On Feb 18, 2007, at 10:10 AM, OGAWA Hirofumi wrote:
Kumar Gala <[EMAIL PROTECTED]> writes:I'm seeing an issue with a stock 2.6.20 kernel running on an embedded PPC. I've got a usb flash drive plugged in and the filesystem on the drive is vfat. Running with 64M and no swap. If I execute a series of large (100M+) ftruncate() on the disk the kernel will hang and never return. It seems to be stuck in the idle loop(). The following is the test program I'm running: #include <sys/mman.h> #include <sys/types.h> #include <sys/stat.h> #include <fcntl.h> #include <stdio.h> #include <unistd.h> #include <errno.h> void usage (void) { printf ("truncate_test <filename> <size>\n\n"); } int main(int argc, char *argv[]) { int fd, i; int ret = 0; unsigned int len; if (argc != 3) { printf("Invalid number of arguments\n\n"); usage(); exit(1); } fd = open(argv[1], O_CREAT|O_RDWR|O_TRUNC, S_IRWXU); len = strtoul(argv[2], NULL, 0); ret = ftruncate(fd, len); if (ret) printf ("ftruncate ret = %d %d\n", ret, errno); close(fd); return ret; } I usually run the following twice to get the hang state: time ./trunc_test bar 100000000 & time ./trunc_test baz 100000000 & I was wondering if anyone had any suggestions on what to poke at next to try and figure out what is going on.Can you check /sys/block/xxx/stat or something to make sure there is no outstanding IO request? It seems to be no response from the lower layer...
Once the system locks up I dont have any ability to do anything. - k - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
