Hi Arnd, On Thu, Feb 04, 2021 at 04:29:47PM +0100, Arnd Bergmann wrote: > From: Arnd Bergmann <arnd@xxxxxxxx> > > ARM randconfig builds with lld sometimes show a build failure > from kallsyms: > > Inconsistent kallsyms data > Try make KALLSYMS_EXTRA_PASS=1 as a workaround > > The problem is the veneers/thunks getting added by the linker extend > the symbol table, which in turn leads to more veneers being needed, > so it may take a few extra iterations to converge. > > This bug has been fixed multiple times before, but comes back every time > a new symbol name is used. lld uses a different set of idenitifiers from > ld.bfd, so the additional ones need to be added as well. > > I looked through the sources and found that arm64 and mips define similar > prefixes, so I'm adding those as well, aside from the ones I observed. I'm > not sure about powerpc64, which seems to already be handled through a > section match, but if it comes back, the "__long_branch_" and "__plt_" > prefixes would have to get added as well. > This is such a whack-a-mole. The problem is hitting us yet again. I suspect it may be due to a new version of lld using new symbols, but I didn't really try to track it down. Is there an easy way to search for missed symbols ? In this context .. is there a chance to apply [1] after all ? This is getting really time consuming and annoying, and I really dislike having to fix the same problem over and over again. Thanks, Guenter --- [1] https://patchwork.kernel.org/project/linux-kbuild/patch/20200910153204.156871-1-linux@xxxxxxxxxxxx/
