InnoDB: Unable to lock ./ibdata1 error: 35

Strange error codes, both from MySQL and the operating system, can be explained by running a shell command perror which is a part of MySQL distribution. On Linux, for example, perror 35 returns OS error code 35: Resource deadlock avoided. I do not have an OSX system handy to test, but from this:

http://www.opensource.apple.com/source/xnu/xnu-1456.1.26/bsd/sys/errno.h

I gather that error 35 is "Resource temporarily unavailable", meaning that some other process (possibly another instance of mysqld?) has already locked the file.

To debug, first I would check if there is another MySQL process running by chance (looks like you already have), and if not, reboot for good measure to make sure there are no strange stale file locks, and then try again.

Somebody has run into this error before, and found a solution:

mysql_install_db, error: 35, on a Mac OS X 10.9.1

Just had this issue with MAMP Pro. Couldn't stop or start MySQL. Typed ps aux | grep mysql, then kill [process id] for each line. Then I could successfully launch MySQL again from MAMP Pro.