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[ARCH] risc-vThis bug impacts ARCH=riscvThis bug impacts ARCH=riscv[BUG] linuxA bug that should be fixed in the mainline kernel.A bug that should be fixed in the mainline kernel.[FIXED][LINUX] 6.16This bug was fixed in Linux 6.16This bug was fixed in Linux 6.16[TOOL] llvm-readelfThe issue is relevant to LLVM readelfThe issue is relevant to LLVM readelf
Description
After commit 89079520cef6 ("RISC-V: vDSO: Wire up getrandom() vDSO implementation") in -next, I see a warning from llvm-readelf with ARCH=riscv allmodconfig. As of next-20250527, a tangential fix is needed for LLVM=1 to work.
$ make -skj"$(nproc)" ARCH=riscv LLVM=1 mrproper allmodconfig arch/riscv/kernel/vdso/
llvm-readelf: warning: 'arch/riscv/kernel/vdso/vdso.so.dbg': invalid PT_DYNAMIC size (0xb8)
llvm-readelf: warning: 'arch/riscv/kernel/vdso/vdso.so.dbg': PT_DYNAMIC dynamic table is invalid: SHT_DYNAMIC will be used
I was able to narrow this down to CONFIG_INIT_STACK_ALL_PATTERN (which enables -ftrivial-auto-var-init=pattern) on top of defconfig, which is different from the default of CONFIG_INIT_STACK_ALL_ZERO:
$ printf 'CONFIG_%s\n' INIT_STACK_ALL_{PATTERN=y,ZERO=n} >kernel/configs/init_stack_pattern.config
$ make -skj"$(nproc)" ARCH=riscv LLVM=1 clean defconfig init_stack_pattern.config arch/riscv/kernel/vdso/
llvm-readelf: warning: 'arch/riscv/kernel/vdso/vdso.so.dbg': invalid PT_DYNAMIC size (0xb8)
llvm-readelf: warning: 'arch/riscv/kernel/vdso/vdso.so.dbg': PT_DYNAMIC dynamic table is invalid: SHT_DYNAMIC will be used
@MaskRay have you ever seen anything like this? There are a few times this warning has shown up before but I have never seen it until this point. Are there any recommendations for debugging this?
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[ARCH] risc-vThis bug impacts ARCH=riscvThis bug impacts ARCH=riscv[BUG] linuxA bug that should be fixed in the mainline kernel.A bug that should be fixed in the mainline kernel.[FIXED][LINUX] 6.16This bug was fixed in Linux 6.16This bug was fixed in Linux 6.16[TOOL] llvm-readelfThe issue is relevant to LLVM readelfThe issue is relevant to LLVM readelf