efi sysfs oops

[   18.004221] ------------[ cut here ]------------
[   18.004226] WARNING: at fs/sysfs/dir.c:536 sysfs_add_one+0xb5/0xd0()
[   18.004228] Hardware name: System Product Name
[   18.004230] sysfs: cannot create duplicate filename '/firmware/efi/vars/dump-
type2-0-0-1366206034-cfc8fc79-be2e-4ddc-97f0-9f98bfe298a0'
[   18.004232] Modules linked in:
[   18.004235] Pid: 1, comm: swapper/0 Tainted: G        W    3.8.8-std-def-alt1
 #1
[   18.004237] Call Trace:
[   18.004242]  [<ffffffff811ffb65>] ? sysfs_add_one+0xb5/0xd0
[   18.004247]  [<ffffffff81057ffa>] warn_slowpath_common+0x7a/0xb0
[   18.004252]  [<ffffffff810580d1>] warn_slowpath_fmt+0x41/0x50
[   18.004257]  [<ffffffff8129d655>] ? strlcat+0x65/0x90
[   18.004262]  [<ffffffff811ffb65>] sysfs_add_one+0xb5/0xd0
[   18.004266]  [<ffffffff811ffd63>] create_dir+0x73/0xc0
[   18.004271]  [<ffffffff81200095>] sysfs_create_dir+0x85/0xe0
[   18.004278]  [<ffffffff8129759a>] kobject_add_internal+0xba/0x230
[   18.004284]  [<ffffffff812979f3>] kobject_init_and_add+0x63/0x90
[   18.004291]  [<ffffffff813eb533>] efivar_create_sysfs_entry+0x113/0x1e0
[   18.004297]  [<ffffffff813ebd5f>] efi_pstore_write+0x1af/0x1f0
[   18.004303]  [<ffffffff81207e5f>] pstore_console_write+0xff/0x130
[   18.004309]  [<ffffffff81058c01>] call_console_drivers.constprop.17+0x91/0x12
0
[   18.004314]  [<ffffffff81059efd>] console_unlock+0x42d/0x480
[   18.004320]  [<ffffffff8105a902>] register_console+0x192/0x3b0
[   18.004324]  [<ffffffff81208301>] pstore_register+0xd1/0x1b0
[   18.004330]  [<ffffffff813ebacc>] register_efivars+0x4cc/0x5b0
[   18.004336]  [<ffffffff817fd56e>] ? dmi_scan_machine+0x135/0x135
[   18.004341]  [<ffffffff817fd627>] efivars_init+0xb9/0x106
[   18.004346]  [<ffffffff81002172>] do_one_initcall+0x132/0x1a0
[   18.004352]  [<ffffffff817c5dd4>] kernel_init_freeable+0x15b/0x1e5
[   18.004357]  [<ffffffff817c5659>] ? do_early_param+0x8d/0x8d
[   18.004363]  [<ffffffff814c6d00>] ? rest_init+0x90/0x90
[   18.004369]  [<ffffffff814c6d09>] kernel_init+0x9/0xf0
[   18.004374]  [<ffffffff814e903c>] ret_from_fork+0x7c/0xb0
[   18.004380]  [<ffffffff814c6d00>] ? rest_init+0x90/0x90
[   18.004383] ---[ end trace 6296541291d2a226 ]---