Steps to reproduce:
1. Take CPU profile.
2. Switch to bottom-up view and try to expand any top-level entry
'Function' field in the child entries is empty.
Here is the original user report: https://groups.google.com/d/msg/google-chrome-developer-tools/9m_d76P98u4/PcwjHgZO5-EJ
the user observed that on Chromium 22.0.1229.79 m on Windows 7 64-bit.
I managed to reproduce that on Chrome Linux 22.0.1229.91
There is an exception in the console if you open inspector on inspector window:
Uncaught TypeError: Cannot call method 'rawLocationToUILocation' of undefined DevTools.js:67662
I am closing this as invalid because this issue is already fixed in ToT.
https://code.google.com/p/chromium/issues/detail?id=153748 is tracking merging the fix into Chrome.