[Bug malloc/14581] glibc leaks memory and do not reuse after free (leading to unlimited RSS growth)

["bugdal at aerifal dot cx" <sourceware-bugzilla at sourceware dot org>]

http://sourceware.org/bugzilla/show_bug.cgi?id=14581

Rich Felker <bugdal at aerifal dot cx> changed:

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                 CC|                            |bugdal at aerifal dot cx

--- Comment #1 from Rich Felker <bugdal at aerifal dot cx> 2012-09-14 19:26:39 UTC ---
Is this supposed to be a bug report or a trick question for CS students? :) You
claimed "there is no heap fragmentation", but the allocation/free pattern
you're performing seems like a classic fragmentation stress test pattern. There
is no general-purpose allocation strategy that can avoid all instances of
pathological fragmentation, and this pattern is one that would be especially
hard to avoid without having special-cased it (and probably making malloc
behavior much worse for common real-world cases). Did you run into this issue
in a real-world application, or did you construct this test as a worst-case?

By the way, the pathological fragmentation observed here does not seem specific
to glibc. It seems like it will occur with any allocator utilizing the basic
dlmalloc strategy. I just confirmed that the same issue happens with ours in
musl libc.

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