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[Launchpad Bug Tracker <1709727@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package gcc-6 - 6.4.0-4ubuntu1

---------------
gcc-6 (6.4.0-4ubuntu1) artful; urgency=medium

  * Merge with Debian; remaining changes:
    - Build from upstream sources.

gcc-6 (6.4.0-4) unstable; urgency=medium

  * Update to SVN 20170820 (r251205) from the gcc-6-branch.
    - Fix PR target/81894 (x86), PR target/81861 (x86),
      PR tree-optimization/81354, PR c++/71570.
  * Don't build the gc enabled libobjc for cross compilers. Closes: #872301.
  * Fix hangs w/ asan binaries on arm64 (Dann Frazier). LP: #1709727.

 -- Matthias Klose <doko@xxxxxxxxxx>  Sun, 20 Aug 2017 17:27:57 +0200

** Changed in: gcc-6 (Ubuntu)
       Status: Triaged => Fix Released

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https://bugs.launchpad.net/bugs/1709727

Title:
  asan causes hangs on arm64

Status in gcc-5 package in Ubuntu:
  Triaged
Status in gcc-6 package in Ubuntu:
  Fix Released
Status in gcc-5 source package in Xenial:
  Triaged
Status in gcc-6 source package in Xenial:
  Invalid
Status in gcc-5 source package in Zesty:
  Triaged
Status in gcc-6 source package in Zesty:
  Triaged

Bug description:
  [Impact]
  Binaries built w/ asan support hang on arm64. This causes many timeouts during the test phase of a gcc build, causing builds to need ~24 hours to complete.

  [Test Case]
  $ cat test.c
  #include <stdio.h>

  void main() {
    printf("hi.\n");
  }
  $ gcc test.c -g -fsanitize=address -fno-omit-frame-pointer test.c -o test
  $ ./test
  ==46644==AddressSanitizer CHECK failed: ../../../../src/libsanitizer/sanitizer_common/sanitizer_allocator.h:844 "((res)) < ((kNumPossibleRegions))" (0xffffb4b, 0x8000000)
  [... HANG ...]

  [Regression Risk]

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