<html>
<head>
<meta content="text/html; charset=ISO-8859-1"
http-equiv="Content-Type">
</head>
<body bgcolor="#FFFFFF" text="#000000">
<br>
Zachary, do you see this on windows at all? Tip for us results in
crashes when releasing file descriptors without the below fix. <br>
<br>
Colin<br>
<br>
<div class="moz-cite-prefix">On 19/05/2015 12:52, Aidan Dodds wrote:<br>
</div>
<blockquote cite="mid:555B240F.1040009@codeplay.com" type="cite">Hi,
<br>
<br>
We have been seeing a crash on windows when connecting to an
android target using lldb-server.
<br>
I am not sure if this affects other platforms too.
<br>
I think this was introduced with <a class="moz-txt-link-freetext" href="https://urldefense.proofpoint.com/v2/url?u=http-3A__reviews.llvm.org_D9056&d=AwMCAw&c=8hUWFZcy2Z-Za5rBPlktOQ&r=DDUMf06MYELAe1Nlv7KChiwJLLHbYha4jtK_AOiWqwQ&m=fwsKqlRK0pe1P4JSGms_oTNO-NRY6S21xYC0U9ndUJs&s=pvgZZ4TnubRHbwQctM9p-anl4neR5HN1dG2q5ajG96Y&e=">http://reviews.llvm.org/D9056</a>.
<br>
<br>
I tracked the crash back to the workings of
ModuleCache::GetAndPut().
<br>
<br>
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.
<br>
<br>
The file descriptor sharing happens because of this line:
<br>
ModuleCache.cpp @ 164
<br>
LockFile lock (lock_file.GetDescriptor ());
<br>
<br>
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)
<br>
I wasn't sure if this was the right fix however. Has anyone else
seen this?
<br>
Should "File lock_file" perhaps transfer its file descriptor
completely rather then share it?
<br>
<br>
Thanks,
<br>
Aidan
<br>
<br>
<fieldset class="mimeAttachmentHeader"></fieldset>
<br>
<pre wrap="">_______________________________________________
lldb-dev mailing list
<a class="moz-txt-link-abbreviated" href="mailto:lldb-dev@cs.uiuc.edu">lldb-dev@cs.uiuc.edu</a>
<a class="moz-txt-link-freetext" href="http://lists.cs.uiuc.edu/mailman/listinfo/lldb-dev">http://lists.cs.uiuc.edu/mailman/listinfo/lldb-dev</a>
</pre>
</blockquote>
<br>
<pre class="moz-signature" cols="72">--
- Colin Riley
Senior Director,
Parallel/Graphics Debugger Systems
Codeplay Software Ltd
45 York Place, Edinburgh, EH1 3HP
Tel: 0131 466 0503
Fax: 0131 557 6600
Website: <a class="moz-txt-link-freetext" href="https://urldefense.proofpoint.com/v2/url?u=http-3A__www.codeplay.com&d=AwMCAw&c=8hUWFZcy2Z-Za5rBPlktOQ&r=DDUMf06MYELAe1Nlv7KChiwJLLHbYha4jtK_AOiWqwQ&m=fwsKqlRK0pe1P4JSGms_oTNO-NRY6S21xYC0U9ndUJs&s=0afb2y3W1PABd4uuOPhm8VptPouhoYkenNULJcxr298&e=">http://www.codeplay.com</a>
Twitter: <a class="moz-txt-link-freetext" href="https://urldefense.proofpoint.com/v2/url?u=https-3A__twitter.com_codeplaysoft&d=AwMCAw&c=8hUWFZcy2Z-Za5rBPlktOQ&r=DDUMf06MYELAe1Nlv7KChiwJLLHbYha4jtK_AOiWqwQ&m=fwsKqlRK0pe1P4JSGms_oTNO-NRY6S21xYC0U9ndUJs&s=73i2uRilVEbjZK2l9Ibx42UdTKztIOLqCqdK5RMCj2c&e=">https://twitter.com/codeplaysoft</a>
This email and any attachments may contain confidential and /or privileged information and is for use by the addressee only. If you are not the intended recipient, please notify Codeplay Software Ltd immediately and delete the message from your computer. You may not copy or forward it,or use or disclose its contents to any other person. Any views or other information in this message which do not relate to our business are not authorized by Codeplay software Ltd, nor does this message form part of any contract unless so stated.
As internet communications are capable of data corruption Codeplay Software Ltd does not accept any responsibility for any changes made to this message after it was sent. Please note that Codeplay Software Ltd does not accept any liability or responsibility for viruses and it is your responsibility to scan any attachments.
Company registered in England and Wales, number: 04567874
Registered office: 81 Linkfield Street, Redhill RH1 6BY </pre>
</body>
</html>