On Fri, Mar 21, 2025 at 8:21 PM Maciej Wieczor-Retman <maciej.wieczor-retman@xxxxxxxxx> wrote: > > >To account for this, let's then set hwasan-instrument-with-calls=0 > >when CONFIG_KASAN_INLINE is enabled. And also please add a comment > >explaining why this is done. > > After adding this option the kernel doesn't want to boot past uncompressing :b > > I went into Samuel's clang PR [1] and found there might be one more LShr that > needs changing into AShr [2]? But I'm not very good at clang code. Do you maybe > know if anything else in the clang code could be messing things up? > > After changing that LShr to AShr it moves a little further and hangs on some > initmem setup code. Then I thought my KASAN_SHADOW_OFFSET is an issue so I > changed to 4-level paging and the offset to 0xfffffc0000000000 and it moves a > little further and panics on kmem_cache_init. I'll be debugging that further but > just thought I'd ask if you know about something missing from the compiler side? > > [1] https://github.com/llvm/llvm-project/pull/103727 > [2] https://github.com/SiFiveHolland/llvm-project/blob/up/hwasan-opt/llvm/lib/Transforms/Instrumentation/HWAddressSanitizer.cpp#L995 Hm, I only recall looking at the compiler code when investigating [1]. But as this series points out, [1] can be considered a feature and not a bug. Other than that, nothing comes to mind. Thanks! [1] https://bugzilla.kernel.org/show_bug.cgi?id=218043
