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Jinjie Ruan a0ce79253a 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: d1836a3b2a ("mm/damon/core-test: initialise context before test in damon_test_set_attrs()")
Fixes: 4f540f5ab4 ("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>
History 2023-10-04 10:32:32 -07:00
arch mips: use nth_page() in place of direct struct page manipulation 2023-10-04 10:32:29 -07:00
block block: fix kernel-doc for disk_force_media_change() 2023-09-26 00:43:34 -06:00
certs certs: Reference revocation list for all keyrings 2023-08-17 20:12:41 +00:00
crypto crypto: sm2 - Fix crash caused by uninitialized context 2023-09-20 13:10:10 +08:00
Documentation Docs/ABI/damon: update for DAMOS apply intervals 2023-10-04 10:32:32 -07:00
drivers mm: shrinker: convert shrinker_rwsem to mutex 2023-10-04 10:32:26 -07:00
fs fs: use nth_page() in place of direct struct page manipulation 2023-10-04 10:32:29 -07:00
include mm/damon/core: implement scheme-specific apply interval 2023-10-04 10:32:31 -07:00
init workqueue: Changes for v6.6 2023-09-01 16:06:32 -07:00
io_uring io_uring/fs: remove sqe->rw_flags checking from LINKAT 2023-09-29 03:07:09 -06:00
ipc Add x86 shadow stack support 2023-08-31 12:20:12 -07:00
kernel rcu: dynamically allocate the rcu-kfree shrinker 2023-10-04 10:32:24 -07:00
lib maple_tree: add MAS_UNDERFLOW and MAS_OVERFLOW states 2023-09-29 17:20:46 -07:00
LICENSES LICENSES: Add the copyleft-next-0.3.1 license 2022-11-08 15:44:01 +01:00
mm mm/damon/core-test: fix memory leak in damon_new_ctx() 2023-10-04 10:32:32 -07:00
net sunrpc: dynamically allocate the sunrpc_cred shrinker 2023-10-04 10:32:24 -07:00
rust Documentation work keeps chugging along; stuff for 6.6 includes: 2023-08-30 20:05:42 -07:00
samples VFIO updates for v6.6-rc1 2023-08-30 20:36:01 -07:00
scripts kbuild: remove stale code for 'source' symlink in packaging scripts 2023-10-01 23:06:06 +09:00
security selinux: fix handling of empty opts in selinux_fs_context_submount() 2023-09-12 17:31:08 -04:00
sound ASoC: Fixes for v6.6 2023-09-20 15:02:16 +02:00
tools selftests/damon/sysfs: test DAMOS apply intervals 2023-10-04 10:32:31 -07:00
usr initramfs: Encode dependency on KBUILD_BUILD_TIMESTAMP 2023-06-06 17:54:49 +09:00
virt ARM: 2023-09-07 13:52:20 -07:00
.clang-format iommu: Add for_each_group_device() 2023-05-23 08:15:51 +02:00
.cocciconfig scripts: add Linux .cocciconfig for coccinelle 2016-07-22 12:13:39 +02:00
.get_maintainer.ignore get_maintainer: add Alan to .get_maintainer.ignore 2022-08-20 15:17:44 -07:00
.gitattributes .gitattributes: set diff driver for Rust source code files 2023-05-31 17:48:25 +02:00
.gitignore kbuild: rpm-pkg: rename binkernel.spec to kernel.spec 2023-07-25 00:59:33 +09:00
.mailmap for-linus-2023083101 2023-09-01 12:31:44 -07:00
.rustfmt.toml rust: add .rustfmt.toml 2022-09-28 09:02:20 +02:00
COPYING COPYING: state that all contributions really are covered by this file 2020-02-10 13:32:20 -08:00
CREDITS USB: Remove Wireless USB and UWB documentation 2023-08-09 14:17:32 +02:00
Kbuild Kbuild updates for v6.1 2022-10-10 12:00:45 -07:00
Kconfig kbuild: ensure full rebuild when the compiler is updated 2020-05-12 13:28:33 +09:00
MAINTAINERS ARM: SoC fixes for 6.6 2023-09-30 18:41:37 -07:00
Makefile Linux 6.6-rc4 2023-10-01 14:15:13 -07:00
README Drop all 00-INDEX files from Documentation/ 2018-09-09 15:08:58 -06:00

README 

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.