Date: Sun, 18 Feb 2007 22:50:57 +0200 (EET) From: Dmitry Pryanishnikov <dmitry@atlantis.dp.ua> To: Kris Kennaway <kris@obsecurity.org> Cc: stable@freebsd.org, Ian Smith <smithi@nimnet.asn.au>, Joe Vender <jvender@owensboro.net>, Michael Nottebrock <lofi@freebsd.org> Subject: Re: pppd crashes, was: kde-freebsd] Question about KPPP on FreeBSD Message-ID: <20070218220725.K986@atlantis.atlantis.dp.ua> In-Reply-To: <20070218193845.GA54412@xor.obsecurity.org> References: <200702071933.35688.lofi@freebsd.org> <Pine.BSF.3.96.1070208170852.12110A-100000@gaia.nimnet.asn.au> <20070208075657.GA98754@xor.obsecurity.org> <20070218192903.E47137@atlantis.atlantis.dp.ua> <20070218193845.GA54412@xor.obsecurity.org>
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On Sun, 18 Feb 2007, Kris Kennaway wrote: >> http://www.freebsd.org/cgi/query-pr.cgi?pr=109277 >> >> The problem looks like a lack of proper locking during the operations with >> clist (specifically, this causes multiple entry to cblock_alloc()). >> I'm ready to provide further debugging information on this issue. >> Unfortunately, I'm not familiar enough with the locking concepts >> in modern FreeBSD kernels (and in tty subsystem particularly) >> in order to make the fix myself. > > ...and that's the problem :) You could do this additional work, but > you'd be wasting your time. I don't believe that nobody _knows_ how to serialize clist-related work within ppp(4) properly. I would rather believe that nobody (at least, among the src-commiters) _cares_ about it. Well, given the presence of working alternatives to ppp(4), this situation seems to be quite explainable. OTOH I still think that my PR could be useful in two aspects: 1) it clearly documents ppp(4) as broken in it's current state so wise people won't use it in production environment; 2) it can be useful for some hypothetical courageous person who will try to fix the problem. > Kris Sincerely, Dmitry -- Atlantis ISP, System Administrator e-mail: dmitry@atlantis.dp.ua nic-hdl: LYNX-RIPE
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