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From: David Woodhouse <dwmw2@infradead.org>
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Subject: Re: Question/suggestion 
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joakim.tjernlund@lumentis.se said:
> hmm, this is somewhat difficult. I don't have sources handy for
> umount, nor is umount compiled with debug turned on.

It's not in userspace. It'll be in the kernel.

> Any pointers on how to get backtrace working? 

I assume that was added in a later kernel. 

--
dwmw2