Description of problem:

Hi,

After I updated the kernel, the Firefox begun the fail.
I don't know whether whom crashes firstly is the kernel or Firefox

After I upgrade kernel, the Firefox 

Version-Release number of selected component (if applicable):

kernel-3.12.7-300.fc20.x86_64
kernel-modules-extra-3.12.7-300.fc20.x86_64
xen-hypervisor-4.3.1-6.fc20.x86_64
xen-libs-4.3.1-6.fc20.x86_64
xen-4.3.1-6.fc20.x86_64
xen-licenses-4.3.1-6.fc20.x86_64
xen-runtime-4.3.1-6.fc20.x86_64

firefox-26.0-3.fc20.x86_64


How reproducible:


Steps to Reproduce:
1.
2.
3.

Actual results:

Jan 16 14:57:44 barney kernel: [ 1285.019916] ------------[ cut here ]------------
Jan 16 14:57:44 barney kernel: [ 1285.020967] kernel BUG at include/linux/mm.h:421!
Jan 16 14:57:44 barney kernel: [ 1285.022012] invalid opcode: 0000 [#1] SMP 
Jan 16 14:57:44 barney kernel: [ 1285.022963] Modules linked in: bnep bluetooth rfkill arc4 md4 nls_utf8 cifs dns_resolver fscache bridge stp llc snd_hda_codec_hdmi snd_hda_codec_realtek snd_hda_intel joydev usb_storage snd_hda_codec snd_hwdep snd_seq snd_seq_device snd_pcm snd_page_alloc snd_timer snd iTCO_wdt 8139too 8139cp iTCO_vendor_support gpio_ich mii e1000e ppdev coretemp mei_me mei lpc_ich ptp parport_pc pps_core crc32c_intel serio_raw microcode video soundcore parport shpchp i2c_i801 mfd_core xen_acpi_processor xen_netback xen_blkback xen_gntdev nfsd auth_rpcgss nfs_acl lockd xen_evtchn sunrpc xenfs xen_privcmd radeon i2c_algo_bit drm_kms_helper ttm drm ata_generic i2c_core pata_acpi
Jan 16 14:57:44 barney kernel: [ 1285.037639] CPU: 0 PID: 1807 Comm: firefox Not tainted 3.12.7-300.fc20.x86_64 #1
Jan 16 14:57:44 barney kernel: [ 1285.039293] Hardware name:                  /DH55TC, BIOS TCIBX10H.86A.0048.2011.1206.1342 12/06/2011
Jan 16 14:57:44 barney kernel: [ 1285.040960] task: ffff8800b974a940 ti: ffff8803ebb56000 task.ti: ffff8803ebb56000
Jan 16 14:57:44 barney kernel: [ 1285.042066] RIP: e030:[<ffffffff8166522d>]  [<ffffffff8166522d>] get_page.part.35+0x4/0x6
Jan 16 14:57:44 barney kernel: [ 1285.043318] RSP: e02b:ffff8803ebb57d28  EFLAGS: 00010246
Jan 16 14:57:44 barney kernel: [ 1285.044105] RAX: 0000000000000000 RBX: ffffea00019f3c80 RCX: 00000000019f3c80
Jan 16 14:57:44 barney kernel: [ 1285.045185] RDX: 00000003c513a165 RSI: 00007fb21cdaa438 RDI: 00000003c513a165
Jan 16 14:57:44 barney kernel: [ 1285.046230] RBP: ffff8803ebb57d28 R08: ffff8803ee0e6f18 R09: ffffea000f8c7770
Jan 16 14:57:44 barney kernel: [ 1285.047307] R10: 0000000000000000 R11: 00000003c513a165 R12: ffff8803ee0e6f18
Jan 16 14:57:44 barney kernel: [ 1285.048385] R13: 00007fb21cdaa438 R14: ffffea000f8c7770 R15: ffff88040841d730
Jan 16 14:57:44 barney kernel: [ 1285.049431] FS:  00007fb22d767780(0000) GS:ffff880426800000(0000) knlGS:0000000000000000
Jan 16 14:57:44 barney kernel: [ 1285.050636] CS:  e033 DS: 0000 ES: 0000 CR0: 000000008005003b
Jan 16 14:57:44 barney kernel: [ 1285.051477] CR2: 00007fb21cdaa438 CR3: 00000000bd8e6000 CR4: 0000000000002660
Jan 16 14:57:44 barney kernel: [ 1285.052569] Stack:
Jan 16 14:57:44 barney kernel: [ 1285.052860]  ffff8803ebb57da8 ffffffff8116a4a2 00007fb21cdaa438 ffff8803ee0e6f18
Jan 16 14:57:44 barney kernel: [ 1285.054021]  0000000000000101 ffff8803e31ddd50 ffff8803eb86b400 ffff8803ebb57e38
Jan 16 14:57:44 barney kernel: [ 1285.055193]  ffffffff810051c9 00000003c513a165 0000000000000000 00007fb21cdaa438
Jan 16 14:57:44 barney kernel: [ 1285.056355] Call Trace:
Jan 16 14:57:44 barney kernel: [ 1285.056706]  [<ffffffff8116a4a2>] do_wp_page+0x682/0x810
Jan 16 14:57:44 barney kernel: [ 1285.057506]  [<ffffffff810051c9>] ? __raw_callee_save_xen_pmd_val+0x11/0x1e
Jan 16 14:57:44 barney kernel: [ 1285.058570]  [<ffffffff8116c8b8>] handle_mm_fault+0x918/0x1110
Jan 16 14:57:44 barney kernel: [ 1285.059423]  [<ffffffff81671f98>] __do_page_fault+0x158/0x540
Jan 16 14:57:44 barney kernel: [ 1285.060278]  [<ffffffff81175051>] ? mprotect_fixup+0x151/0x290
Jan 16 14:57:44 barney kernel: [ 1285.061169]  [<ffffffff8167238e>] do_page_fault+0xe/0x10
Jan 16 14:57:44 barney kernel: [ 1285.061952]  [<ffffffff8166ead8>] page_fault+0x28/0x30
Jan 16 14:57:44 barney kernel: [ 1285.062705] Code: 74 0c 4c 89 e0 48 c1 e0 06 48 29 d8 eb 02 31 c0 5b 41 5c 5d c3 55 48 89 e5 0f 0b 55 48 89 e5 0f 0b 55 48 89 e5 0f 0b 55 48 89 e5 <0f> 0b 55 48 89 e5 0f 0b 55 48 89 e5 0f 0b 55 48 89 e5 0f 0b 55 
Jan 16 14:57:44 barney kernel: [ 1285.066409] RIP  [<ffffffff8166522d>] get_page.part.35+0x4/0x6
Jan 16 14:57:44 barney kernel: [ 1285.067319]  RSP <ffff8803ebb57d28>
Jan 16 14:57:44 barney kernel: [ 1285.282332] ---[ end trace 7992c69b3abfca55 ]---


Expected results:


Additional info: