On Fri, Feb 12, 2021 at 04:30:49PM +0100, Greg Kroah-Hartman wrote: > On Thu, Feb 11, 2021 at 10:46:05AM -0800, Nick Desaulniers wrote: > > On Thu, Feb 11, 2021 at 5:55 AM Greg Kroah-Hartman > > <gregkh@xxxxxxxxxxxxxxxxxxx> wrote: > > > > > > On Thu, Feb 11, 2021 at 09:32:03PM +0800, Xi Ruoyao wrote: > > > > Hi all, > > > > > > > > The latest GNU assembler (binutils-2.36.1) is removing unused section symbols > > > > like Clang [1]. So linux-5.10.15 can't be built with binutils-2.36.1 now. It > > > > has been reported as https://bugzilla.kernel.org/show_bug.cgi?id=211693. > > > > Xi, > > Happy Lunar New Year to you, too, and thanks for the report. Did you > > observe such segfaults for older branches of stable? > > > > > 2.36 of binutils fails to build the 4.4.y tree right now as well, but as > > > objtool isn't there, I don't know what to do about it :( > > > > Greg, > > There may be multiple issues in the latest binutils release for the > > kernel; we should still avoid segfaults in host tools so I do > > recommend considering this patch for inclusion at least into 5.10.y. > > Arnd's report in https://github.com/ClangBuiltLinux/linux/issues/1207 > > mentions this was found via randconfig testing, so likely some set of > > configs is needed to reproduce reliably. > > > > Do you have more info about the failure you're observing? Trolling > > lore, I only see: > > https://lore.kernel.org/stable/YCLeJcQFsDIsrAEc@xxxxxxxxx/ > > (Maybe it was reported on a different list; I only searched stable ML). > > I didn't report it anywhere. > > Here's the output of doing a 'make allmodconfig' on the latest 4.4.257 > release failing with binutils 2.36 > > Cannot find symbol for section 8: .text.unlikely. > kernel/kexec_file.o: failed > make[1]: *** [scripts/Makefile.build:277: kernel/kexec_file.o] Error 1 > make[1]: *** Deleting file 'kernel/kexec_file.o' > make[1]: *** Waiting for unfinished jobs.... > > 4.9.257 works fine, probably because we are using objtool? > > Any ideas are appreciated. [ Adding Steve Rostedt ] This error message comes from recordmcount. It probably can't handle the missing STT_SECTION symbols which are getting stripped by the new binutils. (Objtool also had trouble with that.) No idea why you only see this on 4.4 though. -- Josh
