[Bug 1709727] Re: asan causes hangs on arm64

[Brian Murray]

Hello dann, or anyone else affected,

Accepted gcc-5 into xenial-proposed. The package will build now and be
available at
https://launchpad.net/ubuntu/+source/gcc-5/5.4.0-6ubuntu1~16.04.5 in a
few hours, and then in the -proposed repository.

Please help us by testing this new package.  See
https://wiki.ubuntu.com/Testing/EnableProposed for documentation on how
to enable and use -proposed.Your feedback will aid us getting this
update out to other Ubuntu users.

If this package fixes the bug for you, please add a comment to this bug,
mentioning the version of the package you tested and change the tag from
verification-needed-xenial to verification-done-xenial. If it does not
fix the bug for you, please add a comment stating that, and change the
tag to verification-failed-xenial. In either case, details of your
testing will help us make a better decision.

Further information regarding the verification process can be found at
https://wiki.ubuntu.com/QATeam/PerformingSRUVerification .  Thank you in
advance!

** Changed in: gcc-5 (Ubuntu Xenial)
       Status: Triaged => Fix Committed

** Tags added: verification-needed verification-needed-xenial

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

Title:
  asan causes hangs on arm64

Status in gcc-5 package in Ubuntu:
  Fix Released
Status in gcc-6 package in Ubuntu:
  Fix Released
Status in gcc-5 source package in Xenial:
  Fix Committed
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 ...]

  Plus see the tests in the libasan testsuite succeed.

  [Regression Risk]
  None, unless the 48bit-vma support is removed again from the kernel. Can't find the corresponding kernel SRU which explained the regression potential in this kernel change.

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