[PATCHv4 2/2] mm: use stack_depot_early_init for kmemleak

["zhaoyang.huang" <zhaoyang.huang@unisoc.com>]

From: Zhaoyang Huang <zhaoyang.huang@unisoc.com>

Mirsad report bellow error which caused by stack_depot_init failed in kvcalloc.
Solve this by having stackdepot use stack_depot_early_init.

On 1/4/23 17:08, Mirsad Goran Todorovac wrote:
I hate to bring bad news again, but there seems to be a problem with the output of /sys/kernel/debug/kmemleak:

[root@pc-mtodorov ~]# cat /sys/kernel/debug/kmemleak
unreferenced object 0xffff951c118568b0 (size 16):
comm "kworker/u12:2", pid 56, jiffies 4294893952 (age 4356.548s)
hex dump (first 16 bytes):
    6d 65 6d 73 74 69 63 6b 30 00 00 00 00 00 00 00 memstick0.......
    backtrace:
[root@pc-mtodorov ~]#

Apparently, backtrace of called functions on the stack is no longer printed with the list of memory leaks.
This appeared on Lenovo desktop 10TX000VCR, with AlmaLinux 8.7 and BIOS version M22KT49A (11/10/2022)
and 6.2-rc1 and 6.2-rc2 builds.
This worked on 6.1 with the same CONFIG_KMEMLEAK=y and MGLRU enabled on a vanilla mainstream kernel
from Mr. Torvalds' tree. I don't know if this is deliberate feature for some reason or a bug.
Please find attached the config, lshw and kmemleak output.

reported-by: Mirsad Todorovac <mirsad.todorovac@alu.unizg.hr>
suggested-by: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Zhaoyang Huang <zhaoyang.huang@unisoc.com>
---
v2: use stack_depot_want_early_init instead of CONFIG_STACKDEPOT_ALWAYS_INIT
v3: have the Kconfig changes commited in another patch
v4: select CONFIG_STACKDEPOT_ALWAYS_INIT when DEBUG_KMEMLEAK_DEFAULT_OFF is off
---

Signed-off-by: Zhaoyang Huang <zhaoyang.huang@unisoc.com>
---
 mm/Kconfig.debug | 1 +
 mm/kmemleak.c    | 4 +++-
 2 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/mm/Kconfig.debug b/mm/Kconfig.debug
index d1893ac..466a37e 100644
--- a/mm/Kconfig.debug
+++ b/mm/Kconfig.debug
@@ -219,6 +219,7 @@ config DEBUG_KMEMLEAK
 	select KALLSYMS
 	select CRC32
 	select STACKDEPOT
+	select STACKDEPOT_ALWAYS_INIT if !DEBUG_KMEMLEAK_DEFAULT_OFF
 	help
 	  Say Y here if you want to enable the memory leak
 	  detector. The memory allocation/freeing is traced in a way
diff --git a/mm/kmemleak.c b/mm/kmemleak.c
index 762b91f..ddc1ddf 100644
--- a/mm/kmemleak.c
+++ b/mm/kmemleak.c
@@ -2070,8 +2070,10 @@ static int __init kmemleak_boot_config(char *str)
 		return -EINVAL;
 	if (strcmp(str, "off") == 0)
 		kmemleak_disable();
-	else if (strcmp(str, "on") == 0)
+	else if (strcmp(str, "on") == 0) {
 		kmemleak_skip_disable = 1;
+		stack_depot_want_early_init();
+	}
 	else
 		return -EINVAL;
 	return 0;
-- 
1.9.1