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Your strace output looks strange :-)
Unless it's truncated, we see that the wait4() doesn't return when the
test pthread executable exits...
Could you try building this code :
"""
#include <pthread.h>
void* routine(void* p){return NULL;}
int main(){
 pthread_t p;
 if(pthread_create(&p,NULL,routine,NULL)!=0)
 return 1;
 (void)pthread_detach(p);
 return 0;
}
"""
(with gcc -o test test.c -lpthread)
And running it from the command line, to see your shell hangs (you
might also want to try 'strace -f sh -c "test"').