soft lockup ftl

[   66.572527] BUG: soft lockup - CPU#1 stuck for 61s! [invoke-rc.d:1215]
[   66.572537] Modules linked in: ipv6 dahdi_transcode dahdi_dummy dahdi crc_ccitt
[   66.572541] 
[   66.572544] Pid: 1215, comm: invoke-rc.d Not tainted (2.6.31-302-ec2 #7-Ubuntu) 
[   66.572546] EIP: 0061:[<c0101227>] EFLAGS: 00000246 CPU: 1
[   66.572549] EIP is at 0xc0101227
[   66.572550] EAX: 00030004 EBX: deadbeef ECX: deadbeef EDX: f57fb000
[   66.572552] ESI: 00000003 EDI: d7aa2a20 EBP: d569bca4 ESP: d569bc9c
[   66.572554]  DS: 007b ES: 007b FS: 00d8 GS: 0000 SS: 0069
[   66.572559] CR0: 8005003b CR2: b7713f90 CR3: 159cb000 CR4: 00002660
[   66.572562] DR0: 00000000 DR1: 00000000 DR2: 00000000 DR3: 00000000
[   66.572564] DR6: ffff0ff0 DR7: 00000400
[   66.572565] Call Trace:
[   66.572572]  [<c03dddad>] ? force_evtchn_callback+0xd/0x10
[   66.572576]  [<c04c7885>] _spin_unlock_irqrestore+0x65/0x70
[   66.572583]  [<d7a88241>] dahdi_receive+0x961/0xad0 [dahdi]
[   66.572588]  [<d7a800d8>] ? dahdi_ec_chunk+0xd8/0x260 [dahdi]
[   66.572591]  [<d787d328>] dahdi_dummy_timer+0x98/0xf8 [dahdi_dummy]
[   66.572596]  [<c013b1da>] run_timer_softirq+0x13a/0x280
[   66.572598]  [<d787d290>] ? dahdi_dummy_timer+0x0/0xf8 [dahdi_dummy]
[   66.572601]  [<c0135a9c>] __do_softirq+0xac/0x1e0
[   66.572605]  [<c016f7b4>] ? handle_IRQ_event+0x64/0x180
[   66.572612]  [<c0135c55>] do_softirq+0x85/0x90
[   66.572619]  [<c0135d6d>] irq_exit+0x2d/0x40
[   66.572628]  [<c03de4c5>] evtchn_do_upcall+0x1c5/0x1f0
[   66.572631]  [<c01d1f28>] ? dput+0x88/0x160
[   66.572635]  [<c010483b>] hypervisor_callback+0x43/0x4b
[   66.572638]  [<c01a6f3c>] ? unmap_page_range+0x6c/0x200
[   66.572641]  [<c0389447>] ? prio_tree_insert+0x1f7/0x240
[   66.572644]  [<c0196b5e>] ? ____pagevec_lru_add+0x1de/0x220
[   66.572647]  [<c01a71dd>] unmap_vmas+0x10d/0x1c0
[   66.572649]  [<c01accbf>] unmap_region+0x8f/0x120
[   66.572652]  [<c01acf37>] do_munmap+0x1e7/0x2a0
[   66.572654]  [<c01ad4d4>] mmap_region+0xb4/0x410
[   66.572658]  [<c04252f8>] ? common_mmap+0x38/0x60
[   66.572661]  [<c01ada86>] do_mmap_pgoff+0x256/0x310
[   66.572664]  [<c01086ed>] sys_mmap2+0xad/0xc0
[   66.572666]  [<c0104625>] syscall_call+0x7/0xb