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Date:      Fri, 6 Aug 2010 14:11:31 +0300
From:      Kostik Belousov <kostikbel@gmail.com>
To:        Marius Strobl <marius@alchemy.franken.de>
Cc:        FreeBSD Hackers <freebsd-hackers@freebsd.org>, Jeremie Le Hen <jeremie@le-hen.org>, nwhitehorn@freebsd.org
Subject:   Re: Avoiding sysctl at program startup using ELF aux vector (was: concurrent sysctl implementation)
Message-ID:  <20100806111131.GN22295@deviant.kiev.zoral.com.ua>
In-Reply-To: <20100806110807.GA68489@alchemy.franken.de>
References:  <20100806050633.GK14016@felucia.tataz.chchile.org> <20100806090404.GI22295@deviant.kiev.zoral.com.ua> <20100806110807.GA68489@alchemy.franken.de>

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On Fri, Aug 06, 2010 at 01:08:08PM +0200, Marius Strobl wrote:
> On Fri, Aug 06, 2010 at 12:04:04PM +0300, Kostik Belousov wrote:
> > On Fri, Aug 06, 2010 at 07:06:33AM +0200, Jeremie Le Hen wrote:
> > > Hi Kib,
> > >=20
> > > In-Reply-To: <20100629083901.GG13238@deviant.kiev.zoral.com.ua>
> > > On Tue, Jun 29, 2010 at 11:39:01AM +0300, Kostik Belousov wrote:
> > > > On Tue, Jun 29, 2010 at 10:26:39AM +0200, Marius Strobl wrote:
> > > > > On Mon, Jun 28, 2010 at 05:48:59PM +0300, Kostik Belousov wrote:
> > > > > > On Wed, Jun 23, 2010 at 11:09:59PM +0200, Jeremie Le Hen wrote:
> > > > > > > Hi Kostik,
> > > > > > >=20
> > > > > > > This patch seems to have faded out from memory.  Is it possib=
le to go
> > > > > > > forward and commit it?
> > > > > > I refreshed the patch. Hopefully, nobody will object, and I com=
mit it
> > > > > > shortly.
> > > > > >=20
> > > > > > >=20
> > > > > > > Thanks,
> > > > > > > Regards.
> > > > > > >=20
> > > > > > > On Sat, Jul 25, 2009 at 12:29:16AM +0300, Kostik Belousov wro=
te:
> > > > > > > > Below is the prototype that seems to work for me both with =
patched and
> > > > > > > > old rtld on i386. Patch also contains bits for amd64 that I=
 did not
> > > > > > > > tested yet. All other arches are not buildable for now.
> > > > > > > >=20
> > > > > > > > Patch completely eliminates sysctl syscalls from the rtld a=
nd libc
> > > > > > > > startup. Without the patch, a single run of /bin/ls did 6 s=
ysctls,
> > > > > > > > with the patch, no sysctls is queried at all.
> > > > > > > >=20
> > > > > > Comparing with the originally posted patch, I added support for=
 all
> > > > > > architectures, tested amd64 and ia32 on amd64, and converted ge=
tpagesizes(3)
> > > > > > that added two more startup sysctls.
> > > > > >=20
> > > > > > Would be nice to get a testing for at least some !x86 architect=
ures
> > > > > > before the commit, I added some people who helped me in past, t=
o the Cc:.
> > > > > >=20
> > > > >=20
> > > > > Doesn't look good on sparc64:
> > > > > <...>
> > > > > NFS ROOT: 192.168.1.40:/usr/data/nfsroot/sparc64
> > > > > dc1: link state changed to UP
> > > > > pid 24 (ifconfig), uid 0: exited on signal 11
> > > > > Segmentation fault
> > > > > Interface  IP-Address  Broadcast
> > > > > pid 29 (rcorder), uid 0: exited on signal 11
> > > > > Segmentation fault
> > > > > pid 30 (grep), uid 0: exited on signal 11
> > > > > Segmentation fault
> > > > > pid 31 (rcorder), uid 0: exited on signal 11
> > > > > Segmentation fault
> > > > > =20
> > > > > pid 32 (date), uid 0: exited on signal 11
> > > > > Segmentation fault
> > > > > Jun 29 12:20:50 getty[36]: open /dev/ttyv3: No such file or direc=
tory
> > > > > <...>
> > > > >=20
> > > > > Unfortunately, I currently lack the time to debug this.
> > > >=20
> > > > Thank you.
> > >=20
> > > Did yu have time to look at this problem?  It would be nice to have t=
his
> > > in the tree.
> >=20
> > I cannot move forward without the help from somebody having access to
> > sparc64 system where the problem is reproducable.
>=20
> Do you have a debug version of the patch which outputs the necessary
> information?

I would suggest to build rtld and libc with debugging symbols and
get full backtrace from the faults.

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