(In reply to Dmitry V. Levin from comment #4)
> Just letting you know that we reverted commit
> 6b89c385d8bd0700b25bac2c2d0bebe68d5cc05d in our glibc build shortly after
> reporting this issue.

Reading rsync bug report, I really think that EOPNOTSUPP is the correct
error code to return in this case. The configure was done on a build
system where lchmod does work (since it has procps mounted). So I do not
fully agree this really characterizes as a regression.

And I don't think reverting lchmod support since propcs might be not
available is the correct approach, best option would try to ask kernel
to have proper syscall support which does not require userland hacks.
Rick Felker already sent a patch, but it seems to be stuck.

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https://bugs.launchpad.net/bugs/1902109

Title:
  rsync uses lchmod and fails in Ubuntu >= 20.10 if /proc isn't mounted

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