dueling (s)printf()'s - what's the cure?

[Kostik Belousov]

On Fri, Feb 01, 2008 at 08:34:56PM -0800, Jeremy Chadwick wrote:
> On Fri, Feb 01, 2008 at 06:31:11PM -0800, Chris H. wrote:
> > I mentioned a problem with this once before, and was referred to
> > other threads that also talked about this. But I believe a recent
> > problem I was experiencing, may have been related to this:
> > [: -le: argument expected. So I'd like to bring it up again, in
> > hopes that someone might have a cure. Specifically, two printf()'s
> > are sent to the same line, which results in a /very/ hard line to
> > decipher.
> 
> The two problems you're discussing are entirely 100% unrelated to one
> another.  Please do not try and relate them, it will just confuse
> readers of both threads.
> 
> The problem with [/test on your system is something that's specific to
> your system.  I'm hoping the reinstall you're doing (see private mail)
> will alleviate this, and if it doesn't, something you're doing after the
> fresh install is causing it.  That should be discussed in the other
> thread and not here.
> 
> The problem with kernel printf()s being interwoven is documented in my
> "common issues" file, with numerous threads referenced -- see "Scrambled
> dmesg/kernel output" here:
> 
> http://jdc.parodius.com/freebsd/common_issues.txt
> 
> There is no fix or workaround for this problem.  Someone mentioned
> increasing PRINTF_BUFR_SIZE to 128, which does not fix the problem,
> nor diminish it in any way.
What X in the RELENG_X where PRINTF_BUFR_SIZE has no effect ?

This feature is not in the RELENG_6. Some time ago I made a backport,
see
http://people.freebsd.org/~kib/misc/releng_6_printf_bufr.2.patch

I was said that the patch introduces some strange packet corruption,
that I cannot test.
> 
> It's very important that people understand the interwoven kernel output
> is specific to stuff printed to the console at the kernel level (e.g. a
> driver/module, a piece of the kernel, etc.), and will not happen when
> doing something that's output via printf(3) from libc (e.g. output from
> "make buildworld", "yes", "ls -FRal /", and so on).
> 
> -- 
> | Jeremy Chadwick                                    jdc at parodius.com |
> | Parodius Networking                           http://www.parodius.com/ |
> | UNIX Systems Administrator                      Mountain View, CA, USA |
> | Making life hard for others since 1977.                  PGP: 4BD6C0CB |
> 
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