Hi, There seems to be a regression in v4.16 on ppc compat very similar to sparc compat regression reported earlier at https://marc.info/?l=linux-sparc&m=151501500704383 . The symptoms are exactly the same: the same signal_receive test from the strace test suite fails with the same diagnostics: https://build.opensuse.org/public/build/home:ldv_alt/openSUSE_Factory_PowerPC/ppc/strace/_log Unfortunately, I do not have any means to investigate further, so just passing this information on to those who care. -- ldv