On Saturday, May 12, 2018 4:59:38 PM CEST Larry Finger wrote:
> In kernel 4.17.0-rcX, kmemleak reports 9 leaks with tracebacks similat to
> the following:
>
> unreferenced object 0xffff880224a077e0 (size 72):
> comm "swapper/0", pid 1, jiffies 4294892358 (age 1022.636s)
> hex dump (first 32 bytes):
> 00 00 00 00 00 00 00 00 0e 01 01 00 00 00 00 01 ................
> 00 00 00 80 00 00 00 00 00 00 00 00 00 00 00 00 ................
> backtrace:
> [<000000004f506615>] acpi_ut_create_internal_object_dbg+0x4d/0x10e
> [<000000006e7730e3>] acpi_ds_build_internal_object+0xed/0x1cd
> [<00000000272b7c73>] acpi_ds_build_internal_package_obj+0x245/0x3a2
> [<000000000b64c50e>] acpi_ds_eval_data_object_operands+0x17b/0x21b
> [<00000000589647ac>] acpi_ds_exec_end_op+0x433/0x6c1
> [<000000001d69bcbf>] acpi_ps_parse_loop+0x926/0x9be
> [<000000005d6fa97d>] acpi_ps_parse_aml+0x1a2/0x4af
> [<00000000c4bef823>] acpi_ps_execute_table+0xbb/0x119
> [<00000000fd9632e4>] acpi_ns_execute_table+0x20c/0x260
> [<00000000e6ae17ac>] acpi_ns_parse_table+0x7d/0x1b3
> [<0000000008e1e148>] acpi_ns_load_table+0x8d/0x1c0
> [<000000009fc8346f>] acpi_tb_load_namespace+0x176/0x278
> [<0000000073f98b3b>] acpi_load_tables+0x6e/0xfd
> [<00000000d2ef13d2>] acpi_init+0x8c/0x340
> [<000000007da19d8d>] do_one_initcall+0x46/0x1fa
> [<0000000024681a1d>] kernel_init_freeable+0x1a2/0x237
>
> According to gdb, the offending code is
> object =
> acpi_ut_allocate_object_desc_dbg(module_name, line_number,
> component_id);
>
> As it is not possible to unload the acpi code to test that this is a real
> leak and not a false positive, and that only these 9 appear no matter how
> long the system is up, a kmemleak_not_leak(object) call is inserted.
>
> Cc: Rafael J. Wysocki <rjw@xxxxxxxxxxxxx>
> Cc: Len Brown <lenb@xxxxxxxxxx>
> Cc: linux-acpi@xxxxxxxxxxxxxxx
> Signed-off-by: Larry Finger <Larry.Finger@xxxxxxxxxxxx>
> ---
> drivers/acpi/acpica/utobject.c | 2 ++
> 1 file changed, 2 insertions(+)
>
> diff --git a/drivers/acpi/acpica/utobject.c b/drivers/acpi/acpica/utobject.c
> index 5b78fe08d7d7..ae6d8cc18cec 100644
> --- a/drivers/acpi/acpica/utobject.c
> +++ b/drivers/acpi/acpica/utobject.c
> @@ -8,6 +8,7 @@
> *****************************************************************************/
>
> #include <acpi/acpi.h>
> +#include <linux/kmemleak.h>
> #include "accommon.h"
> #include "acnamesp.h"
>
> @@ -70,6 +71,7 @@ union acpi_operand_object *acpi_ut_create_internal_object_dbg(const char
> if (!object) {
> return_PTR(NULL);
> }
> + kmemleak_not_leak(object);
>
> switch (type) {
> case ACPI_TYPE_REGION:
>
I've decided to apply this patch, thanks!
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