[Bug ld/18867] New: ld reloc sorting causes glibc to crash on alpha

[vapier at gentoo dot org]

https://sourceware.org/bugzilla/show_bug.cgi?id=18867

            Bug ID: 18867
           Summary: ld reloc sorting causes glibc to crash on alpha
           Product: binutils
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: ld
          Assignee: amodra at gmail dot com
          Reporter: vapier at gentoo dot org
                CC: rth at twiddle dot net
        Depends on: 17666
  Target Milestone: ---
            Target: alphaev68-unknown-linux-gnu

we noticed that binutils-2.25.1 causes glibc to segfault when exiting:

we tracked it back to this commit:
https://sourceware.org/git/?p=binutils-gdb.git;a=commitdiff;h=53df40a43c968f4d97754226d62775d1fe665459

and current master also breaks (going back to the original commit):
https://sourceware.org/git/?p=binutils-gdb.git;a=commitdiff;h=28dbcedc7b1282b93c3f25c4e42ae71b44e8e2a8

if i take current master and force sort=false (the equiv of defining
sort_relocs_p for the alpha backend and having it always return false), then
glibc links & runs just fine.

i don't know if we should disable sorting for the alpha backend all the time,
or if there's a change to reloc processing in glibc that we can make.


Referenced Bugs:

https://sourceware.org/bugzilla/show_bug.cgi?id=17666
[Bug 17666] ld -r may create reloc sections with unordered relocs
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