[dm-devel] Question about 'dmsetup remove' and dtr of target_type

[Reng Zeng]

Thanks for reply, you are right, there may be something still holds a
reference of that, which also cause the device busy after 'dmsetup remove'.

I figure out the reason is that, there is one "divide error" which may crash
device mapper, I just do not expect that is the reason why destruction of
target never got invoked.

Thanks very much.

Alan

2008/11/9 Alasdair G Kergon <agk at redhat.com>

> On Sun, Nov 09, 2008 at 12:27:24AM -0500, Reng Zeng wrote:
> > However, I use "dmsetup remove" hundreds times, as the debug info, but it
> > never enter the dtr function I defined.
> > Anybody have idea on this? Or how to dig into that to discover the
> reason?
>
> Something still holds a reference to the table?
> E.g. you have dm_table_get() without a matching dm_table_put() somewhere.
>
> Try a debugger like kgdb?  Check t->holders?
>
> Or post your code here (assuming it's GPL) and someone might help.
>
> Alasdair
> --
> agk at redhat.com
>
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