Hi, The moment I define a new variable under thread_options I start seeing a crash in 'setup_files' files Function. Backtrace points to the following lline: if (td->io_ops->setup). Gdb shows the value of null for io_ops. So essentially what's happenings is io_ops is not getting set correctly when I add a new variable under 'thread_options' structures. This can be easily reproduced by simply adding a variable under thread_options structiure. No other changes are required. Can someone help? /rK -- To unsubscribe from this list: send the line "unsubscribe fio" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html