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[Bug malloc/15073] Race condition using ATOMIC_FASTBINS in _int_free causes crash or heap corruption


https://sourceware.org/bugzilla/show_bug.cgi?id=15073

--- Comment #3 from Nate Gallaher <nate+sourceware at jaybridge dot com> ---
I can reproduce this on the Ubuntu Trusty Tahr amd64 daily snapshot:
(d6856805ca67b41eac70213736c198eb *trusty-desktop-amd64.iso)

This confirms the bug's existence up through eglibc 2.17-93ubuntu4. I have
attached an updated recipe for this target.

testuser@trusty:~$ apt-cache policy libc6
libc6:
  Installed: 2.17-93ubuntu4
  Candidate: 2.17-93ubuntu4

testuser@trusty:~$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu Trusty Tahr (development branch)
Release: 14.04
Codename: trusty

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