// cc -o queuetest queuetest.c -fsanitize=address -O0 -fno-omit-frame-pointer -fno-common

#include <sys/queue.h>
#include <stdlib.h>

struct Foo
{
  int i;
  TAILQ_ENTRY(Foo) entries;
};
TAILQ_HEAD(FooList, Foo);

int main()
{
  struct FooList flist = TAILQ_HEAD_INITIALIZER(flist);
  struct Foo *f1 = malloc(sizeof(struct Foo));
  struct Foo *f2 = malloc(sizeof(struct Foo));
  TAILQ_INSERT_TAIL(&flist, f1, entries);
  TAILQ_INSERT_TAIL(&flist, f2, entries);
  struct Foo *node = NULL;
  struct Foo *tmp1 = NULL;
  TAILQ_FOREACH_SAFE(node, &flist, entries, tmp1)
  {
    struct Foo *next = TAILQ_NEXT(node, entries);
    struct Foo *tmp2 = NULL;
    TAILQ_FOREACH_FROM_SAFE(next, &flist, entries, tmp2)
    {
      TAILQ_REMOVE(&flist, next, entries);
      free(next);
      next = NULL;
    }
  }
  free(f1);
  return 0;
}