[Bug malloc/17581] New: malloc_usable_size: expected 7 but got 11

["jim at lemke dot org" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=17581

            Bug ID: 17581
           Summary: malloc_usable_size: expected 7 but got 11
           Product: glibc
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: malloc
          Assignee: unassigned at sourceware dot org
          Reporter: jim at lemke dot org

glibc testing sometimes generates this failure:
   FAIL: malloc/tst-malloc-usable.out
   malloc_usable_size: expected 7 but got 11

I have seen the problem in 2.17 and later.

The problem is in the malloc checking code.
malloc/hooks.c: __malloc_check_init(), mem2mem_check(), mem2chunk_check()

I have submitted a fix to the libc-alpha list.

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