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    SubjectRe: 2.6.20 kernel hang with USB drive and vfat doing ftruncate
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    Kumar Gala <galak@kernel.crashing.org> 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...
    --
    OGAWA Hirofumi <hirofumi@mail.parknet.co.jp>
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