Description of problem:
1) Run a F19 VM with virt-manager-0.9.5-1.fc18.noarch on a fully updated F18 host
2) Click on a URI in sylpheed-3.3.0-1.fc18.x86_64, it should open firefox-21.0-3.fc18.x86_64 
3) Firefox doesn't open, got kerneloops instead

Additional info:
reporter:       libreport-2.1.4
BUG: unable to handle kernel paging request at 00000033174ee000
IP: [<ffffffff811876d8>] kmem_cache_alloc+0x68/0x200
PGD 11a142067 PUD 12dff3067 PMD 12e88b067 PTE 0
Oops: 0000 [#1] SMP 
Modules linked in: vfat fat usb_storage ebtable_nat xt_CHECKSUM bridge stp llc fuse ipt_MASQUERADE nf_conntrack_netbios_ns nf_conntrack_broadcast ip6table_mangle ip6t_REJECT nf_conntrack_ipv6 nf_defrag_ipv6 be2iscsi iptable_nat nf_nat_ipv4 nf_nat iscsi_boot_sysfs iptable_mangle bnx2i nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack nf_conntrack cnic uio cxgb4i ebtable_filter cxgb4 ebtables ip6table_filter cxgb3i ip6_tables cxgb3 mdio libcxgbi ib_iser rdma_cm ib_addr iw_cm ib_cm ib_sa ib_mad rfcomm ib_core iscsi_tcp libiscsi_tcp bnep libiscsi scsi_transport_iscsi snd_hda_codec_hdmi snd_hda_codec_conexant arc4 snd_hda_intel iwldvm snd_hda_codec snd_hwdep mac80211 snd_seq vhost_net iTCO_wdt acpi_cpufreq snd_seq_device snd_pcm uvcvideo snd_page_alloc snd_timer mperf e1000e videobuf2_vmalloc coretemp tun macvtap macvlan iTCO_vendor_support videobuf2_memops videobuf2_core btusb kvm_intel videodev bluetooth ptp iwlwifi cfg80211 media lpc_ich i2c_i801 mei thinkpad_acpi mfd_core kvm pps_core intel_ips snd soundcore rfkill microcode uinput dm_crypt crc32_pclmul crc32c_intel i915 ghash_clmulni_intel firewire_ohci sdhci_pci sdhci i2c_algo_bit firewire_core drm_kms_helper mmc_core drm crc_itu_t i2c_core mxm_wmi video wmi
CPU 2 
Pid: 28580, comm: sylpheed Not tainted 3.9.5-201.fc18.x86_64 #1 LENOVO 2537CT4/2537CT4
RIP: 0010:[<ffffffff811876d8>]  [<ffffffff811876d8>] kmem_cache_alloc+0x68/0x200
RSP: 0018:ffff88010ce59d30  EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffff880110175e00 RCX: 00000000000e3170
RDX: 00000000005ace8a RSI: 00000000000000d0 RDI: ffff880133401700
RBP: ffff88010ce59d80 R08: 0000000000016de0 R09: ffffffff8116ba0d
R10: 0000000000000003 R11: ffff88004ef2da10 R12: 00000033174ee000
R13: 00000000000000d0 R14: ffff880133401700 R15: ffff880133401700
FS:  00007fd5f2b869c0(0000) GS:ffff880137d00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
CR2: 00000033174ee000 CR3: 000000000a6cc000 CR4: 00000000000027e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Process sylpheed (pid: 28580, threadinfo ffff88010ce58000, task ffff88012e882ee0)
Stack:
 ffff88010ce59d80 ffffffff8116b8ef ffffffff8116ba0d ffff88010910ccb0
 ffff88010ce59d80 ffff880110175e00 ffff88010910cc38 ffff88004ef2d730
 0000000000000001 ffff88004ef2d730 ffff88010ce59db0 ffffffff8116ba0d
Call Trace:
 [<ffffffff8116b8ef>] ? anon_vma_clone+0x9f/0x140
 [<ffffffff8116ba0d>] ? anon_vma_fork+0x7d/0x100
 [<ffffffff8116ba0d>] anon_vma_fork+0x7d/0x100
 [<ffffffff8105c82d>] dup_mm+0x24d/0x640
 [<ffffffff8105d637>] copy_process.part.24+0x9d7/0x13e0
 [<ffffffff811bbdd2>] ? __alloc_fd+0x42/0x110
 [<ffffffff8105e139>] do_fork+0xa9/0x350
 [<ffffffff811bbed0>] ? get_unused_fd_flags+0x30/0x40
 [<ffffffff811bbf0e>] ? __fd_install+0x2e/0x60
 [<ffffffff8105e466>] sys_clone+0x16/0x20
 [<ffffffff8166a639>] stub_clone+0x69/0x90
 [<ffffffff8166a2d9>] ? system_call_fastpath+0x16/0x1b
Code: 90 4d 89 fe 4d 8b 06 65 4c 03 04 25 c8 db 00 00 49 8b 50 08 4d 8b 20 4d 85 e4 0f 84 1c 01 00 00 49 63 46 20 4d 8b 06 41 f6 c0 0f <49> 8b 1c 04 0f 85 46 01 00 00 48 8d 4a 01 4c 89 e0 65 49 0f c7 
RIP  [<ffffffff811876d8>] kmem_cache_alloc+0x68/0x200
 RSP <ffff88010ce59d30>
CR2: 00000033174ee000