdev_restore_mode derefence null pointer"
href="https://bugs.freedesktop.org/show_bug.cgi?id=93580">93580</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>intel_fbdev_restore_mode derefence null pointer
</td>
</tr>
<tr>
<th>Product</th>
<td>DRI
</td>
</tr>
<tr>
<th>Version</th>
<td>unspecified
</td>
</tr>
<tr>
<th>Hardware</th>
<td>x86-64 (AMD64)
</td>
</tr>
<tr>
<th>OS</th>
<td>Linux (All)
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>medium
</td>
</tr>
<tr>
<th>Component</th>
<td>DRM/Intel
</td>
</tr>
<tr>
<th>Assignee</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>gustav.fagerlind@gmail.com
</td>
</tr>
<tr>
<th>QA Contact</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr>
<tr>
<th>CC</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr></table>
<p>
<div>
<pre>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]: <a href="mailto:x@vt7.service">x@vt7.service</a>: 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.</pre>
</div>
</p>
<hr>
<span>You are receiving this mail because:</span>
<ul>
<li>You are the QA Contact for the bug.</li>
<li>You are on the CC list for the bug.</li>
<li>You are the assignee for the bug.</li>
</ul>
</body>
</html>