[Bug libc/3313] New: madvise(M_MXFAST,0) sets up a crash

["pasky at suse dot cz" <sourceware-bugzilla at sourceware dot org>]

When a program calls madvise(M_MXFAST, 0), it will crash the next time it tries
to do some memory allocation or get into an infinite loop when it remadvises
M_MXFAST to some other value. The problem probably stems from the handling of
the first two "unindexable" bins (although I'm not sure right now how are they
unindexable) - madvise(M_MXFAST, 0) will set the max_fast to SMALLBIN_WIDTH but
fastbin_index(SMALLBIN_WIDTH) == -1, which ain't any good when you use that as
an index to the buckets array.

-- 
           Summary: madvise(M_MXFAST,0) sets up a crash
           Product: glibc
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: libc
        AssignedTo: drepper at redhat dot com
        ReportedBy: pasky at suse dot cz
                CC: glibc-bugs at sources dot redhat dot com


http://sourceware.org/bugzilla/show_bug.cgi?id=3313

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