[{"id":3682051,"web_url":"http://patchwork.ozlabs.org/comment/3682051/","msgid":"<87mrys30uc.fsf@tarshish>","list_archive_url":null,"date":"2026-04-24T14:11:07","subject":"Re: [Buildroot] [PATCH 07/11] package/dropbear: disable ML-KEM768\n on m68k","submitter":{"id":1458,"url":"http://patchwork.ozlabs.org/api/people/1458/","name":"Baruch Siach","email":"baruch@tkos.co.il"},"content":"Hi Jean-Michel,\n\nOn Fri, Apr 24 2026, Jean-Michel Hautbois wrote:\n> ML-KEM768 post-quantum key exchange code (in the vendored header\n> src/libcrux_mlkem768_sha3.h) triggers a GCC internal compiler error\n> (ICE) in cselib_record_set during the postreload CSE pass on m68k.\n> Reproduced on m68k-buildroot-linux-uclibc (cf5441x, -O2) with both\n> GCC 14.3.0 (the current Buildroot default for m68k) and GCC 15.2.0.\n>\n> The failing pass backtrace is:\n> reload_cse_regs_1\n> -> pass_postreload_cse::execute\n> -> cselib_process_insn\n> -> cselib_record_sets\n> -> cselib_record_set (cselib.cc:2869 on gcc 15)\n>\n> Disable ML-KEM768 via localoptions.h on m68k until the GCC bug is\n> resolved. Standard key exchange algorithms remain available.\n\nCommon practice for GCC bugs is to add a BR2_TOOLCHAIN_HAS_GCC_BUG_[id]\nconfig symbol to toolchain/Config.in, and use that symbol to activate\nbug specific workaround. [id] refers to GCC Bugzilla bug ID. This makes\nit easier to track the GCC versions this bug affects.\n\nbaruch\n\n>\n> Signed-off-by: Jean-Michel Hautbois \n> ---\n> package/dropbear/dropbear.mk | 7 +++++++\n> 1 file changed, 7 insertions(+)\n>\n> diff --git a/package/dropbear/dropbear.mk b/package/dropbear/dropbear.mk\n> index e4e42cf994..52bc15e346 100644\n> --- a/package/dropbear/dropbear.mk\n> +++ b/package/dropbear/dropbear.mk\n> @@ -62,6 +62,13 @@ endef\n> DROPBEAR_POST_EXTRACT_HOOKS += DROPBEAR_SVR_PASSWORD_AUTH\n> endif\n> \n> +ifeq ($(BR2_m68k),y)\n> +define DROPBEAR_DISABLE_MLKEM\n> +\techo '#define DROPBEAR_MLKEM768 0' >> $(@D)/localoptions.h\n> +endef\n> +DROPBEAR_POST_EXTRACT_HOOKS += DROPBEAR_DISABLE_MLKEM\n> +endif\n> +\n> ifeq ($(BR2_PACKAGE_DROPBEAR_LEGACY_CRYPTO),y)\n> define DROPBEAR_ENABLE_LEGACY_CRYPTO\n> \techo '#define DROPBEAR_3DES 1' >> $(@D)/localoptions.h","headers":{"Return-Path":"","X-Original-To":["incoming-buildroot@patchwork.ozlabs.org","buildroot@buildroot.org"],"Delivered-To":["patchwork-incoming-buildroot@legolas.ozlabs.org","buildroot@buildroot.org"],"Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=buildroot.org header.i=@buildroot.org\n header.a=rsa-sha256 header.s=default header.b=N6UQAtCX;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=buildroot.org\n (client-ip=2605:bc80:3010::138; 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