Fedora 20 kernel crashes

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I have installed Fedora 20 on a new Dell OptiPlex 9020 workstation. I use about the same software set that I used on an older Dell and with Fedora 19 that was very stable. With Fedora 20 I have had several kernel crashes. I only have pictures from the console after the crashes. The crashes are not similar. Dell's own diagnostics and Memtest86+ 4.20 did not found any issues from the memory.

Kernel versions that have crashed: 3.11.10-301.fc20.x86_64 (crash1 & crash2) 3.12.5-302.fc20.x86_64 (crash3)

I'm using bcache (naturally did not use bcache in Fedora19) and VirtualBox (Fedora as host).

link:crash1.jpg link:crash2.jpg link:crash3.jpg link:memtest.jpg

Dmesg after boot can be found here.

If this is graphics related, then here's the relevant part from lspci:

00:02.0 VGA compatible controller: Intel Corporation Xeon E3-1200 v3/4th Gen Core Processor Integrated Graphics Controller (rev 06) (prog-if 00 [VGA controller])
    Subsystem: Dell Device 05a4
    Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx+
    Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
    Latency: 0
    Interrupt: pin A routed to IRQ 46
    Region 0: Memory at f7800000 (64-bit, non-prefetchable) [size=4M]
    Region 2: Memory at e0000000 (64-bit, prefetchable) [size=256M]
    Region 4: I/O ports at f000 [size=64]
    Expansion ROM at <unassigned> [disabled]
    Capabilities: [90] MSI: Enable+ Count=1/1 Maskable- 64bit-
        Address: fee00018  Data: 0000
    Capabilities: [d0] Power Management version 2
        Flags: PMEClk- DSI+ D1- D2- AuxCurrent=0mA PME(D0-,D1-,D2-,D3hot-,D3cold-)
        Status: D0 NoSoftRst- PME-Enable- DSel=0 DScale=0 PME-
    Capabilities: [a4] PCI Advanced Features
        AFCap: TP+ FLR+
        AFCtrl: FLR-
        AFStatus: TP-
    Kernel driver in use: i915

Though I'm mainly using the system remotely (ssh + vncserver), so local display is just showing login screen.

Noticed also some new messages from dmesg, no kernel crash yet...

[    2.569046] vboxpci: IOMMU not found (not registered)
[    2.725663] warning: process `daemon' used the deprecated sysctl system call with 1.2.
[    2.730872] [drm] Enabling RC6 states: RC6 on, RC6p off, RC6pp off
[    5.425515] e1000e: em1 NIC Link is Up 1000 Mbps Full Duplex, Flow Control: None
[    5.425545] IPv6: ADDRCONF(NETDEV_CHANGE): em1: link becomes ready
[  240.231831] fuse init (API version 7.22)
[60632.907563] int3: 0000 [#1] SMP 
[60632.907579] Modules linked in: fuse vboxpci(OF) vboxnetadp(OF) vboxnetflt(OF) bnep bluetooth vboxdrv(OF) cfg80211 rfkill snd_hda_codec_realtek snd_hda_codec_hdmi snd_hda_intel snd_hda_codec e1000e ptp iTCO_wdt snd_hwdep snd_seq snd_seq_device x86_pkg_temp_thermal coretemp snd_pcm iTCO_vendor_support kvm_intel kvm snd_page_alloc crct10dif_pclmul crc32_pclmul crc32c_intel ghash_clmulni_intel dcdbas snd_timer microcode shpchp serio_raw i2c_i801 pps_core lpc_ich snd mfd_core mei_me mei soundcore bcache i915 i2c_algo_bit drm_kms_helper drm i2c_core video
[60632.907743] CPU: 2 PID: 986 Comm: java Tainted: GF          O 3.12.5-302.fc20.x86_64 #1
[60632.907764] Hardware name: Dell Inc. OptiPlex 9020/0PC5F7, BIOS A02 08/15/2013
[60632.907782] task: ffff8807e6f98840 ti: ffff8807de86e000 task.ti: ffff8807de86e000
[60632.907801] RIP: 0010:[<ffffffff810ccf80>]  [<ffffffff810ccf80 ...