On Mon, 7 May 2012, Robert Święcki wrote: > root@ise-test:~/kern-fuz# ./cont.sh > su: Cannot fork user shell > su: Cannot fork user shell > su: Cannot fork user shell > > root@ise-test:~/kern-fuz# strace -e mmap,clone su test -c 'kill -CONT > -1' 2>&1 | grep "= \-1" > clone(child_stack=0, > flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, > child_tidptr=0x7fadf334f9f0) = -1 ENOMEM (Cannot allocate memory) > mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, > 0) = -1 ENOMEM (Cannot allocate memory) Hmmm... That looks like some maximum virtual memory limit was violated. Check ulimit and the overcommit settings (see /proc/meminfo's commitlimit etc)