[Bug 1999104] Re: libunwind causes crashes on arm64

[Matthew Ruffell]

Attached is a debdiff which fixes this problem on Focal.

** Patch added: "Debdiff for libunwind on Focal"
   https://bugs.launchpad.net/ubuntu/+source/libunwind/+bug/1999104/+attachment/5635451/+files/lp1999104_focal.debdiff

-- 
You received this bug notification because you are a member of Ubuntu
OpenStack, which is subscribed to libunwind in Ubuntu.
https://bugs.launchpad.net/bugs/1999104

Title:
  libunwind causes crashes on arm64

Status in libunwind package in Ubuntu:
  Fix Released
Status in libunwind source package in Bionic:
  In Progress
Status in libunwind source package in Focal:
  In Progress

Bug description:
  There is a bug in libunwind in both 18.04 and 20.04 on arm64 where
  when linked with libunwind instead of catching an exception, the
  program crashes. This was first seen on mcrouter, but attached is a
  small reproducer where `main_unwind` will crash. The libunwind
  shipping with 22.04 doesn't appear to have this problem, nor do
  unmodified upstream versions (including the 1.2.1 which is the 18.04
  and 20.04 version).

  Attached is a small reproducer that demonstrates the problem.

  Ubuntu 22.04:
  ```
  $ ./main
  int throws lib
  int caught main
  $ ./main_unwind
  int throws lib
  int caught main
  ```

  Ubuntu 20.04:
  ```
  $ ./main
  int throws lib
  int caught main
  $ ./main_unwind
  terminate called after throwing an instance of 'int'
  terminate called recursively
  Aborted (core dumped)
  ```

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/libunwind/+bug/1999104/+subscriptions