Re: riscv gcc-13 allyesconfig error the frame size of 2064 bytes is larger than 2048 bytes [-Werror=frame-larger-than=]

On Fri, May 23, 2025 at 03:49:54PM +0200, Arnd Bergmann wrote:
> On Fri, May 23, 2025, at 15:19, Naresh Kamboju wrote:
> > On Thu, 22 May 2025 at 22:18, Kent Overstreet <[email protected]> wrote:
> >>
> >> On Thu, May 22, 2025 at 06:59:53PM +0530, Naresh Kamboju wrote:
> >> > Regressions on riscv allyesconfig build failed with gcc-13 on the Linux next
> >> > tag next-20250516 and next-20250522.
> >> >
> >> > First seen on the next-20250516
> >> >  Good: next-20250515
> >> >  Bad:  next-20250516
> >> >
> >> > Regressions found on riscv:
> >> >  - build/gcc-13-allyesconfig
> >> >
> >> > Regression Analysis:
> >> >  - New regression? Yes
> >> >  - Reproducible? Yes
> >> >
> >> > Build regression: riscv gcc-13 allyesconfig error the frame size of
> >> > 2064 bytes is larger than 2048 bytes [-Werror=frame-larger-than=]
> >>
> >> Is this a kmsan build? kmsan seems to inflate stack usage by quite a
> >> lot.
> 
> KMSAN is currently a clang-only feature.
> 
> > This is allyesconfig build which has KASAN builds.
> >
> > CONFIG_HAVE_ARCH_KASAN=y
> > CONFIG_HAVE_ARCH_KASAN_VMALLOC=y
> > CONFIG_CC_HAS_KASAN_GENERIC=y
> > CONFIG_CC_HAS_WORKING_NOSANITIZE_ADDRESS=y
> > CONFIG_KASAN=y
> > CONFIG_CC_HAS_KASAN_MEMINTRINSIC_PREFIX=y
> > CONFIG_KASAN_GENERIC=y
> > # CONFIG_KASAN_OUTLINE is not set
> > CONFIG_KASAN_INLINE=y
> > CONFIG_KASAN_STACK=y
> 
> I reproduced the problem locally and found this to go down to
> 1440 bytes after I turn off KASAN_STACK. next-20250523 has
> some changes that take the number down further to 1136 with
> KASAN_STACK and or 1552 with KASAN_STACK.
> 
> I've turned bcachefs with kasan-stack on for my randconfig
> builds again to see if there are any remaining corner cases.

Thanks for the numbers - that does still seem high, I'll have to have a
look with pahole.