Add a tracepoint to log slab corruption messages to the trace log also so
that it's easier to correlate with other trace messages that are being used
to track refcounting.
Signed-off-by: David Howells <dhowells@xxxxxxxxxx>
---
include/trace/events/kmem.h | 23 +++++++++++++++++++++++
mm/slab.c | 2 ++
2 files changed, 25 insertions(+)
diff --git a/include/trace/events/kmem.h b/include/trace/events/kmem.h
index eb57e3037deb..c96f3b03a6e2 100644
--- a/include/trace/events/kmem.h
+++ b/include/trace/events/kmem.h
@@ -315,6 +315,29 @@ TRACE_EVENT(mm_page_alloc_extfrag,
__entry->change_ownership)
);
+TRACE_EVENT(slab_corruption,
+ TP_PROTO(const char *slab, void *object, unsigned int size, unsigned int offset),
+
+ TP_ARGS(slab, object, size, offset),
+
+ TP_STRUCT__entry(
+ __field( void *, object )
+ __field( unsigned int, size )
+ __field( unsigned int, offset )
+ __array( char, slab, 16 )
+ ),
+
+ TP_fast_assign(
+ strlcpy(__entry->slab, slab, sizeof(__entry->slab));
+ __entry->object = object;
+ __entry->size = size;
+ __entry->offset = offset;
+ ),
+
+ TP_printk("slab=%s obj=%px size=%x off=%x",
+ __entry->slab, __entry->object, __entry->size, __entry->offset)
+);
+
#endif /* _TRACE_KMEM_H */
/* This part must be outside protection */
diff --git a/mm/slab.c b/mm/slab.c
index 9df370558e5d..47c5a86e39be 100644
--- a/mm/slab.c
+++ b/mm/slab.c
@@ -1527,6 +1527,8 @@ static void check_poison_obj(struct kmem_cache *cachep, void *objp)
print_tainted(), cachep->name,
realobj, size);
print_objinfo(cachep, objp, 0);
+ trace_slab_corruption(cachep->name, realobj,
+ size, i);
}
/* Hexdump the affected line */
i = (i / 16) * 16;
