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charset="utf-8" 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.......... Fixes: 56a61617dd22 ("mm: use stack_depot for recording kmemleak's backtrac= e") Signed-off-by: Xiaolei Wang Reviewed-by: Catalin Marinas --- mm/kmemleak.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) 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; =20 - 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 =3D stack_trace_save(entries, ARRAY_SIZE(entries), 3); trace_handle =3D stack_depot_save(entries, nr_entries, GFP_NOWAIT); --=20 2.25.1 From nobody Thu Dec 18 00:05:47 2025 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id F2038C04E69 for ; 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charset="utf-8" The old name is confusing because it implies the completion of earlier kmemleak_init(), the new name update to kmemleak_late_initial represents the completion of kmemleak_late_init(). No functional changes. Signed-off-by: Xiaolei Wang Acked-by: Catalin Marinas --- mm/kmemleak.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/mm/kmemleak.c b/mm/kmemleak.c index 16fc7b0984b9..2918150e31bd 100644 --- a/mm/kmemleak.c +++ b/mm/kmemleak.c @@ -218,7 +218,7 @@ static int kmemleak_enabled =3D 1; /* same as above but only for the kmemleak_free() callback */ static int kmemleak_free_enabled =3D 1; /* set in the late_initcall if there were no errors */ -static int kmemleak_initialized; +static int kmemleak_late_initialized; /* set if a kmemleak warning was issued */ static int kmemleak_warning; /* set if a fatal kmemleak error has occurred */ @@ -2057,7 +2057,7 @@ static void kmemleak_disable(void) kmemleak_enabled =3D 0; =20 /* check whether it is too early for a kernel thread */ - if (kmemleak_initialized) + if (kmemleak_late_initialized) schedule_work(&cleanup_work); else kmemleak_free_enabled =3D 0; @@ -2122,7 +2122,7 @@ void __init kmemleak_init(void) */ static int __init kmemleak_late_init(void) { - kmemleak_initialized =3D 1; + kmemleak_late_initialized =3D 1; =20 debugfs_create_file("kmemleak", 0644, NULL, NULL, &kmemleak_fops); =20 @@ -2130,7 +2130,7 @@ static int __init kmemleak_late_init(void) /* * Some error occurred and kmemleak was disabled. There is a * small chance that kmemleak_disable() was called immediately - * after setting kmemleak_initialized and we may end up with + * after setting kmemleak_late_initialized and we may end up with * two clean-up threads but serialized by scan_mutex. */ schedule_work(&cleanup_work); --=20 2.25.1