Hi Sicco,

As the message says, this happens when the system runs out of memory. I assume this happens after KLEE runs for a while. You could try running things with DFS (--search=dfs), which is less memory hungry.

Best,
Cristian

On 27/03/18 08:45, Sicco Verwer wrote:

Dear all,

I am trying to run KLEE in my class on concolic execution. Some student get the 
following message after which KLEE quits, and I cannot seem to find the cause, 
or solution. Does anyone know?

“KLEE: WARNING: fork failed (for STP) - Cannot allocate memory”

Thanks and all the best,
Sicco Verwer
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