[Crash-utility] "invalid structure member offset: task_struct_parent" on x86_64 rawhide

[Dave Anderson]

Jeff Layton wrote:
> Looks like we might have gotten bitten by some upstream changes
> again...
> 
> When I run crash on a recent rawhide x86_64 kernel, I seem to be
> getting this error:
> 
> crash: invalid structure member offset: task_struct_parent
>        FILE: task.c  LINE: 2163  FUNCTION: store_context()
> 
> [/usr/bin/crash] error trace: 49150a => 495bb8 => 4963be => 4fc1bc
> /usr/bin/nm: /usr/bin/crash: no symbols
> /usr/bin/nm: /usr/bin/crash: no symbols
> /usr/bin/nm: /usr/bin/crash: no symbols
> /usr/bin/nm: /usr/bin/crash: no symbols
> 
> Relevant package versions:
> 
> crash-4.0-6.2.x86_64
> kernel-2.6.25-0.185.rc7.git6.fc9.x86_64
> 
> ...machine is a x86_64 FV xen guest. Any thoughts?
> 
> Thanks,

Yep, although the change is not upstream in Linus's tree, Roland's
linux-2.6-utrace.patch removes it in Fedora:

@@ -1070,18 +1063,26 @@ struct task_struct {
         /*
          * pointers to (original) parent process, youngest child, younger sibling,
          * older sibling, respectively.  (p->father can be replaced with
-        * p->parent->pid)
+        * p->real_parent->pid)
          */
-       struct task_struct *real_parent; /* real parent process (when being debugged) */
-       struct task_struct *parent;     /* parent process */
+       struct task_struct *real_parent; /* real parent process */
         /*
-        * children/sibling forms the list of my children plus the
-        * tasks I'm ptracing.
+        * children/sibling forms the list of my natural children
          */

AFAICT, task_struct.real_parent can be substituted.  Try the attached
patch.  (and then wait to see what else has been broken...)

Dave


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