On Fri, Nov 04, 2005 at 10:27:42PM +0100, Heiko Carstens wrote:
> > > See original stack back trace below and Andreas' patch and analysis
> > > here:
> > > http://www.ussg.iu.edu/hypermail/linux/kernel/0410.3/1844.html
>
> I probably should add that with "original" stack back trace a trace of
> a 2.6.10 kernel was meant, if that wasn't clear, but the DM code is
> still the same in 2.6.14.
>
> > > <4>Call Trace:
> ...
> > > <4> [<0000000010831380>] __map_bio+0x70/0x160 [dm_mod]
> > > <4> [<000000001083173e>] __split_bio+0x1e6/0x538 [dm_mod]
> > > <4> [<0000000010831ba8>] dm_request+0x118/0x25c [dm_mod]
> > > <4> [<0000000000241074>] generic_make_request+0xf0/0x21c
> > > <4> [<0000000010831380>] __map_bio+0x70/0x160 [dm_mod]
> > > <4> [<000000001083173e>] __split_bio+0x1e6/0x538 [dm_mod]
> > > <4> [<0000000010831ba8>] dm_request+0x118/0x25c [dm_mod]
> > > <4> [<0000000000241074>] generic_make_request+0xf0/0x21c
> > > <4> [<0000000010831380>] __map_bio+0x70/0x160 [dm_mod]
> > > <4> [<000000001083173e>] __split_bio+0x1e6/0x538 [dm_mod]
> > > <4> [<0000000010831ba8>] dm_request+0x118/0x25c [dm_mod]
> > > <4> [<0000000000241074>] generic_make_request+0xf0/0x21c
> ...
>
> This part of the call trace is actually good for >1500 bytes of stack
> usage and is what kills us and should be fixed.
> I'm surprised that there are no other bug reports regarding DM and
> stack overflow with 4k stacks.
>...
There were some reports of dm+xfs overflows with 4k stacks on i386.
The xfs side was sorted out, but I son't know the state of the dm part.
> Heiko
cu
Adrian
--
"Is there not promise of rain?" Ling Tan asked suddenly out
of the darkness. There had been need of rain for many days.
"Only a promise," Lao Er said.
Pearl S. Buck - Dragon Seed
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