BDB hung during close db_env.

Question

We are using BDB XML.And we are calling
delete DbXml::XmlManager *
We got a hung, no any return or error.
stack trace as below:
(gdb) bt
warning: Lowest section in system-supplied DSO at 0xffffe000 is .hash at ffffe0b4
0x4f66e071 in pthread_cond_wait () from /lib/libpthread.so.0
(gdb) bt
#0 0x4f66e071 in pthread_cond_wait () from /lib/libpthread.so.0
#1 0x4f2130bd in pthread_cond_wait () from /lib/libc.so.6
#2 0xf6b0e918 in __db_pthread_mutex_lock () from /usr/app/capc/CL_Agent/LTE/thirdparty/lib/libdb_cxx-4.6.so
#3 0xf6b0e39d in __db_tas_mutex_lock () from /usr/app/capc/CL_Agent/LTE/thirdparty/lib/libdb_cxx-4.6.so
#4 0xf6baf1d9 in __lock_id_free () from /usr/app/capc/CL_Agent/LTE/thirdparty/lib/libdb_cxx-4.6.so
#5 0xf6bc9ba3 in __dbc_destroy () from /usr/app/capc/CL_Agent/LTE/thirdparty/lib/libdb_cxx-4.6.so
#6 0xf6bbfd25 in __db_refresh () from /usr/app/capc/CL_Agent/LTE/thirdparty/lib/libdb_cxx-4.6.so
#7 0xf6bbfa5b in __db_close () from /usr/app/capc/CL_Agent/LTE/thirdparty/lib/libdb_cxx-4.6.so
#8 0xf6bd6d66 in __db_close_pp () from /usr/app/capc/CL_Agent/LTE/thirdparty/lib/libdb_cxx-4.6.so
#9 0xf6b02984 in Db::close () from /usr/app/capc/CL_Agent/LTE/thirdparty/lib/libdb_cxx-4.6.so
#10 0xf68f3d25 in DbXml::DbWrapper::close () from /usr/app/capc/CL_Agent/LTE/thirdparty/lib/libdbxml-2.4.so
#11 0xf68f7d60 in DbXml::DbWrapper::~DbWrapper () from /usr/app/capc/CL_Agent/LTE/thirdparty/lib/libdbxml-2.4.so
#12 0xf68f88f8 in DbXml::IndexDatabase::~IndexDatabase () from /usr/app/capc/CL_Agent/LTE/thirdparty/lib/libdbxml-2.4.so
#13 0xf695e8e8 in DbXml::SyntaxDatabase::~SyntaxDatabase () from /usr/app/capc/CL_Agent/LTE/thirdparty/lib/libdbxml-2.4.so
#14 0xf68cfbac in DbXml::Container::~Container () from /usr/app/capc/CL_Agent/LTE/thirdparty/lib/libdbxml-2.4.so
#15 0xf68c746c in DbXml::Container::release () from /usr/app/capc/CL_Agent/LTE/thirdparty/lib/libdbxml-2.4.so
#16 0xf692caf2 in DbXml::XmlContainer::~XmlContainer () from /usr/app/capc/CL_Agent/LTE/thirdparty/lib/libdbxml-2.4.so
#17 0xf777f051 in std::_Rb_tree<std::string, std::pair<std::string const, DbXml::XmlContainer>, std::_Select1st<std::pair<std::string const, DbXml::XmlContainer> >, std::less<std::string>, std::allocator<std::pair<std::string const, DbXml::XmlContainer> > >::_M_erase ()
from /usr/app/capc/CL_Agent/LTE/agent/lib/libDataAccess.so
#18 0xf7777b8e in ma::BDBXml::terminate () from /usr/app/capc/CL_Agent/LTE/agent/lib/libDataAccess.so
#19 0xf7a96dd4 in ma::ConfigQueryTool::queryTerminate () from /usr/app/capc/CL_Agent/LTE/agent/lib/libcla_get_cfg.so
#20 0xf7ac6863 in queryTerminate () from /usr/app/capc/CL_Agent/LTE/agent/lib/libcla_get_cfg.so
#21 0xf7f75a7a in CLA_NMI_Handle_reset () at CLA_NMI.c:3872
#22 0xf7f70e6c in clanmiCCSDispatchThread (arg=0x0) at CLA_NMI.c:1575
#23 0x4f669e49 in ?? () from /lib/libpthread.so.0
#24 0x00000000 in ?? ()
(gdb)
Could anybody tell me how to resolve this issue?
Thanks.

Answer 1

Code is like below. and we have two process A, B which are using this class/function. During we hit this issue, only one process is running, this process wants to termiate() and then restart. But terminate() hung there. no return any more.
* @brief The pointer to an XmlManager.
DbXml::XmlManager * m_manager_;
void BDBXml::terminate()
m_containers_.clear();
if(m_manager_ == NULL)
return;
if(m_manager_->getDbEnv() != NULL)
try
delete m_manager_->getDbEnv();
catch(...)
CL_LOG_ERROR("Delete DbEnv failed.");
delete m_manager_;
m_manager_ = NULL;
Edited by: user646849 on Sep 23, 2010 5:31 PM