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such as sh -c 'echo `echo foo`' . The memory allocated with ckmalloc() at parser.c:1349:readtoken1() (search for "done:" label) was never freed. I changed this to use 'string stack' framework of Ash. Note that a string on string stack is properly freed on exception and end of command parsing, and no explicit free or signal handlings required. See TOUR for an overview, and memalloc.[ch] for details of string stack.