Re: [Xen-devel] Build issues since XSA 240

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 17.10.17 at 14:44, <manu@xxxxxxxxxxxxxxxx> wrote:
>  We are seeing some build issues since XSA 240 was released, since I
> didn't know if it was related to our build job I've isolated everything
> so anybody could recreate the test.
>  We use Xen 4.8.2 and build it on debian 9 (9.1 to be exact) and since
> XSA 240 we have xen crashing on some servers (mostly dev machine so
> it's ok but still ...).
>  As said to be sure that everyone can recreate the problem I've created
> a script that ~do what our jenkins job is doing : 
> https://gist.github.com/evadot/40f92fb5320121fd8ee3b6d0d9c256c1 
>  I've set the bits for reproducible build since it makes it easier to
> test on multiple machines.
>  With this script runned on a debian 9.1 machine (either vm or
> physical) from /root/ directly (I didn't found the variable that remove
> build path for repro build if one exists) I get the build id
> 0764c6f6d385feed46c4b18803dabc282a50ae8b and when starting this binary
> on a Dell C6100 (Xeon L5640) I have this :
> https://www.bidouilliste.com/xen/log_xen_4.8.2_xsa_231-xsa-245_gcc-0764c6f6d 
> 385feed46c4b18803dabc282a50ae8b.txt
> 
>  If I switch to clang (just added clang=y to make defconfig and make
> build) I have this :
> https://www.bidouilliste.com/xen/log_xen_4.8.2_xsa_231-xsa-245_clang-2261d6a 
> d42adef475fa638b87f7364df155919a9.txt
>   There seems to be some memory corruption on this last one (where the
> ram map is printed).
> 
>  But if I build it on my FreeBSD machine (12-CURRENT, clang 5.0.0) or a
> FreeBSD 11.1 VM (clang 4.0.0) I can boot my dom0 and start VMs.

Wasn't it you who (under email address emmanuel.vadot@xxxxxxxxx)
reported this same or a pretty similar problem to the discussion list
already during the embargo, finding out later that this was due to
flawed hardware on the build system of yours?

Jan


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