[Xen-devel] Build issues since XSA 240

[Emmanuel Vadot <manu@xxxxxxxxxxxxxxxx>]

 Hello,

 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-0764c6f6d385feed46c4b18803dabc282a50ae8b.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-2261d6ad42adef475fa638b87f7364df155919a9.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.

 I really don't know what's happening and if someone have any idea how
to debug this I'll be very happy.

 I've also put the xen-syms binary here :
https://www.bidouilliste.com/xen/xen-syms-0764c6f6d385feed46c4b18803dabc282a50ae8b
https://www.bidouilliste.com/xen/xen-syms-2261d6ad42adef475fa638b87f7364df155919a9

 Thanks,

-- 
Emmanuel Vadot <manu@xxxxxxxxxxxxxxxx> <manu@xxxxxxxxxxx>

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