Re: error[E0080]: evaluation panicked: assertion failed: size_of::<isize>() == size_of::<isize_atomic_repr>()

[Philip Li]

On Mon, Oct 26, 2026 at 02:55:51PM -0700, Nathan Chancellor wrote:
> On Mon, Oct 26, 2026 at 01:51:14PM +0100, kernel test robot wrote:
> > Hi Nathan,
> > 
> > FYI, the error/warning still remains.
> 
> I think the result of this bisection is wrong. When building at the
> parent change (703749b069d5) with this toolchain, there is the error
> that this change (eb13a1ff271b) resolves:
> 
>   ld.lld: error: undefined symbol: memset
>   >>> referenced by getrandom.c:87 (lib/vdso/getrandom.c:87)
>   >>>               arch/loongarch/vdso/vgetrandom.o:(__vdso_getrandom)
>   make[4]: *** [arch/loongarch/vdso/Makefile:83: arch/loongarch/vdso/vdso.so.dbg] Error 1
> 
> If I use LLVM 23.1.4 + rust 1.99.1 to build at the parent change, I can
> get the same error reported, so I don't think my change is responsible
> for it.

Sorry for the false positive, I had updated the bot to avoid reporting this,
and I will check how to correct the bisection as next step.

> 
> > tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
> > head:   6b4b543fa18757297ac756a6fe6e64f506b7844a
> > commit: eb13a1ff271b0d180687eebb30611b0b276d5193 random: vDSO: avoid call to memset() when zeroing reserved parameter
> > date:   3 weeks ago
> > config: loongarch-randconfig-r2103-20261026 (https://download.01.org/0day-ci/archive/20261026/202610261307.vnC1uCAL-lkp@xxxxxxxxx/config)
> > compiler: clang version 24.0.0git (https://github.com/llvm/llvm-project 42d4451d86c175b745d6ea1c4081787994c7259b)
> > rustc: rustc 1.96.0 (ac68faa20 2026-05-25)
> > reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20261026/202610261307.vnC1uCAL-lkp@xxxxxxxxx/reproduce)
> > 
> > If you fix the issue in a separate patch/commit (i.e. not just a new version of
> > the same patch/commit), kindly add following tags
> > | Fixes: eb13a1ff271b ("random: vDSO: avoid call to memset() when zeroing reserved parameter")
> > | Reported-by: kernel test robot <lkp@xxxxxxxxx>
> > | Closes: https://lore.kernel.org/oe-kbuild-all/202610261307.vnC1uCAL-lkp@xxxxxxxxx/
> > 
> > All errors (new ones prefixed by >>):
> > 
> > >> error[E0080]: evaluation panicked: assertion failed: size_of::<isize>() == size_of::<isize_atomic_repr>()
> >    --> rust/kernel/build_assert.rs:112:23
> >    |
> >    112 |         const _: () = ::core::assert!($condition $(,$arg)?);
> >    |                       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ evaluation of `sync::atomic::predefine::_` failed here
> >    |
> >    ::: rust/kernel/sync/atomic/predefine.rs:98:1
> >    |
> >    98 | static_assert!(size_of::<isize>() == size_of::<isize_atomic_repr>());
> >    | -------------------------------------------------------------------- in this macro invocation
> >    |
> >    = note: this error originates in the macro `::core::assert` which comes from the expansion of the macro `static_assert` (in Nightly builds, run with -Z macro-backtrace for more info)
> > --
> > >> error[E0080]: evaluation panicked: assertion failed: align_of::<isize>() == align_of::<isize_atomic_repr>()
> >    --> rust/kernel/build_assert.rs:112:23
> >    |
> >    112 |         const _: () = ::core::assert!($condition $(,$arg)?);
> >    |                       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ evaluation of `sync::atomic::predefine::_` failed here
> >    |
> >    ::: rust/kernel/sync/atomic/predefine.rs:99:1
> >    |
> >    99 | static_assert!(align_of::<isize>() == align_of::<isize_atomic_repr>());
> >    | ---------------------------------------------------------------------- in this macro invocation
> >    |
> >    = note: this error originates in the macro `::core::assert` which comes from the expansion of the macro `static_assert` (in Nightly builds, run with -Z macro-backtrace for more info)
> > --
> > >> error[E0080]: evaluation panicked: assertion failed: size_of::<usize>() == size_of::<isize_atomic_repr>()
> >    --> rust/kernel/build_assert.rs:112:23
> >    |
> >    112 |         const _: () = ::core::assert!($condition $(,$arg)?);
> >    |                       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ evaluation of `sync::atomic::predefine::_` failed here
> >    |
> >    ::: rust/kernel/sync/atomic/predefine.rs:100:1
> >    |
> >    100 | static_assert!(size_of::<usize>() == size_of::<isize_atomic_repr>());
> >    | -------------------------------------------------------------------- in this macro invocation
> >    |
> >    = note: this error originates in the macro `::core::assert` which comes from the expansion of the macro `static_assert` (in Nightly builds, run with -Z macro-backtrace for more info)
> > --
> > >> error[E0080]: evaluation panicked: assertion failed: align_of::<usize>() == align_of::<isize_atomic_repr>()
> >    --> rust/kernel/build_assert.rs:112:23
> >    |
> >    112 |         const _: () = ::core::assert!($condition $(,$arg)?);
> >    |                       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ evaluation of `sync::atomic::predefine::_` failed here
> >    |
> >    ::: rust/kernel/sync/atomic/predefine.rs:101:1
> >    |
> >    101 | static_assert!(align_of::<usize>() == align_of::<isize_atomic_repr>());
> >    | ---------------------------------------------------------------------- in this macro invocation
> >    |
> >    = note: this error originates in the macro `::core::assert` which comes from the expansion of the macro `static_assert` (in Nightly builds, run with -Z macro-backtrace for more info)
> > 
> > --
> > 0-DAY CI Kernel Test Service
> > https://github.com/intel/lkp-tests/wiki
> 
> -- 
> Cheers,
> Nathan
>