I marked debian-bug 918742 as being the upstream for this, but
technically that bug was against fakechroot and the only change was to
disable the hanging test; however jemalloc2 in debian did fix this, and
the changelog entry for the fix only mentions that debian bug.

** Summary changed:

- libjemalloc2 hangs on arm64 in some cases
+ libjemalloc2 hangs when used with fakechroot in some cases

** Description changed:

  [impact]
  
- under some circumstances, libjemalloc2 hangs on arm64 architecture.
+ under some circumstances, libjemalloc2 hangs when used with fakechroot
  
  [test case]
  
  as noted in debian bug 918742:
  
  >   apt install libfakechroot libjemalloc2
  >   LD_PRELOAD="libjemalloc.so.2 libfakechroot.so" /bin/true
  >   <hangs>
  
  [regression potential]
  
  this patch is already included in disco and later; regression potential
  should be low.  Regressions would likely result in more/different hangs.
  
  [other info]
  
  this patch is already included in disco/eoan.
  
  In bionic and earlier, jemalloc does not hook the _Unwind_Backtrace
  function.  This hook appears to be what introduces the problem, and
  jemalloc only starts hooking the function in cosmic.

** Bug watch added: Debian Bug tracker #918742
   https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=918742

** Also affects: jemalloc (Debian) via
   https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=918742
   Importance: Unknown
       Status: Unknown

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https://bugs.launchpad.net/bugs/1826883

Title:
  libjemalloc2 hangs when used with fakechroot in some cases

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