Date: Sat, 04 Oct 2003 19:27:43 -0400 From: "Brian F. Feldman" <green@freebsd.org> To: Sam Leffler <sam@errno.com> Cc: hackers@freebsd.org Subject: Re: Is socket buffer locking as questionable as it seems? Message-ID: <200310042327.h94NRh0s005278@green.bikeshed.org> In-Reply-To: Message from Sam Leffler <sam@errno.com> of "Sat, 04 Oct 2003 11:39:52 PDT." <200310041139.52357.sam@errno.com>
next in thread | previous in thread | raw e-mail | index | archive | help
Sam Leffler <sam@errno.com> wrote: > On Friday 03 October 2003 10:38 pm, Brian Fundakowski Feldman wrote: > > I keep getting these panics on my SMP box (no backtrace or DDB or crash > > dump of course, because panic() == hang to FreeBSD these days): > > panic: receive: m == 0 so->so_rcv.sb_cc == 52 > > From what I can tell, all sorts of socket-related calls are "MP-safe" > > and yet never even come close to locking the socket buffer. From > > what I can tell, the easiest way for this occur would be sbrelease() > > being called from somewhere that it's supposed to, but doesn't, have > > sblock(). Has anyone seen these, or a place to start looking? Maybe > > a way to get panics to stop hanging the machine? TIA if anyone has > > some enlightenment. > > Haven't seen anything on my SMP test box. As Robert has already said sockets > are still implicitly locked by Giant. You need to provide more information > like what version you are running and what your system is doing when the > panic occurs. > > FWIW panic does not hang for me so you might first try to figure out why > that's occuring. I turned off sync on panic so maybe I'll be okay now. That never, ever, worked for me starting a couple years ago and I forgot I had it disabled locally. I see it immediately on boot and I couldn't tell you why; this is a NAT box, and a million other things. I'm running the most current current I can possibly run, of course. -- Brian Fundakowski Feldman \'[ FreeBSD ]''''''''''\ <> green@FreeBSD.org \ The Power to Serve! \ Opinions expressed are my own. \,,,,,,,,,,,,,,,,,,,,,,\
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?200310042327.h94NRh0s005278>