Re: [xen-unstable test] 64494: regressions - FAIL

[Juergen Gross <jgross@suse.com>]

On 19/11/15 11:30, Ian Campbell wrote:
> On Thu, 2015-11-19 at 11:24 +0100, Juergen Gross wrote:
>> On 18/11/15 15:49, Wei Liu wrote:
>>> Hi Juergen
>>>
>>> Looks like there is something we missed after all.
>>>
>>> On Wed, Nov 18, 2015 at 02:31:57PM +0000, osstest service owner wrote:
>>>> flight 64494 xen-unstable real [real]
>>>> http://logs.test-lab.xenproject.org/osstest/logs/64494/
>>>>
>>>> Regressions :-(
>>>>
>>>> Tests which did not succeed and are blocking,
>>>> including tests which could not be run:
>>>
>>>>  test-amd64-amd64-i386-pvgrub 10 guest-start               fail REGR.
>>>> vs. 64035
>>>
>>> Nov 18 05:11:19.753014 (d2) Bootstrapping...
>>> Nov 18 05:11:19.769108 (d2) Xen Minimal OS!
>>> Nov 18 05:11:19.769134 (d2)   start_info: 0xa13000(VA)
>>> Nov 18 05:11:19.769158 (d2)     nr_pages: 0x20000
>>> Nov 18 05:11:19.777046 (d2)   shared_inf: 0xca1fc000(MA)
>>> Nov 18 05:11:19.777072 (d2)      pt_base: 0xa16000(VA)
>>> Nov 18 05:11:19.785042 (d2) nr_pt_frames: 0xb
>>> Nov 18 05:11:19.785077 (d2)     mfn_list: 0x993000(VA)
>>> Nov 18 05:11:19.785108 (d2)    mod_start: 0x0(VA)
>>> Nov 18 05:11:19.785135 (d2)      mod_len: 0
>>> Nov 18 05:11:19.793047 (d2)        flags: 0x0
>>> Nov 18 05:11:19.793077 (d2)     cmd_line: (hd0,0)/boot/grub/menu.lst
>>> Nov 18 05:11:19.793108 (d2)        stack: 0x972580-0x992580
>>> Nov 18 05:11:19.801150 (d2) MM: Init
>>> Nov 18 05:11:19.801181 (d2)       _text: 0x0(VA)
>>> Nov 18 05:11:19.801197 (d2)      _etext: 0x7b22d(VA)
>>> Nov 18 05:11:19.809104 (d2)    _erodata: 0xa4000(VA)
>>> Nov 18 05:11:19.809123 (d2)      _edata: 0xa81a8(VA)
>>> Nov 18 05:11:19.809138 (d2) stack start: 0x972580(VA)
>>> Nov 18 05:11:19.817062 (d2)        _end: 0x992b30(VA)
>>> Nov 18 05:11:19.817099 (d2)   start_pfn: a24
>>> Nov 18 05:11:19.817125 (d2)     max_pfn: 20000
>>> Nov 18 05:11:19.825037 (d2) Mapping memory range 0x1000000 - 0x20000000
>>> Nov 18 05:11:19.825071 (d2) setting 0x0-0xa4000 readonly
>>> Nov 18 05:11:19.825100 (d2) skipped 1000
>>> Nov 18 05:11:19.833049 (d2) MM: Initialise page allocator for
>>> b1c000(b1c000)-20000000(20000000)
>>> Nov 18 05:11:19.833089 (d2) Page fault at linear address c00008, eip
>>> 5fc70, regs 0x98ff28, sp b1c000, our_sp 0x98fefc, code 2
>>> Nov 18 05:11:19.849044 (d2) Page fault in pagetable walk (access to
>>> invalid memory?).
>>>
>>> The pvgrub in used is 32 bit. 64 bit (which I myself tested) seemed to
>>> be working fine.
>>
>> Okay, I'm hitting this issue, too. I'll investigate further.
> 
> Do we want to revert $something in the meantime? If so, what...

I'm rather sure this problem is present in 32 bit pvgrub only. I've
found a suspicious test for the need of allocating a new page table.
pvgrub seems to make assumptions which level 2 page tables are to
be present and which not. I'm quite sure it wouldn't be able to be
started by grub-xen as well...

In case I'm right I should be able to correct this until today
evening.


Juergen