[Xen-devel] Window VM hit blue screen when dom0 uses ext4 with extent enabled

[MaoXiaoyun <tinnycloud@xxxxxxxxxxx>]

Hi:
 
   We met quite strange blue screen problem when recently shift our dom0 fs from ext3 to
ext4.  We have some IO stress test, that is in a Win2003 HVM, a process perform file reading
and  writing after the VM startup. In our dom0 host, we start totally 10 HVMS to run the test.
 
Here is the test result
1) if it is ext3 in dom0,  test is ok
2) if it is ext4 in dom0,  entent feature is disabled, test is ok.
3) if it is ext4 in dom0,  and extent feature is enable, HVMs will got blue screen one after another
in 15 -30 minutes.  And the blue screen code implys something wrong with the disk.
(Such as KERNEL_STACK_INPAGE_ERROR,
STOP 0x00000077(0x00000185,0x00000185,0x00000000,0x001FD000))
 
Also serial port has some log report:
(XEN) grant_table.c:578:d0 Iomem mapping not permitted ffffffffffffffff (domain 40)
(XEN) grant_table.c:578:d0 Iomem mapping not permitted ffffffffffffffff (domain 40)
 
   When blue screen, I don't see any abnormal log in messages.   It's surprise me since
wi/wo extent make such big difference.  We've been run VMs in ext3 quite a long time
with no failure, I also learnt that extent is a important feature in ext4, couldn't be wrong
so easily. 
 
So what's problem could it be ?
Any comments?
Thanks.
 
BTW: we have kernel 2.6.32.36 + xen 4.0.1

 

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