Messages in this thread | | | Date | Wed, 29 Jul 1998 14:46:03 -0500 | From | John Fulmer <> | Subject | Re: NFS and 2.1.111 |
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Alan Cox wrote:
> > or possibly .../rpc_debug. The output may be voluminous, but to track down the > > problem it would help to know what NFS or RPC routine is failing. > > The current NFS client code is broken. It has been since early 2.1.x. It > makes one assumption that its safe to manipulate sockets from the received > data callback which isnt unfortunately true. > > I've had a look at the area of code concerned and while its probably safe > for UDP (it may not be SMP safe) its not safe for TCP and not easily fixable > as I had hoped. > > If nobody else has had time in a few weeks I may have another look at it >
I can now trace down the exact problem. I'm using an automounter (autofs). When the unmount timeout occurs, the "Input/output error" happens. This doesn't affect manually mounted drives.
SO...
To reproduce the error without the automounter, I did the following:
I made a 40MB file of zero's
"dd if=/dev/zero of=40M bs=$((1024*1024)) count=40"
I then mounted my nfs public directory
"mount pulsar:/export/home/public /a"
Then I tried to copy it from my local hard drive to my NFS mounted directory.
"[root@bofh jfulmer]# cp 40M /a cp: overwrite `/a/40M'? y"
Then I switch to another xterm and try to umount /a
"[root@bofh jfulmer]# umount /a umount: /a: device is busy [root@bofh jfulmer]# "
As soon as I do this, the nfs transfer fails with:
"cp: /a/40M: Input/output error [root@bofh jfulmer]#"
Apparently just trying to unmount a busy nfs filesystem is enough to cause the error. This must be reletively new, since it worked in the earlier 2.1.10x kernels (It errors in 2.1.109 BTW.)
Thanks,
jf
-- ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ + John Fulmer | "UNIX was not designed to stop + + Secure Network System | you from doing stupid things, + + Lawrence, Kansas | because that would also stop you + + | from doing clever things." + + jfulmer@iegroup.com | + + http://www.iegroup.com | -- Larry Wall + + "The opinions contained above may not reflect those of SNS" + ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
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