Hi Greg and Nick, On 2021-02-11 10:46 -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? We found this issue building Linux From Scratch (http://www.linuxfromscratch.org/lfs/view/development/). We use the latest stable kernel in the project so we have no report of older branches. I tried 5.4.97 with a configuration "looks like" the one triggers the segfault in 5.10.15. But 5.4.97 build does not segfault. However, I guess for "some" config older branches may segfault too. > > 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. I strongly agree, or it may affect "rolling-release" distros (which are likely to use binutils-2.36.1 and linux-5.10.y together) in an annoying way. > 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. I attached a config in https://bugzilla.kernel.org/show_bug.cgi?id=211693 (also attached in this mail). It reproduces the issue for 5.10.15 very reliably. At least three of us tried this configuration on the system personally used (with binutils-2.36.1) and we got exactly same error: objtool segfaults on apic.o. > 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). -- Xi Ruoyao <xry111@xxxxxxxxxxxxxxxx> School of Aerospace Science and Technology, Xidian University
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