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SubjectRe: [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!

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