[lldb-dev] Windows crash after D9056

Colin Riley colin at codeplay.com
Thu May 21 08:57:15 PDT 2015

Zachary, do you see this on windows at all? Tip for us results in 
crashes when releasing file descriptors without the below fix.


On 19/05/2015 12:52, Aidan Dodds wrote:
> Hi,
> We have been seeing a crash on windows when connecting to an android 
> target using lldb-server.
> I am not sure if this affects other platforms too.
> I think this was introduced with http://reviews.llvm.org/D9056.
> I tracked the crash back to the workings of ModuleCache::GetAndPut().
> The crash seems to be due to a file descriptor being released twice, 
> once by the original "File lock_file" and again by the "LockFile lock" 
> who share the same file descriptor.
> The file descriptor sharing happens because of this line:
> ModuleCache.cpp @ 164
> LockFile lock (lock_file.GetDescriptor ());
> Both destructors attempt to release effectively the same file 
> descriptor.  I was able to fix the crash by duplicating the file 
> handle in the lock file constructor using _dup().  (patch attached)
> I wasn't sure if this was the right fix however. Has anyone else seen 
> this?
> Should "File lock_file" perhaps transfer its file descriptor 
> completely rather then share it?
> Thanks,
> Aidan
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- Colin Riley
Senior Director,
Parallel/Graphics Debugger Systems

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