2.1.111 fix for debugger ptrace(PTRACE_ATTACH, ...) side-effects

[Eric PAIRE <e.paire@opengroup.org>]

Hi Linus,

As part of my development of gdb for multithreaded applications, I have
found bugs in the way the Linux kernel manages processes dynamicly attached
by a debugger.

The summary of the bugs, the SMP-safe fix explanation and the patch file
are all available at http://www.gr.opengroup.org/java/jdk/linux/kernel1.htm

Best regards,
-Eric
P.S. The patch file contains the fix against a clean 2.1.111
P.S.2 I have just seen that the 2.1.112 is out (and that a cleaner 2.1.113
	is about to be available :-) If you want me to adapt the fix for
	2.1.113 and test it on my 4-way SMP, just let me know. Right now,
	it works correctly on 2.1.111.
+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+ Eric PAIRE
Email : e.paire@gr.opengroup.org  | THE Open GROUP - Grenoble Research 
Institute
Phone : +33 (0) 476 63 48 71 	  | 2, avenue de Vignate
Fax   : +33 (0) 476 51 05 32	  | F-38610 Gieres      FRANCE



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