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From: <sv...@va...> - 2009-11-11 19:22:15
|
Author: bart Date: 2009-11-11 19:22:05 +0000 (Wed, 11 Nov 2009) New Revision: 10937 Log: Fixed typo. Modified: trunk/configure.in Modified: trunk/configure.in =================================================================== --- trunk/configure.in 2009-11-10 15:11:30 UTC (rev 10936) +++ trunk/configure.in 2009-11-11 19:22:05 UTC (rev 10937) @@ -1757,7 +1757,7 @@ # Test for QAtomicInt, which has been introduced in Qt 4.4. # See also http://doc.trolltech.com/4.4/qatomicint.html. if test x$ac_have_qtcore = xyes; then - AC_MSG_CHECKING([for Qt4 QAtomicInt)]) + AC_MSG_CHECKING([for Qt4 QAtomicInt]) AC_LANG(C++) safe_CXXFLAGS="${CXXFLAGS}" CXXFLAGS="${QTCORE_CFLAGS} $mflag_primary" |
|
From: Bart V. A. <bar...@gm...> - 2009-11-11 08:51:12
|
Nightly build on cellbuzz-native ( cellbuzz, ppc64, Fedora 7, native ) Started at 2009-11-11 02:24:01 EST Ended at 2009-11-11 03:50:48 EST Results unchanged from 24 hours ago Checking out valgrind source tree ... done Configuring valgrind ... done Building valgrind ... done Running regression tests ... done Regression test results follow == 449 tests, 45 stderr failures, 10 stdout failures, 0 post failures == memcheck/tests/deep_templates (stdout) memcheck/tests/leak-cases-full (stderr) memcheck/tests/leak-cases-summary (stderr) memcheck/tests/leak-cycle (stderr) memcheck/tests/linux/timerfd-syscall (stdout) memcheck/tests/linux-syscalls-2007 (stderr) memcheck/tests/origin5-bz2 (stderr) memcheck/tests/partiallydefinedeq (stderr) memcheck/tests/varinfo1 (stderr) memcheck/tests/varinfo2 (stderr) memcheck/tests/varinfo3 (stderr) memcheck/tests/varinfo4 (stderr) memcheck/tests/varinfo5 (stderr) memcheck/tests/varinfo6 (stderr) memcheck/tests/wrap8 (stdout) memcheck/tests/wrap8 (stderr) none/tests/empty-exe (stderr) none/tests/linux/mremap (stderr) none/tests/ppc32/jm-fp (stdout) none/tests/ppc32/jm-vmx (stdout) none/tests/ppc32/round (stdout) none/tests/ppc32/test_gx (stdout) none/tests/ppc64/jm-fp (stdout) none/tests/ppc64/jm-vmx (stdout) none/tests/ppc64/round (stdout) none/tests/shell_valid2 (stderr) none/tests/shell_valid3 (stderr) none/tests/shell_zerolength (stderr) helgrind/tests/hg05_race2 (stderr) helgrind/tests/tc06_two_races_xml (stderr) helgrind/tests/tc22_exit_w_lock (stderr) helgrind/tests/tc23_bogus_condwait (stderr) drd/tests/tc23_bogus_condwait (stderr) exp-ptrcheck/tests/bad_percentify (stderr) exp-ptrcheck/tests/base (stderr) exp-ptrcheck/tests/ccc (stderr) exp-ptrcheck/tests/fp (stderr) exp-ptrcheck/tests/globalerr (stderr) exp-ptrcheck/tests/hackedbz2 (stderr) exp-ptrcheck/tests/hp_bounds (stderr) exp-ptrcheck/tests/hp_dangle (stderr) exp-ptrcheck/tests/hsg (stderr) exp-ptrcheck/tests/justify (stderr) exp-ptrcheck/tests/partial_bad (stderr) exp-ptrcheck/tests/partial_good (stderr) exp-ptrcheck/tests/preen_invars (stderr) exp-ptrcheck/tests/pth_create (stderr) exp-ptrcheck/tests/pth_specific (stderr) exp-ptrcheck/tests/realloc (stderr) exp-ptrcheck/tests/stackerr (stderr) exp-ptrcheck/tests/strcpy (stderr) exp-ptrcheck/tests/supp (stderr) exp-ptrcheck/tests/tricky (stderr) exp-ptrcheck/tests/unaligned (stderr) exp-ptrcheck/tests/zero (stderr) |
|
From: Julian S. <js...@ac...> - 2009-11-11 07:49:35
|
On Tuesday 10 November 2009, Konstantin Serebryany wrote: > Hi, > > Memcheck reports uninitialized reads (UMRs) only when the reads cause side > effects (e.g. cmp, syscall, etc). Yes. So it's not really reporting reads of uninitialised memory; rather it's reporting dangerous uses of uninitialised values. > This cases the implementation to be complex and slow, especially if we need > to have --track-origins=yes. > > Other tools choose to report UMRs on any first access, including move. > This is much simpler and faster, but leads to numerous false positives > (e.g. when copying structures with padding bytes). > > I wonder if these two approaches where discussed and compared somewhere in > literature. I don't know of any. I too would be interested to read more about it. Personally I don't believe it's possible to have an (essentially) zero false positive rate without using an approach like Memcheck's. But I would love to be proved wrong on this, since I too don't like Memcheck's complexity and overhead. J |
|
From: John R. <jr...@bi...> - 2009-11-11 04:39:41
|
> Other tools choose to report UMRs on any first access, including move. > This is much simpler and faster, but leads to numerous false positives > (e.g. when copying structures with padding bytes). There are programming ecosystems in which that is not a "false positive." It is an actual demerit with a real monetary cost. Some software creators must purchase product liability insurance. Some insurance companies offer a discount if the code passes tests which show that no uninitialized bits ever are fetched from memory. Any hole in a structure is avoided, documented, and/or filled deliberately. "Complain immediately upon fetch" sometimes dramatically shortens the search for the cause of a mysterious UMR. The feature "--track-origins=yes" can be viewed as an intermediate strategy between delayed versus immediate complaints. -- |
|
From: Tom H. <th...@cy...> - 2009-11-11 03:50:43
|
Nightly build on vauxhall ( x86_64, Fedora 11 ) Started at 2009-11-11 03:20:06 GMT Ended at 2009-11-11 03:50:24 GMT Results differ from 24 hours ago Checking out valgrind source tree ... done Configuring valgrind ... done Building valgrind ... done Running regression tests ... failed Regression test results follow == 541 tests, 9 stderr failures, 0 stdout failures, 0 post failures == memcheck/tests/linux/stack_switch (stderr) memcheck/tests/long_namespace_xml (stderr) helgrind/tests/pth_spinlock (stderr) helgrind/tests/tc06_two_races_xml (stderr) helgrind/tests/tc20_verifywrap (stderr) helgrind/tests/tc23_bogus_condwait (stderr) drd/tests/qt4_mutex (stderr) drd/tests/qt4_rwlock (stderr) exp-ptrcheck/tests/bad_percentify (stderr) ================================================= == Results from 24 hours ago == ================================================= Checking out valgrind source tree ... done Configuring valgrind ... done Building valgrind ... done Running regression tests ... failed Regression test results follow == 541 tests, 8 stderr failures, 0 stdout failures, 0 post failures == memcheck/tests/linux/stack_switch (stderr) memcheck/tests/long_namespace_xml (stderr) helgrind/tests/tc06_two_races_xml (stderr) helgrind/tests/tc20_verifywrap (stderr) helgrind/tests/tc23_bogus_condwait (stderr) drd/tests/qt4_mutex (stderr) drd/tests/qt4_rwlock (stderr) exp-ptrcheck/tests/bad_percentify (stderr) ================================================= == Difference between 24 hours ago and now == ================================================= *** old.short Wed Nov 11 03:35:20 2009 --- new.short Wed Nov 11 03:50:24 2009 *************** *** 8,12 **** ! == 541 tests, 8 stderr failures, 0 stdout failures, 0 post failures == memcheck/tests/linux/stack_switch (stderr) memcheck/tests/long_namespace_xml (stderr) helgrind/tests/tc06_two_races_xml (stderr) --- 8,13 ---- ! == 541 tests, 9 stderr failures, 0 stdout failures, 0 post failures == memcheck/tests/linux/stack_switch (stderr) memcheck/tests/long_namespace_xml (stderr) + helgrind/tests/pth_spinlock (stderr) helgrind/tests/tc06_two_races_xml (stderr) |
|
From: Tom H. <th...@cy...> - 2009-11-11 03:49:23
|
Nightly build on lloyd ( x86_64, Fedora 7 ) Started at 2009-11-11 03:05:06 GMT Ended at 2009-11-11 03:49:10 GMT Results unchanged from 24 hours ago Checking out valgrind source tree ... done Configuring valgrind ... done Building valgrind ... done Running regression tests ... failed Regression test results follow == 531 tests, 1 stderr failure, 0 stdout failures, 0 post failures == helgrind/tests/tc06_two_races_xml (stderr) |
|
From: Tom H. <th...@cy...> - 2009-11-11 03:36:02
|
Nightly build on mg ( x86_64, Fedora 9 ) Started at 2009-11-11 03:10:09 GMT Ended at 2009-11-11 03:35:38 GMT Results unchanged from 24 hours ago Checking out valgrind source tree ... done Configuring valgrind ... done Building valgrind ... done Running regression tests ... failed Regression test results follow == 538 tests, 1 stderr failure, 0 stdout failures, 0 post failures == helgrind/tests/tc06_two_races_xml (stderr) |
|
From: Nicholas N. <n.n...@gm...> - 2009-11-11 03:00:59
|
On Tue, Nov 10, 2009 at 7:46 PM, Konstantin Serebryany <kon...@gm...> wrote: > Hi, > Memcheck reports uninitialized reads (UMRs) only when the reads cause side > effects (e.g. cmp, syscall, etc). > This cases the implementation to be complex and slow, especially if we need > to have --track-origins=yes. > Other tools choose to report UMRs on any first access, including move. > This is much simpler and faster, but leads to numerous false positives (e.g. > when copying structures with padding bytes). > I wonder if these two approaches where discussed and compared somewhere in > literature. Only one I can think of is our Usenix 2005 paper, which is on the Valgrind website. It doesn't go into much more detail about the trade-offs than what you've written above. Nick |