[lldb-dev] Windows crash after D9056

[Oleksiy Vyalov]

Hi Colin,

could you give more context about crash - what build configuration do you
use (debug, release,..) and which OS?
I'm running this code on Windows 7 and haven't noticed any failures.


On Thu, May 21, 2015 at 8:57 AM, Colin Riley <colin at codeplay.com> wrote:

>
> Zachary, do you see this on windows at all? Tip for us results in crashes
> when releasing file descriptors without the below fix.
>
> Colin
>
>
> 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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-- 
Oleksiy Vyalov | Software Engineer | ovyalov at google.com
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