Date: Thu, 8 Apr 2004 12:22:42 -0400 (EDT) From: Robert Watson <rwatson@FreeBSD.org> To: "Brian F. Feldman" <green@FreeBSD.org> Cc: current@FreeBSD.org Subject: Re: panic on one cpu leaves others running... Message-ID: <Pine.NEB.3.96L.1040408121438.47476B-100000@fledge.watson.org> In-Reply-To: <200404081610.i38GA05d072719@green.homeunix.org>
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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). Robert N M Watson FreeBSD Core Team, TrustedBSD Projects robert@fledge.watson.org Senior Research Scientist, McAfee Research > > -- > Brian Fundakowski Feldman \'[ FreeBSD ]''''''''''\ > <> green@FreeBSD.org \ The Power to Serve! \ > Opinions expressed are my own. \,,,,,,,,,,,,,,,,,,,,,,\ > > >
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