Thanks Richard, I did open an accompanying report on Bugzilla: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=123777
It turns out to be a duplicate of an existing report that has gone stale: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=121588 Apologies for the duplicate - I didn't find it when searching beforehand. That said, hopefully this mailing list post helps bring renewed attention to the issue. On Fri, Jan 23, 2026, 5:22 AM Richard Earnshaw (foss) < [email protected]> wrote: > On 22/01/2026 23:04, Adam Willis via Gcc wrote: > > Hello, > > > > I'm hitting an ICE in GCC 15.1.0 when building the Linux kernel with LTO > > for aarch64. The same build succeeds with GCC 14.2.0. > > > > Target: aarch64-linux-gnu > > Host: x86_64-pc-linux-gnu (cross-compile) > > GCC: 15.1.0 > > > > LTO flags: -flto=jobserver -fipa-pta -fno-fat-lto-objects > > -fuse-linker-plugin -fwhole-program > > > > The crash occurs during the final link of vmlinux.o: > > > > LD vmlinux.o > > during IPA pass: icf > > lto1: internal compiler error: Segmentation fault > > 0x1fc85c8 diagnostic_context::diagnostic_impl(rich_location*, > > diagnostic_metadata const*, diagnostic_option_id, char const*, > > __va_list_tag (*) [1], diagnostic_t) > > ???:0 > > 0x1fda171 internal_error(char const*, ...) > > ???:0 > > 0xbd68fd lto_get_decl_name_mapping(lto_file_decl_data*, char const*) > > ???:0 > > 0x8722ad cgraph_node::get_untransformed_body() > > ???:0 > > 0x1e1d8ac ipa_icf::sem_function::init(ipa_icf_gimple::func_checker*) > > ???:0 > > 0x1e20705 ipa_icf::sem_item_optimizer::parse_nonsingleton_classes() > > ???:0 > > 0x1e29a40 ipa_icf::sem_item_optimizer::execute() > > ???:0 > > 0x1e2b09c ipa_icf::pass_ipa_icf::execute(function*) > > ???:0 > > > > Workaround: -fno-ipa-icf allows the build to proceed. > > > > Kernel: Linux 6.1.159 (android14-6.1) > > Source: https://github.com/0ctobot/neutrino_kernel_google_caimito > > Branch: neutrino-google-caimito-6.1 > > Defconfig: neutrino_caimito_defconfig > > > > I don't have a reduced test case, but happy to provide more info or test > > patches if needed. > > > > $ aarch64-linux-gnu-gcc -v > > Using built-in specs. > > COLLECT_GCC=aarch64-linux-gnu-gcc > > COLLECT_LTO_WRAPPER=/usr/lib/gcc/aarch64-linux-gnu/15.1.0/lto-wrapper > > Target: aarch64-linux-gnu > > Configured with: /build/aarch64-linux-gnu-gcc/src/gcc-15.1.0/configure > > --prefix=/usr --program-prefix=aarch64-linux-gnu- > > --with-local-prefix=/usr/aarch64-linux-gnu > > --with-sysroot=/usr/aarch64-linux-gnu > > --with-build-sysroot=/usr/aarch64-linux-gnu > > --with-native-system-header-dir=/include --libdir=/usr/lib > > --libexecdir=/usr/lib --target=aarch64-linux-gnu > --host=x86_64-pc-linux-gnu > > --build=x86_64-pc-linux-gnu --disable-nls --enable-default-pie > > --enable-languages=c,c++,fortran --enable-shared --enable-threads=posix > > --with-system-zlib --with-isl --enable-__cxa_atexit > > --disable-libunwind-exceptions --enable-clocale=gnu > --disable-libstdcxx-pch > > --disable-libssp --enable-gnu-unique-object --enable-linker-build-id > > --enable-lto --enable-plugin --enable-install-libiberty > > --with-linker-hash-style=gnu --enable-gnu-indirect-function > > --disable-multilib --disable-werror --enable-checking=release > > Thread model: posix > > Supported LTO compression algorithms: zlib zstd > > gcc version 15.1.0 (GCC) > > > > Kind regards, > > Adam W. > > Please report a bug in our bugzilla: https://gcc.gnu.org/bugzilla. > Include as much information as you can so that somebody can try to > reproduce the issue. > > R. > >
