Attachment 168808 Details for Bug 204426 – Debugging patch to track the origin of OBJ_DEAD

[patch] Debugging patch to track the origin of OBJ_DEAD

2.patch (text/plain), 1.36 KB, created by Konstantin Belousov on 2016-03-31 08:13:25 UTC

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Creator: Konstantin Belousov

Created: 2016-03-31 08:13:25 UTC

Size: 1.36 KB

patch

obsolete

>Index: vm/vm_fault.c
>===================================================================
>--- vm/vm_fault.c	(revision 297444)
>+++ vm/vm_fault.c	(working copy)
>@@ -423,6 +423,8 @@ fast_failed:
> 		 * If the object is dead, we stop here
> 		 */
> 		if (fs.object->flags & OBJ_DEAD) {
>+printf("%d vm_fault OBJ_DEAD %p\n", curproc->p_pid, fs.object);
>+stack_print(&fs.object->dead_stack);
> 			unlock_and_deallocate(&fs);
> 			return (KERN_PROTECTION_FAILURE);
> 		}
>Index: vm/vm_object.c
>===================================================================
>--- vm/vm_object.c	(revision 297444)
>+++ vm/vm_object.c	(working copy)
>@@ -265,6 +265,7 @@ _vm_object_allocate(objtype_t type, vm_pindex_t si
> 	LIST_INIT(&object->rvq);
> #endif
> 	umtx_shm_object_init(object);
>+stack_zero(&object->dead_stack);
> }
> 
> /*
>Index: vm/vm_object.h
>===================================================================
>--- vm/vm_object.h	(revision 297444)
>+++ vm/vm_object.h	(working copy)
>@@ -74,6 +74,8 @@
> 
> #include <vm/_vm_radix.h>
> 
>+#include <sys/stack.h>
>+
> /*
>  *	Types defined:
>  *
>@@ -175,6 +177,7 @@ struct vm_object {
> 	struct ucred *cred;
> 	vm_ooffset_t charge;
> 	void *umtx_data;
>+	struct stack dead_stack;
> };
> 
> /*
>@@ -257,6 +260,7 @@ static __inline void
> vm_object_set_flag(vm_object_t object, u_short bits)
> {
> 
>+if ((bits & OBJ_DEAD) != 0) stack_save(&object->dead_stack);
> 	object->flags |= bits;
> }
>

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Attachments on bug 204426: 167570 | 168808 | 168832 | 168870 | 168872 | 169679