[Xen-users] BUG: soft lockup - CPU#7 stuck for 61s! [udisks-dm-expor:11772]

[<s3t@xxxxxxxxxx>]

what does it mean? i never seen that before
xen4 on debian squeeze 2.6.32-5-xen-amd64

[22077.208077] BUG: soft lockup - CPU#7 stuck for 61s! [udisks-dm-expor:11772]
[22077.208139] Modules linked in: ext4 jbd2 crc16 xfs exportfs xt_tcpudp 
nf_conntrack_ipv4 nf_defrag_ipv4 xt_state nf_conntrack xt_physdev bridge stp 
ip6table_filter ip6_tables iptable_filter ip_tables x_tables xen_evtchn xenfs 
fuse loop snd_pcm snd_timer snd soundcore snd_page_alloc evdev joydev i2c_i801 
pcspkr psmouse i2c_core serio_raw ioatdma button processor acpi_processor ext3 
jbd mbcache dm_mod sd_mod crc_t10dif usbhid hid ata_generic uhci_hcd ata_piix 
ehci_hcd mpt2sas libata scsi_transport_sas usbcore nls_base scsi_mod igb dca 
thermal thermal_sys [last unloaded: scsi_wait_scan]
[22077.210311] CPU 7:
[22077.210391] Modules linked in: ext4 jbd2 crc16 xfs exportfs xt_tcpudp 
nf_conntrack_ipv4 nf_defrag_ipv4 xt_state nf_conntrack xt_physdev bridge stp 
ip6table_filter ip6_tables iptable_filter ip_tables x_tables xen_evtchn xenfs 
fuse loop snd_pcm snd_timer snd soundcore snd_page_alloc evdev joydev i2c_i801 
pcspkr psmouse i2c_core serio_raw ioatdma button processor acpi_processor ext3 
jbd mbcache dm_mod sd_mod crc_t10dif usbhid hid ata_generic uhci_hcd ata_piix 
ehci_hcd mpt2sas libata scsi_transport_sas usbcore nls_base scsi_mod igb dca 
thermal thermal_sys [last unloaded: scsi_wait_scan]
[22077.212560] Pid: 11772, comm: udisks-dm-expor Tainted: G      D    
2.6.32-5-xen-amd64 #1 B8DT6
[22077.212637] RIP: e030:[<ffffffff8130beb2>]  [<ffffffff8130beb2>] 
_spin_lock+0xf/0x1b
[22077.212748] RSP: e02b:ffff88010df0fb10  EFLAGS: 00000297
[22077.212804] RAX: 0000000000000027 RBX: ffff88010df0fb28 RCX: ffff88010df0fb68
[22077.212863] RDX: 0000000000000026 RSI: 0000000000000200 RDI: ffff8801ecf16600
[22077.212922] RBP: 0000000000000200 R08: 0000000000000008 R09: ffffffff814e95f0
[22077.212981] R10: 000000000000000b R11: ffff8801ecc12d80 R12: ffff8801ecf16580
[22077.213040] R13: 000000000000c580 R14: ffff88010df0fb28 R15: ffffffff814e95b0
[22077.213102] FS:  00007fef9c4607a0(0000) GS:ffff88000aac9000(0000) 
knlGS:0000000000000000
[22077.213178] CS:  e033 DS: 0000 ES: 0000 CR0: 000000008005003b
[22077.213234] CR2: 00007fda18005018 CR3: 0000000001001000 CR4: 0000000000002660
[22077.213294] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[22077.213353] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
[22077.213412] Call Trace:
[22077.213466]  [<ffffffff8100dcff>] ? xen_exit_mmap+0xf8/0x136
[22077.213524]  [<ffffffff8100922a>] ? hypercall_page+0x22a/0x1001
[22077.213583]  [<ffffffff810d1000>] ? exit_mmap+0x5a/0x148
[22077.213641]  [<ffffffff8104b6f1>] ? __cond_resched+0x1d/0x26
[22077.213698]  [<ffffffff8104c9e9>] ? mmput+0x3c/0xdf
[22077.213754]  [<ffffffff810505c6>] ? exit_mm+0x102/0x10d
[22077.213812]  [<ffffffff8100ec19>] ? xen_irq_enable_direct_end+0x0/0x7
[22077.213871]  [<ffffffff81051fc0>] ? do_exit+0x1e7/0x6b5
[22077.213928]  [<ffffffff8100ec5f>] ? xen_restore_fl_direct_end+0x0/0x1
[22077.213987]  [<ffffffff8130beda>] ? _spin_unlock_irqrestore+0xd/0xe
[22077.214046]  [<ffffffff8104f2a5>] ? release_console_sem+0x17e/0x1af
[22077.214105]  [<ffffffff8130beda>] ? _spin_unlock_irqrestore+0xd/0xe
[22077.214164]  [<ffffffff8130cd7d>] ? oops_end+0xaf/0xb4
[22077.214222]  [<ffffffff810135f0>] ? do_invalid_op+0x8b/0x95
[22077.214279]  [<ffffffff8100c60c>] ? pin_pagetable_pfn+0x2d/0x36
[22077.214338]  [<ffffffff810bacff>] ? __alloc_pages_nodemask+0x11c/0x5f5
[22077.214397]  [<ffffffff8101293b>] ? invalid_op+0x1b/0x20
[22077.214454]  [<ffffffff8100c60c>] ? pin_pagetable_pfn+0x2d/0x36
[22077.214513]  [<ffffffff8100c608>] ? pin_pagetable_pfn+0x29/0x36
[22077.214570]  [<ffffffff810cd2da>] ? __pte_alloc+0x6b/0xc6
[22077.214628]  [<ffffffff810cb18c>] ? pmd_alloc+0x28/0x5b
[22077.214685]  [<ffffffff810cd403>] ? handle_mm_fault+0xce/0x80f
[22077.214743]  [<ffffffff8102ddac>] ? pvclock_clocksource_read+0x3a/0x8b
[22077.214803]  [<ffffffff8130e3b6>] ? do_page_fault+0x2e0/0x2fc
[22077.214861]  [<ffffffff8130c255>] ? page_fault+0x25/0x30




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