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| author | Jinjie Ruan <ruanjinjie@huawei.com> | 2023-09-18 20:09:51 +0800 |
|---|---|---|
| committer | Andrew Morton <akpm@linux-foundation.org> | 2023-10-04 10:32:32 -0700 |
| commit | a0ce79253a96ee6bbcce90775ed342ef3153c68e (patch) | |
| tree | 1c5368cdb063e59d759c9afa1912c40d0092cd94 /mm/damon | |
| parent | f950fa6ec6d2c058c64d364df5a460d1a0f16e96 (diff) | |
| download | linux-stable-a0ce79253a96ee6bbcce90775ed342ef3153c68e.tar.gz linux-stable-a0ce79253a96ee6bbcce90775ed342ef3153c68e.tar.bz2 linux-stable-a0ce79253a96ee6bbcce90775ed342ef3153c68e.zip | |
mm/damon/core-test: fix memory leak in damon_new_ctx()
When CONFIG_DAMON_KUNIT_TEST=y and making CONFIG_DEBUG_KMEMLEAK=y and
CONFIG_DEBUG_KMEMLEAK_AUTO_SCAN=y, the below memory leak is detected.
The damon_ctx which is allocated by kzalloc() in damon_new_ctx() in
damon_test_ops_registration() and damon_test_set_attrs() are not freed.
So use damon_destroy_ctx() to free it. After applying this patch, the
following memory leak is never detected
unreferenced object 0xffff2b49c6968800 (size 512):
comm "kunit_try_catch", pid 350, jiffies 4294895294 (age 557.028s)
hex dump (first 32 bytes):
88 13 00 00 00 00 00 00 a0 86 01 00 00 00 00 00 ................
00 87 93 03 00 00 00 00 0a 00 00 00 00 00 00 00 ................
backtrace:
[<0000000088e71769>] slab_post_alloc_hook+0xb8/0x368
[<0000000073acab3b>] __kmem_cache_alloc_node+0x174/0x290
[<00000000b5f89cef>] kmalloc_trace+0x40/0x164
[<00000000eb19e83f>] damon_new_ctx+0x28/0xb4
[<00000000daf6227b>] damon_test_ops_registration+0x34/0x328
[<00000000559c4801>] kunit_try_run_case+0x50/0xac
[<000000003932ed49>] kunit_generic_run_threadfn_adapter+0x20/0x2c
[<000000003c3e9211>] kthread+0x124/0x130
[<0000000028f85bdd>] ret_from_fork+0x10/0x20
unreferenced object 0xffff2b49c1a9cc00 (size 512):
comm "kunit_try_catch", pid 356, jiffies 4294895306 (age 557.000s)
hex dump (first 32 bytes):
88 13 00 00 00 00 00 00 a0 86 01 00 00 00 00 00 ................
00 00 00 00 00 00 00 00 0a 00 00 00 00 00 00 00 ................
backtrace:
[<0000000088e71769>] slab_post_alloc_hook+0xb8/0x368
[<0000000073acab3b>] __kmem_cache_alloc_node+0x174/0x290
[<00000000b5f89cef>] kmalloc_trace+0x40/0x164
[<00000000eb19e83f>] damon_new_ctx+0x28/0xb4
[<00000000058495c4>] damon_test_set_attrs+0x30/0x1a8
[<00000000559c4801>] kunit_try_run_case+0x50/0xac
[<000000003932ed49>] kunit_generic_run_threadfn_adapter+0x20/0x2c
[<000000003c3e9211>] kthread+0x124/0x130
[<0000000028f85bdd>] ret_from_fork+0x10/0x20
Link: https://lkml.kernel.org/r/20230918120951.2230468-3-ruanjinjie@huawei.com
Fixes: d1836a3b2a9a ("mm/damon/core-test: initialise context before test in damon_test_set_attrs()")
Fixes: 4f540f5ab4f2 ("mm/damon/core-test: add a kunit test case for ops registration")
Signed-off-by: Jinjie Ruan <ruanjinjie@huawei.com>
Reviewed-by: Feng Tang <feng.tang@intel.com>
Reviewed-by: SeongJae Park <sj@kernel.org>
Cc: Brendan Higgins <brendan.higgins@linux.dev>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'mm/damon')
| -rw-r--r-- | mm/damon/core-test.h | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/mm/damon/core-test.h b/mm/damon/core-test.h index 3959be35b901..649adf91ebc5 100644 --- a/mm/damon/core-test.h +++ b/mm/damon/core-test.h @@ -269,6 +269,8 @@ static void damon_test_ops_registration(struct kunit *test) /* Check double-registration failure again */ KUNIT_EXPECT_EQ(test, damon_register_ops(&ops), -EINVAL); + + damon_destroy_ctx(c); } static void damon_test_set_regions(struct kunit *test) @@ -346,6 +348,8 @@ static void damon_test_set_attrs(struct kunit *test) invalid_attrs = valid_attrs; invalid_attrs.aggr_interval = 4999; KUNIT_EXPECT_EQ(test, damon_set_attrs(c, &invalid_attrs), -EINVAL); + + damon_destroy_ctx(c); } static void damon_test_moving_sum(struct kunit *test) |