[LOGCXX-384] Mutex deadlock on first log4cxx method call

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Cannot Reproduce
• Affects Version/s: 0.10.0
• Component/s: Appender
• Labels: log4cxx uclibc x86
• Environment: Built on Ubuntu 10.04 for x86 target machine. Log4cxx is built within Buildroot environment and compiler is uclibc.
• Assignee: Curt Arnold
• Reporter: Aleksandar Zivkovic
• Created: 08/Jun/11 12:34
• Updated: 07/Aug/20 16:22
• Resolved: 07/Aug/20 16:22

Description

I have the similar problem as described in https://issues.apache.org/jira/browse/LOGCXX-334.
After some investigation I have discovered the following:
1. when --with-charset is not specified (used default) I have the following backtrace when deadlock occurs:
(gdb) bt
#0 0xb75ca6d6 in syscall () from /lib/libc.so.0
#1 0xb769e2d8 in __cxa_guard_acquire () from /usr/lib/libstdc++.so.6
#2 0xb77db3fe in log4cxx::helpers::Transcoder::decode () from .//liblog4cxx.so.10
#3 0xb77ce920 in log4cxx::helpers::StringHelper::toString () from .//liblog4cxx.so.10
#4 0xb77850a8 in log4cxx::helpers::MutexException::formatMessage () from .//liblog4cxx.so.10
#5 0xb7786585 in log4cxx::helpers::MutexException::MutexException () from .//liblog4cxx.so.10
#6 0xb77aa2e9 in log4cxx::helpers::Mutex::Mutex () from .//liblog4cxx.so.10
#7 0xb777193b in log4cxx::helpers::CharsetDecoder::createDefaultDecoder () from .//liblog4cxx.so.10
#8 0xb7771a07 in log4cxx::helpers::CharsetDecoder::getDefaultDecoder () from .//liblog4cxx.so.10
#9 0xb77db416 in log4cxx::helpers::Transcoder::decode () from .//liblog4cxx.so.10
#10 0xb77a6a88 in log4cxx::LogManager::getLogger () from .//liblog4cxx.so.10
#11 0xb77a21b5 in log4cxx::Logger::getLogger () from .//liblog4cxx.so.10
#12 0x08049fd2 in main ()
Deadlock occurs always and can easily be reproduced.

2. when built with --with-charset=utf-8 flag I have different behavior: deadlock doesn't appear but my application exits with the following printout:
$ ./Logging_test
terminate called after throwing an instance of 'log4cxx::helpers::MutexException'
what(): Mutex exception: stat = 70023
Aborted
$