linux-kernel - Re: [2.6.23(?)=<] X used greatest stack depth: N bytes left

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Message-Id: <20071228171312.baa0776b.randy.dunlap@oracle.com>
Date:	Fri, 28 Dec 2007 17:13:12 -0800
From:	Randy Dunlap <randy.dunlap@...cle.com>
To:	=?ISO-8859-1?Q? "Oliver_Pinter_(Pint=E9r_Oliv=E9r)" ?= 
	<oliver.pntr@...il.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [2.6.23(?)=<] X used greatest stack depth: N bytes left

On Sat, 29 Dec 2007 01:58:44 +0100 Oliver Pinter (Pintér Olivér) wrote:

> On 12/29/07, Randy Dunlap <randy.dunlap@...cle.com> wrote:
> > On Fri, 28 Dec 2007 22:11:25 +0100 Oliver Pinter (Pintér Olivér) wrote:
> >
> > > in newer kernel I recently see this warnings:
> > >
> > > X used greatest stack depth: N bytes left
> > >
> > > X E { program name }
> > > N E { x byte }
> > >
> > > ----------------8<--------------
> > > ...
> > > khelper used greatest stack depth: 7496 bytes left
> > > khelper used greatest stack depth: 7184 bytes left
> > > ...
> > > khelper used greatest stack depth: 6328 bytes left
> > > stty used greatest stack depth: 6180 bytes left
> > > mount used greatest stack depth: 6156 bytes left
> > > mknod used greatest stack depth: 5932 bytes left
> > > ...
> > > wpa_supplicant used greatest stack depth: 5740 bytes left
> > > ...
> > > dhclient3 used greatest stack depth: 5500 bytes left
> > > ----------------8<--------------
> > >
> > > it is the "results" of the CONFIG_DEBUG_STACKOVERFLOW=y
> > > CONFIG_DEBUG_STACK_USAGE=y options or it's other problem or feature?
> >
> > CONFIG_DEBUG_STACK_USAGE, in kernel/exit.c:
> >
> > ---
> 
> sure, but to 2.6.22 or 2.6.23-rcX (with merged the cfs scheduler)
> don't show this warnings, but the CONFIG_DEBUG_STACK_USAGE is enabled.

Sorry, I couldn't tell that you were asking more than that.

In 2.6.22, CONFIG_DEBUG_STACK_USAGE only causes output during
sysrq-W (show blocked state).

In 2.6.24-rc, CONFIG_DEBUG_STACK_USAGE also causes output during
process exit, which is what you are seeing.

Does that help?

---
~Randy
desserts:  http://www.xenotime.net/linux/recipes/
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