[LOGCXX-422] Sporadic crash in CachedDateFormat::millisecondFormat()

• Type: Bug
• Status: Resolved
• Priority: Critical
• Resolution: Fixed
• Affects Version/s: 0.11.0
• Component/s: Core
• Environment: Windows 7, Visual C++ 2008 (SP1)
• Assignee: Thorsten Schöning
• Reporter: Jörg Hansen
• Created: 29/Jan/14 12:14
• Updated: 30/Jan/14 08:52
• Resolved: 30/Jan/14 08:52

Description

The method CachedDateFormat::findMillisecondStart() was changed in rev 1559522 for LOG4CXX-420.

Since then I experience sporadic crashes in the method CachedDateFormat::millisecondFormat(). Further investigation showed that the specified parameter 'buf' is sometimes undefined, so any try to write sporadically fails.

I have a debugging session open with the crash at the time of this writing. The current log message is "Current spot Reichenspergerplatz - EBP at (3,13) of entry 582" and should be written to a ConsoleAppender. The current conversion pattern is "%d %p [%c] %m%n". The call stack at the crash is (sorry, german version of vc2008):
log4cxx.dll!log4cxx::pattern::CachedDateFormat::millisecondFormat(int millis=147018584, std::basic_string<wchar_t,std::char_traits<wchar_t>,std::allocator<wchar_t> > & buf=<Schlechtes Ptr>, int offset=22) Zeile 236 + 0x12 Bytes
log4cxx.dll!log4cxx::pattern::CachedDateFormat::format(std::basic_string<wchar_t,std::char_traits<wchar_t>,std::allocator<wchar_t> > & buf="", __int64 now=1390993757666876, log4cxx::helpers::Pool & p=

{...}) Zeile 189 + 0x21 Bytes
log4cxx.dll!log4cxx::pattern::DatePatternConverter::format(const log4cxx::helpers::ObjectPtrT<log4cxx::spi::LoggingEvent> & event={...}

, std::basic_string<wchar_t,std::char_traits<wchar_t>,std::allocator<wchar_t> > & toAppendTo="", log4cxx::helpers::Pool & p=

{...}) Zeile 104 + 0x23 Bytes
log4cxx.dll!log4cxx::PatternLayout::format(std::basic_string<wchar_t,std::char_traits<wchar_t>,std::allocator<wchar_t> > & output="", const log4cxx::helpers::ObjectPtrT<log4cxx::spi::LoggingEvent> & event={...}

, log4cxx::helpers::Pool & pool=

{...}) Zeile 91
log4cxx.dll!log4cxx::WriterAppender::subAppend(const log4cxx::helpers::ObjectPtrT<log4cxx::spi::LoggingEvent> & event={...}

, log4cxx::helpers::Pool & p=

{...}) Zeile 217
log4cxx.dll!log4cxx::WriterAppender::append(const log4cxx::helpers::ObjectPtrT<log4cxx::spi::LoggingEvent> & event={...}

, log4cxx::helpers::Pool & pool1=

{...}) Zeile 88 + 0x13 Bytes
log4cxx.dll!log4cxx::AppenderSkeleton::doAppend(const log4cxx::helpers::ObjectPtrT<log4cxx::spi::LoggingEvent> & event={...}

, log4cxx::helpers::Pool & pool1=

{...}) Zeile 143
log4cxx.dll!log4cxx::helpers::AppenderAttachableImpl::appendLoopOnAppenders(const log4cxx::helpers::ObjectPtrT<log4cxx::spi::LoggingEvent> & event={...}

, log4cxx::helpers::Pool & p=

{...}) Zeile 69 + 0x29 Bytes
log4cxx.dll!log4cxx::Logger::callAppenders(const log4cxx::helpers::ObjectPtrT<log4cxx::spi::LoggingEvent> & event={...}

, log4cxx::helpers::Pool & p=

{...}) Zeile 97 + 0x12 Bytes
log4cxx.dll!log4cxx::Logger::forcedLog(const log4cxx::helpers::ObjectPtrT<log4cxx::Level> & level1={...}

, const std::basic_string<char,std::char_traits<char>,std::allocator<char> > & message="Current spot Reichenspergerplatz - EBP at (3,13) of entry 582", const log4cxx::spi::LocationInfo & location=

{...}

) Zeile 129

Translation help:
Zeile = line
Schlechtes Ptr = bad pointer

Please call back if you need further information.