Messages in this thread | | | Date | Fri, 21 Nov 2003 15:18:06 +0900 | From | IWAMOTO Toshihiro <> | Subject | O_DIRECT leaks memory on linux-2.6.0-test9 |
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Hi,
recently I noticed that direct IO causes memory leaks with linux-2.6.0-test9. The program that causes memory leaks is "fsstress", which is testcases/kernel/fs/fsstress in ltp-full-20031106.tgz (ftp from http://sourceforge.net/projects/ltp/).
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 line.
$ 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 - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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