https://bugs.kde.org/show_bug.cgi?id=274189

--- Comment #4 from Eric Hoffman <ehoff...@videotron.ca> ---
It's simply not implemented...

Line 312 in coregrind/m_syswrap/syswrap-generic.c

   /* kernel doesn't reject this, but we do. */
   if (old_len == 0)
      goto eINVAL;

This behavior had been added to Linux man pages in Sept 2017

https://git.kernel.org/pub/scm/docs/man-pages/man-pages.git/commit/man2/mremap.2?id=aa002e8145e643dd7f3a6a1cbe20d5291738438a

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