https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83816
Richard Biener <rguenth at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Known to work|6.4.1 | Target Milestone|7.3 |6.5 Summary|[7 Regression] lto1: |[6/7 Regression] lto1: |internal compiler error: |internal compiler error: |compressed stream: data |compressed stream: data |error |error Known to fail| |6.4.1 --- Comment #16 from Richard Biener <rguenth at gcc dot gnu.org> --- Note your testcase only reproduces on the GCC 6 branch. It is expected that the issue happens because of some exact length of the uncompressed or compressed section or maybe even the actual contents... Do you run into this very often? It may be possible to extract a "zlib testcase" ... maybe it is a genuine bug in it? (however unlikely that is...)