<p>It is about dst uri ($du) because the error message is about previous memory fragment:</p>
<pre><code>qm_debug_check_frag(): BUG: qm: prev. fragm. tail overwritten(c0c0c000, abcdefed)[0x801544380:0x8015443b8]
</code></pre>
<p>And looking at the previous fragment, the details show it was allocated by set_dst_uri():</p>
<pre><code>$1 = {size = 32, u = {nxt_free = 0x0 <tsl>, is_free = 0}, 
  file = 0x208a40 "core: core/parser/msg_parser.c", func = 0x2059c3 "set_dst_uri", 
  mname = 0x2067f2 "core", line = 752, check = 4042322160}
</code></pre>

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