Messages in this thread |  | | Subject | Re: INFO: rcu detected stall in blkdev_ioctl | From | Tetsuo Handa <> | Date | Sat, 5 May 2018 20:57:16 +0900 |
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If various stall reports regarding loop_set_fd() are hitting below sequence, a patch was proposed at https://groups.google.com/d/msg/syzkaller-bugs/5pzXJ8yQFR0/vWeRytaQBAAJ .
---------- #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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