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SubjectRe: INFO: rcu detected stall in blkdev_ioctl
If various stall reports regarding loop_set_fd() are hitting below sequence, a patch
was proposed at .

#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include <linux/loop.h>

int main(int argc, char *argv[])
const int fd = open("/tmp/file", O_RDWR | O_CREAT | O_TRUNC, 0600);
const int fd0 = open("/dev/loop0", O_RDONLY);
const int fd1 = open("/dev/loop1", O_RDONLY);
ioctl(fd0, LOOP_SET_FD, fd);
ioctl(fd0, LOOP_CHANGE_FD, fd0);
ioctl(fd1, LOOP_SET_FD, fd0);
return 0;

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