My MacBook keeps crashing My Mac keeps crashing with the same error:


  a freed zone element has been modified in zone kalloc.64


Here are four crash reports I collected over a period of time.

It happens no matter what I'm doing, using the terminal, the browser, even when the screensaver is on.

I did try disabling avira real time scan (didn't exit) but that didn't stop the crashing.

This is driving me nuts, any ideas?
It's hard to say from the crash reports, the good news is that the issue may be related to software - a misbehaving third party kernel module may cause a kernel panic.

From you crash reports I see the following 3rd party module:

com.avira.kext.FileAccessControl


Try updating or removing avira, and see if that helps.