Hi,
I did not know about Address Sanitizer. It looks great. I tried it and
it gives good information about the problem. I will look at it.
Tommi
Am 04.02.2015 um 03:07 schrieb Steve Gieseking:
I have been looking to use cxxtools in some projects that require both
Linux and Windows support. As part of doing some testing in compiling
with Cygwin, I was getting segmentation faults with the rpcechoclient
demo. The application runs but then generates faults when cleaning up
at the end of execution. I went back to the standard Linux version
(master branch) and was able to recreate the problem compiling with
Address Sanitizer. I don’t get this problem with the 2.2.1 release.
What seems to be happening is that Connection::close() is being called
with an object that is part of the list in the Connectable class.
Inside Connectable::onConnectionClose(), it finds the element and
removes it which calls the destructor. When it returns back, you are
in the object that you just called the destructor for.
With the standard Linux compilation, it basically ignores it. With
Address Sanitizer added, it will detect that the object has already
been deleted and generate an error.
Below is a trace the code with various trace and debug statements added.
The object that is a problem is at address 0x60300000abe0.
At 2015-02-03 15:00:40.52715, it is created.
At 2015-02-03 15:00:40.53251, it’s close function is called.
At 2015-02-03 15:00:40.53268, it’s destructor is called.
It is still accessed when returning and causes a Heap Use After Free
error.
Steve
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