NVIDIA interview questions

The interviewer asked questions based on my resume, and then brain teaser, algorithm problems at last. The interviewer will give you hint if you blocked and he is very nice.

Phone interview... Called for 30 mins... gave me coding questions... asked me systems concepts.. I was interviewed over the phone... They asked me normal questions like... 1. What is the difference between a thread and a mutex? 2. When is a TLB flushed? 3. Gave me a linked list question...A 2-D linked list..and you need to convert that to a 1-D linked list 4. malloc question...malloced pointer was not freed...etc..