Messages in this thread |  | | | Date | Mon, 25 Aug 2003 12:45:43 -0700 | | From | Andrew Morton <> | | Subject | Re: [BUG] 2.6.0-test4-mm1: NFS+XFS=data corruption |
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"Barry K. Nathan" <barryn@pobox.com> wrote: > > I'm really short on time right now, so this bug report might be vague, > but it's important enough for me to try: > > I have an NFS fileserver (running 2.6.0-test4-mm1) exporting stuff from > three filesystems: ReiserFS, ext3, and XFS. I'm seeing no problems with > my ReiserFS and ext3 filesystems. XFS is a different story. > > My client machine is running 2.4.21bkn1 (my own kernel, not released to > the public; the differences from vanilla 2.4.21 are XFS and Win4Lin). > > If I use my client machine to sign RPM packages (rpm --addsign ...), > using rpm-4.2-16mdk, and the packages are on the XFS partition on the > NFS server, about half of the packages are truncated by a couple hundred > bytes afterwards (and GPG sig verification fails on those packages). > > It's always the same packages that get truncated by the same amounts of > data. This is 100% reproducible. It doesn't matter whether I compile the > kernel with gcc 2.95.3 or 3.1.1. If I perform the operation on my non-XFS > filesystem the problem doesn't happen. If I run 2.6.0-test4-bk2 instead of > test4-mm1 on the NFS server, the problem goes away. (I have never run > any previous -mm kernels on this server.) > > Hmmm... If I sign the packages on the NFS server itself, even with > test4-mm1 on the XFS partition, I can't reproduce the problem. > *However*, that's a different version of RPM (4.0.4). > > Is this enough information to help find the cause of the bug? If not, > it might be several days (if I'm unlucky, maybe even a week or two) > before I have time to do anything more... >
-mm kernels have O_DIRECT-for-NFS patches in them. And some versions of RPM use O_DIRECT. Whether O_DIRECT makes any difference at the server end I do not know, but it would be useful if you could repeat the test on stock 2.6.0-test4.
Alternatively, run
export LD_ASSUME_KERNEL=2.2.5
before running RPM. I think that should tell RPM to not try O_DIRECT.
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