[PATCH] A workaround for getting process memory map taking too long for sanitizers on FreeBSD

[Viktor Kutuzov]

Hi kcc, samsonov,

This patch implements a workaround for the issue with sysctl(KERN_PROC_VMMAP) calls on FreeBSD:

http://www.freebsd.org/cgi/query-pr.cgi?pr=188911

The patch should be reverted back as soon as the bug is fixed.

Since the patch relies on reading '/dev/kmem' which is not accessible for normal users by default, the following command granting reading access to all users shall be executed before running tests:

  sudo chmod a+r /dev/kmem

http://reviews.llvm.org/D3732

Files:
  lib/sanitizer_common/sanitizer_procmaps_linux.cc
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