[libvirt] [PATCH REPOST] Introduce new OOM testing support

Thursday, 13 February 2014

The previous OOM testing support would re-run the entire "main"
method each iteration, failing a different malloc each time.
When a test suite has 'n' allocations, the number of repeats
requires is  (n * (n + 1) ) / 2.  This gets very large, very
quickly.

This new OOM testing support instead integrates at the
virtTestRun level, so each individual test case gets repeated,
instead of the entire test suite. This means the values of
'n' are orders of magnitude smaller.

The simple usage is

   $ VIR_TEST_OOM=1 ./qemuxml2argvtest
   ...
   29) QEMU XML-2-ARGV clock-utc                                         ... OK
       Test OOM for nalloc=36 .................................... OK
   30) QEMU XML-2-ARGV clock-localtime                                   ... OK
       Test OOM for nalloc=36 .................................... OK
   31) QEMU XML-2-ARGV clock-france                                      ... OK
       Test OOM for nalloc=38 ...................................... OK
   ...

the second lines reports how many mallocs have to be failed, and thus
how many repeats of the test will be run.

If it crashes, then running under valgrind will often show the problem

  $ VIR_TEST_OOM=1 ../run valgrind ./qemuxml2argvtest

When debugging problems it is also helpful to select an individual
test case

  $ VIR_TEST_RANGE=30 VIR_TEST_OOM=1 ../run valgrind ./qemuxml2argvtest

When things get really tricky, it is possible to request that just
specific allocs are failed. eg to fail allocs 5 -> 12, use

  $ VIR_TEST_RANGE=30 VIR_TEST_OOM=1:5-12 ../run valgrind ./qemuxml2argvtest

In the worse case, you might want to know the stack trace of the
alloc which was failed then VIR_TEST_OOM_TRACE can be set. If it
is set to 1 then it will only print if it thinks a mistake happened.
This is often not reliable, so setting it to 2 will make it print
the stack trace for every alloc that is failed.

  $ VIR_TEST_OOM_TRACE=2 VIR_TEST_RANGE=30 VIR_TEST_OOM=1:5-5 ../run valgrind
./qemuxml2argvtest
  30) QEMU XML-2-ARGV clock-localtime                                   ... OK
      Test OOM for nalloc=36 !virAllocN
  /home/berrange/src/virt/libvirt/src/util/viralloc.c:180
  virHashCreateFull
  /home/berrange/src/virt/libvirt/src/util/virhash.c:144
  virDomainDefParseXML
  /home/berrange/src/virt/libvirt/src/conf/domain_conf.c:11745
  virDomainDefParseNode
  /home/berrange/src/virt/libvirt/src/conf/domain_conf.c:12646
  virDomainDefParse
  /home/berrange/src/virt/libvirt/src/conf/domain_conf.c:12590
  testCompareXMLToArgvFiles
  /home/berrange/src/virt/libvirt/tests/qemuxml2argvtest.c:106
  virtTestRun
  /home/berrange/src/virt/libvirt/tests/testutils.c:250
  mymain
  /home/berrange/src/virt/libvirt/tests/qemuxml2argvtest.c:418 (discriminator 2)
  virtTestMain
  /home/berrange/src/virt/libvirt/tests/testutils.c:750
  ??
  ??:0
  _start
  ??:?
   FAILED

Signed-off-by: Daniel P. Berrange <berrange(a)redhat.com&gt;
---
 cfg.mk                            |   2 +-
 docs/internals/oomtesting.html.in | 213 ++++++++++++++++++++++++++++++++++++++
 docs/sitemap.html.in              |   4 +
 tests/qemuargv2xmltest.c          |  14 +--
 tests/qemuxml2argvtest.c          |  12 ++-
 tests/qemuxmlnstest.c             |  18 ++--
 tests/testutils.c                 | 195 +++++++++++++++++++++++++++++++++-
 tests/testutils.h                 |   2 +
 8 files changed, 438 insertions(+), 22 deletions(-)
 create mode 100644 docs/internals/oomtesting.html.in

diff --git a/cfg.mk b/cfg.mk
index 207dfeb..bbc966b 100644
--- a/cfg.mk
+++ b/cfg.mk
@@ -948,7 +948,7 @@ exclude_file_name_regexp--sc_libvirt_unmarked_diagnostics = \
 exclude_file_name_regexp--sc_po_check = ^(docs/|src/rpc/gendispatch\.pl$$)
 
 exclude_file_name_regexp--sc_prohibit_VIR_ERR_NO_MEMORY = \
-  ^(include/libvirt/virterror\.h|daemon/dispatch\.c|src/util/virerror\.c)$$
+ 
^(include/libvirt/virterror\.h|daemon/dispatch\.c|src/util/virerror\.c|docs/internals/oomtesting\.html\.in)$$
 
 exclude_file_name_regexp--sc_prohibit_access_xok = ^src/util/virutil\.c$$
 
diff --git a/docs/internals/oomtesting.html.in b/docs/internals/oomtesting.html.in
new file mode 100644
index 0000000..c5edacf
--- /dev/null
+++ b/docs/internals/oomtesting.html.in
@@ -0,0 +1,213 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
+<html xmlns="http://www.w3.org/1999/xhtml">
+  <body>
+    <h1>Out of memory testing</h1>
+
+    <ul id="toc"></ul>
+
+
+    <p>
+      This page describes how to use the test suite todo out of memory
+      testing.
+    </p>
+
+    <h2>Building with OOM testing</h2>
+
+    <p>
+      Since OOM testing requires hooking into the malloc APIs, it is
+      not enabled by default. The flag <code>--enable-test-oom</code>
+      must be given to <code>configure</code>. When this is done the
+      libvirt allocation APIs will have some hooks enabled.
+    </p>
+
+    <pre>
+$ ./configure --enable-test-oom
+</pre>
+
+
+    <h2><a name="basicoom">Basic OOM testing
support</a></h2>
+
+    <p>
+      The first step in validating OOM usage is to run a test suite
+      with full OOM testing enabled. This is done by setting the
+      <code>VIR_TEST_OOM=1</code> environment variable. The way this
+      works is that it runs the test once normally to "prime" any
+      static memory allocations. Then it runs it once more counting
+      the total number of memory allocations. Then it runs it in a
+      loop failing a different memory allocation each time. For every
+      memory allocation failure triggered, it expects the test case
+      to return an error. OOM testing is quite slow requiring each
+      test case to be executed O(n) times, where 'n' is the total
+      number of memory allocations. This results in a total number
+      of memory allocations of '(n * (n + 1) ) / 2'
+    </p>
+
+    <pre>
+$ VIR_TEST_OOM=1 ./qemuxml2argvtest
+ 1) QEMU XML-2-ARGV minimal                                           ... OK
+    Test OOM for nalloc=42 .......................................... OK
+ 2) QEMU XML-2-ARGV minimal-s390                                      ... OK
+    Test OOM for nalloc=28 ............................ OK
+ 3) QEMU XML-2-ARGV machine-aliases1                                  ... OK
+    Test OOM for nalloc=38 ...................................... OK
+ 4) QEMU XML-2-ARGV machine-aliases2                                  ... OK
+    Test OOM for nalloc=38 ...................................... OK
+ 5) QEMU XML-2-ARGV machine-core-on                                   ... OK
+    Test OOM for nalloc=37 ..................................... OK
+...snip...
+</pre>
+
+    <p>
+      In this output, the first line shows the normal execution and
+      the test number, and the second line shows the total number
+      of memory allocations from that test case.
+    </p>
+
+    <h3><a name="valgrind">Tracking failures with
valgrind</a></h3>
+
+    <p>
+      The test suite should obviously *not* crash during OOM testing.
+      If it does crash, then to assist in tracking down the problem
+      it is worth using valgrind and only running a single test case.
+      For example, supposing test case 5 crashed. Then re-run the
+      test with
+    </p>
+
+    <pre>
+$ VIR_TEST_OOM=1 VIR_TEST_RANGE=5 ../run valgrind ./qemuxml2argvtest
+...snip...
+ 5) QEMU XML-2-ARGV machine-core-on                                   ... OK
+    Test OOM for nalloc=37 ..................................... OK
+...snip...
+    </pre>
+
+    <p>
+      Valgrind should report the cause of the crash - for example a
+      double free or use of uninitialized memory or NULL pointer
+      access.
+    </p>
+
+    <h3><a name="stacktraces">Tracking failures with stack
traces</a></h3>
+
+    <p>
+      With some really difficult bugs valgrind is not sufficient to
+      identify the cause. In this case, it is useful to identify the
+      precise allocation which was failed, to allow the code path
+      to the error to be traced. The <code>VIR_TEST_OOM</code>
+      env variable can be given a range of memory allocations to
+      test. So if a test case has 150 allocations, it can be told
+      to only test allocation numbers 7-10. The
<code>VIR_TEST_OOM_TRACE</code>
+      variable can be used to print out stack traces.
+    </p>
+
+    <pre>
+$ VIR_TEST_OOM_TRACE=2 VIR_TEST_OOM=1:7-10 VIR_TEST_RANGE=5 \
+    ../run valgrind ./qemuxml2argvtest
+ 5) QEMU XML-2-ARGV machine-core-on                                   ... OK
+    Test OOM for nalloc=37 !virAllocN
+/home/berrange/src/virt/libvirt/src/util/viralloc.c:180
+virDomainDefParseXML
+/home/berrange/src/virt/libvirt/src/conf/domain_conf.c:11786 (discriminator 1)
+virDomainDefParseNode
+/home/berrange/src/virt/libvirt/src/conf/domain_conf.c:12677
+virDomainDefParse
+/home/berrange/src/virt/libvirt/src/conf/domain_conf.c:12621
+testCompareXMLToArgvFiles
+/home/berrange/src/virt/libvirt/tests/qemuxml2argvtest.c:107
+virtTestRun
+/home/berrange/src/virt/libvirt/tests/testutils.c:266
+mymain
+/home/berrange/src/virt/libvirt/tests/qemuxml2argvtest.c:388 (discriminator 2)
+virtTestMain
+/home/berrange/src/virt/libvirt/tests/testutils.c:791
+__libc_start_main
+??:?
+_start
+??:?
+!virAlloc
+/home/berrange/src/virt/libvirt/src/util/viralloc.c:133
+virDomainDiskDefParseXML
+/home/berrange/src/virt/libvirt/src/conf/domain_conf.c:4790
+virDomainDefParseXML
+/home/berrange/src/virt/libvirt/src/conf/domain_conf.c:11797
+virDomainDefParseNode
+/home/berrange/src/virt/libvirt/src/conf/domain_conf.c:12677
+virDomainDefParse
+/home/berrange/src/virt/libvirt/src/conf/domain_conf.c:12621
+testCompareXMLToArgvFiles
+/home/berrange/src/virt/libvirt/tests/qemuxml2argvtest.c:107
+virtTestRun
+/home/berrange/src/virt/libvirt/tests/testutils.c:266
+mymain
+/home/berrange/src/virt/libvirt/tests/qemuxml2argvtest.c:388 (discriminator 2)
+virtTestMain
+/home/berrange/src/virt/libvirt/tests/testutils.c:791
+__libc_start_main
+??:?
+_start
+??:?
+!virAllocN
+/home/berrange/src/virt/libvirt/src/util/viralloc.c:180
+virXPathNodeSet
+/home/berrange/src/virt/libvirt/src/util/virxml.c:609
+virDomainDefParseXML
+/home/berrange/src/virt/libvirt/src/conf/domain_conf.c:11805
+virDomainDefParseNode
+/home/berrange/src/virt/libvirt/src/conf/domain_conf.c:12677
+virDomainDefParse
+/home/berrange/src/virt/libvirt/src/conf/domain_conf.c:12621
+testCompareXMLToArgvFiles
+/home/berrange/src/virt/libvirt/tests/qemuxml2argvtest.c:107
+virtTestRun
+/home/berrange/src/virt/libvirt/tests/testutils.c:266
+mymain
+/home/berrange/src/virt/libvirt/tests/qemuxml2argvtest.c:388 (discriminator 2)
+virtTestMain
+/home/berrange/src/virt/libvirt/tests/testutils.c:791
+__libc_start_main
+??:?
+_start
+??:?
+!virAllocN
+/home/berrange/src/virt/libvirt/src/util/viralloc.c:180
+virDomainDefParseXML
+/home/berrange/src/virt/libvirt/src/conf/domain_conf.c:11808 (discriminator 1)
+virDomainDefParseNode
+/home/berrange/src/virt/libvirt/src/conf/domain_conf.c:12677
+virDomainDefParse
+/home/berrange/src/virt/libvirt/src/conf/domain_conf.c:12621
+testCompareXMLToArgvFiles
+/home/berrange/src/virt/libvirt/tests/qemuxml2argvtest.c:107
+virtTestRun
+/home/berrange/src/virt/libvirt/tests/testutils.c:266
+mymain
+/home/berrange/src/virt/libvirt/tests/qemuxml2argvtest.c:388 (discriminator 2)
+virtTestMain
+/home/berrange/src/virt/libvirt/tests/testutils.c:791
+__libc_start_main
+??:?
+_start
+??:?
+    </pre>
+
+    <h3><a name="noncrash">Non-crash related
problems</a></h3>
+
+    <p>
+      Not all memory allocation bugs result in code crashing. Sometimes
+      the code will be silently ignoring the allocation failure, resulting
+      in incorrect data being produced. For example the XML parser may
+      mistakenly treat an allocation failure as indicating that an XML
+      attribute was not set in the input document. It is hard to identify
+      these problems from the test suite automatically. For this, the
+      test suites should be run with <code>VIR_TEST_DEBUG=1</code> set
+      and then stderr analysed for any unexpected data. For example,
+      the XML conversion may show an embedded "(null)" literal, or the
+      test suite might complain about missing elements / attributes
+      in the actual vs expected data. These are all signs of bugs in
+      OOM handling. In the future the OOM tests will be enhanced to
+      validate that an error VIR_ERR_NO_MEMORY is returned for each
+      allocation failed, rather than some other error.
+    </p>
+  </body>
+</html>
diff --git a/docs/sitemap.html.in b/docs/sitemap.html.in
index 08c2fbd..7d0610b 100644
--- a/docs/sitemap.html.in
+++ b/docs/sitemap.html.in
@@ -342,6 +342,10 @@
                 <a href="internals/locking.html">Lock managers</a>
                 <span>Use lock managers to protect disk content</span>
               </li>
+              <li>
+                <a href="internals/oomtesting.html">Out of memory
testing</a>
+                <span>Simulating OOM conditions in the test suite</span>
+              </li>
             </ul>
           </li>
           <li>
diff --git a/tests/qemuargv2xmltest.c b/tests/qemuargv2xmltest.c
index 1b13fcc..e75c85d 100644
--- a/tests/qemuargv2xmltest.c
+++ b/tests/qemuargv2xmltest.c
@@ -42,7 +42,6 @@ static int testCompareXMLToArgvFiles(const char *xml,
     char *cmd = NULL;
     int ret = -1;
     virDomainDefPtr vmdef = NULL;
-    char *log;
 
     if (virtTestLoadFile(cmdfile, &cmd) < 0)
         goto fail;
@@ -53,13 +52,16 @@ static int testCompareXMLToArgvFiles(const char *xml,
                                              cmd, NULL, NULL, NULL)))
         goto fail;
 
-    if ((log = virtTestLogContentAndReset()) == NULL)
-        goto fail;
-    if ((*log != '\0') != expect_warning) {
+    if (!virtTestOOMActive()) {
+        char *log;
+        if ((log = virtTestLogContentAndReset()) == NULL)
+            goto fail;
+        if ((*log != '\0') != expect_warning) {
+            VIR_FREE(log);
+            goto fail;
+        }
         VIR_FREE(log);
-        goto fail;
     }
-    VIR_FREE(log);
 
     if (!virDomainDefCheckABIStability(vmdef, vmdef)) {
         fprintf(stderr, "ABI stability check failed on %s", xml);
diff --git a/tests/qemuxml2argvtest.c b/tests/qemuxml2argvtest.c
index 7a5b50d..26d63d3 100644
--- a/tests/qemuxml2argvtest.c
+++ b/tests/qemuxml2argvtest.c
@@ -284,7 +284,8 @@ static int testCompareXMLToArgvFiles(const char *xml,
     if (!(vmdef = virDomainDefParseFile(xml, driver.caps, driver.xmlopt,
                                         QEMU_EXPECTED_VIRT_TYPES,
                                         VIR_DOMAIN_XML_INACTIVE))) {
-        if (flags & FLAG_EXPECT_PARSE_ERROR)
+        if (!virtTestOOMActive() &&
+            (flags & FLAG_EXPECT_PARSE_ERROR))
             goto ok;
         goto out;
     }
@@ -357,7 +358,8 @@ static int testCompareXMLToArgvFiles(const char *xml,
                                      migrateFrom, migrateFd, NULL,
                                      VIR_NETDEV_VPORT_PROFILE_OP_NO_OP,
                                      &testCallbacks))) {
-        if (flags & FLAG_EXPECT_FAILURE) {
+        if (!virtTestOOMActive() &&
+            (flags & FLAG_EXPECT_FAILURE)) {
             ret = 0;
             if (virTestGetDebug() > 1)
                 fprintf(stderr, "Got expected error: %s\n",
@@ -371,7 +373,8 @@ static int testCompareXMLToArgvFiles(const char *xml,
         goto out;
     }
 
-    if (!!virGetLastError() != !!(flags & FLAG_EXPECT_ERROR)) {
+    if (!virtTestOOMActive() &&
+        (!!virGetLastError() != !!(flags & FLAG_EXPECT_ERROR))) {
         if (virTestGetDebug() && (log = virtTestLogContentAndReset()))
             fprintf(stderr, "\n%s", log);
         goto out;
@@ -392,7 +395,8 @@ static int testCompareXMLToArgvFiles(const char *xml,
     }
 
  ok:
-    if (flags & FLAG_EXPECT_ERROR) {
+    if (!virtTestOOMActive() &&
+        (flags & FLAG_EXPECT_ERROR)) {
         /* need to suppress the errors */
         virResetLastError();
     }
diff --git a/tests/qemuxmlnstest.c b/tests/qemuxmlnstest.c
index 9426bf7..20a5ccd 100644
--- a/tests/qemuxmlnstest.c
+++ b/tests/qemuxmlnstest.c
@@ -122,15 +122,17 @@ static int testCompareXMLToArgvFiles(const char *xml,
                                      &testCallbacks)))
         goto fail;
 
-    if (!!virGetLastError() != expectError) {
-        if (virTestGetDebug() && (log = virtTestLogContentAndReset()))
-            fprintf(stderr, "\n%s", log);
-        goto fail;
-    }
+    if (!virtTestOOMActive()) {
+        if (!!virGetLastError() != expectError) {
+            if (virTestGetDebug() && (log = virtTestLogContentAndReset()))
+                fprintf(stderr, "\n%s", log);
+            goto fail;
+        }
 
-    if (expectError) {
-        /* need to suppress the errors */
-        virResetLastError();
+        if (expectError) {
+            /* need to suppress the errors */
+            virResetLastError();
+        }
     }
 
     if (!(actualargv = virCommandToString(cmd)))
diff --git a/tests/testutils.c b/tests/testutils.c
index 32fe374..52d07eb 100644
--- a/tests/testutils.c
+++ b/tests/testutils.c
@@ -47,6 +47,13 @@
 #include "virprocess.h"
 #include "virstring.h"
 
+#ifdef TEST_OOM
+# ifdef TEST_OOM_TRACE
+#  include <dlfcn.h>
+#  include <execinfo.h>
+# endif
+#endif
+
 #ifdef HAVE_PATHS_H
 # include <paths.h>
 #endif
@@ -64,12 +71,37 @@ static unsigned int testDebug = -1;
 static unsigned int testVerbose = -1;
 static unsigned int testExpensive = -1;
 
+#ifdef TEST_OOM
+static unsigned int testOOM = 0;
+static unsigned int testOOMStart = -1;
+static unsigned int testOOMEnd = -1;
+static unsigned int testOOMTrace = 0;
+# ifdef TEST_OOM_TRACE
+void *testAllocStack[30];
+int ntestAllocStack;
+# endif
+#endif
+static bool testOOMActive = false;
+
 static size_t testCounter = 0;
 static size_t testStart = 0;
 static size_t testEnd = 0;
 
 char *progname;
 
+bool virtTestOOMActive(void)
+{
+    return testOOMActive;
+}
+
+#ifdef TEST_OOM_TRACE
+static void virTestAllocHook(int nalloc ATTRIBUTE_UNUSED,
+                             void *opaque ATTRIBUTE_UNUSED)
+{
+    ntestAllocStack = backtrace(testAllocStack, ARRAY_CARDINALITY(testAllocStack));
+}
+#endif
+
 void virtTestResult(const char *name, int ret, const char *msg, ...)
 {
     va_list vargs;
@@ -108,6 +140,35 @@ void virtTestResult(const char *name, int ret, const char *msg, ...)
     va_end(vargs);
 }
 
+#ifdef TEST_OOM_TRACE
+static void
+virTestShowTrace(void)
+{
+    size_t j;
+    for (j = 2; j < ntestAllocStack; j++) {
+        Dl_info info;
+        char *cmd;
+
+        dladdr(testAllocStack[j], &info);
+        if (info.dli_fname &&
+            strstr(info.dli_fname, ".so")) {
+            if (virAsprintf(&cmd, "addr2line -f -e %s %p",
+                            info.dli_fname,
+                            ((void*)((unsigned long long)testAllocStack[j]
+                                     - (unsigned long long)info.dli_fbase))) < 0)
+                continue;
+        } else {
+            if (virAsprintf(&cmd, "addr2line -f -e %s %p",
+                            (char*)(info.dli_fname ? info.dli_fname :
"<unknown>"),
+                            testAllocStack[j]) < 0)
+                continue;
+        }
+        ignore_value(system(cmd));
+        VIR_FREE(cmd);
+    }
+}
+#endif
+
 /*
  * Runs test
  *
@@ -154,7 +215,7 @@ virtTestRun(const char *title,
             !((testCounter-1) % 40)) {
             fprintf(stderr, " %-3zu\n", (testCounter-1));
             fprintf(stderr, "      ");
-            }
+        }
         if (ret == 0)
                 fprintf(stderr, ".");
         else if (ret == EXIT_AM_SKIP)
@@ -163,6 +224,77 @@ virtTestRun(const char *title,
             fprintf(stderr, "!");
     }
 
+#ifdef TEST_OOM
+    if (testOOM && ret != EXIT_AM_SKIP) {
+        int nalloc;
+        int oomret;
+        int start, end;
+        size_t i;
+        virResetLastError();
+        virAllocTestInit();
+# ifdef TEST_OOM_TRACE
+        virAllocTestHook(virTestAllocHook, NULL);
+# endif
+        oomret = body(data);
+        nalloc = virAllocTestCount();
+        fprintf(stderr, "    Test OOM for nalloc=%d ", nalloc);
+        if (testOOMStart == -1 ||
+            testOOMEnd == -1) {
+            start = 0;
+            end = nalloc;
+        } else {
+            start = testOOMStart;
+            end = testOOMEnd + 1;
+        }
+        testOOMActive = true;
+        for (i = start; i < end; i++) {
+            bool missingFail = false;
+# ifdef TEST_OOM_TRACE
+            memset(testAllocStack, 0, ARRAY_CARDINALITY(testAllocStack));
+            ntestAllocStack = 0;
+# endif
+            virAllocTestOOM(i + 1, 1);
+            oomret = body(data);
+
+            /* fprintf() disabled because XML parsing APIs don't allow
+             * distinguish between element / attribute not present
+             * in the XML (which is non-fatal), vs OOM / malformed
+             * which should be fatal. Thus error reporting for
+             * optionally present XML is mostly broken.
+             */
+            if (oomret == 0) {
+                missingFail = true;
+# if 0
+                fprintf(stderr, " alloc %zu failed but no err status\n", i +
1);
+# endif
+            } else {
+                virErrorPtr lerr = virGetLastError();
+                if (!lerr) {
+# if 0
+                    fprintf(stderr, " alloc %zu failed but no error report\n",
i + 1);
+# endif
+                    missingFail = true;
+                }
+            }
+            if ((missingFail && testOOMTrace) || (testOOMTrace > 1)) {
+                fprintf(stderr, "%s", "!");
+# ifdef TEST_OOM_TRACE
+                virTestShowTrace();
+# endif
+                ret = -1;
+            } else {
+                fprintf(stderr, "%s", ".");
+            }
+        }
+        testOOMActive = false;
+        if (ret == 0)
+            fprintf(stderr, " OK\n");
+        else
+            fprintf(stderr, " FAILED\n");
+        virAllocTestInit();
+    }
+#endif /* TEST_OOM */
+
     return ret;
 }
 
@@ -191,7 +323,6 @@ virtTestLoadFile(const char *file, char **buf)
     tmplen = buflen = st.st_size + 1;
 
     if (VIR_ALLOC_N(*buf, buflen) < 0) {
-        fprintf(stderr, "%s: larger than available memory (> %d)\n", file,
buflen);
         VIR_FORCE_FCLOSE(fp);
         return -1;
     }
@@ -467,7 +598,8 @@ virtTestLogOutput(virLogSource source ATTRIBUTE_UNUSED,
 {
     struct virtTestLogData *log = data;
     virCheckFlags(VIR_LOG_STACK_TRACE,);
-    virBufferAsprintf(&log->buf, "%s: %s", timestamp, str);
+    if (!testOOMActive)
+        virBufferAsprintf(&log->buf, "%s: %s", timestamp, str);
 }
 
 static void
@@ -535,6 +667,9 @@ int virtTestMain(int argc,
 {
     int ret;
     char *testRange = NULL;
+#ifdef TEST_OOM
+    char *oomstr;
+#endif
 
     if (!virFileExists(abs_srcdir))
         return EXIT_AM_HARDFAIL;
@@ -590,6 +725,60 @@ int virtTestMain(int argc,
         }
     }
 
+#ifdef TEST_OOM
+    if ((oomstr = getenv("VIR_TEST_OOM")) != NULL) {
+        char *next;
+        if (testDebug == -1)
+            testDebug = 1;
+        testOOM = 1;
+        if (oomstr[0] != '\0' &&
+            oomstr[1] == ':') {
+            if (virStrToLong_ui(oomstr + 2, &next, 10, &testOOMStart) < 0) {
+                fprintf(stderr, "Cannot parse range %s\n", oomstr);
+                return EXIT_FAILURE;
+            }
+            if (*next == '\0') {
+                testOOMEnd = testOOMStart;
+            } else {
+                if (*next != '-') {
+                    fprintf(stderr, "Cannot parse range %s\n", oomstr);
+                    return EXIT_FAILURE;
+                }
+                if (virStrToLong_ui(next+1, NULL, 10, &testOOMEnd) < 0) {
+                    fprintf(stderr, "Cannot parse range %s\n", oomstr);
+                    return EXIT_FAILURE;
+                }
+            }
+        } else {
+            testOOMStart = -1;
+            testOOMEnd = -1;
+        }
+    }
+
+# ifdef TEST_OOM_TRACE
+    if ((oomstr = getenv("VIR_TEST_OOM_TRACE")) != NULL) {
+        if (virStrToLong_ui(oomstr, NULL, 10, &testOOMTrace) < 0) {
+            fprintf(stderr, "Cannot parse oom trace %s\n", oomstr);
+            return EXIT_FAILURE;
+        }
+    }
+# else
+    if (getenv("VIR_TEST_OOM_TRACE")) {
+        fprintf(stderr, "%s", "OOM test tracing not enabled in this
build\n");
+        return EXIT_FAILURE;
+    }
+# endif
+#else /* TEST_OOM */
+    if (getenv("VIR_TEST_OOM")) {
+        fprintf(stderr, "%s", "OOM testing not enabled in this
build\n");
+        return EXIT_FAILURE;
+    }
+    if (getenv("VIR_TEST_OOM_TRACE")) {
+        fprintf(stderr, "%s", "OOM test tracing not enabled in this
build\n");
+        return EXIT_FAILURE;
+    }
+#endif /* TEST_OOM */
+
     ret = (func)();
 
     virResetLastError();
diff --git a/tests/testutils.h b/tests/testutils.h
index 674d3df..29eb9d9 100644
--- a/tests/testutils.h
+++ b/tests/testutils.h
@@ -44,6 +44,8 @@ extern char *progname;
 #  error Fix Makefile.am
 # endif
 
+bool virtTestOOMActive(void);
+
 void virtTestResult(const char *name, int ret, const char *msg, ...)
     ATTRIBUTE_FMT_PRINTF(3,4);
 int virtTestRun(const char *title,
-- 
1.8.5.3


    

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