Re: 2.6.15-rc1-mm1 panic in ptrace_check_attach()

[Christoph Hellwig <hch@infradead.org>]

On Fri, Nov 18, 2005 at 09:56:40AM -0800, Badari Pulavarty wrote:
> Hi Andrew,
> 
> I am not sure if its already reported. I get panic in
> ptrace_check_attach() while trying to run UML on 2.6.15-rc1-mm1.
> 
> Going to try 2.6.15-rc1-mm2 now. 

Looks like 2.6.15-rc1-mm1 has total crap in ptrace_get_task_struct
(and it looks like my fault because I sent out a wrong patch).

The patch below should fix it:

Index: linux-2.6/kernel/ptrace.c
===================================================================
--- linux-2.6.orig/kernel/ptrace.c	2005-11-18 10:25:35.000000000 +0100
+++ linux-2.6/kernel/ptrace.c	2005-11-18 10:25:54.000000000 +0100
@@ -459,7 +459,7 @@
 	read_unlock(&tasklist_lock);
 	if (!child)
 		return ERR_PTR(-ESRCH);
-	return 0;
+	return child;
 }
 
 #ifndef __ARCH_SYS_PTRACE
-
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