Date: Thu, 08 Apr 2004 12:43:35 -0400 From: "Brian F. Feldman" <green@FreeBSD.org> To: Robert Watson <rwatson@FreeBSD.org> Cc: current@FreeBSD.org Subject: Re: panic on one cpu leaves others running... Message-ID: <200404081643.i38GhZhX092335@green.homeunix.org> In-Reply-To: Message from Robert Watson <rwatson@FreeBSD.org> <Pine.NEB.3.96L.1040408121438.47476B-100000@fledge.watson.org>
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Robert Watson <rwatson@FreeBSD.org> wrote: > > On Thu, 8 Apr 2004, Brian F. Feldman wrote: > > > Robert Watson <rwatson@FreeBSD.org> wrote: > > > > > > panic: m 0 so->so_rcv.sb_cc 17 > > > at line 860 in file ../../../kern/uipc_socket.c > > > > What made you receive that panic? I remember having that exact panic > > (sb_cc size being a little different, obviously) months ago... and > > having it disappear. Did you have networking out from Giant where it > > shouldn't have yet been? ;) > > This is running without Giant over most of the network stack. However, > I'm still working on tracking down the source of the problem -- I'm > beginning to wonder if it's not an existing race opened up by releasing > locks in areas where only memory allocations required sleeping would have > opened the race previously. I got this panic during local UNIX domain > socket IPC between the sshd bits. I suspect what's going on, but need to > look in more detail, is that something is messed up relating to control > mbufs -- I.e., ancillary data transfer. If you're interested in taking a > look at the current work-in-progress, take a look at the rwatson_netperf > branch in perforce, or at: > > http://www.watson.org/~robert/freebsd/netperf/ > > I can also add you to the CC list for new patch versions if you like. > Pretty shortly, I'll be sending them to arch@ instead, but I need to > resolve a few problems in socket locking (including this one). My first suspicion would also be MT_CONTROL botches. I'll take a look, since I'm recently re-familiarized with soreceive (turning mbuf tags into control messages... *barf*). I'll just check it out from perforce if I get the time to start running more than one branch :) -- Brian Fundakowski Feldman \'[ FreeBSD ]''''''''''\ <> green@FreeBSD.org \ The Power to Serve! \ Opinions expressed are my own. \,,,,,,,,,,,,,,,,,,,,,,\
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