Jiri Podhorsky created TS-3821:
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Summary: Segmentation fault possibly due leaks in atscppapi
Key: TS-3821
URL: https://issues.apache.org/jira/browse/TS-3821
Project: Traffic Server
Issue Type: Bug
Components: CPP API
Reporter: Jiri Podhorsky
Assignee: Brian Geffon
Hello,
I'm getting segmentation faults with ATS 5.3.1, possibly when I enabled plugins
in atscppapi, in which are used other Plugins than GlobalPlugin
(TransformationPlugin, InterceptionPlugin,...)
i'm building traffic server only with parameters:
./configure --prefix=/install --exec-prefix=/exec --with-user=trafficserver
--enable-cppapi
I'm getting segfault:
{noformat}
traffic_server: Segmentation fault (Address not mapped to object [(nil)])
traffic_server - STACK TRACE:
/www/trafficserver/install/bin/traffic_server(_Z19crash_logger_invokeiP7siginfoPv+0x99)[0x4c64d9]
/lib/x86_64-linux-gnu/libpthread.so.0(+0xf0a0)[0x2afbe25d90a0]
{noformat}
I tried to find an Issue and found possible leak in dectructor ~Transaction()
of Transaction.cc file.
The leak is, there is added plugin by addPlugin(TransactionPlugin *);
and according to documentation
[https://docs.trafficserver.apache.org/en/latest/api/classatscppapi_1_1Transaction.html#a9835e610553275d197cabfbd6d1cab7b],
Transaction should be responsible for cleaning.
But nothing removes items of list state_.plugins_, where should be pointers to
memory allocated with new, which won't be deleted by delete state_;
I tried to correct it with
{noformat}
for (TransactionPlugin* tmp : state_->plugins_) {
delete tmp;
}
{noformat}
But it didn't work. I'm getting similar segfault with another
{noformat}
traffic_server: Segmentation fault (Invalid permissions for mapped object
[0x2b86141ea898])
traffic_server - STACK TRACE:
/www/trafficserver/install/bin/traffic_server(_Z19crash_logger_invokeiP7siginfoPv+0x99)[0x4c64d9]
/lib/x86_64-linux-gnu/libpthread.so.0(+0xf0a0)[0x2b85d603d0a0]
[0x2b86141ea898]
{noformat}
I tried to find more deep and find the plugins should be freed by delete in
another class in file utils_internal.cc.
But if this is true, I should see in debug mode message, which is printed
before delete:
{noformat}
LOG_DEBUG("Locked Mutex...Deleting transaction plugin at %p", *iter);
{noformat}
But I don't see such messages in log.
I can see in error.log lot of these messages. I'm getting them at least every
second.
{noformat}
20150805.16h37m04s [atscppapi] [Transaction.cc:343, operator()()] server
request already initialized
{noformat}
Can you help me find the issue? Thanks for help in advance.
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