diff options
| author | Xiaolei Wang <xiaolei.wang@windriver.com> | 2023-08-15 17:41:27 +0300 |
|---|---|---|
| committer | Andrew Morton <akpm@linux-foundation.org> | 2023-08-21 23:38:02 +0300 |
| commit | 835bc157da689f834d10296d0942aed88b310b4f (patch) | |
| tree | ed31ac856d1197ca4e8fd6bf1a6b1b87e2ced1b3 /mm/kmemleak.c | |
| parent | b348b5fe2b5f14ac8bb64fe271d7a027db8cc674 (diff) | |
| download | linux-835bc157da689f834d10296d0942aed88b310b4f.tar.xz | |
mm/kmemleak: use object_cache instead of kmemleak_initialized to check in set_track_prepare()
Patch series "mm/kmemleak: use object_cache instead of
kmemleak_initialized", v3.
Use object_cache instead of kmemleak_initialized to check in
set_track_prepare(), so that memory leaks after kmemleak_init() can be
recorded and Rename kmemleak_initialized to kmemleak_late_initialized
unreferenced object 0xc674ca80 (size 64):
comm "swapper/0", pid 1, jiffies 4294938337 (age 204.880s)
hex dump (first 32 bytes):
80 55 75 c6 80 54 75 c6 00 55 75 c6 80 52 75 c6 .Uu..Tu..Uu..Ru.
00 53 75 c6 00 00 00 00 00 00 00 00 00 00 00 00 .Su..........
This patch (of 2):
kmemleak_initialized is set in kmemleak_late_init(), which also means that
there is no call trace which object's memory leak is before
kmemleak_late_init(), so use object_cache instead of kmemleak_initialized
to check in set_track_prepare() to avoid no call trace records when there
is a memory leak in the code between kmemleak_init() and
kmemleak_late_init().
unreferenced object 0xc674ca80 (size 64):
comm "swapper/0", pid 1, jiffies 4294938337 (age 204.880s)
hex dump (first 32 bytes):
80 55 75 c6 80 54 75 c6 00 55 75 c6 80 52 75 c6 .Uu..Tu..Uu..Ru.
00 53 75 c6 00 00 00 00 00 00 00 00 00 00 00 00 .Su..........
Link: https://lkml.kernel.org/r/20230815144128.3623103-1-xiaolei.wang@windriver.com
Link: https://lkml.kernel.org/r/20230815144128.3623103-2-xiaolei.wang@windriver.com
Fixes: 56a61617dd22 ("mm: use stack_depot for recording kmemleak's backtrace")
Signed-off-by: Xiaolei Wang <xiaolei.wang@windriver.com>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Cc: Alexander Potapenko <glider@google.com>
Cc: Andrey Konovalov <andreyknvl@gmail.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Zhaoyang Huang <zhaoyang.huang@unisoc.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'mm/kmemleak.c')
| -rw-r--r-- | mm/kmemleak.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/mm/kmemleak.c b/mm/kmemleak.c index a2d34226e3c8..16fc7b0984b9 100644 --- a/mm/kmemleak.c +++ b/mm/kmemleak.c @@ -610,7 +610,12 @@ static noinline depot_stack_handle_t set_track_prepare(void) unsigned long entries[MAX_TRACE]; unsigned int nr_entries; - if (!kmemleak_initialized) + /* + * Use object_cache to determine whether kmemleak_init() has + * been invoked. stack_depot_early_init() is called before + * kmemleak_init() in mm_core_init(). + */ + if (!object_cache) return 0; nr_entries = stack_trace_save(entries, ARRAY_SIZE(entries), 3); trace_handle = stack_depot_save(entries, nr_entries, GFP_NOWAIT); |