https://gcc.gnu.org/bugzilla/show_bug.cgi?id=121593
--- Comment #10 from Marc Mutz <marc.mutz at hotmail dot com> ---
> Also I am trying to understand which version has the bug? The one without the
> patch (and with `__attribute__((optimize("O0"))` removed) or the one with the
> patch (and with `__attribute__((optimize("O0"))` removed)?
- inline (the .7z) works fine
- guarded (.7z + inline-to-guarded.diff applied) works fine, too
- guarded - __attribute__((optimize("O0"))) hangs (with 100% CPU)
> Does changing `optimize("O0")` to noipa help fix the issue?
Yes, that fixes the issue (at least on 15.2.1, didn't check the others).
> Also which function is the hang in? Is it in
> QXmlStreamWriterPrivate::writeEscaped or something else?
It's writeEscaped, yes.
> noinline
Bingo, that creates a Valgrind report:
```
==1794237== Use of uninitialised value of size 8
==1794237== at 0x4E27206: char32_t
QUtf8Functions::nextCharacterFromUtf8<QUtf8BaseTraits>(qchar8_t const*&,
qchar8_t const*, char32_t) [clone .constprop.0] (in
/home/marc/Qt/qtbase-submit-build/lib/libQt6Core.so.6.11.0)
==1794237== by 0x4E2CE6F:
QXmlStreamWriterPrivate::writeEscaped(QAnyStringView, bool) (in
/home/marc/Qt/qtbase-submit-build/lib/libQt6Core.so.6.11.0)
==1794237== by 0x4E2E563: QXmlStreamWriter::writeAttribute(QAnyStringView,
QAnyStringView) (in /home/marc/Qt/qtbase-submit-build/lib/libQt6Core.so.6.11.0)
==1794237== by 0x1344B5: tst_QXmlStream::writerAutoEmptyTags() const (in
/home/marc/Qt/qtbase-submit-build/tests/auto/corelib/serialization/qxmlstream/tst_qxmlstream)
==1794237== by 0x4CAF150: QMetaMethodInvoker::invokeImpl(QMetaMethod, void*,
Qt::ConnectionType, long long, void const* const*, char const* const*,
QtPrivate::QMetaTypeInterface const* const*) (in
/home/marc/Qt/qtbase-submit-build/lib/libQt6Core.so.6.11.0)
==1794237== by 0x4CAFCC6: QMetaMethod::invokeImpl(QMetaMethod, void*,
Qt::ConnectionType, long long, void const* const*, char const* const*,
QtPrivate::QMetaTypeInterface const* const*) (in
/home/marc/Qt/qtbase-submit-build/lib/libQt6Core.so.6.11.0)
==1794237== by 0x4A9AFD9: QTest::invokeTestMethodIfValid(QMetaMethod,
QObject*) (in /home/marc/Qt/qtbase-submit-build/lib/libQt6Test.so.6.11.0)
==1794237== by 0x4AA3686: QTest::TestMethods::invokeTestOnData(int) const
(in /home/marc/Qt/qtbase-submit-build/lib/libQt6Test.so.6.11.0)
==1794237== by 0x4AA464D: QTest::TestMethods::invokeTest(int, QLatin1String,
std::optional<QTest::WatchDog>&) const (in
/home/marc/Qt/qtbase-submit-build/lib/libQt6Test.so.6.11.0)
==1794237== by 0x4AA50F9: QTest::TestMethods::invokeTests(QObject*) const
(in /home/marc/Qt/qtbase-submit-build/lib/libQt6Test.so.6.11.0)
==1794237== by 0x4AA5CB7: QTest::qRun() (in
/home/marc/Qt/qtbase-submit-build/lib/libQt6Test.so.6.11.0)
==1794237== by 0x4AA5EF1: QTest::qExec(QObject*, int, char**) (in
/home/marc/Qt/qtbase-submit-build/lib/libQt6Test.so.6.11.0)
==1794237==
==1794237== Invalid read of size 1
==1794237== at 0x4E27206: char32_t
QUtf8Functions::nextCharacterFromUtf8<QUtf8BaseTraits>(qchar8_t const*&,
qchar8_t const*, char32_t) [clone .constprop.0] (in
/home/marc/Qt/qtbase-submit-build/lib/libQt6Core.so.6.11.0)
==1794237== by 0x4E2CE6F:
QXmlStreamWriterPrivate::writeEscaped(QAnyStringView, bool) (in
/home/marc/Qt/qtbase-submit-build/lib/libQt6Core.so.6.11.0)
==1794237== by 0x4E2E563: QXmlStreamWriter::writeAttribute(QAnyStringView,
QAnyStringView) (in /home/marc/Qt/qtbase-submit-build/lib/libQt6Core.so.6.11.0)
==1794237== by 0x1344B5: tst_QXmlStream::writerAutoEmptyTags() const (in
/home/marc/Qt/qtbase-submit-build/tests/auto/corelib/serialization/qxmlstream/tst_qxmlstream)
==1794237== by 0x4CAF150: QMetaMethodInvoker::invokeImpl(QMetaMethod, void*,
Qt::ConnectionType, long long, void const* const*, char const* const*,
QtPrivate::QMetaTypeInterface const* const*) (in
/home/marc/Qt/qtbase-submit-build/lib/libQt6Core.so.6.11.0)
==1794237== by 0x4CAFCC6: QMetaMethod::invokeImpl(QMetaMethod, void*,
Qt::ConnectionType, long long, void const* const*, char const* const*,
QtPrivate::QMetaTypeInterface const* const*) (in
/home/marc/Qt/qtbase-submit-build/lib/libQt6Core.so.6.11.0)
==1794237== by 0x4A9AFD9: QTest::invokeTestMethodIfValid(QMetaMethod,
QObject*) (in /home/marc/Qt/qtbase-submit-build/lib/libQt6Test.so.6.11.0)
==1794237== by 0x4AA3686: QTest::TestMethods::invokeTestOnData(int) const
(in /home/marc/Qt/qtbase-submit-build/lib/libQt6Test.so.6.11.0)
==1794237== by 0x4AA464D: QTest::TestMethods::invokeTest(int, QLatin1String,
std::optional<QTest::WatchDog>&) const (in
/home/marc/Qt/qtbase-submit-build/lib/libQt6Test.so.6.11.0)
==1794237== by 0x4AA50F9: QTest::TestMethods::invokeTests(QObject*) const
(in /home/marc/Qt/qtbase-submit-build/lib/libQt6Test.so.6.11.0)
==1794237== by 0x4AA5CB7: QTest::qRun() (in
/home/marc/Qt/qtbase-submit-build/lib/libQt6Test.so.6.11.0)
==1794237== by 0x4AA5EF1: QTest::qExec(QObject*, int, char**) (in
/home/marc/Qt/qtbase-submit-build/lib/libQt6Test.so.6.11.0)
==1794237== Address 0x1 is not stack'd, malloc'd or (recently) free'd
==1794237==
Received signal 11 (SIGSEGV), code SEGV_MAPERR, at instruction address
0x0000000004e27206, accessing address 0x0000000000000001
writerAutoEmptyTags function time: 16ms, total time: 1871ms
=== Stack trace ===
[New LWP 1794255]
0x00000000580f5eb7 in ?? ()
0x4e27206: movzbl (%rcx),%edx
Thread 2 (LWP 1794255):
#0 0x00000000580f5eb7 in ?? ()
#1 0x00000000580a8a70 in ?? ()
#2 0x00000000580a4d6b in ?? ()
#3 0x00000000580a65aa in ?? ()
#4 0x00000000580f5fd5 in ?? ()
#5 0x00000000580f62d1 in ?? ()
#6 0x00000000580b88ee in ?? ()
#7 0xdeadbeefdeadbeef in ?? ()
#8 0xdeadbeefdeadbeef in ?? ()
#9 0xdeadbeefdeadbeef in ?? ()
#10 0xdeadbeefdeadbeef in ?? ()
#11 0x0000000000000000 in ?? ()
Thread 1 (LWP 1794237):
#0 0x00000000580f5eb7 in ?? ()
#1 0x00000000580a8a70 in ?? ()
#2 0x00000000580a4d6b in ?? ()
#3 0x00000000580a65aa in ?? ()
#4 0x00000000580f5fd5 in ?? ()
#5 0x0000000000000000 in ?? ()
process 1794237
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0x1002cb8000 0x1002cb9000 0x1000 0x0
/tmp/vgdb-pipe-shared-mem-vgdb-1794237-by-marc-on-???
0x1002cb9000 0x1004ff5000 0x233c000 0x0
0x1004ff7000 0x1005023000 0x2c000 0x0
0x1005025000 0x1005fd9000 0xfb4000 0x0
0x1005fd9000 0x1005fdb000 0x2000 0x0
0x1005fdb000 0x10060db000 0x100000 0x0
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0x100610d000 0x1006355000 0x248000 0x0
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0x1ffeffd000 0x1fff001000 0x4000 0x0
0x7fff82bb3000 0x7fff82bd4000 0x21000 0x0 [stack]
0x7fff82be6000 0x7fff82be9000 0x3000 0x0 [vvar]
0xffffffffff600000 0xffffffffff601000 0x1000 0x0 [vsyscall]
[Inferior 1 (process 1794237) detached]
=== End of stack trace ===
==1794237==
==1794237== Process terminating with default action of signal 11 (SIGSEGV)
==1794237== Access not within mapped region at address 0x1
==1794237== at 0x4E27206: char32_t
QUtf8Functions::nextCharacterFromUtf8<QUtf8BaseTraits>(qchar8_t const*&,
qchar8_t const*, char32_t) [clone .constprop.0] (in
/home/marc/Qt/qtbase-submit-build/lib/libQt6Core.so.6.11.0)
==1794237== by 0x4E2CE6F:
QXmlStreamWriterPrivate::writeEscaped(QAnyStringView, bool) (in
/home/marc/Qt/qtbase-submit-build/lib/libQt6Core.so.6.11.0)
==1794237== by 0x4E2E563: QXmlStreamWriter::writeAttribute(QAnyStringView,
QAnyStringView) (in /home/marc/Qt/qtbase-submit-build/lib/libQt6Core.so.6.11.0)
==1794237== by 0x1344B5: tst_QXmlStream::writerAutoEmptyTags() const (in
/home/marc/Qt/qtbase-submit-build/tests/auto/corelib/serialization/qxmlstream/tst_qxmlstream)
==1794237== by 0x4CAF150: QMetaMethodInvoker::invokeImpl(QMetaMethod, void*,
Qt::ConnectionType, long long, void const* const*, char const* const*,
QtPrivate::QMetaTypeInterface const* const*) (in
/home/marc/Qt/qtbase-submit-build/lib/libQt6Core.so.6.11.0)
==1794237== by 0x4CAFCC6: QMetaMethod::invokeImpl(QMetaMethod, void*,
Qt::ConnectionType, long long, void const* const*, char const* const*,
QtPrivate::QMetaTypeInterface const* const*) (in
/home/marc/Qt/qtbase-submit-build/lib/libQt6Core.so.6.11.0)
==1794237== by 0x4A9AFD9: QTest::invokeTestMethodIfValid(QMetaMethod,
QObject*) (in /home/marc/Qt/qtbase-submit-build/lib/libQt6Test.so.6.11.0)
==1794237== by 0x4AA3686: QTest::TestMethods::invokeTestOnData(int) const
(in /home/marc/Qt/qtbase-submit-build/lib/libQt6Test.so.6.11.0)
==1794237== by 0x4AA464D: QTest::TestMethods::invokeTest(int, QLatin1String,
std::optional<QTest::WatchDog>&) const (in
/home/marc/Qt/qtbase-submit-build/lib/libQt6Test.so.6.11.0)
==1794237== by 0x4AA50F9: QTest::TestMethods::invokeTests(QObject*) const
(in /home/marc/Qt/qtbase-submit-build/lib/libQt6Test.so.6.11.0)
==1794237== by 0x4AA5CB7: QTest::qRun() (in
/home/marc/Qt/qtbase-submit-build/lib/libQt6Test.so.6.11.0)
==1794237== by 0x4AA5EF1: QTest::qExec(QObject*, int, char**) (in
/home/marc/Qt/qtbase-submit-build/lib/libQt6Test.so.6.11.0)
==1794237== If you believe this happened as a result of a stack
==1794237== overflow in your program's main thread (unlikely but
==1794237== possible), you can try to increase the size of the
==1794237== main thread stack using the --main-stacksize= flag.
==1794237== The main thread stack size used in this run was 8388608.
```
Lemme throw ubsan/asan on the noinline code.
