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mm: slub: panic for object and slab errors

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If the SLUB_DEBUG_PANIC_ON Kconfig option is
selected, also panic for object and slab
errors to allow capturing relevant debug
data.

Change-Id: Idc582ef48d3c0d866fa89cf8660ff0a5402f7e15
Signed-off-by: David Keitel <dkeitel@codeaurora.org>
This commit is contained in:
David Keitel 2014-10-21 16:26:17 -07:00
parent 08c53911c5
commit 4d976899f7
1 changed files with 12 additions and 4 deletions
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16
mm/slub.c
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@ -613,11 +613,21 @@ static void print_trailer(struct kmem_cache *s, struct page *page, u8 *p)
dump_stack();
}
#ifdef CONFIG_SLUB_DEBUG_PANIC_ON
static void slab_panic(const char *cause)
{
panic("%s\n", cause);
}
#else
static inline void slab_panic(const char *cause) {}
#endif
static void object_err(struct kmem_cache *s, struct page *page,
u8 *object, char *reason)
{
slab_bug(s, "%s", reason);
print_trailer(s, page, object);
slab_panic(reason);
}
static void slab_err(struct kmem_cache *s, struct page *page, const char *fmt, ...)
@ -631,6 +641,7 @@ static void slab_err(struct kmem_cache *s, struct page *page, const char *fmt, .
slab_bug(s, "%s", buf);
print_page_info(page);
dump_stack();
slab_panic("slab error");
}
static void init_object(struct kmem_cache *s, void *object, u8 val)
@ -649,12 +660,9 @@ static void init_object(struct kmem_cache *s, void *object, u8 val)
static void restore_bytes(struct kmem_cache *s, char *message, u8 data,
void *from, void *to)
{
#ifdef CONFIG_SLUB_DEBUG_PANIC_ON
panic("Found corruption 0x%p-0x%p=0x%x\n", from, to - 1, data);
#else
slab_panic("object poison overwritten");
slab_fix(s, "Restoring 0x%p-0x%p=0x%x\n", from, to - 1, data);
memset(from, data, to - from);
#endif
}
static int check_bytes_and_report(struct kmem_cache *s, struct page *page,