diff --git a/index.html b/index.html
index 59fab56..89a7382 100644
--- a/index.html
+++ b/index.html
@@ -79,55 +79,60 @@ provide some benefits in specific circumstances.
       <li><a id="toc-Procedures" href="#Procedures">1.1.1 Procedures</a></li>
       <li><a id="toc-Record-Types" href="#Record-Types">1.1.2 Record Types</a></li>
     </ul></li>
-    <li><a id="toc-_0028knots-non_002dblocking_0029" href="#knots_005fnon_002dblocking">1.2 (knots non-blocking)</a>
+    <li><a id="toc-_0028knots-backtraces_0029" href="#knots_005fbacktraces">1.2 (knots backtraces)</a>
     <ul class="toc-numbered-mark">
       <li><a id="toc-Procedures-1" href="#Procedures-1">1.2.1 Procedures</a></li>
+      <li><a id="toc-Record-Types-1" href="#Record-Types-1">1.2.2 Record Types</a></li>
     </ul></li>
-    <li><a id="toc-_0028knots-parallelism_0029" href="#knots_005fparallelism">1.3 (knots parallelism)</a>
+    <li><a id="toc-_0028knots-non_002dblocking_0029" href="#knots_005fnon_002dblocking">1.3 (knots non-blocking)</a>
     <ul class="toc-numbered-mark">
-      <li><a id="toc-Macros" href="#Macros">1.3.1 Macros</a></li>
-      <li><a id="toc-Procedures-2" href="#Procedures-2">1.3.2 Procedures</a></li>
+      <li><a id="toc-Procedures-2" href="#Procedures-2">1.3.1 Procedures</a></li>
     </ul></li>
-    <li><a id="toc-_0028knots-promise_0029" href="#knots_005fpromise">1.4 (knots promise)</a>
+    <li><a id="toc-_0028knots-parallelism_0029" href="#knots_005fparallelism">1.4 (knots parallelism)</a>
     <ul class="toc-numbered-mark">
-      <li><a id="toc-Macros-1" href="#Macros-1">1.4.1 Macros</a></li>
+      <li><a id="toc-Macros" href="#Macros">1.4.1 Macros</a></li>
       <li><a id="toc-Procedures-3" href="#Procedures-3">1.4.2 Procedures</a></li>
     </ul></li>
-    <li><a id="toc-_0028knots-queue_0029" href="#knots_005fqueue">1.5 (knots queue)</a>
+    <li><a id="toc-_0028knots-promise_0029" href="#knots_005fpromise">1.5 (knots promise)</a>
     <ul class="toc-numbered-mark">
-      <li><a id="toc-Procedures-4" href="#Procedures-4">1.5.1 Procedures</a></li>
+      <li><a id="toc-Macros-1" href="#Macros-1">1.5.1 Macros</a></li>
+      <li><a id="toc-Procedures-4" href="#Procedures-4">1.5.2 Procedures</a></li>
     </ul></li>
-    <li><a id="toc-_0028knots-resource_002dpool_0029" href="#knots_005fresource_002dpool">1.6 (knots resource-pool)</a>
+    <li><a id="toc-_0028knots-queue_0029" href="#knots_005fqueue">1.6 (knots queue)</a>
     <ul class="toc-numbered-mark">
-      <li><a id="toc-Macros-2" href="#Macros-2">1.6.1 Macros</a></li>
-      <li><a id="toc-Parameters" href="#Parameters">1.6.2 Parameters</a></li>
-      <li><a id="toc-Procedures-5" href="#Procedures-5">1.6.3 Procedures</a></li>
-      <li><a id="toc-Record-Types-1" href="#Record-Types-1">1.6.4 Record Types</a></li>
+      <li><a id="toc-Procedures-5" href="#Procedures-5">1.6.1 Procedures</a></li>
     </ul></li>
-    <li><a id="toc-_0028knots-sort_0029" href="#knots_005fsort">1.7 (knots sort)</a>
+    <li><a id="toc-_0028knots-resource_002dpool_0029" href="#knots_005fresource_002dpool">1.7 (knots resource-pool)</a>
     <ul class="toc-numbered-mark">
-      <li><a id="toc-Procedures-6" href="#Procedures-6">1.7.1 Procedures</a></li>
+      <li><a id="toc-Macros-2" href="#Macros-2">1.7.1 Macros</a></li>
+      <li><a id="toc-Parameters" href="#Parameters">1.7.2 Parameters</a></li>
+      <li><a id="toc-Procedures-6" href="#Procedures-6">1.7.3 Procedures</a></li>
+      <li><a id="toc-Record-Types-2" href="#Record-Types-2">1.7.4 Record Types</a></li>
     </ul></li>
-    <li><a id="toc-_0028knots-thread_002dpool_0029" href="#knots_005fthread_002dpool">1.8 (knots thread-pool)</a>
+    <li><a id="toc-_0028knots-sort_0029" href="#knots_005fsort">1.8 (knots sort)</a>
     <ul class="toc-numbered-mark">
-      <li><a id="toc-Macros-3" href="#Macros-3">1.8.1 Macros</a></li>
-      <li><a id="toc-Procedures-7" href="#Procedures-7">1.8.2 Procedures</a></li>
-      <li><a id="toc-Record-Types-2" href="#Record-Types-2">1.8.3 Record Types</a></li>
+      <li><a id="toc-Procedures-7" href="#Procedures-7">1.8.1 Procedures</a></li>
     </ul></li>
-    <li><a id="toc-_0028knots-timeout_0029" href="#knots_005ftimeout">1.9 (knots timeout)</a>
+    <li><a id="toc-_0028knots-thread_002dpool_0029" href="#knots_005fthread_002dpool">1.9 (knots thread-pool)</a>
     <ul class="toc-numbered-mark">
-      <li><a id="toc-Procedures-8" href="#Procedures-8">1.9.1 Procedures</a></li>
-      <li><a id="toc-Record-Types-3" href="#Record-Types-3">1.9.2 Record Types</a></li>
+      <li><a id="toc-Macros-3" href="#Macros-3">1.9.1 Macros</a></li>
+      <li><a id="toc-Procedures-8" href="#Procedures-8">1.9.2 Procedures</a></li>
+      <li><a id="toc-Record-Types-3" href="#Record-Types-3">1.9.3 Record Types</a></li>
     </ul></li>
-    <li><a id="toc-_0028knots-web_002dserver_0029" href="#knots_005fweb_002dserver">1.10 (knots web-server)</a>
+    <li><a id="toc-_0028knots-timeout_0029" href="#knots_005ftimeout">1.10 (knots timeout)</a>
     <ul class="toc-numbered-mark">
-      <li><a id="toc-Macros-4" href="#Macros-4">1.10.1 Macros</a></li>
-      <li><a id="toc-Procedures-9" href="#Procedures-9">1.10.2 Procedures</a></li>
-      <li><a id="toc-Record-Types-4" href="#Record-Types-4">1.10.3 Record Types</a></li>
+      <li><a id="toc-Procedures-9" href="#Procedures-9">1.10.1 Procedures</a></li>
+      <li><a id="toc-Record-Types-4" href="#Record-Types-4">1.10.2 Record Types</a></li>
     </ul></li>
-    <li><a id="toc-_0028knots-web_0029" href="#knots_005fweb">1.11 (knots web)</a>
+    <li><a id="toc-_0028knots-web_002dserver_0029" href="#knots_005fweb_002dserver">1.11 (knots web-server)</a>
     <ul class="toc-numbered-mark">
-      <li><a id="toc-Procedures-10" href="#Procedures-10">1.11.1 Procedures</a></li>
+      <li><a id="toc-Macros-4" href="#Macros-4">1.11.1 Macros</a></li>
+      <li><a id="toc-Procedures-10" href="#Procedures-10">1.11.2 Procedures</a></li>
+      <li><a id="toc-Record-Types-5" href="#Record-Types-5">1.11.3 Record Types</a></li>
+    </ul></li>
+    <li><a id="toc-_0028knots-web_0029" href="#knots_005fweb">1.12 (knots web)</a>
+    <ul class="toc-numbered-mark">
+      <li><a id="toc-Procedures-11" href="#Procedures-11">1.12.1 Procedures</a></li>
     </ul></li>
   </ul></li>
   <li><a id="toc-Version-History-1" href="#Version-History">Appendix A Version History</a></li>
@@ -152,14 +157,15 @@ Next: <a href="#Version-History" accesskey="n" rel="next">Version History</a>, P
 
 <ul class="mini-toc">
 <li><a href="#knots" accesskey="1">(knots)</a></li>
-<li><a href="#knots_005fnon_002dblocking" accesskey="2">(knots non-blocking)</a></li>
-<li><a href="#knots_005fparallelism" accesskey="3">(knots parallelism)</a></li>
-<li><a href="#knots_005fpromise" accesskey="4">(knots promise)</a></li>
-<li><a href="#knots_005fqueue" accesskey="5">(knots queue)</a></li>
-<li><a href="#knots_005fresource_002dpool" accesskey="6">(knots resource-pool)</a></li>
-<li><a href="#knots_005fsort" accesskey="7">(knots sort)</a></li>
-<li><a href="#knots_005fthread_002dpool" accesskey="8">(knots thread-pool)</a></li>
-<li><a href="#knots_005ftimeout" accesskey="9">(knots timeout)</a></li>
+<li><a href="#knots_005fbacktraces" accesskey="2">(knots backtraces)</a></li>
+<li><a href="#knots_005fnon_002dblocking" accesskey="3">(knots non-blocking)</a></li>
+<li><a href="#knots_005fparallelism" accesskey="4">(knots parallelism)</a></li>
+<li><a href="#knots_005fpromise" accesskey="5">(knots promise)</a></li>
+<li><a href="#knots_005fqueue" accesskey="6">(knots queue)</a></li>
+<li><a href="#knots_005fresource_002dpool" accesskey="7">(knots resource-pool)</a></li>
+<li><a href="#knots_005fsort" accesskey="8">(knots sort)</a></li>
+<li><a href="#knots_005fthread_002dpool" accesskey="9">(knots thread-pool)</a></li>
+<li><a href="#knots_005ftimeout">(knots timeout)</a></li>
 <li><a href="#knots_005fweb_002dserver">(knots web-server)</a></li>
 <li><a href="#knots_005fweb">(knots web)</a></li>
 </ul>
@@ -167,7 +173,7 @@ Next: <a href="#Version-History" accesskey="n" rel="next">Version History</a>, P
 <div class="section-level-extent" id="knots">
 <div class="nav-panel">
 <p>
-Next: <a href="#knots_005fnon_002dblocking" accesskey="n" rel="next">(knots non-blocking)</a>, Up: <a href="#API" accesskey="u" rel="up">API</a> &nbsp; [<a href="#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="#Concept-Index" title="Index" rel="index">Index</a>]</p>
+Next: <a href="#knots_005fbacktraces" accesskey="n" rel="next">(knots backtraces)</a>, Up: <a href="#API" accesskey="u" rel="up">API</a> &nbsp; [<a href="#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="#Concept-Index" title="Index" rel="index">Index</a>]</p>
 </div>
 <h3 class="section" id="g_t_0028knots_0029"><span>1.1 (knots)<a class="copiable-link" href="#g_t_0028knots_0029"> &para;</a></span></h3>
 
@@ -342,12 +348,12 @@ to the current error port every 20 seconds while waiting.
 <hr>
 </div>
 </div>
-<div class="section-level-extent" id="knots_005fnon_002dblocking">
+<div class="section-level-extent" id="knots_005fbacktraces">
 <div class="nav-panel">
 <p>
-Next: <a href="#knots_005fparallelism" accesskey="n" rel="next">(knots parallelism)</a>, Previous: <a href="#knots" accesskey="p" rel="prev">(knots)</a>, Up: <a href="#API" accesskey="u" rel="up">API</a> &nbsp; [<a href="#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="#Concept-Index" title="Index" rel="index">Index</a>]</p>
+Next: <a href="#knots_005fnon_002dblocking" accesskey="n" rel="next">(knots non-blocking)</a>, Previous: <a href="#knots" accesskey="p" rel="prev">(knots)</a>, Up: <a href="#API" accesskey="u" rel="up">API</a> &nbsp; [<a href="#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="#Concept-Index" title="Index" rel="index">Index</a>]</p>
 </div>
-<h3 class="section" id="g_t_0028knots-non_002dblocking_0029"><span>1.2 (knots non-blocking)<a class="copiable-link" href="#g_t_0028knots-non_002dblocking_0029"> &para;</a></span></h3>
+<h3 class="section" id="g_t_0028knots-backtraces_0029"><span>1.2 (knots backtraces)<a class="copiable-link" href="#g_t_0028knots-backtraces_0029"> &para;</a></span></h3>
 
 
 
@@ -355,11 +361,98 @@ Next: <a href="#knots_005fparallelism" accesskey="n" rel="next">(knots paralleli
 
 <ul class="mini-toc">
 <li><a href="#Procedures-1" accesskey="1">Procedures</a></li>
+<li><a href="#Record-Types-1" accesskey="2">Record Types</a></li>
 </ul>
 <div class="subsection-level-extent" id="Procedures-1">
 <h4 class="subsection"><span>1.2.1 Procedures<a class="copiable-link" href="#Procedures-1"> &para;</a></span></h4>
 
 
+<dl class="first-deffn">
+<dt class="deffn" id="index-classify_002dstack_002dsituation"><span class="category-def">Procedure: </span><span><strong class="def-name">classify-stack-situation</strong> <var class="def-var-arguments">a</var><a class="copiable-link" href="#index-classify_002dstack_002dsituation"> &para;</a></span></dt>
+<dd><p>Undocumented procedure.
+</p>
+</dd></dl>
+
+
+
+
+<dl class="first-deffn">
+<dt class="deffn" id="index-knots_002dexception_002dstack-1"><span class="category-def">Procedure: </span><span><strong class="def-name">knots-exception-stack</strong> <var class="def-var-arguments">obj</var><a class="copiable-link" href="#index-knots_002dexception_002dstack-1"> &para;</a></span></dt>
+<dd><p>Undocumented procedure.
+</p>
+</dd></dl>
+
+
+
+
+<dl class="first-deffn">
+<dt class="deffn" id="index-knots_002dexception_003f-1"><span class="category-def">Procedure: </span><span><strong class="def-name">knots-exception?</strong> <var class="def-var-arguments">obj</var><a class="copiable-link" href="#index-knots_002dexception_003f-1"> &para;</a></span></dt>
+<dd><p>Undocumented procedure.
+</p>
+</dd></dl>
+
+
+
+
+<dl class="first-deffn">
+<dt class="deffn" id="index-make_002dknots_002dexception-1"><span class="category-def">Procedure: </span><span><strong class="def-name">make-knots-exception</strong> <var class="def-var-arguments">a</var><a class="copiable-link" href="#index-make_002dknots_002dexception-1"> &para;</a></span></dt>
+<dd><p>Undocumented procedure.
+</p>
+</dd></dl>
+
+
+
+
+<dl class="first-deffn">
+<dt class="deffn" id="index-print_002dbacktrace_002dand_002dexception_002fknots-1"><span class="category-def">Procedure: </span><span><strong class="def-name">print-backtrace-and-exception/knots</strong> <var class="def-var-arguments">_ KEY: #:port</var><a class="copiable-link" href="#index-print_002dbacktrace_002dand_002dexception_002fknots-1"> &para;</a></span></dt>
+<dd><p>Undocumented procedure.
+</p>
+</dd></dl>
+
+
+
+
+
+</div>
+<div class="subsection-level-extent" id="Record-Types-1">
+<h4 class="subsection"><span>1.2.2 Record Types<a class="copiable-link" href="#Record-Types-1"> &para;</a></span></h4>
+
+
+<dl class="first-deftp">
+<dt class="deftp" id="index-_0026knots_002dexception-1"><span class="category-def">Record type: </span><span><strong class="def-name">&amp;knots-exception</strong><a class="copiable-link" href="#index-_0026knots_002dexception-1"> &para;</a></span></dt>
+<dd><p>This record type has the following fields:
+</p>
+<ul class="itemize mark-bullet">
+<li><code class="code">stack</code></li></ul>
+
+</dd></dl>
+
+
+
+
+
+
+<hr>
+</div>
+</div>
+<div class="section-level-extent" id="knots_005fnon_002dblocking">
+<div class="nav-panel">
+<p>
+Next: <a href="#knots_005fparallelism" accesskey="n" rel="next">(knots parallelism)</a>, Previous: <a href="#knots_005fbacktraces" accesskey="p" rel="prev">(knots backtraces)</a>, Up: <a href="#API" accesskey="u" rel="up">API</a> &nbsp; [<a href="#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="#Concept-Index" title="Index" rel="index">Index</a>]</p>
+</div>
+<h3 class="section" id="g_t_0028knots-non_002dblocking_0029"><span>1.3 (knots non-blocking)<a class="copiable-link" href="#g_t_0028knots-non_002dblocking_0029"> &para;</a></span></h3>
+
+
+
+
+
+<ul class="mini-toc">
+<li><a href="#Procedures-2" accesskey="1">Procedures</a></li>
+</ul>
+<div class="subsection-level-extent" id="Procedures-2">
+<h4 class="subsection"><span>1.3.1 Procedures<a class="copiable-link" href="#Procedures-2"> &para;</a></span></h4>
+
+
 <dl class="first-deffn">
 <dt class="deffn" id="index-non_002dblocking_002dopen_002dsocket_002dfor_002duri"><span class="category-def">Procedure: </span><span><strong class="def-name">non-blocking-open-socket-for-uri</strong> <var class="def-var-arguments">_ KEY: #:verify-certificate?</var><a class="copiable-link" href="#index-non_002dblocking_002dopen_002dsocket_002dfor_002duri"> &para;</a></span></dt>
 <dd><p>Open a socket for URI and return it as a non-blocking port.
@@ -397,7 +490,7 @@ defaults to <code class="code">#t</code>.
 <p>
 Next: <a href="#knots_005fpromise" accesskey="n" rel="next">(knots promise)</a>, Previous: <a href="#knots_005fnon_002dblocking" accesskey="p" rel="prev">(knots non-blocking)</a>, Up: <a href="#API" accesskey="u" rel="up">API</a> &nbsp; [<a href="#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="#Concept-Index" title="Index" rel="index">Index</a>]</p>
 </div>
-<h3 class="section" id="g_t_0028knots-parallelism_0029"><span>1.3 (knots parallelism)<a class="copiable-link" href="#g_t_0028knots-parallelism_0029"> &para;</a></span></h3>
+<h3 class="section" id="g_t_0028knots-parallelism_0029"><span>1.4 (knots parallelism)<a class="copiable-link" href="#g_t_0028knots-parallelism_0029"> &para;</a></span></h3>
 
 
 
@@ -405,10 +498,10 @@ Next: <a href="#knots_005fpromise" accesskey="n" rel="next">(knots promise)</a>,
 
 <ul class="mini-toc">
 <li><a href="#Macros" accesskey="1">Macros</a></li>
-<li><a href="#Procedures-2" accesskey="2">Procedures</a></li>
+<li><a href="#Procedures-3" accesskey="2">Procedures</a></li>
 </ul>
 <div class="subsection-level-extent" id="Macros">
-<h4 class="subsection"><span>1.3.1 Macros<a class="copiable-link" href="#Macros"> &para;</a></span></h4>
+<h4 class="subsection"><span>1.4.1 Macros<a class="copiable-link" href="#Macros"> &para;</a></span></h4>
 
 
 <dl class="first-deffn first-defmac-alias-first-deffn">
@@ -450,8 +543,8 @@ this will be raised after all exceptions have finished.
 
 
 </div>
-<div class="subsection-level-extent" id="Procedures-2">
-<h4 class="subsection"><span>1.3.2 Procedures<a class="copiable-link" href="#Procedures-2"> &para;</a></span></h4>
+<div class="subsection-level-extent" id="Procedures-3">
+<h4 class="subsection"><span>1.4.2 Procedures<a class="copiable-link" href="#Procedures-3"> &para;</a></span></h4>
 
 
 <dl class="first-deffn">
@@ -566,7 +659,7 @@ Further fibers block until a slot becomes free.
 <p>
 Next: <a href="#knots_005fqueue" accesskey="n" rel="next">(knots queue)</a>, Previous: <a href="#knots_005fparallelism" accesskey="p" rel="prev">(knots parallelism)</a>, Up: <a href="#API" accesskey="u" rel="up">API</a> &nbsp; [<a href="#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="#Concept-Index" title="Index" rel="index">Index</a>]</p>
 </div>
-<h3 class="section" id="g_t_0028knots-promise_0029"><span>1.4 (knots promise)<a class="copiable-link" href="#g_t_0028knots-promise_0029"> &para;</a></span></h3>
+<h3 class="section" id="g_t_0028knots-promise_0029"><span>1.5 (knots promise)<a class="copiable-link" href="#g_t_0028knots-promise_0029"> &para;</a></span></h3>
 
 
 
@@ -574,10 +667,10 @@ Next: <a href="#knots_005fqueue" accesskey="n" rel="next">(knots queue)</a>, Pre
 
 <ul class="mini-toc">
 <li><a href="#Macros-1" accesskey="1">Macros</a></li>
-<li><a href="#Procedures-3" accesskey="2">Procedures</a></li>
+<li><a href="#Procedures-4" accesskey="2">Procedures</a></li>
 </ul>
 <div class="subsection-level-extent" id="Macros-1">
-<h4 class="subsection"><span>1.4.1 Macros<a class="copiable-link" href="#Macros-1"> &para;</a></span></h4>
+<h4 class="subsection"><span>1.5.1 Macros<a class="copiable-link" href="#Macros-1"> &para;</a></span></h4>
 
 
 <dl class="first-deffn first-defmac-alias-first-deffn">
@@ -591,8 +684,8 @@ Next: <a href="#knots_005fqueue" accesskey="n" rel="next">(knots queue)</a>, Pre
 
 
 </div>
-<div class="subsection-level-extent" id="Procedures-3">
-<h4 class="subsection"><span>1.4.2 Procedures<a class="copiable-link" href="#Procedures-3"> &para;</a></span></h4>
+<div class="subsection-level-extent" id="Procedures-4">
+<h4 class="subsection"><span>1.5.2 Procedures<a class="copiable-link" href="#Procedures-4"> &para;</a></span></h4>
 
 
 <dl class="first-deffn">
@@ -662,17 +755,17 @@ yet started or is still in progress.
 <p>
 Next: <a href="#knots_005fresource_002dpool" accesskey="n" rel="next">(knots resource-pool)</a>, Previous: <a href="#knots_005fpromise" accesskey="p" rel="prev">(knots promise)</a>, Up: <a href="#API" accesskey="u" rel="up">API</a> &nbsp; [<a href="#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="#Concept-Index" title="Index" rel="index">Index</a>]</p>
 </div>
-<h3 class="section" id="g_t_0028knots-queue_0029"><span>1.5 (knots queue)<a class="copiable-link" href="#g_t_0028knots-queue_0029"> &para;</a></span></h3>
+<h3 class="section" id="g_t_0028knots-queue_0029"><span>1.6 (knots queue)<a class="copiable-link" href="#g_t_0028knots-queue_0029"> &para;</a></span></h3>
 
 
 
 
 
 <ul class="mini-toc">
-<li><a href="#Procedures-4" accesskey="1">Procedures</a></li>
+<li><a href="#Procedures-5" accesskey="1">Procedures</a></li>
 </ul>
-<div class="subsection-level-extent" id="Procedures-4">
-<h4 class="subsection"><span>1.5.1 Procedures<a class="copiable-link" href="#Procedures-4"> &para;</a></span></h4>
+<div class="subsection-level-extent" id="Procedures-5">
+<h4 class="subsection"><span>1.6.1 Procedures<a class="copiable-link" href="#Procedures-5"> &para;</a></span></h4>
 
 
 <dl class="first-deffn">
@@ -699,7 +792,7 @@ a time, preserving arrival order.
 <p>
 Next: <a href="#knots_005fsort" accesskey="n" rel="next">(knots sort)</a>, Previous: <a href="#knots_005fqueue" accesskey="p" rel="prev">(knots queue)</a>, Up: <a href="#API" accesskey="u" rel="up">API</a> &nbsp; [<a href="#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="#Concept-Index" title="Index" rel="index">Index</a>]</p>
 </div>
-<h3 class="section" id="g_t_0028knots-resource_002dpool_0029"><span>1.6 (knots resource-pool)<a class="copiable-link" href="#g_t_0028knots-resource_002dpool_0029"> &para;</a></span></h3>
+<h3 class="section" id="g_t_0028knots-resource_002dpool_0029"><span>1.7 (knots resource-pool)<a class="copiable-link" href="#g_t_0028knots-resource_002dpool_0029"> &para;</a></span></h3>
 
 
 
@@ -708,11 +801,11 @@ Next: <a href="#knots_005fsort" accesskey="n" rel="next">(knots sort)</a>, Previ
 <ul class="mini-toc">
 <li><a href="#Macros-2" accesskey="1">Macros</a></li>
 <li><a href="#Parameters" accesskey="2">Parameters</a></li>
-<li><a href="#Procedures-5" accesskey="3">Procedures</a></li>
-<li><a href="#Record-Types-1" accesskey="4">Record Types</a></li>
+<li><a href="#Procedures-6" accesskey="3">Procedures</a></li>
+<li><a href="#Record-Types-2" accesskey="4">Record Types</a></li>
 </ul>
 <div class="subsection-level-extent" id="Macros-2">
-<h4 class="subsection"><span>1.6.1 Macros<a class="copiable-link" href="#Macros-2"> &para;</a></span></h4>
+<h4 class="subsection"><span>1.7.1 Macros<a class="copiable-link" href="#Macros-2"> &para;</a></span></h4>
 
 
 <dl class="first-deffn first-defmac-alias-first-deffn">
@@ -763,7 +856,7 @@ Next: <a href="#knots_005fsort" accesskey="n" rel="next">(knots sort)</a>, Previ
 
 </div>
 <div class="subsection-level-extent" id="Parameters">
-<h4 class="subsection"><span>1.6.2 Parameters<a class="copiable-link" href="#Parameters"> &para;</a></span></h4>
+<h4 class="subsection"><span>1.7.2 Parameters<a class="copiable-link" href="#Parameters"> &para;</a></span></h4>
 
 
 <dl class="first-defvr">
@@ -779,8 +872,8 @@ Next: <a href="#knots_005fsort" accesskey="n" rel="next">(knots sort)</a>, Previ
 
 
 </div>
-<div class="subsection-level-extent" id="Procedures-5">
-<h4 class="subsection"><span>1.6.3 Procedures<a class="copiable-link" href="#Procedures-5"> &para;</a></span></h4>
+<div class="subsection-level-extent" id="Procedures-6">
+<h4 class="subsection"><span>1.7.3 Procedures<a class="copiable-link" href="#Procedures-6"> &para;</a></span></h4>
 
 
 <dl class="first-deffn">
@@ -1030,8 +1123,8 @@ number of seconds to wait; defaults to <code class="code">5</code>.  Raises
 
 
 </div>
-<div class="subsection-level-extent" id="Record-Types-1">
-<h4 class="subsection"><span>1.6.4 Record Types<a class="copiable-link" href="#Record-Types-1"> &para;</a></span></h4>
+<div class="subsection-level-extent" id="Record-Types-2">
+<h4 class="subsection"><span>1.7.4 Record Types<a class="copiable-link" href="#Record-Types-2"> &para;</a></span></h4>
 
 
 <dl class="first-deftp">
@@ -1092,17 +1185,17 @@ number of seconds to wait; defaults to <code class="code">5</code>.  Raises
 <p>
 Next: <a href="#knots_005fthread_002dpool" accesskey="n" rel="next">(knots thread-pool)</a>, Previous: <a href="#knots_005fresource_002dpool" accesskey="p" rel="prev">(knots resource-pool)</a>, Up: <a href="#API" accesskey="u" rel="up">API</a> &nbsp; [<a href="#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="#Concept-Index" title="Index" rel="index">Index</a>]</p>
 </div>
-<h3 class="section" id="g_t_0028knots-sort_0029"><span>1.7 (knots sort)<a class="copiable-link" href="#g_t_0028knots-sort_0029"> &para;</a></span></h3>
+<h3 class="section" id="g_t_0028knots-sort_0029"><span>1.8 (knots sort)<a class="copiable-link" href="#g_t_0028knots-sort_0029"> &para;</a></span></h3>
 
 
 
 
 
 <ul class="mini-toc">
-<li><a href="#Procedures-6" accesskey="1">Procedures</a></li>
+<li><a href="#Procedures-7" accesskey="1">Procedures</a></li>
 </ul>
-<div class="subsection-level-extent" id="Procedures-6">
-<h4 class="subsection"><span>1.7.1 Procedures<a class="copiable-link" href="#Procedures-6"> &para;</a></span></h4>
+<div class="subsection-level-extent" id="Procedures-7">
+<h4 class="subsection"><span>1.8.1 Procedures<a class="copiable-link" href="#Procedures-7"> &para;</a></span></h4>
 
 
 <dl class="first-deffn">
@@ -1132,7 +1225,7 @@ current fibers parallelism.
 <p>
 Next: <a href="#knots_005ftimeout" accesskey="n" rel="next">(knots timeout)</a>, Previous: <a href="#knots_005fsort" accesskey="p" rel="prev">(knots sort)</a>, Up: <a href="#API" accesskey="u" rel="up">API</a> &nbsp; [<a href="#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="#Concept-Index" title="Index" rel="index">Index</a>]</p>
 </div>
-<h3 class="section" id="g_t_0028knots-thread_002dpool_0029"><span>1.8 (knots thread-pool)<a class="copiable-link" href="#g_t_0028knots-thread_002dpool_0029"> &para;</a></span></h3>
+<h3 class="section" id="g_t_0028knots-thread_002dpool_0029"><span>1.9 (knots thread-pool)<a class="copiable-link" href="#g_t_0028knots-thread_002dpool_0029"> &para;</a></span></h3>
 
 
 
@@ -1140,11 +1233,11 @@ Next: <a href="#knots_005ftimeout" accesskey="n" rel="next">(knots timeout)</a>,
 
 <ul class="mini-toc">
 <li><a href="#Macros-3" accesskey="1">Macros</a></li>
-<li><a href="#Procedures-7" accesskey="2">Procedures</a></li>
-<li><a href="#Record-Types-2" accesskey="3">Record Types</a></li>
+<li><a href="#Procedures-8" accesskey="2">Procedures</a></li>
+<li><a href="#Record-Types-3" accesskey="3">Record Types</a></li>
 </ul>
 <div class="subsection-level-extent" id="Macros-3">
-<h4 class="subsection"><span>1.8.1 Macros<a class="copiable-link" href="#Macros-3"> &para;</a></span></h4>
+<h4 class="subsection"><span>1.9.1 Macros<a class="copiable-link" href="#Macros-3"> &para;</a></span></h4>
 
 
 <dl class="first-deffn first-defmac-alias-first-deffn">
@@ -1194,8 +1287,8 @@ Next: <a href="#knots_005ftimeout" accesskey="n" rel="next">(knots timeout)</a>,
 
 
 </div>
-<div class="subsection-level-extent" id="Procedures-7">
-<h4 class="subsection"><span>1.8.2 Procedures<a class="copiable-link" href="#Procedures-7"> &para;</a></span></h4>
+<div class="subsection-level-extent" id="Procedures-8">
+<h4 class="subsection"><span>1.9.2 Procedures<a class="copiable-link" href="#Procedures-8"> &para;</a></span></h4>
 
 
 <dl class="first-deffn">
@@ -1411,8 +1504,8 @@ bytes.
 
 
 </div>
-<div class="subsection-level-extent" id="Record-Types-2">
-<h4 class="subsection"><span>1.8.3 Record Types<a class="copiable-link" href="#Record-Types-2"> &para;</a></span></h4>
+<div class="subsection-level-extent" id="Record-Types-3">
+<h4 class="subsection"><span>1.9.3 Record Types<a class="copiable-link" href="#Record-Types-3"> &para;</a></span></h4>
 
 
 <dl class="first-deftp">
@@ -1437,18 +1530,18 @@ bytes.
 <p>
 Next: <a href="#knots_005fweb_002dserver" accesskey="n" rel="next">(knots web-server)</a>, Previous: <a href="#knots_005fthread_002dpool" accesskey="p" rel="prev">(knots thread-pool)</a>, Up: <a href="#API" accesskey="u" rel="up">API</a> &nbsp; [<a href="#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="#Concept-Index" title="Index" rel="index">Index</a>]</p>
 </div>
-<h3 class="section" id="g_t_0028knots-timeout_0029"><span>1.9 (knots timeout)<a class="copiable-link" href="#g_t_0028knots-timeout_0029"> &para;</a></span></h3>
+<h3 class="section" id="g_t_0028knots-timeout_0029"><span>1.10 (knots timeout)<a class="copiable-link" href="#g_t_0028knots-timeout_0029"> &para;</a></span></h3>
 
 
 
 
 
 <ul class="mini-toc">
-<li><a href="#Procedures-8" accesskey="1">Procedures</a></li>
-<li><a href="#Record-Types-3" accesskey="2">Record Types</a></li>
+<li><a href="#Procedures-9" accesskey="1">Procedures</a></li>
+<li><a href="#Record-Types-4" accesskey="2">Record Types</a></li>
 </ul>
-<div class="subsection-level-extent" id="Procedures-8">
-<h4 class="subsection"><span>1.9.1 Procedures<a class="copiable-link" href="#Procedures-8"> &para;</a></span></h4>
+<div class="subsection-level-extent" id="Procedures-9">
+<h4 class="subsection"><span>1.10.1 Procedures<a class="copiable-link" href="#Procedures-9"> &para;</a></span></h4>
 
 
 <dl class="first-deffn">
@@ -1535,8 +1628,8 @@ timeout, raises <code class="code">&amp;port-write-timeout-error</code>.  Both c
 
 
 </div>
-<div class="subsection-level-extent" id="Record-Types-3">
-<h4 class="subsection"><span>1.9.2 Record Types<a class="copiable-link" href="#Record-Types-3"> &para;</a></span></h4>
+<div class="subsection-level-extent" id="Record-Types-4">
+<h4 class="subsection"><span>1.10.2 Record Types<a class="copiable-link" href="#Record-Types-4"> &para;</a></span></h4>
 
 
 <dl class="first-deftp">
@@ -1585,7 +1678,7 @@ timeout, raises <code class="code">&amp;port-write-timeout-error</code>.  Both c
 <p>
 Next: <a href="#knots_005fweb" accesskey="n" rel="next">(knots web)</a>, Previous: <a href="#knots_005ftimeout" accesskey="p" rel="prev">(knots timeout)</a>, Up: <a href="#API" accesskey="u" rel="up">API</a> &nbsp; [<a href="#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="#Concept-Index" title="Index" rel="index">Index</a>]</p>
 </div>
-<h3 class="section" id="g_t_0028knots-web_002dserver_0029"><span>1.10 (knots web-server)<a class="copiable-link" href="#g_t_0028knots-web_002dserver_0029"> &para;</a></span></h3>
+<h3 class="section" id="g_t_0028knots-web_002dserver_0029"><span>1.11 (knots web-server)<a class="copiable-link" href="#g_t_0028knots-web_002dserver_0029"> &para;</a></span></h3>
 
 
 
@@ -1593,11 +1686,11 @@ Next: <a href="#knots_005fweb" accesskey="n" rel="next">(knots web)</a>, Previou
 
 <ul class="mini-toc">
 <li><a href="#Macros-4" accesskey="1">Macros</a></li>
-<li><a href="#Procedures-9" accesskey="2">Procedures</a></li>
-<li><a href="#Record-Types-4" accesskey="3">Record Types</a></li>
+<li><a href="#Procedures-10" accesskey="2">Procedures</a></li>
+<li><a href="#Record-Types-5" accesskey="3">Record Types</a></li>
 </ul>
 <div class="subsection-level-extent" id="Macros-4">
-<h4 class="subsection"><span>1.10.1 Macros<a class="copiable-link" href="#Macros-4"> &para;</a></span></h4>
+<h4 class="subsection"><span>1.11.1 Macros<a class="copiable-link" href="#Macros-4"> &para;</a></span></h4>
 
 
 <dl class="first-deffn first-defmac-alias-first-deffn">
@@ -1629,8 +1722,8 @@ Next: <a href="#knots_005fweb" accesskey="n" rel="next">(knots web)</a>, Previou
 
 
 </div>
-<div class="subsection-level-extent" id="Procedures-9">
-<h4 class="subsection"><span>1.10.2 Procedures<a class="copiable-link" href="#Procedures-9"> &para;</a></span></h4>
+<div class="subsection-level-extent" id="Procedures-10">
+<h4 class="subsection"><span>1.11.2 Procedures<a class="copiable-link" href="#Procedures-10"> &para;</a></span></h4>
 
 
 <dl class="first-deffn">
@@ -1735,8 +1828,8 @@ procedure being called at any particular time.
 
 
 </div>
-<div class="subsection-level-extent" id="Record-Types-4">
-<h4 class="subsection"><span>1.10.3 Record Types<a class="copiable-link" href="#Record-Types-4"> &para;</a></span></h4>
+<div class="subsection-level-extent" id="Record-Types-5">
+<h4 class="subsection"><span>1.11.3 Record Types<a class="copiable-link" href="#Record-Types-5"> &para;</a></span></h4>
 
 
 <dl class="first-deftp">
@@ -1761,17 +1854,17 @@ procedure being called at any particular time.
 <p>
 Previous: <a href="#knots_005fweb_002dserver" accesskey="p" rel="prev">(knots web-server)</a>, Up: <a href="#API" accesskey="u" rel="up">API</a> &nbsp; [<a href="#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="#Concept-Index" title="Index" rel="index">Index</a>]</p>
 </div>
-<h3 class="section" id="g_t_0028knots-web_0029"><span>1.11 (knots web)<a class="copiable-link" href="#g_t_0028knots-web_0029"> &para;</a></span></h3>
+<h3 class="section" id="g_t_0028knots-web_0029"><span>1.12 (knots web)<a class="copiable-link" href="#g_t_0028knots-web_0029"> &para;</a></span></h3>
 
 
 
 
 
 <ul class="mini-toc">
-<li><a href="#Procedures-10" accesskey="1">Procedures</a></li>
+<li><a href="#Procedures-11" accesskey="1">Procedures</a></li>
 </ul>
-<div class="subsection-level-extent" id="Procedures-10">
-<h4 class="subsection"><span>1.11.1 Procedures<a class="copiable-link" href="#Procedures-10"> &para;</a></span></h4>
+<div class="subsection-level-extent" id="Procedures-11">
+<h4 class="subsection"><span>1.12.1 Procedures<a class="copiable-link" href="#Procedures-11"> &para;</a></span></h4>
 
 
 <dl class="first-deffn">
@@ -1893,6 +1986,7 @@ Next: <a href="#Procedure-Index" accesskey="n" rel="next">Procedure Index</a>, P
 <tr><td colspan="3"><hr></td></tr>
 <tr><th id="Data-Type-Index_tp_symbol-1">&amp;</th></tr>
 <tr><td></td><td class="printindex-index-entry"><a href="#index-_0026knots_002dexception"><code>&amp;knots-exception</code></a></td><td class="printindex-index-section"><a href="#knots">knots</a></td></tr>
+<tr><td></td><td class="printindex-index-entry"><a href="#index-_0026knots_002dexception-1"><code>&amp;knots-exception</code></a></td><td class="printindex-index-section"><a href="#knots_005fbacktraces">knots_backtraces</a></td></tr>
 <tr><td></td><td class="printindex-index-entry"><a href="#index-_0026port_002dread_002dtimeout_002derror"><code>&amp;port-read-timeout-error</code></a></td><td class="printindex-index-section"><a href="#knots_005ftimeout">knots_timeout</a></td></tr>
 <tr><td></td><td class="printindex-index-entry"><a href="#index-_0026port_002dtimeout_002derror"><code>&amp;port-timeout-error</code></a></td><td class="printindex-index-section"><a href="#knots_005ftimeout">knots_timeout</a></td></tr>
 <tr><td></td><td class="printindex-index-entry"><a href="#index-_0026port_002dwrite_002dtimeout_002derror"><code>&amp;port-write-timeout-error</code></a></td><td class="printindex-index-section"><a href="#knots_005ftimeout">knots_timeout</a></td></tr>
@@ -1954,6 +2048,7 @@ Next: <a href="#Variable-Index" accesskey="n" rel="next">Variable Index</a>, Pre
 <tr><td></td><td class="printindex-index-entry"><a href="#index-call_002dwith_002dsigint"><code>call-with-sigint</code></a></td><td class="printindex-index-section"><a href="#knots">knots</a></td></tr>
 <tr><td></td><td class="printindex-index-entry"><a href="#index-call_002dwith_002dtemporary_002dthread"><code>call-with-temporary-thread</code></a></td><td class="printindex-index-section"><a href="#knots">knots</a></td></tr>
 <tr><td></td><td class="printindex-index-entry"><a href="#index-call_002dwith_002dthread"><code>call-with-thread</code></a></td><td class="printindex-index-section"><a href="#knots_005fthread_002dpool">knots_thread-pool</a></td></tr>
+<tr><td></td><td class="printindex-index-entry"><a href="#index-classify_002dstack_002dsituation"><code>classify-stack-situation</code></a></td><td class="printindex-index-section"><a href="#knots_005fbacktraces">knots_backtraces</a></td></tr>
 <tr><td colspan="3"><hr></td></tr>
 <tr><th id="Procedure-Index_fn_letter-D">D</th></tr>
 <tr><td></td><td class="printindex-index-entry"><a href="#index-default_002dwrite_002dresponse_002dexception_002dhandler"><code>default-write-response-exception-handler</code></a></td><td class="printindex-index-section"><a href="#knots_005fweb_002dserver">knots_web-server</a></td></tr>
@@ -1988,7 +2083,9 @@ Next: <a href="#Variable-Index" accesskey="n" rel="next">Variable Index</a>, Pre
 <tr><td colspan="3"><hr></td></tr>
 <tr><th id="Procedure-Index_fn_letter-K">K</th></tr>
 <tr><td></td><td class="printindex-index-entry"><a href="#index-knots_002dexception_002dstack"><code>knots-exception-stack</code></a></td><td class="printindex-index-section"><a href="#knots">knots</a></td></tr>
+<tr><td></td><td class="printindex-index-entry"><a href="#index-knots_002dexception_002dstack-1"><code>knots-exception-stack</code></a></td><td class="printindex-index-section"><a href="#knots_005fbacktraces">knots_backtraces</a></td></tr>
 <tr><td></td><td class="printindex-index-entry"><a href="#index-knots_002dexception_003f"><code>knots-exception?</code></a></td><td class="printindex-index-section"><a href="#knots">knots</a></td></tr>
+<tr><td></td><td class="printindex-index-entry"><a href="#index-knots_002dexception_003f-1"><code>knots-exception?</code></a></td><td class="printindex-index-section"><a href="#knots_005fbacktraces">knots_backtraces</a></td></tr>
 <tr><td colspan="3"><hr></td></tr>
 <tr><th id="Procedure-Index_fn_letter-M">M</th></tr>
 <tr><td></td><td class="printindex-index-entry"><a href="#index-make_002dchunked_002doutput_002dport_002fknots"><code>make-chunked-output-port/knots</code></a></td><td class="printindex-index-section"><a href="#knots_005fweb_002dserver">knots_web-server</a></td></tr>
@@ -1996,6 +2093,7 @@ Next: <a href="#Variable-Index" accesskey="n" rel="next">Variable Index</a>, Pre
 <tr><td></td><td class="printindex-index-entry"><a href="#index-make_002dfixed_002dsize_002dresource_002dpool"><code>make-fixed-size-resource-pool</code></a></td><td class="printindex-index-section"><a href="#knots_005fresource_002dpool">knots_resource-pool</a></td></tr>
 <tr><td></td><td class="printindex-index-entry"><a href="#index-make_002dfixed_002dsize_002dthread_002dpool"><code>make-fixed-size-thread-pool</code></a></td><td class="printindex-index-section"><a href="#knots_005fthread_002dpool">knots_thread-pool</a></td></tr>
 <tr><td></td><td class="printindex-index-entry"><a href="#index-make_002dknots_002dexception"><code>make-knots-exception</code></a></td><td class="printindex-index-section"><a href="#knots">knots</a></td></tr>
+<tr><td></td><td class="printindex-index-entry"><a href="#index-make_002dknots_002dexception-1"><code>make-knots-exception</code></a></td><td class="printindex-index-section"><a href="#knots_005fbacktraces">knots_backtraces</a></td></tr>
 <tr><td></td><td class="printindex-index-entry"><a href="#index-make_002dparallelism_002dlimiter"><code>make-parallelism-limiter</code></a></td><td class="printindex-index-section"><a href="#knots_005fparallelism">knots_parallelism</a></td></tr>
 <tr><td></td><td class="printindex-index-entry"><a href="#index-make_002dresource_002dpool"><code>make-resource-pool</code></a></td><td class="printindex-index-section"><a href="#knots_005fresource_002dpool">knots_resource-pool</a></td></tr>
 <tr><td></td><td class="printindex-index-entry"><a href="#index-make_002dresource_002dpool_002ddestroy_002dresource_002dexception"><code>make-resource-pool-destroy-resource-exception</code></a></td><td class="printindex-index-section"><a href="#knots_005fresource_002dpool">knots_resource-pool</a></td></tr>
@@ -2011,6 +2109,7 @@ Next: <a href="#Variable-Index" accesskey="n" rel="next">Variable Index</a>, Pre
 <tr><td></td><td class="printindex-index-entry"><a href="#index-port_002dtimeout_002derror_003f"><code>port-timeout-error?</code></a></td><td class="printindex-index-section"><a href="#knots_005ftimeout">knots_timeout</a></td></tr>
 <tr><td></td><td class="printindex-index-entry"><a href="#index-port_002dwrite_002dtimeout_002derror_003f"><code>port-write-timeout-error?</code></a></td><td class="printindex-index-section"><a href="#knots_005ftimeout">knots_timeout</a></td></tr>
 <tr><td></td><td class="printindex-index-entry"><a href="#index-print_002dbacktrace_002dand_002dexception_002fknots"><code>print-backtrace-and-exception/knots</code></a></td><td class="printindex-index-section"><a href="#knots">knots</a></td></tr>
+<tr><td></td><td class="printindex-index-entry"><a href="#index-print_002dbacktrace_002dand_002dexception_002fknots-1"><code>print-backtrace-and-exception/knots</code></a></td><td class="printindex-index-section"><a href="#knots_005fbacktraces">knots_backtraces</a></td></tr>
 <tr><td colspan="3"><hr></td></tr>
 <tr><th id="Procedure-Index_fn_letter-R">R</th></tr>
 <tr><td></td><td class="printindex-index-entry"><a href="#index-read_002drequest_002dbody_002fknots"><code>read-request-body/knots</code></a></td><td class="printindex-index-section"><a href="#knots_005fweb_002dserver">knots_web-server</a></td></tr>