On 15/06/16 20:54, Eric Heintzmann wrote: > How can we debug with upstream, without any access to a 390x machine ? You can ask for an access to Debian Porter machine: https://db.debian.org/machines.cgi https://dsa.debian.org/doc/schroot/ But I am afraid that the hard part is to isolate the compiler issue: for me, it was solve somewhere between gcc-5 and gcc-6. hth, Jerome