I've built 3.7.0-rc8 and have been running it for about 40 minutes.
I was inspecting the output from dmesg whilst trying to figure out why 
the command "alsactl restore" is producing an error and spotted this 
kernel warning.

[  241.982633] ------------[ cut here ]------------
[  241.982642] WARNING: at arch/x86/kernel/apic/ipi.c:109 
default_send_IPI_mask_logical+0xa6/0xd0()
[  241.982643] Hardware name: LIFEBOOK AH531
[  241.982645] empty IPI mask
[  241.982646] Modules linked in:
[  241.982647]  iptable_filter xt_conntrack ipt_MASQUERADE iptable_nat 
nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 nf_nat nf_conntrack 
snd_usb_audio snd_usbmidi_lib usb_storage snd_hwdep snd_rawmidi 
snd_seq_device coretemp snd_hda_codec_hdmi hwmon snd_hda_codec_realtek 
fujitsu_laptop kvm_intel snd_hda_intel snd_hda_codec r8169 kvm [last 
unloaded: microcode]
[  241.982667] Pid: 692, comm: HTML5 Parser Not tainted 3.7.0-rc8 #77
[  241.982668] Call Trace:
[  241.982672]  [<c102f218>] ? warn_slowpath_common+0x78/0xb0
[  241.982674]  [<c1021376>] ? default_send_IPI_mask_logical+0xa6/0xd0
[  241.982676]  [<c1021376>] ? default_send_IPI_mask_logical+0xa6/0xd0
[  241.982678]  [<c102f2e3>] ? warn_slowpath_fmt+0x33/0x40
[  241.982680]  [<c1021376>] ? default_send_IPI_mask_logical+0xa6/0xd0
[  241.982683]  [<c101f60f>] ? native_send_call_func_ipi+0x3f/0x60
[  241.982688]  [<c1072be8>] ? smp_call_function_many+0x178/0x220
[  241.982690]  [<c102bc30>] ? do_flush_tlb_all+0x60/0x60
[  241.982692]  [<c102bcd8>] ? native_flush_tlb_others+0x28/0x30
[  241.982694]  [<c102bfe2>] ? flush_tlb_page+0x82/0xd0
[  241.982695]  [<c102ad41>] ? ptep_set_access_flags+0x61/0x70
[  241.982698]  [<c10ad6ea>] ? do_wp_page+0x34a/0x7f0
[  241.982701]  [<c10aefbd>] ? handle_pte_fault+0x49d/0x870
[  241.982704]  [<c106fd08>] ? futex_wake+0xf8/0x120
[  241.982706]  [<c1071397>] ? do_futex+0xf7/0x9f0
[  241.982708]  [<c10b012a>] ? handle_mm_fault+0xda/0x140
[  241.982711]  [<c1026fa1>] ? __do_page_fault+0x141/0x460
[  241.982713]  [<c106653a>] ? ktime_get_ts+0x3a/0x150
[  241.982715]  [<c107304a>] ? 
generic_smp_call_function_interrupt+0xca/0x160
[  241.982717]  [<c10272d0>] ? vmalloc_sync_all+0x10/0x10
[  241.982721]  [<c13f34e6>] ? error_code+0x5a/0x60
[  241.982723]  [<c10272d0>] ? vmalloc_sync_all+0x10/0x10
[  241.982725] ---[ end trace a26e371ca3a2122a ]---

My .config is attached.

Let me know if I can provide additional diagnostics or help testing any 
patches, but please cc me as I'm not subscribed.

Chris