[Bug 1844785] [NEW] apparent memory leak using posix_memalign

[DGelling]

Public bug reported:

when allocating and deallocating memory of sufficient size with
posix_memalign while keeping smaller allocations done with malloc, a
memory leak happens. This only appears when using certain ranges of
allocation sizes, and can cause the system to lock up when running out
of memory while only having a few megabytes allocated on a 16GB ram
machine.

lsb_release -rd:

Description:    Ubuntu 18.04.3 LTS
Release:        18.04

apt-cache policy libc6:

libc6:
  Installed: 2.27-3ubuntu1
  Candidate: 2.27-3ubuntu1
  Version table:
 *** 2.27-3ubuntu1 500
        500 http://archive.ubuntu.com/ubuntu bionic/main amd64 Packages
        100 /var/lib/dpkg/status

see attached for a small program that will trigger the memory leak

I have not tried this on other distros, so don't know if this is ubuntu
specific

** Affects: glibc (Ubuntu)
     Importance: Undecided
         Status: New

** Attachment added: "small programs that causes a memory leak"
   https://bugs.launchpad.net/bugs/1844785/+attachment/5289944/+files/memleak.c

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https://bugs.launchpad.net/bugs/1844785

Title:
  apparent memory leak using posix_memalign

Status in glibc package in Ubuntu:
  New

Bug description:
  when allocating and deallocating memory of sufficient size with
  posix_memalign while keeping smaller allocations done with malloc, a
  memory leak happens. This only appears when using certain ranges of
  allocation sizes, and can cause the system to lock up when running out
  of memory while only having a few megabytes allocated on a 16GB ram
  machine.

  lsb_release -rd:

  Description:    Ubuntu 18.04.3 LTS
  Release:        18.04

  apt-cache policy libc6:

  libc6:
    Installed: 2.27-3ubuntu1
    Candidate: 2.27-3ubuntu1
    Version table:
   *** 2.27-3ubuntu1 500
          500 http://archive.ubuntu.com/ubuntu bionic/main amd64 Packages
          100 /var/lib/dpkg/status

  see attached for a small program that will trigger the memory leak

  I have not tried this on other distros, so don't know if this is
  ubuntu specific

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