nfsd Security: /// bad export. error

T.A. dos Santos (teste@naomi.fe.up.pt)
Sun, 12 Sep 1999 17:25:03 +0100 (WEST)

Some time ago i reported receiving this error in a knfsd 1.4.4 and
later setup with kernels 2.2.7 and above. This happened only under extreme
stress in the 100GB+ nfs export - at night during a backup with Arkeia, in
this case. I was asked to patch the kernel with the following patch, in
order to get some information about the moment it happens. The patch is:

--- nfsfh.c.orig Thu Jul 15 20:37:20 1999
+++ nfsfh.c Thu Jul 15 20:37:55 1999
@@ -1143,6 +1143,10 @@
printk("nfsd Security: %s/%s bad export.\n",
dentry->d_parent->d_name.name,
dentry->d_name.name);
+ printk("nfsd Security: %p %p %p.\n",
+ exp->ex_dentry,
+ tdentry,
+ dentry);
goto out;
}
}

Anyway, it finally happened, after almost two months. To fix it was
only a matter of restarting nfs. No reboot needed. The results were:

Sep 6 22:34:59 jerry kernel: nfsd Security: /// bad export.
Sep 6 22:34:59 jerry kernel: nfsd Security: c0083e60 d0621140 d0621140.
Sep 6 22:35:00 jerry kernel: nfsd Security: /// bad export.
Sep 6 22:35:00 jerry kernel: nfsd Security: c0083e60 d0621140 d0621140.
... ... ...
Sep 7 06:46:14 jerry kernel: nfsd Security: /// bad export.
Sep 7 06:46:14 jerry kernel: nfsd Security: c0083e60 d0621140 d0621140.

I hope it helps someone to solve the problem. It is the only problem we
have been having with it in a heavily used server. And it only happens
each two months or so.

Reagrds,

TA

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