Additional info:
reporter:       libreport-2.1.4
general protection fault: 0000 [#1] SMP 
Modules linked in: fuse ebtable_nat ipt_MASQUERADE nf_conntrack_netbios_ns nf_conntrack_broadcast ip6table_nat nf_nat_ipv6 ip6table_mangle ip6t_REJECT nf_conntrack_ipv6 nf_defrag_ipv6 iptable_nat nf_nat_ipv4 nf_nat iptable_mangle nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack nf_conntrack bnep bluetooth ebtable_filter ebtables rfkill ip6table_filter ip6_tables vboxvideo(OF) drm vboxsf(OF) snd_intel8x0 snd_ac97_codec ac97_bus snd_seq snd_seq_device ppdev snd_pcm snd_page_alloc snd_timer snd soundcore parport_pc joydev i2c_piix4 i2c_core vboxguest(OF) parport e1000 microcode binfmt_misc uinput
CPU 0 
Pid: 2129, comm: cinnamon Tainted: GF          O 3.9.4-300.fc19.x86_64 #1 innotek GmbH VirtualBox/VirtualBox
RIP: 0010:[<ffffffffa006af86>]  [<ffffffffa006af86>] vbglPhysHeapExcludeBlock+0x16/0x60 [vboxguest]
RSP: 0018:ffff88005c8e1b70  EFLAGS: 00010202
RAX: 0001000000000002 RBX: ffff8800371e0244 RCX: ffff8800371f0000
RDX: ffff8800371e021c RSI: ffff8800371e021c RDI: ffff8800371e02a0
RBP: ffff88005c8e1b70 R08: 000000000000000a R09: 0000000000000209
R10: 0000000000000000 R11: ffff88005c8e1796 R12: ffff8800371e021c
R13: 00000000fffffffe R14: ffff88007b15f710 R15: ffff88007b15f710
FS:  00007fc1ccc31a00(0000) GS:ffff88007fc00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fc1af0adc20 CR3: 000000005c85a000 CR4: 00000000000006f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Process cinnamon (pid: 2129, threadinfo ffff88005c8e0000, task ffff88005fd25dc0)
Stack:
 ffff88005c8e1b90 ffffffffa006b499 ffff8800371e0244 ffff8800371e0244
 ffff88005c8e1ba8 ffffffffa006993e ffff88007b15f720 ffff88005c8e1d68
 ffffffffa006a360 ffff88005c8e1cd0 ffff88005c8e1cc0 00000000815dc3e7
Call Trace:
 [<ffffffffa006b499>] VbglPhysHeapFree+0xc9/0xe0 [vboxguest]
 [<ffffffffa006993e>] VbglGRFree+0x1e/0x30 [vboxguest]
 [<ffffffffa006a360>] VbglR0HGCMInternalCall+0x790/0xe70 [vboxguest]
 [<ffffffffa00664d0>] ? VBoxGuestHGCMAsyncWaitCallback+0x20/0x20 [vboxguest]
 [<ffffffff8112f8dd>] ? unlock_page+0x2d/0x50
 [<ffffffff811583e1>] ? do_wp_page+0x3a1/0x820
 [<ffffffffa00666f5>] VBoxGuestCommonIOCtl_HGCMCall+0x135/0x320 [vboxguest]
 [<ffffffffa0067af2>] VBoxGuestCommonIOCtl+0x242/0x1aa0 [vboxguest]
 [<ffffffff8115aeb1>] ? handle_mm_fault+0x291/0x660
 [<ffffffffa00657d0>] vboxguestLinuxIOCtl+0xa0/0x1f0 [vboxguest]
 [<ffffffff81649b84>] ? __do_page_fault+0x1f4/0x510
 [<ffffffff811ab175>] do_vfs_ioctl+0x305/0x520
 [<ffffffff8129463e>] ? file_has_perm+0x8e/0xa0
 [<ffffffff811ab411>] sys_ioctl+0x81/0xa0
 [<ffffffff8164e3d9>] system_call_fastpath+0x16/0x1b
Code: 05 00 00 c7 05 f8 f5 01 00 00 00 00 00 5d c3 66 0f 1f 44 00 00 0f 1f 44 00 00 48 8b 47 10 55 48 89 e5 48 85 c0 74 0c 48 8b 57 18 <48> 89 50 18 48 8b 47 10 48 8b 57 18 48 85 d2 74 19 48 89 42 10 
RIP  [<ffffffffa006af86>] vbglPhysHeapExcludeBlock+0x16/0x60 [vboxguest]
 RSP <ffff88005c8e1b70>