Date: Thu, 8 Apr 2004 11:51:24 -0400 (EDT) From: Robert Watson <rwatson@freebsd.org> To: Marcel Moolenaar <marcel@xcllnt.net> Cc: current@freebsd.org Subject: Re: panic on one cpu leaves others running... Message-ID: <Pine.NEB.3.96L.1040408114813.47476A-100000@fledge.watson.org> In-Reply-To: <20040408154004.GA22500@dhcp01.pn.xcllnt.net>
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On Thu, 8 Apr 2004, Marcel Moolenaar wrote:
> On Thu, Apr 08, 2004 at 09:43:06AM -0400, Robert Watson wrote:
> >
> > On Wed, 7 Apr 2004, Marcel Moolenaar wrote:
> >
> > > On Thu, Apr 08, 2004 at 12:13:39AM -0400, Robert Watson wrote:
> > > >
> > > > Funky, eh? I thought we used to have code to ipi the other cpu's and halt
> > > > them until the cpu in ddb was out agian. I guess I mis-remember, or that
> > > > code is broken...
> > >
> > > You remember correctly.
> >
> > And it's still going this morning:
> *snip*
> > Apr 8 13:39:30 sm-mta[4707]: i3879Tjc003922: SYSERR(root): cannot
> > flock(/etc/mail/aliases, fd=5, type=1, omode=40000, euid=0): Operation not
> > supported
> >
> > Debugger(c07c3990) at Debugger+0x46
> > db>
>
> Do you have SMP and/or made modifications to <machine/smptests.h>?
> What's pcpu->pc_other_cpus and what is stopped_cpus currently?
No changes to smptests.h.
Unfortunately, I don't have access to serial gdb for this box, and causing
a dump might well change all that, so I only have the value of
stopped_cpus:
db> print stopped_cpus
c0950594
db> print *stopped_cpus
d
> > Presumably in large part because I'm in code that doesn't require Giant,
> > so there are no lock conflicts.
>
> I don't think that's the case. It think we're just not stopping the CPUs
> or keep them stopped.
I agree with that interpretation -- I was suggesting that the reason this
problem might not be noticed is that a lot of our code paths require
Giant, and it's only when you panic in code without Giant that
>
> This is all a hunch and I have no way to test this myself...
Robert N M Watson FreeBSD Core Team, TrustedBSD Projects
robert@fledge.watson.org Senior Research Scientist, McAfee Research
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