[PANIC] today's cvs with KTRACE and MUTEX_PROFILING enabled
csujun at 263.net
Mon Jan 26 07:27:05 PST 2004
----- Original Message -----
From: "Robert Watson" <rwatson at freebsd.org>
To: "Jun Su" <csujun at 263.net>
Cc: <current at freebsd.org>
Sent: Monday, January 26, 2004 11:16 PM
Subject: Re: [PANIC] today's cvs with KTRACE and MUTEX_PROFILING enabled
> On Mon, 26 Jan 2004, Jun Su wrote:
> > > On Mon, 26 Jan 2004, Jun Su wrote:
> > >
> > > > I got the following panic when booting. Seems the if_data_mutex is
> > > > corrupt by something.If you need any information, please feel free
> > > > let me know. Thanks.
> > >
> > > Are you running with kernel modules? If so, were all of them built as
> > > part of your kernel build? Turning on mutex profiling changes the
> > > the mutex structure, so if you have modules that aren't built to be
> > > of mutex profiling, you will get memory corruption. When using mutex
> > > profiling, I would generally suggest avoiding the use of kernel
> > > since it avoids the whole issue...
> > Yes. This is the root cause. Our module building env doesn't include
> > opt_global.h. Then the module's mtx doesn't match the one in Kernel. I
> > this is a requirement for MUTEX_PROFILING, not a suggestion before we
> > complete the new building env for kernel module. I suggest to add this
> > man page. What is your option?
> The following text appears in the NOTES section of MUTEX_PROFILING.9:
> The MUTEX_PROFILING option increases the size of struct mtx, so a
> kernel built with that option will not work with modules built
> without it.
> We can probably make this a little more explicit by specifically
> mentioning opt_global.h.
I think there is some misleading in this para. Since when we build modules,
the opt_global.h will not be included. The modules build with
MUTEX_PROFILING option also doesn't work. Am I right? I think I have some
confused about the kernel modukes building options.
> Robert N M Watson FreeBSD Core Team, TrustedBSD Projects
> robert at fledge.watson.org Senior Research Scientist, McAfee Research
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