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    Subject2.6.20 kernel hang with USB drive and vfat doing ftruncate
    Date
    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.

    - k
    -
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