Update: This was caused by valgrind which was unable to read read-only PT_LOAD segments and .rodata. In the end this wasn't triggered by glibc-2.27 but by binutils which now defaults to "ld -z" (I didn't notice before because bintuils was updated many weeks before so this was actually also my first complete rebuild using the new binutils).
There's already a valgrind patch: https://sourceware.org/git/gitweb.cgi?p=valgrind.git;a=commit;h=64aa729bfae71561505a40c12755bd6b55bb3061 And a follow-up patch: https://sourceware.org/git/gitweb.cgi?p=valgrind.git;a=commit;h=e752326cc050803c3bcfde1f8606bead66ff9642 This bug report can be closed, thanks. -- Regards, Thomas Deutschmann / Gentoo Linux Developer C4DD 695F A713 8F24 2AA1 5638 5849 7EE5 1D5D 74A5
