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SubjectRe: problems with RedHat 6.0 and NFS
Dave Meyer wrote:
>
> We have an NFS server running RedHat 6.0 (running 2.2.5-22 UP) that
> sometimes behaves really badly under heavy loads. What happens is
> that dmesg will show a bunch of lines like[snip]
> and the nfsd processes will come to a complete halt. In addition,
> they can't be stopped - `kill -9' means nothing to them. The
> filesystem can't be unmounted, and after rebooting there are
> invariably problems that fsck must repair.

I am having similar lockups with 2.2.12, 2.2.13pre[8,9], etc.
The messages I typically get are:

EXT2-fs error (device sd(8,33): ext2_new_block: Free blocks count
corrupted
for block group 235 [only appears on the Dell sometimes]

and when NFS locks up I get:

nfs_dentry_delete: //xfer: ino=<some number>, count=2, nlink=2

About all I can do is get a dump with the SYSRQ keys. NFS seems
to be locked up in fs/nfs/inode.c: nfs_free_dentries()

> This problem seems to crop up most often when several people are
> compiling on the same remote filesystem.
My problem crops up when I am NFS copying 1G of files from from box A to
box B and 1G from box B to box A, all via 100-T. Then I execute the
following on either box (e.g., box A):

on box A:
cd <some dir on NFS mounted directory box B>
mkdir testfiles
cp <some files> testfiles
in a loop, do:
ln -s testfiles testfiles-1
ls testfiles*
rm testfiles-1
mv testfiles testfiles-1
ln -s testfiles-1 testfiles
ls testfiles*
rm testfiles
mv testfiles-1 testfiles
enddo

System:
Penguin dual PIII, RedHat 6.0,
Dell WS 400 dual PII/300, RedHat 6.0

both are SMP boxes with 2.2.12, 2.2.13pre8, 2.2.13pre9, and 2.2.13pre9+
Andrea's patches (almost pre10) including ikd.

I have been working with Alan Cox and Andrea Arcangeli on this issue.

If anyone has any similar lockups or other info, please share it
with us....

Cheers,
--
W. Wade, Hampton <whampton@staffnet.com>

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