linux-kernel - Re: [RFC PATCH] set TASK_TRACED before arch

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Message-ID: <3877989d0805280214y645c7e0ex91a95f1fe47a6abf@mail.gmail.com>
Date:	Wed, 28 May 2008 17:14:28 +0800
From:	"Luming Yu" <luming.yu@...il.com>
To:	"Roland McGrath" <roland@...hat.com>
Cc:	"Petr Tesarik" <ptesarik@...e.cz>,
	LKML <linux-kernel@...r.kernel.org>, linux-ia64@...r.kernel.org
Subject: Re: [RFC PATCH] set TASK_TRACED before arch_ptrace code to fix a race

Some correction about the test case hang,  the ps output should looks
like the following:
13925 S+ strace -f ./test1
13926 S+ ./test1
13927 T+  /bin/bash ./test2

I'm trying upstream kdump to get more detailed data for help analysis
the scenario..
But unfortunately upstream kernel just hang when I echo c to
sysrq-trigger.  Downgrade the kernel to 2.6.22,  'echo c' doesn't
hang, but I just got "zero" dump file...
Will try F9 later... But from the symptom shouldn't we ask this
question: why  process 13927 can't wake up?  Roland,  please confirm
if ptrace_untrace is the only way to get Traced process wake up?  Back
up to caller of ptrace_untrace, maybe we can find out why my RFC patch
happen to fix the problem... Any suggestions are welcome!
--Luming
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