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    SubjectO_DIRECT leaks memory on linux-2.6.0-test9

    recently I noticed that direct IO causes memory leaks with
    The program that causes memory leaks is "fsstress", which is
    testcases/kernel/fs/fsstress in ltp-full-20031106.tgz (ftp from

    fsstress does various file operations, and I found that the problem is
    with the combination of write and dread (O_DIRECT read).
    You should be able to reproduce the bug with the following command

    $ while true; do ./fsstress -c -d /usr/src/test -z -f write=1 \
    -f dread=1 -f creat=1 -S -n 1000 -p 32; done

    The test machine is a quad P3 machine with the following file systems.
    /usr/src is an ext3 file system but mounted as an ext2 using mount -t ext2.
    $ mount -v
    /dev/rd/c0d0p2 on / type ext3 (rw,errors=remount-ro)
    proc on /proc type proc (rw)
    devpts on /dev/pts type devpts (rw,gid=5,mode=620)
    /dev/rd/c0d0p5 on /usr/src type ext2 (rw)

    I didn't see memory leaks with the other three combinations of
    read+write (dread+dwrite, read+dwrite, and read+write).

    Any ideas?
    I'll try to debug this next week, but rather like to see the fix
    in the meanwhile. :)
    IWAMOTO Toshihiro
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      Last update: 2005-03-22 13:58    [W:0.021 / U:0.084 seconds]
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