Re: [Xen-devel] domU reboot failure

[Ewan Mellor <ewan@xxxxxxxxxxxxx>]

On Thu, Mar 22, 2007 at 03:59:20PM +0000, Al Stone wrote:

> On Wed, 2007-03-21 at 15:08 -0600, Alex Williamson wrote:
> >    FYI, latest unstable tip (14462) fails to reboot pv domains (issuing
> > reboot from within the domain).
> 
> I can recreate this with 'xm reboot' also -- and get the same
> exact errors.
> 
> >   Xend.log shows the following:
> > 
> > [2007-03-21 14:54:26 3097] DEBUG (__init__:1072) features       = 
> > [2007-03-21 14:54:26 3097] ERROR (__init__:1072) XendDomainInfo.initDomain: 
> > exception occurred
> > Traceback (most recent call last):
> >   File "//usr/lib64/python/xen/xend/XendDomainInfo.py", line 1499, in 
> > _initDomain
> >     channel_details = self.image.createImage()
> >   File "//usr/lib64/python/xen/xend/image.py", line 112, in createImage
> >     return self.createDomain()
> >   File "//usr/lib64/python/xen/xend/image.py", line 131, in createDomain
> >     result = self.buildDomain()
> >   File "//usr/lib64/python/xen/xend/image.py", line 611, in buildDomain
> >     return LinuxImageHandler.buildDomain(self)
> >   File "//usr/lib64/python/xen/xend/image.py", line 215, in buildDomain
> >     features       = self.vm.getFeatures())
> > Error: (11, 'Resource temporarily unavailable')
> > [2007-03-21 14:54:26 3097] ERROR (__init__:1072) VM start failed
> > ...
> > 
> > Seeing this both on ia64 and x86_64 (didn't test x86_32).  Domain was
> > started with 'xm create'.  The breakage seems to have occurred within
> > the last ~50 csets.  Thanks,
> 
> Digging through the logs some more, it looks like my domU
> is initially started with 800MB RAM as it should be:
> 
> ...
> [2007-03-21 17:42:00 4248] INFO (__init__:1072) buildDomain os=linux dom=9 
> vcpus=1
> [2007-03-21 17:42:00 4248] DEBUG (__init__:1072) domid          = 9
> [2007-03-21 17:42:00 4248] DEBUG (__init__:1072) memsize        = 800
> [2007-03-21 17:42:00 4248] DEBUG (__init__:1072) image          = 
> /boot/vmlinuz-2.6.18-xen
> ...
> 
> However, after the domU has shut down, it gets
> restarted by XenDomainInfo.create_from_dict, and for
> some reason I haven't figured out yet, memsize is
> now set to zero:
> 
> ...
> [2007-03-21 17:42:50 4248] INFO (__init__:1072) buildDomain os=linux dom=10 
> vcpus=1
> [2007-03-21 17:42:50 4248] DEBUG (__init__:1072) domid          = 10
> [2007-03-21 17:42:50 4248] DEBUG (__init__:1072) memsize        = 0
> [2007-03-21 17:42:50 4248] DEBUG (__init__:1072) image          = 
> /boot/vmlinuz-2.6.18-xen
> ...
> 
> This, of course, leads the domain builder to complain
> for obvious reasons:
> 
> ...
> xc_dom_mem_init: mem 0 MB, pages 0x0 pages, 16k each
> xc_dom_mem_init: 0x0 pages
> xc_dom_boot_mem_init: called
> arch_setup_meminit: doing nothing
> xc_dom_build_image: called
> xc_dom_alloc_segment:   kernel       : 0x4000000 -> 0x519c000  (pfn 0x1000 + 
> 0x467 pages)
> xc_dom_pfn_to_ptr: pfn out of range (0x1000 > 0x0)
> xc_dom_release: called
> ...
> 
> Is this a red herring, or did the reboot code somehow forget
> to get the right amount of memory?

This is a real bug.  I'll fix it.

Ewan.

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