Hi Nathan,

On Tue, 13 Jun 2023 at 09:57, Naresh Kamboju naresh.kamboju@linaro.org wrote:

Hi Nathan,

On Tue, 13 Jun 2023 at 00:24, Nathan Chancellor nathan@kernel.org wrote:

...

Hi Naresh,

On Tue, Jun 13, 2023 at 12:10:30AM +0530, Naresh Kamboju wrote:

...

[Please ignore if it is already reported]

Following two builds failed on stable-rc 6.1.34-rc1.

• Powerpc: clang-nightly-maple_defconfig — FAIL
• Powerpc: clang-nightly-cell_defconfig — FAIL

...

As always, thanks for the report. This is an LLVM regression/change in behavior caused by [1], which can break as-option and as-instr on releases prior to commit d5c8d6e0fa61 ("kbuild: Update assembler calls to use proper flags and language target"), as unsupported flags for the current target ('-x') may be present (KBUILD_CFLAGS is used for these tests instead of KBUILD_AFLAGS). Inside try-run, the macro behind as-instr and as-option, I see

clang-17: error: unsupported option '-mno-prefixed' for target 'powerpc64le-linux-gnu' clang-17: error: unsupported option '-mno-pcrel' for target 'powerpc64le-linux-gnu' clang-17: error: unsupported option '-mno-altivec' for target 'powerpc64le-linux-gnu' clang-17: error: unsupported option '-mno-vsx' for target 'powerpc64le-linux-gnu' clang-17: error: unsupported option '-mno-mma' for target 'powerpc64le-linux-gnu' clang-17: error: unsupported option '-mno-spe' for target 'powerpc64le-linux-gnu'

This has come up recently elsewhere in PowerPC, see commit 2b694fc96fe3 ("powerpc/boot: Disable power10 features after BOOTAFLAGS assignment"). While I think it is dubious that clang errors on these flags for the assembler target, this is already fixed on the Linux side by using KBUILD_AFLAGS for these make macros.

I am preparing a series of d5c8d6e0fa61 and its dependencies for 6.1 but I want to do sufficient build testing first, which is currently running for me. Would you be able to point your matrix to [2] to make sure everything works properly with both GCC and LLVM? It is a work in progress as the second patch in the stack needs a proper commit message but it is the diff I expect to ship so that it all that matters.

We'll start building [2] with GCC and LLVM by using tuxplans and get back to you.

LKFT has been configured to run GCC and LLVM in total 205 builds and all the builds have passed on your tree / branch [2]. You can find the list of builds including kselftest, perf, rcutorture, kunit, kmemleak and many more combinations and architectures.

I request you to review the list of builds results and test results on projects page [3] [4]. I do not find any regressions compared with mainline master as sanity testing.

Do you think LKFT should build your tree / branch often ? We are happy to test anytime.

Thanks Daniel and Anders for your work.

build_names: that got tested and all have passed.

- clang-16-allnoconfig - clang-16-at91_dt_defconfig - clang-16-axm55xx_defconfig - clang-16-bcm2835_defconfig - clang-16-cell_defconfig - clang-16-clps711x_defconfig - clang-16-davinci_all_defconfig - clang-16-defconfig - clang-16-defconfig-40bc7ee5 - clang-16-exynos_defconfig - clang-16-footbridge_defconfig - clang-16-imx_v4_v5_defconfig - clang-16-imx_v6_v7_defconfig - clang-16-integrator_defconfig - clang-16-keystone_defconfig - clang-16-lkftconfig - clang-16-lkftconfig-compat - clang-16-lkftconfig-kcsan - clang-16-lkftconfig-no-kselftest-frag - clang-16-lpc32xx_defconfig - clang-16-maple_defconfig - clang-16-mpc83xx_defconfig - clang-16-multi_v5_defconfig - clang-16-multi_v5_defconfig-65236a87 - clang-16-mxs_defconfig - clang-16-nhk8815_defconfig - clang-16-omap1_defconfig - clang-16-omap2plus_defconfig - clang-16-orion5x_defconfig - clang-16-ppc64e_defconfig - clang-16-pxa910_defconfig - clang-16-s3c6400_defconfig - clang-16-s5pv210_defconfig - clang-16-sama5_defconfig - clang-16-shmobile_defconfig - clang-16-tinyconfig - clang-16-tqm8xx_defconfig - clang-16-u8500_defconfig - clang-16-vexpress_defconfig - clang-16-x86_64_defconfig - clang-nightly-allnoconfig - clang-nightly-at91_dt_defconfig - clang-nightly-axm55xx_defconfig - clang-nightly-bcm2835_defconfig - clang-nightly-cell_defconfig - clang-nightly-clps711x_defconfig - clang-nightly-davinci_all_defconfig - clang-nightly-defconfig - clang-nightly-defconfig-40bc7ee5 - clang-nightly-exynos_defconfig - clang-nightly-footbridge_defconfig - clang-nightly-imx_v4_v5_defconfig - clang-nightly-imx_v6_v7_defconfig - clang-nightly-integrator_defconfig - clang-nightly-keystone_defconfig - clang-nightly-lkftconfig - clang-nightly-lpc32xx_defconfig - clang-nightly-maple_defconfig - clang-nightly-mpc83xx_defconfig - clang-nightly-multi_v5_defconfig - clang-nightly-multi_v5_defconfig-65236a87 - clang-nightly-mxs_defconfig - clang-nightly-nhk8815_defconfig - clang-nightly-omap1_defconfig - clang-nightly-omap2plus_defconfig - clang-nightly-orion5x_defconfig - clang-nightly-ppc64e_defconfig - clang-nightly-pxa910_defconfig - clang-nightly-s3c6400_defconfig - clang-nightly-s5pv210_defconfig - clang-nightly-sama5_defconfig - clang-nightly-shmobile_defconfig - clang-nightly-tinyconfig - clang-nightly-tqm8xx_defconfig - clang-nightly-u8500_defconfig - clang-nightly-vexpress_defconfig - clang-nightly-x86_64_defconfig - gcc-11-allnoconfig - gcc-11-defconfig - gcc-11-dreamcast_defconfig - gcc-11-lkftconfig - gcc-11-lkftconfig-perf - gcc-11-microdev_defconfig - gcc-11-shx3_defconfig - gcc-11-tinyconfig - gcc-12-allnoconfig - gcc-12-ar7_defconfig - gcc-12-at91_dt_defconfig - gcc-12-ath79_defconfig - gcc-12-axm55xx_defconfig - gcc-12-bcm2835_defconfig - gcc-12-bcm47xx_defconfig - gcc-12-bcm63xx_defconfig - gcc-12-cavium_octeon_defconfig - gcc-12-cell_defconfig - gcc-12-clps711x_defconfig - gcc-12-davinci_all_defconfig - gcc-12-defconfig - gcc-12-defconfig-40bc7ee5 - gcc-12-exynos_defconfig - gcc-12-footbridge_defconfig - gcc-12-imx_v4_v5_defconfig - gcc-12-imx_v6_v7_defconfig - gcc-12-integrator_defconfig - gcc-12-ixp4xx_defconfig - gcc-12-keystone_defconfig - gcc-12-lkftconfig - gcc-12-lkftconfig-64k_page_size - gcc-12-lkftconfig-armv8_features - gcc-12-lkftconfig-compat - gcc-12-lkftconfig-debug - gcc-12-lkftconfig-debug-kmemleak - gcc-12-lkftconfig-devicetree - gcc-12-lkftconfig-kasan - gcc-12-lkftconfig-kselftest - gcc-12-lkftconfig-kunit - gcc-12-lkftconfig-libgpiod - gcc-12-lkftconfig-no-kselftest-frag - gcc-12-lkftconfig-perf - gcc-12-lkftconfig-rcutorture - gcc-12-lpc32xx_defconfig - gcc-12-malta_defconfig - gcc-12-maple_defconfig - gcc-12-mpc83xx_defconfig - gcc-12-multi_v5_defconfig - gcc-12-multi_v5_defconfig-65236a87 - gcc-12-mxs_defconfig - gcc-12-nhk8815_defconfig - gcc-12-omap1_defconfig - gcc-12-omap2plus_defconfig - gcc-12-orion5x_defconfig - gcc-12-ppc64e_defconfig - gcc-12-ppc6xx_defconfig - gcc-12-pxa910_defconfig - gcc-12-rt305x_defconfig - gcc-12-s3c6400_defconfig - gcc-12-s5pv210_defconfig - gcc-12-sama5_defconfig - gcc-12-shmobile_defconfig - gcc-12-tinyconfig - gcc-12-tqm8xx_defconfig - gcc-12-u8500_defconfig - gcc-12-vexpress_defconfig - gcc-8-allnoconfig - gcc-8-ar7_defconfig - gcc-8-at91_dt_defconfig - gcc-8-ath79_defconfig - gcc-8-axm55xx_defconfig - gcc-8-bcm2835_defconfig - gcc-8-bcm47xx_defconfig - gcc-8-bcm63xx_defconfig - gcc-8-cavium_octeon_defconfig - gcc-8-cell_defconfig - gcc-8-clps711x_defconfig - gcc-8-davinci_all_defconfig - gcc-8-defconfig - gcc-8-defconfig-40bc7ee5 - gcc-8-defconfig-fe40093d - gcc-8-dreamcast_defconfig - gcc-8-exynos_defconfig - gcc-8-footbridge_defconfig - gcc-8-i386_defconfig - gcc-8-imx_v4_v5_defconfig - gcc-8-imx_v6_v7_defconfig - gcc-8-integrator_defconfig - gcc-8-ixp4xx_defconfig - gcc-8-keystone_defconfig - gcc-8-lpc32xx_defconfig - gcc-8-malta_defconfig - gcc-8-maple_defconfig - gcc-8-microdev_defconfig - gcc-8-mpc83xx_defconfig - gcc-8-multi_v5_defconfig - gcc-8-mxs_defconfig - gcc-8-nhk8815_defconfig - gcc-8-omap1_defconfig - gcc-8-omap2plus_defconfig - gcc-8-orion5x_defconfig - gcc-8-ppc64e_defconfig - gcc-8-ppc6xx_defconfig - gcc-8-pxa910_defconfig - gcc-8-rt305x_defconfig - gcc-8-s3c6400_defconfig - gcc-8-s5pv210_defconfig - gcc-8-sama5_defconfig - gcc-8-shmobile_defconfig - gcc-8-shx3_defconfig - gcc-8-tinyconfig - gcc-8-tqm8xx_defconfig - gcc-8-u8500_defconfig - gcc-8-vexpress_defconfig - gcc-8-x86_64_defconfig - gcc-9-allnoconfig - gcc-9-axs103_defconfig - gcc-9-defconfig - gcc-9-tinyconfig - gcc-9-vdk_hs38_smp_defconfig - rv32-clang-16-allnoconfig - rv32-clang-16-defconfig - rv32-clang-16-lkftconfig - rv32-clang-16-tinyconfig - rv32-clang-nightly-allnoconfig - rv32-clang-nightly-defconfig - rv32-clang-nightly-tinyconfig - rv32-gcc-11-lkftconfig

...

[3] https://qa-reports.linaro.org/~anders.roxell/natan-6-1-asssembler-target-llv... [4] https://qa-reports.linaro.org/~anders.roxell/natan-6-1-asssembler-target-llv...

...

Cheers, Nathan

- Naresh

Hi the Clang nightly builds are failing on PowerPC with the ppc64e_defconfig. They started failing on Sept 11. Clang is failing on PowerPC in both linux-next and stable so it seems like something changed in Clang and not the kernel.

Unfortunately I don't have ready access to the /tmp/vgetrandom-fef220.c file that was generated, but hopefully these logs are enough to reproduce the issue.

regards, dan carpenter

tuxmake --target-arch=powerpc --kconfig=ppc64e_defconfig --toolchain=clang-nightly --wrapper=none --environment=KBUILD_BUILD_TIMESTAMP=@1758237451 --environment=KBUILD_BUILD_USER=tuxmake --environment=KBUILD_BUILD_HOST=tuxmake --environment=KCFLAGS=-ffile-prefix-map=/home/tuxbuild/.cache/tuxmake/builds/1/build/= --runtime=podman --image=855116176053.dkr.ecr.us-east-1.amazonaws.com/tuxmake/powerpc_clang-nightly LLVM=1 LLVM_IAS=0 LD=powerpc64le-linux-gnu-ld config default kernel xipkernel modules dtbs dtbs-legacy debugkernel headers make --silent --keep-going --jobs=8 O=/home/tuxbuild/.cache/tuxmake/builds/1/build ARCH=powerpc CROSS_COMPILE=powerpc64le-linux-gnu- HOSTCC=clang CC=clang LLVM=1 LLVM_IAS=0 LD=powerpc64le-linux-gnu-ld ppc64e_defconfig make --silent --keep-going --jobs=8 O=/home/tuxbuild/.cache/tuxmake/builds/1/build ARCH=powerpc CROSS_COMPILE=powerpc64le-linux-gnu- HOSTCC=clang CC=clang LLVM=1 LLVM_IAS=0 LD=powerpc64le-linux-gnu-ld fatal error: error in backend: Cannot select: 0x60f13bcf8910: ch,glue = PPCISD::CALL_NOP 0x60f13bcf5e70, TargetGlobalAddress:i32<ptr @__arch_chacha20_blocks_nostack> 0, Register:i64 $x3, Register:i64 $x4, Register:i64 $x5, Register:i64 $x6, Register:i64 $x2, RegisterMask:Untyped, 0x60f13bcf5e70:1 0x60f13bcf5e70: ch,glue = CopyToReg 0x60f13bcf8750, Register:i64 $x6, 0x60f13bcf5cb0, 0x60f13bcf8750:1 0x60f13bcf5cb0: i64 = zero_extend 0x60f13bcf8600 0x60f13bcf8600: i32 = srl 0x60f13bcf8280, Constant:i32<6> 0x60f13bcf8280: i32,ch = CopyFromReg 0x60f13bc01ec0, Register:i32 %43 0x60f13bcf8750: ch,glue = CopyToReg 0x60f13bcf6490, Register:i64 $x5, 0x60f13bcf8440, 0x60f13bcf6490:1 0x60f13bcf8440: i64 = zero_extend FrameIndex:i32<0> 0x60f13bcf6490: ch,glue = CopyToReg 0x60f13bcf8590, Register:i64 $x4, 0x60f13bcf69d0, 0x60f13bcf8590:1 0x60f13bcf69d0: i64 = zero_extend 0x60f13bcf5bd0 0x60f13bcf5bd0: i32,ch = CopyFromReg 0x60f13bc01ec0, Register:i32 %3 0x60f13bcf8590: ch,glue = CopyToReg 0x60f13bcf6960, Register:i64 $x3, 0x60f13bcf68f0 0x60f13bcf68f0: i64 = zero_extend 0x60f13bcf8520 0x60f13bcf8520: i32,ch = CopyFromReg 0x60f13bc01ec0, Register:i32 %44 In function: __c_kernel_getrandom clang: error: clang frontend command failed with exit code 70 (use -v to see invocation) Debian clang version 22.0.0 (++20250917082822+6c8fcd6089b9-1~exp1~20250917203011.86) Target: powerpc-unknown-linux-gnu Thread model: posix InstalledDir: /usr/lib/llvm-22/bin clang: note: diagnostic msg: ********************

PLEASE ATTACH THE FOLLOWING FILES TO THE BUG REPORT: Preprocessed source(s) and associated run script(s) are located at: clang: note: diagnostic msg: /tmp/vgetrandom-fef220.c clang: note: diagnostic msg: /tmp/vgetrandom-fef220.sh clang: note: diagnostic msg:

******************** fatal error: error in backend: Don't know how to emit this value. make[3]: *** [/builds/linux/arch/powerpc/kernel/vdso/Makefile:91: arch/powerpc/kernel/vdso/vgetrandom-32.o] Error 1 clang: error: clang frontend command failed with exit code 70 (use -v to see invocation) Debian clang version 22.0.0 (++20250917082822+6c8fcd6089b9-1~exp1~20250917203011.86) Target: powerpc-unknown-linux-gnu Thread model: posix InstalledDir: /usr/lib/llvm-22/bin clang: note: diagnostic msg: ********************

PLEASE ATTACH THE FOLLOWING FILES TO THE BUG REPORT: Preprocessed source(s) and associated run script(s) are located at: clang: note: diagnostic msg: /tmp/vgettimeofday-43498a.c clang: note: diagnostic msg: /tmp/vgettimeofday-43498a.sh clang: note: diagnostic msg:

******************** make[3]: *** [/builds/linux/arch/powerpc/kernel/vdso/Makefile:89: arch/powerpc/kernel/vdso/vgettimeofday-32.o] Error 1 make[3]: Target 'include/generated/vdso32-offsets.h' not remade because of errors. make[2]: *** [/builds/linux/arch/powerpc/Makefile:388: vdso_prepare] Error 2 make[2]: Target '__all' not remade because of errors. make[1]: *** [/builds/linux/Makefile:248: __sub-make] Error 2 make[1]: Target '__all' not remade because of errors. make: *** [Makefile:248: __sub-make] Error 2 make: Target '__all' not remade because of errors. rm -rf /home/tuxbuild/.cache/tuxmake/builds/1/build/modinstall make --silent --keep-going --jobs=8 O=/home/tuxbuild/.cache/tuxmake/builds/1/build INSTALL_MOD_STRIP=1 INSTALL_MOD_PATH=/home/tuxbuild/.cache/tuxmake/builds/1/build/modinstall ARCH=powerpc CROSS_COMPILE=powerpc64le-linux-gnu- HOSTCC=clang CC=clang LLVM=1 LLVM_IAS=0 LD=powerpc64le-linux-gnu-ld modules_install make[3]: *** No rule to make target 'modules.order', needed by '/home/tuxbuild/.cache/tuxmake/builds/1/build/modinstall/lib/modules/6.17.0-rc6/modules.order'. make[3]: *** No rule to make target 'modules.builtin', needed by '/home/tuxbuild/.cache/tuxmake/builds/1/build/modinstall/lib/modules/6.17.0-rc6/modules.builtin'. make[3]: *** No rule to make target 'modules.builtin.modinfo', needed by '/home/tuxbuild/.cache/tuxmake/builds/1/build/modinstall/lib/modules/6.17.0-rc6/modules.builtin.modinfo'. make[3]: Target '__modinst' not remade because of errors. make[2]: *** [/builds/linux/Makefile:1917: modules_install] Error 2 make[1]: *** [/builds/linux/Makefile:248: __sub-make] Error 2 make[1]: Target 'modules_install' not remade because of errors. make: *** [Makefile:248: __sub-make] Error 2 make: Target 'modules_install' not remade because of errors. make --silent --keep-going --jobs=8 O=/home/tuxbuild/.cache/tuxmake/builds/1/build INSTALL_DTBS_PATH=/home/tuxbuild/.cache/tuxmake/builds/1/build/dtbsinstall/dtbs ARCH=powerpc CROSS_COMPILE=powerpc64le-linux-gnu- HOSTCC=clang CC=clang LLVM=1 LLVM_IAS=0 LD=powerpc64le-linux-gnu-ld dtbs rm -rf /home/tuxbuild/.cache/tuxmake/builds/1/build/dtbsinstall mkdir -p /home/tuxbuild/.cache/tuxmake/builds/1/build/dtbsinstall/dtbs make --silent --keep-going --jobs=8 O=/home/tuxbuild/.cache/tuxmake/builds/1/build INSTALL_DTBS_PATH=/home/tuxbuild/.cache/tuxmake/builds/1/build/dtbsinstall/dtbs ARCH=powerpc CROSS_COMPILE=powerpc64le-linux-gnu- HOSTCC=clang CC=clang LLVM=1 LLVM_IAS=0 LD=powerpc64le-linux-gnu-ld dtbs_install tar --sort=name --owner=tuxmake:1000 --group=tuxmake:1000 --mtime=@1758237451 --clamp-mtime -caf /home/tuxbuild/.cache/tuxmake/builds/1/build/dtbs.tar.xz -C /home/tuxbuild/.cache/tuxmake/builds/1/build/dtbsinstall dtbs rm -rf /home/tuxbuild/.cache/tuxmake/builds/1/build/install_hdr make --silent --keep-going --jobs=8 O=/home/tuxbuild/.cache/tuxmake/builds/1/build INSTALL_HDR_PATH=/home/tuxbuild/.cache/tuxmake/builds/1/build/install_hdr/ ARCH=powerpc CROSS_COMPILE=powerpc64le-linux-gnu- HOSTCC=clang CC=clang LLVM=1 LLVM_IAS=0 LD=powerpc64le-linux-gnu-ld headers_install tar --sort=name --owner=tuxmake:1000 --group=tuxmake:1000 --mtime=@1758237451 --clamp-mtime -caf /home/tuxbuild/.cache/tuxmake/builds/1/build/headers.tar.xz -C /home/tuxbuild/.cache/tuxmake/builds/1/build/install_hdr .