sandbox: Fix memory leak caused when a thread is terminated while it is polling a file
sandbox: Fix memory leak caused when a thread is terminated while it is polling a file

basu96/crux-judge,CRUx-BPHC/crux-judge,CRUx-BPHC/crux-judge,basu96/crux-judge,basu96/crux-judge,basu96/crux-judge,basu96/crux-judge,CRUx-BPHC/crux-judge