0006-disable-mremap.patch

disable use of mremap()

This patch prevents avoids a crash that occurs when the address returned by
mremap() is effectively being masked by ERTS_SUPERALIGNED_MASK, leading to a
subsequent fault on unmapped memory. The root cause of this masking is still
being investigated, but removing the definition of ERTS_HAVE_OS_MREMAP allows
erlang/OTP to run without using mremap() for the time being.

diff --git a/erts/emulator/sys/common/erl_mmap.h b/erts/emulator/sys/common/erl_mmap.h
index a30b7d2..c29fb62 100644
--- a/erts/emulator/sys/common/erl_mmap.h
+++ b/erts/emulator/sys/common/erl_mmap.h
@@ -36,9 +36,6 @@
 #if HAVE_MMAP
 #  define ERTS_HAVE_OS_MMAP 1
 #  define ERTS_HAVE_GENUINE_OS_MMAP 1
-#  if HAVE_MREMAP
-#    define ERTS_HAVE_OS_MREMAP 1
-#  endif
 /*
  * MAP_NORESERVE is undefined in FreeBSD 10.x and later.
  * This is to enable 64bit HiPE experimentally on FreeBSD.