Here is a backtrace related to this problem, in case it helps:

[863910.147108] Clocksource tsc unstable (delta = -811538859723 ns)
[863910.149479] BUG: soft lockup - CPU#2 stuck for 32768s! [swapper:0]
[863910.149479] Modules linked in: hmac sha1_generic ipmi_devintf drbd 
lru_cache cn xen_evtchn xenfs ip6t_REJECT ipt_REJECT ip6t_LOG ipt_LOG 
xt_multiport xt_tcpudp xt_comment ip6table_filter ip6_tables iptable_filter 
ip_tables x_tables bridge bonding 8021q garp stp loop snd_pcm snd_timer radeon 
ttm snd drm_kms_helper soundcore drm snd_page_alloc i5000_edac psmouse 
i2c_algo_bit hpilo pcspkr ipmi_si edac_core evdev ipmi_msghandler rng_core 
serio_raw i2c_core i5k_amb hpwdt container shpchp pci_hotplug processor 
acpi_processor button ext3 jbd mbcache dm_mod usbhid hid sg sr_mod cdrom 
ata_generic uhci_hcd ata_piix ehci_hcd libata usbcore nls_base bnx2 hpsa cciss 
scsi_mod thermal thermal_sys [last unloaded: scsi_wait_scan]
[863910.149479] CPU 2:
[863910.149479] Modules linked in: hmac sha1_generic ipmi_devintf drbd 
lru_cache cn xen_evtchn xenfs ip6t_REJECT ipt_REJECT ip6t_LOG ipt_LOG 
xt_multiport xt_tcpudp xt_comment ip6table_filter ip6_tables iptable_filter 
ip_tables x_tables bridge bonding 8021q garp stp loop snd_pcm snd_timer radeon 
ttm snd drm_kms_helper soundcore drm snd_page_alloc i5000_edac psmouse 
i2c_algo_bit hpilo pcspkr ipmi_si edac_core evdev ipmi_msghandler rng_core 
serio_raw i2c_core i5k_amb hpwdt container shpchp pci_hotplug processor 
acpi_processor button ext3 jbd mbcache dm_mod usbhid hid sg sr_mod cdrom 
ata_generic uhci_hcd ata_piix ehci_hcd libata usbcore nls_base bnx2 hpsa cciss 
scsi_mod thermal thermal_sys [last unloaded: scsi_wait_scan]
[863910.149479] Pid: 0, comm: swapper Not tainted 2.6.32-5-xen-amd64 #1 
ProLiant DL360 G5
[863910.149479] RIP: e030:[<ffffffff8100922a>]  [<ffffffff8100922a>] 
hypercall_page+0x22a/0x1001
[863910.149479] RSP: e02b:ffff8800034f4de8  EFLAGS: 00000246
[863910.149479] RAX: 0000000000040000 RBX: ffff8800034f4ea0 RCX: 
ffffffff8100922a
[863910.149479] RDX: ffff8800034f4ea0 RSI: 0000000000000000 RDI: 
0000000000000000
[863910.149479] RBP: ffff88001fd88000 R08: 00000000000000d9 R09: 
00000000000000fa
[863910.149479] R10: ffff88001fd59fd8 R11: 0000000000000246 R12: 
ffff8800023128f8
[863910.149479] R13: ffffffff812cda42 R14: 0000000000000100 R15: 
ffff88001fd59fd8
[863910.149479] FS:  00007f75890ff700(0000) GS:ffff8800034f1000(0000) 
knlGS:0000000000000000
[863910.149479] CS:  e033 DS: 002b ES: 002b CR0: 000000008005003b
[863910.149479] CR2: 00007f7588cb45f0 CR3: 0000000001001000 CR4: 
0000000000002660
[863910.149479] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 
0000000000000000
[863910.149479] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 
0000000000000400
[863910.149479] Call Trace:
[863910.149479]  <IRQ>  [<ffffffff8100e635>] ? xen_force_evtchn_callback+0x9/0xa
[863910.149479]  [<ffffffff8100ecf2>] ? check_events+0x12/0x20
[863910.149479]  [<ffffffff8100ec99>] ? xen_irq_enable_direct_end+0x0/0x7
[863910.149479]  [<ffffffff8105b6e0>] ? run_timer_softirq+0x196/0x268
[863910.149479]  [<ffffffff81054dbf>] ? __do_softirq+0xdd/0x1a6
[863910.149479]  [<ffffffff811f2b93>] ? __xen_evtchn_do_upcall+0x245/0x28d
[863910.149479]  [<ffffffff81012cac>] ? call_softirq+0x1c/0x30
[863910.149479]  [<ffffffff8101422b>] ? do_softirq+0x3f/0x7c
[863910.149479]  [<ffffffff81054c2f>] ? irq_exit+0x36/0x76
[863910.149479]  [<ffffffff811f3384>] ? xen_evtchn_do_upcall+0x33/0x42
[863910.149479]  [<ffffffff81012cfe>] ? xen_do_hypervisor_callback+0x1e/0x30
[863910.149479]  <EOI>  [<ffffffff810093aa>] ? hypercall_page+0x3aa/0x1001
[863910.149479]  [<ffffffff810093aa>] ? hypercall_page+0x3aa/0x1001
[863910.149479]  [<ffffffff8100e6b3>] ? xen_safe_halt+0xc/0x15
[863910.149479]  [<ffffffff8100bfc7>] ? xen_idle+0x37/0x40
[863910.149479]  [<ffffffff81010e97>] ? cpu_idle+0xa2/0xda
[863910.149479]  [<ffffffff8100ec99>] ? xen_irq_enable_direct_end+0x0/0x7
[863910.149479]  [<ffffffff81302947>] ? cpu_bringup+0x6d/0x72

-- 
Valentin


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