On Fri, Apr 6, 2018 at 9:47 AM, Kees Cook <keesc...@chromium.org> wrote: > On Fri, Apr 6, 2018 at 2:47 AM, Sebastian Ott <seb...@linux.vnet.ibm.com> > wrote: >> Today's kernel oopsed on s390. Bisect points to: >> 3c8ba0d61d04 ("kernel.h: Retain constant expression output for max()/min()") >> >> [ 1.898277] dasd-eckd 0.0.3304: DASD with 4 KB/block, 21636720 KB total >> size, 48 KB/track, compatible disk layout >> [ 1.898308] ------------[ cut here ]------------ >> [ 1.898310] kernel BUG at block/bio.c:1798! > > Well that's extremely bad. :( > >> Bisect log and config attached. I'll look at min/max users in the affected >> areas later today. > > Seems like a comparison of objdump output with/without the patch may > be needed. And why is this s390 only? Ugh.
I did a objdump diff with your .config and it's rather large -- mostly seems to be register swaps, so it's not easy to browse. BTW, what version of gcc did you use? I built using: s390x-linux-gnu-gcc (Ubuntu 7.3.0-13ubuntu1) 7.3.0 -Kees -- Kees Cook Pixel Security