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charset="utf-8" The __stack_depot_save() may be used by some subsystems even before the stack depot is initialized. So add a check of stack_table in __stack_depot_save() to make sure no oops in this case. Fixes: 56a61617dd22 ("mm: use stack_depot for recording kmemleak's backtrac= e") Signed-off-by: Xiaolei Wang --- lib/stackdepot.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/lib/stackdepot.c b/lib/stackdepot.c index 2f5aa851834e..a0651d013a0d 100644 --- a/lib/stackdepot.c +++ b/lib/stackdepot.c @@ -376,7 +376,7 @@ depot_stack_handle_t __stack_depot_save(unsigned long *= entries, */ nr_entries =3D filter_irq_stacks(entries, nr_entries); =20 - if (unlikely(nr_entries =3D=3D 0) || stack_depot_disabled) + if (unlikely(nr_entries =3D=3D 0) || stack_depot_disabled || unlikely(!st= ack_table)) goto fast_exit; =20 hash =3D hash_stack(entries, nr_entries); --=20 2.25.1 From nobody Sun Feb 8 12:39:20 2026 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 55219C001DB for ; Thu, 10 Aug 2023 07:47:56 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233490AbjHJHrz (ORCPT ); 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charset="utf-8" The kmemleak_late_init() is defined as a late_initcall. The current implementation of set_track_prepare() depends on the kmemleak init. That also means there is no call trace for the memory leak which object is created before the kmemleak_late_init(). In a previous patch, we have fixed a bug in stack_depot_save() so that it can be invoked even before stack depot is initialized. So there is no reason to check the kmemleak_initialized in set_track_prepare(). So delete the kmemleak_initialized judgment in set_track_prepare() 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 --- mm/kmemleak.c | 2 -- 1 file changed, 2 deletions(-) diff --git a/mm/kmemleak.c b/mm/kmemleak.c index a2d34226e3c8..c9f2f816db19 100644 --- a/mm/kmemleak.c +++ b/mm/kmemleak.c @@ -610,8 +610,6 @@ static noinline depot_stack_handle_t set_track_prepare(= void) unsigned long entries[MAX_TRACE]; unsigned int nr_entries; =20 - if (!kmemleak_initialized) - 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 --=20 2.25.1