[OpenAFS] Re: kernel panics with 1.6.0 and 1.6.1pre2 on openindiana

Logan O'Sullivan Bruns logan@gedanken.org
Sun, 29 Jan 2012 20:48:36 -0800

Thanks Andrew. The problem does indeed go away when I recompile with
--disable-optimize-kernel. It seems fine under load too. I really
appreciate you taking a look at this problem. Thanks!

  - logan

On Sun, Jan 29, 2012 at 04:52:29PM -0600, Andrew Deason wrote:
> On Fri, 27 Jan 2012 17:25:52 -0800
> "Logan O'Sullivan Bruns" <logan@gedanken.org> wrote:
> > I can't think of anything weird about it. At this point other then
> > OpenAFS it is still pretty close the basic 151a server install. I did
> > install Solaris Studio 12.3 to build OpenAFS.
> > 
> > $ /opt/SUNWspro/bin/cc -V
> > cc: Sun C 5.12 SunOS_i386 2011/11/16
> I think this is the important difference.
> $ /opt/SUNWspro/bin/cc -V
> cc: Sun C 5.11 SunOS_i386 2010/08/13
> I also forgot to ask which kernel module you were using. I assume you
> used libafs64.nonfs.o.
> > What did you use for your test system? If you used a VM did you
> > configure it as 64 bit with multiple processors and greater then a
> > gigabyte of memory (to trigger the 64 bit kernel install.)
> It's single-proc, but if that were the problem I'd expect this to be
> less consistent. It doesn't have that much memory, but it's easy enough
> to force it to boot 64-bit anyway.
> > Maybe you could email me the kernel module and afsd you used?
> This is what I was going to suggest depending on the details you
> provided. However, though I thought the machine was fine through a few
> reboots on Friday, when I went to get these files, it started panic'ing
> on boot every time. The panic location was the same, and in a very
> trivial section of code (copying some constants around to populate an
> error table). However, I noticed that there were some SSE-like
> instructions around that code segment that the compiler put in, so I was
> guessing that this may be due to compiler optimizations (I'm guessing
> maybe we can't use SSE stuff this earlier in the boot process or
> something? I didn't look into it, since we don't need them.)
> We've had trouble in the past with newer Studio performing optimizations
> that are not valid for kernel code (though this is the first I'm aware
> of such a thing causing a _panic_), and I think as new releases come
> out, more and more optimizations are done by default. I'll look at
> changing the flags we give for libafs compiles, but in the meantime...
> If I configure with --disable-optimize-kernel, the issue for me goes
> away. Can you try that? (please save the build commands/output) If that
> does not help, try the binaries I just sent you.
> -- 
> Andrew Deason
> adeason@sinenomine.net
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