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Re: [Xen-devel] 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)



On Mon, 2015-11-30 at 13:16 +0000, Ian Campbell wrote:
> 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-amd
> > > 64-amd64-pvgrub/info.html
> > > 
> > > ÂÂÂÂÂÂBooting 'Debian GNU/Linux, kernel 3.16.0-4-amd64'
> > > 
> > > ÂÂÂÂrootÂÂ(hd0,0)
> > > ÂÂÂÂÂFilesystem type is ext2fs, partition type 0x83
> > > ÂÂÂÂkernelÂÂ/boot/vmlinuz-3.16.0-4-amd64 root=UUID=12447529-e85a-
> > > 4b41-86b6-3e83ccfc
> > > ÂÂÂÂ1377 ro 
> > > ÂÂÂÂinitrdÂÂ/boot/initrd.img-3.16.0-4-amd64
> > > 
> > > ÂÂÂÂ============= Init TPM Front ================
> > > ÂÂÂÂTpmfront:Error Unable to read device/vtpm/0/backend-id during
> > > tpmfront initialization! error = ENOENT
> > > ÂÂÂÂTpmfront:Info Shutting down tpmfront
> > > ÂÂÂÂpin_table(x) returned 1357193
> > > ÂÂÂÂclose(3)
> > > 
> > > ÂÂÂÂError 9: Unknown boot failure
> > > 
> > > ÂÂÂÂPress any key to continue...
> > > 
> > > xen.git 6853c9bf9ff0 is OK, whereas 713b7e4ef2aa is not. Adding your
> > > two
> > > outstanding patches:
> > > ÂÂÂÂlibxc: correct domain builder for 64 bit guest with 32 bit tools
> > > ÂÂÂÂlibxc: 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...

And trying again it has blamed ea7c8a3d0e82 "libxc: reorganize domain
builder guest memory allocator" which is far more likely.

I double checked clean rebuilds twice this time and ea7c8a3d0e82 is bad
while 6853c9bf9ff0 "MINIOS_UPSTREAM_REVISION Update" is good.

Now, the question is why...

Ian.

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