Re: Crash when unmounting NFS/TCP with -f

[Bill Davidsen]

Brice Goglin wrote:
> Hi Trond,
>
> I'm using NFS (v2) over TCP (in a SSH tunnel).
> Each time the SSH dies before a umount NFS, I have to umount -f
> and I get a crash (only sysrq works).
> Actually, the crash occurs a few seconds after umount -f.
>
> It seems that killing SSH by hand does _not_ lead to crash.
> But a long network failure does.
> I remember seeing this bug several times with all stable releases
> from 2.6.7 to 2.6.11. I didn't try with earlier versions.
>
> I didn't see anything in the logs (after reboot). But I can't be sure
> there was nothing in dmesg since I didn't get a chance to chvt 1 and
> see console messages before rebooting (with sysrq).
>
> Do you have any idea how to debug this ?

No clue, but a question: is this a hard or soft mount? Could you post 
your ssh and mount commands, munged as needed for security? That might 
give someone a clue.

I did this "back when" but I don't recall having a problem with it.

--
   -bill davidsen (davidsen@xxxxxxx)
"The secret to procrastination is to put things off until the
 last possible moment - but no longer"  -me

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