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Panic and restart of the XEN server 6.0.2

Aditya Malviya


Dear Forum Members,


We are frequently getting the crash situation at our customer locations which leads to the abrupt restart of the servers.


Setup : XenServer 6.0.2


[2018-09-10 00:44:11] (XEN) 00000000d7fefca0 0000000000000000 0000000000000000 0000000000000000 
[2018-09-10 00:44:11] (XEN) 0000000000000000 ffff82c48022a524 0000000000000000 0000000000000000 
[2018-09-10 00:44:11] (XEN) 0000000000000000 0000000000000000 00000000d7fefca0 0000000000000005 
[2018-09-10 00:44:11] (XEN) Xen call trace: 
[2018-09-10 00:44:11] (XEN) [<ffff82c4801eb118>] mtc_paging_mark_dirty+0x1c8/0xfc0 
[2018-09-10 00:44:11] (XEN) [<ffff82c48010c713>] gnttab_copy+0x843/0x9d0 
[2018-09-10 00:44:11] (XEN) [<ffff82c480110042>] compat_grant_table_op+0x902/0xe40 
[2018-09-10 00:44:11] (XEN) [<ffff82c4801266a4>] timer_softirq_action+0x154/0x220 
[2018-09-10 00:44:11] (XEN) [<ffff82c48022a524>] compat_hypercall+0x74/0x80 
[2018-09-10 00:44:11] (XEN) 
[2018-09-10 00:44:11] (XEN) Pagetable walk from ffff82fffffff000: 
[2018-09-10 00:44:11] (XEN) L4[0x105] = 00000000bdac2027 5555555555555555 
[2018-09-10 00:44:11] (XEN) L3[0x1ff] = 0000000000000000 ffffffffffffffff 
[2018-09-10 00:44:11] (XEN) 
[2018-09-10 00:44:11] (XEN) **************************************** 
[2018-09-10 00:44:11] (XEN) Panic on CPU 0: 
[2018-09-10 00:44:11] (XEN) FATAL PAGE FAULT 
[2018-09-10 00:44:11] (XEN) [error_code=0000] 
[2018-09-10 00:44:11] (XEN) Faulting linear address: ffff82fffffff000 
[2018-09-10 00:44:11] (XEN) **************************************** 
[2018-09-10 00:44:11] (XEN) 
[2018-09-10 00:44:11] (XEN) Reboot in five seconds... 


Is it a known situation for the citrix. Does citrix have any solution for this ?





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Page faults are usually due to bad (faulty) memory, which results in serious errors; if you can, do a full POST and set your BIOS to check all your memory. If you can identify the bad module. replace it.

It looks to me that it has nothing to do with XS, itself. That said, please consider upgrading XS to a newer, more secure version.



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6.0.2 is completely unsupported, its going to be difficult to find any resolution if its software related

at this point. Be sure you have good backups of your VM's and if you think your hardware can 

support 7.x then upgrade. 7.1 LTSR if you are going to license or 8.0 if you are going to run free and

upgrade on demand as each new version is released. You probably should consider a hardware 

refresh as well. 





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