I am also experiencing this problem on a domU with kernel 2.6.22-14-xen
with xen 3.10

Does a newer kernel resolve the issue ?

Kernel Backtrace:
[1640817.442940] BUG: unable to handle kernel NULL pointer dereference at 
virtual address 00000108
[1640817.442953]  printing eip:                                                 
                  
[1640817.442958] 0f9fd000 -> *pde = 00000000:2d376001                           
                  
[1640817.442962] 0aaa2000 -> *pme = 00000000:00000000                           
                  
[1640817.442966] Oops: 0000 [#1]                                                
                  
[1640817.442968] SMP                                                            
                  
[1640817.442972] Modules linked in: evdev 8250 serial_core ext3 jbd mbcache 
fuse                  
[1640817.442985] CPU:    0                                                      
                  
[1640817.442985] EIP:    0061:[<d11268c9>]    Not tainted VLI                   
                  
[1640817.442986] EFLAGS: 00010286   (2.6.22-14-xen #1)                          
                  
[1640817.442999] EIP is at walk_page_buffers+0x19/0x70 [ext3]                   
                  
[1640817.443002] eax: 00000000   ebx: 00000000   ecx: 00000000   edx: 00000104  
                  
[1640817.443006] esi: 00000104   edi: c0437178   ebp: 00000000   esp: cf253e04  
                  
[1640817.443009] ds: 007b   es: 007b   fs: 00d8  gs: 0000  ss: 0069             
                  
[1640817.443013] Process pdflush (pid: 60, ti=cf252000 task=cf3a6a60 
task.ti=cf252000)            
[1640817.443017] Stack: 00000000 cacc5210 c1728b60 c0437178 cacc5210 cacc5210 
d1129ad1 00001000   
[1640817.443028]        00000000 d1126920 00000000 c1728b60 cf253f70 c9e2913c 
00000002 cf253f70   
[1640817.443039]        00000000 c0157a58 c1728b60 c0157f14 00000000 0000000e 
c0157a50 c9e2913c   
[1640817.443050] Call Trace:                                                    
                  
[1640817.443053]  [<d1129ad1>] ext3_ordered_writepage+0xe1/0x1a0 [ext3]         
                  
[1640817.443063]  [<d1126920>] bget_one+0x0/0x10 [ext3]                         
                  
[1640817.443070]  [<c0157a58>] __writepage+0x8/0x30                             
                  
[1640817.443076]  [<c0157f14>] write_cache_pages+0x214/0x310                    
                  
[1640817.443081]  [<c0157a50>] __writepage+0x0/0x30                             
                  
[1640817.443086]  [<c02ff2f6>] schedule+0x356/0x900                             
                  
[1640817.443092]  [<c0158030>] generic_writepages+0x20/0x30                     
                  
[1640817.443096]  [<c0158089>] do_writepages+0x49/0x50                          
                  
[1640817.443101]  [<c0198153>] __writeback_single_inode+0x93/0x3c0              
                  
[1640817.443106]  [<c0300193>] schedule_timeout+0x53/0xd0                       
                  
[1640817.443111]  [<c02ff2f6>] schedule+0x356/0x900                             
                  
[1640817.443115]  [<c019880e>] sync_sb_inodes+0x17e/0x240                       
                  
[1640817.443120]  [<c0198cd9>] writeback_inodes+0x99/0xd0                       
                  
[1640817.443125]  [<c0158735>] wb_kupdate+0x85/0xf0                             
                  
[1640817.443130]  [<c0158ad0>] pdflush+0x0/0x260                                
                  
[1640817.443134]  [<c0158c18>] pdflush+0x148/0x260                              
                  
[1640817.443138]  [<c01586b0>] wb_kupdate+0x0/0xf0                              
                  
[1640817.443142]  [<c0136312>] kthread+0x42/0x70                                
                  
[1640817.443147]  [<c01362d0>] kthread+0x0/0x70                                 
                  
[1640817.443151]  [<c0105927>] kernel_thread_helper+0x7/0x10                    
                  
[1640817.443156]  =======================                                       
                  
[1640817.443159] Code: 74 f0 31 c0 39 cb 5b 0f 92 c0 c3 8d b4 26 00 00 00 00 55 
57 89 d7 56 53 83 ec 08 89 0c 24 31 c9 89 44 24 04 8b 6a 14 8d 5c 0d 00 <8b> 72 
04 3b 1c 24 76 2f 89 d8 29 e8 3b 44 24 1c 73 25 8b 44 24                        
                                                                        
[1640817.443211] EIP: [<d11268c9>] walk_page_buffers+0x19/0x70 [ext3] SS:ESP 
0069:cf253e04

-- 
Kernel BUG: unable to handle kernel NULL pointer dereference at virtual address 
00000108
https://bugs.launchpad.net/bugs/236059
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