The following builds failed with clang-19 and clang-nightly on the Linux next-20241114 and next-20241115 tags on x86 architecture. But the build passed with gcc-13.

First seen on Linux next-20241114 tag. Good: next-20241113 Bad: next-20241114

build: * clang-19-lkftconfig * clang-nightly-lkftconfig

Reported-by: Linux Kernel Functional Testing lkft@linaro.org

Build log: --------- fs/netfs/read_retry.c:235:20: error: variable 'subreq' is uninitialized when used here [-Werror,-Wuninitialized] 235 | if (list_is_last(&subreq->rreq_link, &stream->subrequests)) | ^~~~~~ fs/netfs/read_retry.c:28:36: note: initialize the variable 'subreq' to silence this warning 28 | struct netfs_io_subrequest *subreq; | ^ | = NULL 1 error generated. make[5]: *** [scripts/Makefile.build:229: fs/netfs/read_retry.o] Error 1

Build image: ----------- - https://qa-reports.linaro.org/lkft/linux-next-master/build/next-20241114/tes... - https://qa-reports.linaro.org/lkft/linux-next-master/build/next-20241114/tes... - https://storage.tuxsuite.com/public/linaro/lkft/builds/2opUctayqtTsKWUeLDYKb...

Steps to reproduce: ------------ - tuxmake --runtime podman --target-arch x86_64 --toolchain clang-19 --kconfig https://storage.tuxsuite.com/public/linaro/lkft/builds/2opUctayqtTsKWUeLDYKb... LLVM=1 LLVM_IAS=1

metadata: ---- git describe: next-20241114 git repo: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git git sha: 37c5695cb37a20403947062be8cb7e00f6bed353 kernel config: https://storage.tuxsuite.com/public/linaro/lkft/builds/2opUctayqtTsKWUeLDYKb... build url: https://storage.tuxsuite.com/public/linaro/lkft/builds/2opUctayqtTsKWUeLDYKb... toolchain: clang-19 config: lkftconfig arch: x86_64

-- Linaro LKFT https://lkft.linaro.org