Re: [Xen-devel] livepatch-build-tools regression

["Wieczorkiewicz, Pawel" <wipawel@xxxxxxxxx>]

It looks like gcc plays the usual dirty tricks with local variables renaming:

- xen-syms
  7529: ffff82d0805fed50     8 OBJECT  LOCAL  DEFAULT 4230 lastpage.22857
- livepatch
   289: 0000000000000000     8 OBJECT  GLOBAL DEFAULT  UND hvm.c#lastpage.22856

Then, symbols resolution by name fails..

Can you please try to build the livepatch module with additional option 
'—prelink' and give it a try ?

> On 26. Nov 2019, at 18:51, Wieczorkiewicz, Pawel <wipawel@xxxxxxxxx> wrote:
> 
> 
> 
>> On 20. Nov 2019, at 12:42, Sergey Dyasli <sergey.dyasli@xxxxxxxxxx> wrote:
>> 
>> On 19/11/2019 17:21, Wieczorkiewicz, Pawel wrote:
>>> 
>>> 
>>>> On 18. Nov 2019, at 18:41, Sergey Dyasli <sergey.dyasli@xxxxxxxxxx> wrote:
>>>> 
>>>> On 18/11/2019 17:28, Wieczorkiewicz, Pawel wrote:
>>>>> 
>>>>> Could you build the lp with debug (-d) and provide me with the 
>>>>> create-diff-object.log file?
>>>>> 
>>>> 
>>>> I've attached the log. Btw, I think I provided all the necessary 
>>>> information
>>>> for others to repeat my experiment.
>>>> 
>>> 
>>> Sorry for another request, but I do not seem to be able to reproduce this 
>>> locally.
>>> Could you send me the livepatch module binary that fails to upload?
>> 
>> That's interesting. I've attached the binary that my system produces.
>> What version of gcc do you use?
> 
> The version used was: gcc (GCC) 7.2.1 20170915
> 
> But I have finally managed to reproduce the issue with:
> 1. gcc (Ubuntu 6.5.0-2ubuntu1~18.04) 6.5.0 20181026
> 2. gcc-7 (Ubuntu 7.4.0-1ubuntu1~18.04.1) 7.4.0
> 
> I think it is not related to the commit:
> commit 854a7ca60e35 "create-diff-object: Do not include all .rodata sections"
> 
> I managed to reproduce it also with earlier version commit:
> "0c10457 Remove section alignment requirement"
> 
> But this time a different symbol causes the failure:
> 
> (XEN) livepatch: 0001-live-patch: Unknown symbol: hvm.c#lastpage.22856
> 
>> 
>> --
>> Thanks,
>> Sergey
>> <0001-live-patch-stripped.livepatch>
> 
> Best Regards,
> Pawel Wieczorkiewicz

Best Regards,
Pawel Wieczorkiewicz






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