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[Bug malloc/22611] malloc might succeed and set errno to ENOMEM in case of heap allocation failure


https://sourceware.org/bugzilla/show_bug.cgi?id=22611

--- Comment #5 from Aurelien Jarno <aurelien at aurel32 dot net> ---
(In reply to Carlos O'Donell from comment #2)
> Can you create a test case that adds an mmap just after the brk region, this
> should cause a failure to happen. The test case will need to call brk to
> figure out *where* the current break is, then add some space, then place an
> mmap there, and see if the expanding sbrk fails.

Thanks for the hint. I have added a testcase that exhibit the issue on x86-64
and probably other architectures.

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