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From: "hjl.tools at gmail dot com" <sourceware-bugzilla@sourceware.org>
To: glibc-bugs@sources.redhat.com
Subject: [Bug malloc/14562] threaded programs with x32 abi randomly crash with arena.c:661: heap_trim: Assertion `p->size == (0|0x1)' failed
Date: Sat, 08 Sep 2012 15:30:00 -0000
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http://sourceware.org/bugzilla/show_bug.cgi?id=14562

--- Comment #5 from H.J. Lu <hjl.tools at gmail dot com> 2012-09-08 15:30:13 UTC ---
The size of top chunk must be a multiple of MALLOC_ALIGNMENT.
But _int_new_arena has

  /* Set up the top chunk, with proper alignment. */
  ptr = (char *)(a + 1);
  misalign = (unsigned long)chunk2mem(ptr) & MALLOC_ALIGN_MASK;
  if (misalign > 0)
    ptr += MALLOC_ALIGNMENT - misalign;
  top(a) = (mchunkptr)ptr;
  set_head(top(a), (((char*)h + h->size) - ptr) | PREV_INUSE);

It doesn't check size requirement.

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