linux-kernel - Re: commit 64ff3b938ec6782e6585a83d5459b98b0c3f6eb8 breaks rlogin

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Message-ID: <20090209211737.GA13831@gondor.apana.org.au>
Date:	Tue, 10 Feb 2009 08:17:37 +1100
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
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, Feb 09, 2009 at 07:44:56AM -0800, Linus Torvalds wrote:
>
> 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.

Ah yes, I knew the strace didn't tally with the reported behaviour,
but I'd been focusing on the SIGURG and missed the clone.  Thanks!
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