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[hjl <hjl@xxxxxxxxxxxxxxxxx>]

Hi Joseph,
Thanks a lot for your help.
I have installed kernel 4.6rc4 as recommended today and booted into same issue. Find excerpt of dmesg output here:

[   12.499797] BUG: unable to handle kernel NULL pointer dereference at 0000012c
[   12.500022] IP: [<c17b5572>] mutex_lock+0x12/0x30
[   12.500022] *pdpt = 0000000035ff7001 *pde = 0000000000000000
[   12.500022] Oops: 0002 [#1] SMP
[   12.500022] Modules linked in: nfsd auth_rpcgss nfs_acl lockd parport_pc grace ppdev sunrpc lp parport autofs4 pata_acpi hid_generic hid_cherry usbhid hid psmouse sdhci_pci r8169 pata_sch gma500_gfx sdhci i2c_algo_bit drm_kms_helper syscopyarea sysfillrect sysimgblt fb_sys_fops drm mii fjes video
[   12.500022] CPU: 0 PID: 265 Comm: plymouthd Not tainted 4.6.0-040600rc4-generic #201604172330
[   12.500022] Hardware name: CompuLab CM-iAM/SBC-FITPC2i/CM-iAM/SBC-FITPC2i, BIOS NAPA0001.86C.0000.D.1009141059 09/14/2010
[   12.500022] task: f5f95a00 ti: f3570000 task.ti: f3570000


Thanks a lot for your support
regards
Hans-Jürgen

[   12.500022] EIP: 0060:[<c17b5572>] EFLAGS: 00010286 CPU: 0
[   12.500022] EIP is at mutex_lock+0x12/0x30
[   12.500022] EAX: 0000012c EBX: 0000012c ECX: 00000000 EDX: 80000000
[   12.500022] ESI: 00000000 EDI: 00000000 EBP: f3571e90 ESP: f3571e8c
[   12.500022]  DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068
[   12.500022] CR0: 80050033 CR2: 0000012c CR3: 35ca87e0 CR4: 000006f0
[   12.500022] Stack:
[   12.500022]  f5ca82a0 f3571ea0 f8534761 f1a73900 f5e18c00 f3571eb4 f84fa450 f5e18c00
[   12.500022]  f5e18c00 f5e18c00 f3571ec4 f8b070b9 f5e18c00 f5e18c34 f3571edc f8518b6a
[   12.500022]  f756b098 00000000 00000000 f5e18c00 f3571f18 f8518ee7 00000000 00001000
[   12.500022] Call Trace:
[   12.500022]  [<f8534761>] drm_modeset_lock_all+0x31/0xb0 [drm]
[   12.500022]  [<f84fa450>] drm_fb_helper_restore_fbdev_mode_unlocked+0x20/0x70 [drm_kms_helper]
[   12.500022]  [<f8b070b9>] psb_driver_lastclose+0x19/0x50 [gma500_gfx]
[   12.500022]  [<f8518b6a>] drm_lastclose+0x2a/0x140 [drm]
[   12.500022]  [<f8518ee7>] drm_release+0x267/0x450 [drm]
[   12.500022]  [<c11eb0c1>] __fput+0xd1/0x210
[   12.500022]  [<c11eb23d>] ____fput+0xd/0x10
[   12.500022]  [<c108ba7f>] task_work_run+0x7f/0xa0
[   12.500022]  [<c1003115>] exit_to_usermode_loop+0xd5/0xe0
[   12.500022]  [<c10039e7>] do_fast_syscall_32+0x127/0x140
[   12.500022]  [<c17b7c6a>] sysenter_past_esp+0x47/0x75
[   12.500022] Code: 00 00 c3 8d b6 00 00 00 00 31 c0 5d c3 8d b6 00 00 00 00 8d bf 00 00 00 00 55 89 e5 53 3e 8d 74 26 00 89 c3 e8 70 ef ff ff 89 d8 <f0> ff 08 79 05 e8 74 07 00 00 64 a1 68 d2 c7 c1 89 43 10 5b 5d
[   12.500022] EIP: [<c17b5572>] mutex_lock+0x12/0x30 SS:ESP 0068:f3571e8c
[   12.500022] CR2: 000000000000012c
[   12.845872] ---[ end trace 92f73bfbf19bea01 ]---

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https://bugs.launchpad.net/bugs/1567781

Title:
  unable to handle kernel NULL pointer dereference at 00000134

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  Problem is found in dmesg output:
  [   11.660671] BUG: unable to handle kernel NULL pointer dereference at 00000134
  [   11.660688] IP: [<c17692b2>] mutex_lock+0x12/0x30
  [   11.660706] *pdpt = 0000000033ee5001 *pde = 0000000000000000
  [   11.660714] Oops: 0002 [#1] SMP
  [   11.660723] Modules linked in: nfsd auth_rpcgss nfs_acl lockd parport_pc grace ppdev lp sunrpc parport autofs4 hid_generic hid_cherry pata_acpi usbhid hid psmouse gma500_gfx i2c_algo_bit r8169 drm_kms_helper drm sdhci_pci pata_sch sdhci mii video
  [   11.660772] CPU: 1 PID: 242 Comm: plymouthd Not tainted 4.2.0-35-generic #40-Ubuntu
  [   11.660779] Hardware name: CompuLab CM-iAM/SBC-FITPC2i/CM-iAM/SBC-FITPC2i, BIOS NAPA0001.86C.0000.D.1009141059 09/14/2010
  [   11.660785] task: f5cf08c0 ti: f2364000 task.ti: f2364000
  [   11.660792] EIP: 0060:[<c17692b2>] EFLAGS: 00010286 CPU: 1
  [   11.660798] EIP is at mutex_lock+0x12/0x30
  [   11.660804] EAX: 00000134 EBX: 00000134 ECX: 00000000 EDX: 80000000
  [   11.660810] ESI: 00000000 EDI: 00000000 EBP: f2365ea8 ESP: f2365ea4
  [   11.660815]  DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068
  [   11.660820] CR0: 80050033 CR2: 00000134 CR3: 31a1d540 CR4: 000006f0
  [   11.660824] Stack:
  [   11.660828]  f19f93a0 f2365ec0 f8586171 f326dea0 f1ad7000 00000000 f1a0a400 f2365ec8
  [   11.660842]  f858621f f2365edc f845ff47 f1a0a400 f1a0a400 f1a0a400 f2365eec f84b6019
  [   11.660856]  f2365f04 c11b2de4 f2365f04 f856a78a f74d59d0 00000000 00000000 f1a0a400
  [   11.660869] Call Trace:
  [   11.660935]  [<f8586171>] __drm_modeset_lock_all+0x91/0x130 [drm]
  [   11.660986]  [<f858621f>] drm_modeset_lock_all+0xf/0x30 [drm]
  [   11.661018]  [<f845ff47>] drm_fb_helper_restore_fbdev_mode_unlocked+0x17/0x50 [drm_kms_helper]
  [   11.661048]  [<f84b6019>] psb_driver_lastclose+0x19/0x50 [gma500_gfx]
  [   11.661060]  [<c11b2de4>] ? kfree+0x134/0x140
  [   11.661110]  [<f856a78a>] drm_lastclose+0x2a/0x140 [drm]
  [   11.661159]  [<f856ab3f>] drm_release+0x29f/0x490 [drm]
  [   11.661170]  [<c11cd0af>] __fput+0xcf/0x210
  [   11.661179]  [<c11cd22d>] ____fput+0xd/0x10
  [   11.661189]  [<c10869af>] task_work_run+0x7f/0xa0
  [   11.661200]  [<c1012035>] do_notify_resume+0x75/0x80
  [   11.661209]  [<c176bbcb>] work_notifysig+0x16/0x1b
  [   11.661215] Code: 00 00 c3 8d b6 00 00 00 00 31 c0 5d c3 8d b6 00 00 00 00 8d bf 00 00 00 00 55 89 e5 53 3e 8d 74 26 00 89 c3 e8 60 ef ff ff 89 d8 <f0> ff 08 79 05 e8 74 07 00 00 64 a1 c8 c0 bf c1 89 43 10 5b 5d
  [   11.661311] EIP: [<c17692b2>] mutex_lock+0x12/0x30 SS:ESP 0068:f2365ea4
  [   11.661323] CR2: 0000000000000134
  [   11.661332] ---[ end trace 3bb80835d39a3e44 ]---

  ProblemType: Bug
  DistroRelease: Ubuntu 15.10
  Package: linux-image-4.2.0-35-generic 4.2.0-35.40
  ProcVersionSignature: Ubuntu 4.2.0-35.40-generic 4.2.8-ckt5
  Uname: Linux 4.2.0-35-generic i686
  ApportVersion: 2.19.1-0ubuntu5
  Architecture: i386
  AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/by-path', '/dev/snd/hwC0D0', '/dev/snd/pcmC0D2c', '/dev/snd/pcmC0D1p', '/dev/snd/pcmC0D0c', '/dev/snd/pcmC0D0p', '/dev/snd/controlC0', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1:
  Date: Fri Apr  8 08:21:26 2016
  HibernationDevice: RESUME=UUID=fda9b258-61a9-4bc5-974e-738538cee628
  InstallationDate: Installed on 2013-07-09 (1003 days ago)
  InstallationMedia: Lubuntu 13.04 "Raring Ringtail" - Release i386 (20130423.1)
  MachineType: CompuLab CM-iAM/SBC-FITPC2i
  ProcFB: 0 VESA VGA
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.2.0-35-generic root=UUID=41b7698f-f3fa-4940-8e13-9378c5021e90 ro quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-4.2.0-35-generic N/A
   linux-backports-modules-4.2.0-35-generic  N/A
   linux-firmware                            1.149.3
  RfKill:
   0: phy0: Wireless LAN
   	Soft blocked: yes
   	Hard blocked: no
  SourcePackage: linux
  UpgradeStatus: Upgraded to wily on 2015-12-23 (106 days ago)
  dmi.bios.date: 09/14/2010
  dmi.bios.vendor: Phoenix Technologies LTD
  dmi.bios.version: NAPA0001.86C.0000.D.1009141059
  dmi.board.name: CM-iAM/SBC-FITPC2i
  dmi.board.vendor: Intel Corporation
  dmi.board.version: 1.x
  dmi.chassis.asset.tag: No Asset Tag
  dmi.chassis.type: 1
  dmi.chassis.vendor: OEM
  dmi.chassis.version: N/A
  dmi.modalias: dmi:bvnPhoenixTechnologiesLTD:bvrNAPA0001.86C.0000.D.1009141059:bd09/14/2010:svnCompuLab:pnCM-iAM/SBC-FITPC2i:pvrNotApplicable:rvnIntelCorporation:rnCM-iAM/SBC-FITPC2i:rvr1.x:cvnOEM:ct1:cvrN/A:
  dmi.product.name: CM-iAM/SBC-FITPC2i
  dmi.product.version: Not Applicable
  dmi.sys.vendor: CompuLab

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