netdev - Re: commit 64ff3b938ec6782e6585a83d5459b98b0c3f6eb8 breaks rlogin

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Date:	Mon, 9 Feb 2009 07:44:56 -0800 (PST)
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Herbert Xu <herbert@...dor.apana.org.au>
cc:	Jeff Chua <jeff.chua.linux@...il.com>,
	David Miller <davem@...emloft.net>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	lkml <linux-kernel@...r.kernel.org>, netdev@...r.kernel.org
Subject: Re: commit 64ff3b938ec6782e6585a83d5459b98b0c3f6eb8 breaks rlogin



On Mon, 9 Feb 2009, Herbert Xu wrote:
> 
> Then the problem isn't my patch at all.  My patch only affects
> the side sending the urgent data, according to your straces, rlogin
> is only receiving urgent data, not sending it.  So the patch cannot
> have an affect.

The trace is incolclusive about that - just look at it. It's not following 
threads/children etc, so it's missing all the relevant pieces.

Which you should have realized, Herbert, since you had the knowledge that 
your patch _DOES_ make a difference, enough to bisect to it, and enough 
to see that reverting it changes behaviour.

Why are you arguing against facts?

>From the trace:

	clone(child_stack=0, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0xb7d81918) = 6433
	rt_sigaction(SIGURG, {0x80491d0, [URG], SA_RESTART}, {SIG_DFL}, 8) = 0
	rt_sigaction(SIGUSR1, {0x8048de0, [USR1], SA_RESTART}, {SIG_DFL}, 8) = 0
	rt_sigprocmask(SIG_SETMASK, [], [USR1 URG], 8) = 0
	--- SIGURG (Urgent I/O condition) @ 0 (0) ---
	kill(6433, SIGURG)                      = 0

IOW, the trace isn't saying anything at all, because all the real work 
probably got done in that child process.

> No you're still stracing rlogin, which in this case is the receiver
> of the urgent data.  Please strace the sending side, which would be
> presumably be rlogind in this case.

Herbert, how sure are you that there is no URG data on that side?

You clearly spent _zero_ time actually looking at the trace, so...

		Linus
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