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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 backtrace") Signed-off-by: Xiaolei Wang Reviewed-by: Catalin Marinas --- mm/kmemleak.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/mm/kmemleak.c b/mm/kmemleak.c index a2d34226e3c8..04bb4cdbb402 100644 --- a/mm/kmemleak.c +++ b/mm/kmemleak.c @@ -610,7 +610,8 @@ 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() is complete*/ + 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); From patchwork Tue Aug 15 05:13:58 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: xiaolei wang X-Patchwork-Id: 13353541 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on 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 c6cVcDSe 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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 04bb4cdbb402..5c8e5a24b890 100644 --- a/mm/kmemleak.c +++ b/mm/kmemleak.c @@ -218,7 +218,7 @@ static int kmemleak_enabled = 1; /* same as above but only for the kmemleak_free() callback */ static int kmemleak_free_enabled = 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 */ @@ -2053,7 +2053,7 @@ static void kmemleak_disable(void) kmemleak_enabled = 0; /* 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 = 0; @@ -2118,7 +2118,7 @@ void __init kmemleak_init(void) */ static int __init kmemleak_late_init(void) { - kmemleak_initialized = 1; + kmemleak_late_initialized = 1; debugfs_create_file("kmemleak", 0644, NULL, NULL, &kmemleak_fops); @@ -2126,7 +2126,7 @@ 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);