Crash logs aren't saved on Windows 7 when a relative --results-directory path is used (like on the test slaves). Windows XP does not have this issue. The problem is due to a difference in how the post-mortem debugger is launched on these two OSes.
Windows XP: The post-mortem debugger is a child process of the crashing process, and its working directory matches the crashing process's.
Windows 7: The post-mortem debugger is a child process of WerFault.exe, and its working directory is c:\Windows\system32.
We save crash logs to a location relative to $testResultsDirectory in old-run-webkit-tests. When a relative path is passed to --results-directory, the path to the crash log file ends up being relative, too. Since the post-mortem debugger's working directory is c:\Windows\system32, the crash log file path gets resolved against that path, rather than getting resolved against old-run-webkit-tests working directory.
Created attachment 83975 [details]
Ensure $testResultsDirectory is an absolute path before setting up Windows crash log saving
Committed r79819: <http://trac.webkit.org/changeset/79819>