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Bug#821308: marked as done ([kernel] BUG: unable to handle kernel NULL pointer dereference at 0000000000000008)

Your message dated Mon, 06 Jun 2016 02:26:05 +0100
with message-id <1465176365.2847.252.camel@decadent.org.uk>
and subject line Re: Bug#821308: Bug doesn't appear in 4.5.4-1
has caused the Debian Bug report #821308,
regarding [kernel] BUG: unable to handle kernel NULL pointer dereference at 0000000000000008
to be marked as done.

This means that you claim that the problem has been dealt with.
If this is not the case it is now your responsibility to reopen the
Bug report if necessary, and/or fix the problem forthwith.

(NB: If you are a system administrator and have no idea what this
message is talking about, this may indicate a serious mail system
misconfiguration somewhere. Please contact owner@bugs.debian.org
immediately.)


-- 
821308: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=821308
Debian Bug Tracking System
Contact owner@bugs.debian.org with problems
--- Begin Message --- 
Package: kernel
Version: SMP Debian 4.4.6-1 (2016-03-17) x86_64 GNU/Linux

Severity: normal

--- Please enter the report below this line. ---

When entering hibernate or suspend or logging off I almost always get a kernel
bug and the system (Thinkpad T61) freezes. I find these lines in the logfile in
this situation:

Apr 03 22:04:15 haktar kernel: BUG: unable to handle kernel NULL pointer dereference at 0000000000000060
Apr 03 22:04:18 haktar kernel: IP: [<ffffffffa0650ad7>] intel_fb_obj_invalidate+0x17/0xf0 [i915]
Apr 03 22:04:19 haktar kernel: PGD 0 
Apr 03 22:04:19 haktar kernel: Oops: 0000 [#1] SMP 
Apr 03 22:04:19 haktar kernel: Modules linked in: sha256_ssse3 sha256_generic hmac drbg ansi_cprng ctr ccm appletalk ax25 ipx p8023 p8022 psnap llc nfsd auth_r
Apr 03 22:04:21 haktar kernel:  8250_fintek drm video i2c_algo_bit tpm_tis button tpm processor evdev joydev tun hdaps input_polldev arc4 iwl3945 iwlegacy mac8
Apr 03 22:04:21 haktar kernel: CPU: 0 PID: 1736 Comm: Xorg Not tainted 4.4.0-1-amd64 #1 Debian 4.4.6-1
Apr 03 22:04:22 haktar kernel: Hardware name: LENOVO 64665DG/64665DG, BIOS 7LETC6WW (2.26 ) 05/11/2009
Apr 03 22:04:23 haktar kernel: task: ffff880036b60400 ti: ffff8800bae44000 task.ti: ffff8800bae44000
Apr 03 22:04:23 haktar kernel: RIP: 0010:[<ffffffffa0650ad7>]  [<ffffffffa0650ad7>] intel_fb_obj_invalidate+0x17/0xf0 [i915]
Apr 03 22:04:23 haktar kernel: RSP: 0018:ffff8800bae47aa8  EFLAGS: 00010246
Apr 03 22:04:23 haktar kernel: RAX: ffff880036b60400 RBX: ffff880036fd8f00 RCX: ffff8801aee81d00
Apr 03 22:04:23 haktar kernel: RDX: ffff880135b29400 RSI: 0000000000000000 RDI: ffff880036fd8f00
Apr 03 22:04:23 haktar kernel: RBP: 0000000000000000 R08: ffffea0000022d1f R09: 0000000000000003
Apr 03 22:04:23 haktar kernel: R10: ffff880018febc60 R11: ffff88000baacc20 R12: 0000000000000000
Apr 03 22:04:23 haktar kernel: R13: ffff8800b8d03060 R14: 0000000000000080 R15: ffff8800b8d03000
Apr 03 22:04:23 haktar kernel: FS:  00007fdfecf9ea00(0000) GS:ffff88013bc00000(0000) knlGS:0000000000000000
Apr 03 22:04:23 haktar kernel: CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
Apr 03 22:04:23 haktar kernel: CR2: 0000000000000060 CR3: 0000000135cd8000 CR4: 00000000000006f0
Apr 03 22:04:23 haktar kernel: Stack:
Apr 03 22:04:23 haktar kernel:  ffff8800b8a72400 0000000000000000 0000000000200001 ffff8800b8d03060
Apr 03 22:04:23 haktar kernel:  0000000000000080 ffffffffa065a4a0 0000000035798280 ffff8800bae47c78
Apr 03 22:04:23 haktar kernel:  ffffffff8135e6d8 0000000000000000 ffff8800bae47b84 ffff8800bae47b84
Apr 03 22:04:23 haktar kernel: Call Trace:
Apr 03 22:04:23 haktar kernel:  [<ffffffffa065a4a0>] ? intel_fbdev_set_par+0x40/0x60 [i915]
Apr 03 22:04:23 haktar kernel:  [<ffffffff8135e6d8>] ? fb_set_var+0x208/0x400
Apr 03 22:04:23 haktar kernel:  [<ffffffff811ec056>] ? do_sys_poll+0x146/0x560
Apr 03 22:04:23 haktar kernel:  [<ffffffff810a8386>] ? update_curr+0xb6/0x130
Apr 03 22:04:23 haktar kernel:  [<ffffffff810ab5e9>] ? enqueue_entity+0x359/0x9b0
Apr 03 22:04:23 haktar kernel:  [<ffffffff813550c1>] ? fbcon_blank+0x2f1/0x330
Apr 03 22:04:23 haktar kernel:  [<ffffffff810a87f0>] ? check_preempt_wakeup+0xe0/0x1e0
Apr 03 22:04:23 haktar kernel:  [<ffffffff813d1428>] ? do_unblank_screen+0xd8/0x1a0
Apr 03 22:04:23 haktar kernel:  [<ffffffff813c6ae4>] ? complete_change_console+0x54/0xd0
Apr 03 22:04:23 haktar kernel:  [<ffffffff813c7238>] ? vt_ioctl+0x6d8/0x1290
Apr 03 22:04:23 haktar kernel:  [<ffffffffa04bf452>] ? drm_ioctl+0x162/0x4c0 [drm]
Apr 03 22:04:23 haktar kernel:  [<ffffffff813bae6c>] ? tty_ioctl+0x33c/0xbf0
Apr 03 22:04:23 haktar kernel:  [<ffffffff81196af1>] ? handle_mm_fault+0x10b1/0x1710
Apr 03 22:04:23 haktar kernel:  [<ffffffff811ea25e>] ? do_vfs_ioctl+0x2ae/0x490
Apr 03 22:04:23 haktar kernel:  [<ffffffff811ea4b4>] ? SyS_ioctl+0x74/0x80
Apr 03 22:04:23 haktar kernel:  [<ffffffff8158ec32>] ? system_call_fast_compare_end+0xc/0x67
Apr 03 22:04:23 haktar kernel: Code: 41 5e e9 bd f7 ff ff 0f 1f 00 66 2e 0f 1f 84 00 00 00 00 00 66 66 66 66 90 41 56 41 55 41 54 55 41 89 f4 53 48 8b 6f 08 48
Apr 03 22:04:23 haktar kernel: RIP  [<ffffffffa0650ad7>] intel_fb_obj_invalidate+0x17/0xf0 [i915]
Apr 03 22:04:24 haktar kernel:  RSP <ffff8800bae47aa8>
Apr 03 22:04:24 haktar kernel: CR2: 0000000000000060
Apr 03 22:04:24 haktar kernel: ---[ end trace cb27ca4add0222dd ]---


The log is quite old, because usually I see only the lines:
Apr 16 15:15:16 haktar kernel: BUG: unable to handle kernel 
Apr 16 15:15:16 haktar kernel: NULL pointer dereference
Apr 16 15:15:16 haktar kernel:  at 0000000000000060
Apr 16 15:15:16 haktar kernel: IP:
-- Reboot --


--- System information. ---
Architecture: amd64
Kernel:       Linux 4.4.0-1-amd64

Debian Release: stretch/sid
  700 testing         www.deb-multimedia.org 
  700 testing         security.debian.org 
  700 testing         ftp2.de.debian.org 
  600 unstable        ftp2.de.debian.org 
  500 utopic          ppa.launchpad.net 
  500 saucy           ppa.launchpad.net 
  500 grml-testing    deb.grml.org 

--- Package information. ---
Package's Depends field is empty.

Package's Recommends field is empty.

Package's Suggests field is empty.


-- 
Markus Grunwald
https://www.the-grue.de

Fragen zur Mail? https://www.the-grue.de/mail_und_co
https://www.the-grue.de/~markus/markus_grunwald.gpg

--- End Message ---
--- Begin Message --- 
Version: 4.5.4-1

On Sun, 2016-06-05 at 15:55 +0200, Markus Grunwald wrote:
> Hello Nicholas,
> 
> Yes, I can confirm that the bug doesn't appear in linux-image-4.3.5-1. I didn't
> downgrade, just never uninstalled that kernel.
> 
> Currently, I'm running this:
> 
> markus@haktar % uname -a
> Linux haktar 4.5.0-2-amd64 #1 SMP Debian 4.5.4-1 (2016-05-16) x86_64 GNU/Linux
> 
> ii  linux-image-4.5.0-2-amd64         4.5.4-1amd64                 Linux 4.5 for 64-bit PCs
> 
> I didn't see the bug until now... seems to be fixed with this version!

Therefore closing this.

Ben.

-- 
Ben Hutchings
The obvious mathematical breakthrough [to break modern encryption]
would be
development of an easy way to factor large prime numbers. - Bill Gates

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