pvgrub "Error 9: Unknown boot failure" booting Debian Jessie kernel (Was: Re: [PATCH v5 6/9] libxc: create unmapped initrd in domain builder if supported)

[Ian Campbell <ian.campbell@citrix.com>]

On Mon, 2015-11-30 at 13:59 +0100, Juergen Gross wrote:
> On 30/11/15 13:35, Ian Campbell wrote:
> > FYI attempting to upgrade osstest to use Debian Jessie in the guest
> > seems
> > to have exposed another issue here.
> > 
> > http://logs.test-lab.xenproject.org/osstest/logs/65172/test-amd64-amd64-amd64-pvgrub/info.html
> > 
> >       Booting 'Debian GNU/Linux, kernel 3.16.0-4-amd64'
> > 
> >     root  (hd0,0)
> >      Filesystem type is ext2fs, partition type 0x83
> >     kernel  /boot/vmlinuz-3.16.0-4-amd64 root=UUID=12447529-e85a-4b41-86b6-3e83ccfc
> >     1377 ro 
> >     initrd  /boot/initrd.img-3.16.0-4-amd64
> > 
> >     ============= Init TPM Front ================
> >     Tpmfront:Error Unable to read device/vtpm/0/backend-id during tpmfront initialization! error = ENOENT
> >     Tpmfront:Info Shutting down tpmfront
> >     pin_table(x) returned 1357193
> >     close(3)
> > 
> >     Error 9: Unknown boot failure
> > 
> >     Press any key to continue...
> > 
> > xen.git 6853c9bf9ff0 is OK, whereas 713b7e4ef2aa is not. Adding your two
> > outstanding patches:
> >     libxc: correct domain builder for 64 bit guest with 32 bit tools
> >     libxc: use correct return type for do_memory_op()
> > 
> > Doesn't appear to have helped. Anyway, I was in the process of
> > investigating/bisecting etc but since I was mailing you any way I thought
> > I'd mention it. I'll start a fresh thread once I have some more to go on.
> 
> When something was wrong with pvgrub in my tests of the patches it died
> right away and didn't show random errors later. I don't think the
> problem you are seeing is related to my recent changes. OTOH I have been
> wrong before. :-(

Bisection has blamed 06954411ee14 "xen: add generic flag to elf_dom_parms
indicating support of unmapped initrd" which I'm struggling to explain
right now...

Ian.

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