Hi,

Attempting to move back to mainline after my recent 2.6.32 issues...
Config is make oldconfig from working 2.6.32 config. Patch for 
af_packet.c (for skb issue found in 2.6.32) included. Attaching .config 
and NMI backtraces.

System becomes unusable after bringing up the network:

Jan  9 16:36:50 mail kernel: ------------[ cut here ]------------
Jan  9 16:36:50 mail kernel: WARNING: at lib/dma-debug.c:902 
check_sync+0xbd/0x426()
Jan  9 16:36:50 mail kernel: Hardware name: System Product Name
Jan  9 16:36:50 mail kernel: sky2 0000:04:00.0: DMA-API: device driver 
tries to sync DMA memory it has not allocated [device 
address=0x0000000311686822] [size=60 bytes]
Jan  9 16:36:50 mail kernel: Modules linked in: bridge stp appletalk 
psnap llc nfsd lockd nfs_acl auth_rpcgss exportfs hwmon_vid coretemp 
sunrpc acpi_cpufreq sit tunnel4 ipt_LOG ipt_MASQUERADE iptable_nat 
nf_nat iptable_mangle iptable_raw nf_conntrack_netbios_ns 
nf_conntrack_ftp nf_conntrack_ipv6 xt_multiport ip6table_filter xt_DSCP 
xt_dscp xt_MARK ip6table_mangle ip6_tables ipv6 dm_multipath kvm_intel 
kvm snd_hda_codec_analog snd_ens1371 gameport snd_rawmidi snd_ac97_codec 
snd_hda_intel ac97_bus snd_hda_codec snd_hwdep snd_seq gspca_spca505 
snd_seq_device gspca_main snd_pcm videodev snd_timer snd v4l1_compat 
v4l2_compat_ioctl32 firewire_ohci soundcore snd_page_alloc iTCO_wdt 
i2c_i801 iTCO_vendor_support firewire_core crc_itu_t sky2 pcspkr wmi 
asus_atk0110 hwmon fbcon tileblit font bitblit softcursor raid456 
async_raid6_recov async_pq raid6_pq async_xor xor async_memcpy async_tx 
raid1 ata_generic pata_acpi pata_marvell nouveau ttm drm_kms_helper drm 
agpgart fb i2c_algo_bit cfbcopyarea i2c_core cfbimgblt cfbfil
Jan  9 16:36:50 mail kernel: lrect [last unloaded: scsi_wait_scan]
Jan  9 16:36:50 mail kernel: Pid: 5271, comm: libvirtd Not tainted 
2.6.33-rc3WITHMMAPNODMAR-00147-g3c8ad49-dirty #1
Jan  9 16:36:50 mail kernel: Call Trace:
Jan  9 16:36:50 mail kernel: <IRQ>  [<ffffffff81049fe5>] 
warn_slowpath_common+0x7c/0x94
Jan  9 16:36:50 mail kernel: [<ffffffff8104a054>] 
warn_slowpath_fmt+0x41/0x43
Jan  9 16:36:50 mail kernel: [<ffffffff81261c0a>] check_sync+0xbd/0x426
Jan  9 16:36:50 mail kernel: [<ffffffff813b2aff>] ? 
__netdev_alloc_skb+0x34/0x50
Jan  9 16:36:50 mail kernel: [<ffffffff812622c6>] 
debug_dma_sync_single_for_cpu+0x42/0x44
Jan  9 16:36:50 mail kernel: [<ffffffff8125f6c7>] ? 
swiotlb_sync_single+0x2a/0xb6
Jan  9 16:36:50 mail kernel: [<ffffffff8125f823>] ? 
swiotlb_sync_single_for_cpu+0xc/0xe
Jan  9 16:36:50 mail kernel: [<ffffffffa018efcb>] sky2_poll+0x4d5/0xaf0 
[sky2]
Jan  9 16:36:50 mail kernel: [<ffffffff8106a1a3>] ? 
sched_clock_cpu+0x44/0xce
Jan  9 16:36:50 mail kernel: [<ffffffff81070573>] ? 
clockevents_program_event+0x7a/0x83
Jan  9 16:36:50 mail kernel: [<ffffffff813b9766>] net_rx_action+0xb5/0x1f0
Jan  9 16:36:50 mail kernel: [<ffffffff8105059c>] __do_softirq+0xf8/0x1cd
Jan  9 16:36:50 mail kernel: [<ffffffff8109389a>] ? 
handle_IRQ_event+0x119/0x12b
Jan  9 16:36:50 mail kernel: [<ffffffff8100ab1c>] call_softirq+0x1c/0x30
Jan  9 16:36:50 mail kernel: [<ffffffff8100c2b3>] do_softirq+0x4b/0xa3
Jan  9 16:36:50 mail kernel: [<ffffffff81050188>] irq_exit+0x4a/0x8c
Jan  9 16:36:50 mail kernel: [<ffffffff8145a83c>] do_IRQ+0xac/0xc3
Jan  9 16:36:50 mail kernel: [<ffffffff81455a93>] ret_from_intr+0x0/0x16
Jan  9 16:36:50 mail kernel: <EOI>  [<ffffffff8104474c>] ? 
set_cpus_allowed_ptr+0x22/0x14b
Jan  9 16:36:50 mail kernel: [<ffffffff81087aff>] 
cpuset_attach_task+0x27/0x9c
Jan  9 16:36:50 mail kernel: [<ffffffff81087bfe>] cpuset_attach+0x8a/0x133
Jan  9 16:36:50 mail kernel: [<ffffffff81042cba>] ? 
sched_move_task+0x104/0x110
Jan  9 16:36:50 mail kernel: [<ffffffff81085b4f>] 
cgroup_attach_task+0x4d5/0x533
Jan  9 16:36:50 mail kernel: [<ffffffff81085e05>] cgroup_clone+0x258/0x2ac
Jan  9 16:36:50 mail kernel: [<ffffffff81088a74>] ns_cgroup_clone+0x58/0x75
Jan  9 16:36:50 mail kernel: [<ffffffff81048ec1>] copy_process+0xcef/0x13af
Jan  9 16:36:50 mail kernel: [<ffffffff810d9044>] ? 
handle_mm_fault+0x355/0x7ff
Jan  9 16:36:50 mail kernel: [<ffffffff8108f769>] ? 
audit_filter_rules+0x19a/0x7c5
Jan  9 16:36:50 mail kernel: [<ffffffff810496ec>] do_fork+0x16b/0x309
Jan  9 16:36:50 mail kernel: [<ffffffff81251d12>] ? __up_read+0x82/0x8a
Jan  9 16:36:50 mail kernel: [<ffffffff81010f22>] sys_clone+0x28/0x2a
Jan  9 16:36:50 mail kernel: [<ffffffff81009f33>] stub_clone+0x13/0x20
Jan  9 16:36:50 mail kernel: [<ffffffff81009bf2>] ? 
system_call_fastpath+0x16/0x1b
Jan  9 16:36:50 mail kernel: ---[ end trace cd5e0588bad4ec83 ]---
Then... after a few more normal boot messages (samba starting up, etc.) 
I just see rcu stalls with NMI backtraces for each cpu. I've attached 
the first one - the rcu stall oops repeats until the reboot I forced.