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Hyeonggon Yoo 2839b0999c mm/kfence: reset PG_slab and memcg_data before freeing __kfence_pool When kfence fails to initialize kfence pool, it frees the pool. But it does not reset memcg_data and PG_slab flag. Below is a BUG because of this. Let's fix it by resetting memcg_data and PG_slab flag before free. [ 0.089149] BUG: Bad page state in process swapper/0 pfn:3d8e06 [ 0.089149] page:ffffea46cf638180 refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x3d8e06 [ 0.089150] memcg:ffffffff94a475d1 [ 0.089150] flags: 0x17ffffc0000200(slab\|node=0\|zone=2\|lastcpupid=0x1fffff) [ 0.089151] raw: 0017ffffc0000200 ffffea46cf638188 ffffea46cf638188 0000000000000000 [ 0.089152] raw: 0000000000000000 0000000000000000 00000000ffffffff ffffffff94a475d1 [ 0.089152] page dumped because: page still charged to cgroup [ 0.089153] Modules linked in: [ 0.089153] CPU: 0 PID: 0 Comm: swapper/0 Tainted: G B W 5.18.0-rc1+ #965 [ 0.089154] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.14.0-2 04/01/2014 [ 0.089154] Call Trace: [ 0.089155] <TASK> [ 0.089155] dump_stack_lvl+0x49/0x5f [ 0.089157] dump_stack+0x10/0x12 [ 0.089158] bad_page.cold+0x63/0x94 [ 0.089159] check_free_page_bad+0x66/0x70 [ 0.089160] __free_pages_ok+0x423/0x530 [ 0.089161] __free_pages_core+0x8e/0xa0 [ 0.089162] memblock_free_pages+0x10/0x12 [ 0.089164] memblock_free_late+0x8f/0xb9 [ 0.089165] kfence_init+0x68/0x92 [ 0.089166] start_kernel+0x789/0x992 [ 0.089167] x86_64_start_reservations+0x24/0x26 [ 0.089168] x86_64_start_kernel+0xa9/0xaf [ 0.089170] secondary_startup_64_no_verify+0xd5/0xdb [ 0.089171] </TASK> Link: https://lkml.kernel.org/r/YnPG3pQrqfcgOlVa@hyeyoo Fixes: `0ce20dd840` ("mm: add Kernel Electric-Fence infrastructure") Fixes: `8f0b364973` ("mm: kfence: fix objcgs vector allocation") Signed-off-by: Hyeonggon Yoo <42.hyeyoo@gmail.com> Reviewed-by: Marco Elver <elver@google.com> Reviewed-by: Muchun Song <songmuchun@bytedance.com> Cc: Alexander Potapenko <glider@google.com> Cc: Dmitry Vyukov <dvyukov@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>		History 2022-05-09 17:34:29 -07:00
arch	arm[64]/memremap: don't abuse pfn_valid() to ensure presence of linear map	2022-05-09 17:34:28 -07:00
block	block: don't print I/O error warning for dead disks	2022-04-15 06:33:03 -06:00
certs	Kbuild updates for v5.18	2022-03-31 11:59:03 -07:00
crypto	for-5.18/64bit-pi-2022-03-25	2022-03-26 12:01:35 -07:00
Documentation	Networking fixes for 5.18-rc5, including fixes from bluetooth, bpf	2022-04-28 12:34:50 -07:00
drivers	drm fixes for 5.18-rc5	2022-04-28 18:00:34 -07:00
fs	procfs: prevent unprivileged processes accessing fdinfo dir	2022-05-09 17:34:28 -07:00
include	Networking fixes for 5.18-rc5, including fixes from bluetooth, bpf	2022-04-28 12:34:50 -07:00
init	Kbuild updates for v5.18	2022-03-31 11:59:03 -07:00
ipc	fs: allocate inode by using alloc_inode_sb()	2022-03-22 15:57:03 -07:00
kernel	Networking fixes for 5.18-rc5, including fixes from bluetooth, bpf	2022-04-28 12:34:50 -07:00
lib	hex2bin: fix access beyond string end	2022-04-27 10:57:33 -07:00
LICENSES	LICENSES/LGPL-2.1: Add LGPL-2.1-or-later as valid identifiers	2021-12-16 14:33:10 +01:00
mm	mm/kfence: reset PG_slab and memcg_data before freeing __kfence_pool	2022-05-09 17:34:29 -07:00
net	tcp: fix F-RTO may not work correctly when receiving DSACK	2022-04-28 10:35:38 -07:00
samples	dma-mapping updates for Linux 5.18	2022-03-29 08:50:14 -07:00
scripts	hardening fixes for v5.18-rc3	2022-04-12 14:29:40 -10:00
security	hardening updates for v5.18-rc1-fix1	2022-03-31 11:43:01 -07:00
sound	ALSA: hda/realtek: Add quirk for Clevo NP70PNP	2022-04-21 21:23:47 +02:00
tools	Networking fixes for 5.18-rc5, including fixes from bluetooth, bpf	2022-04-28 12:34:50 -07:00
usr	Kbuild updates for v5.18	2022-03-31 11:59:03 -07:00
virt	KVM: SEV: add cache flush to solve SEV cache incoherency issues	2022-04-21 15:41:00 -04:00
.clang-format	genirq/msi: Make interrupt allocation less convoluted	2021-12-16 22:22:20 +01:00
.cocciconfig	scripts: add Linux .cocciconfig for coccinelle	2016-07-22 12:13:39 +02:00
.get_maintainer.ignore	Opt out of scripts/get_maintainer.pl	2019-05-16 10:53:40 -07:00
.gitattributes	.gitattributes: use 'dts' diff driver for dts files	2019-12-04 19:44:11 -08:00
.gitignore	.gitignore: ignore only top-level modules.builtin	2021-05-02 00:43:35 +09:00
.mailmap	mailmap: add entry for martyna.szapar-mudlaw@intel.com	2022-05-09 17:34:29 -07:00
COPYING	COPYING: state that all contributions really are covered by this file	2020-02-10 13:32:20 -08:00
CREDITS	MAINTAINERS: replace a Microchip AT91 maintainer	2022-02-09 11:30:01 +01:00
Kbuild	kbuild: rename hostprogs-y/always to hostprogs/always-y	2020-02-04 01:53:07 +09:00
Kconfig	kbuild: ensure full rebuild when the compiler is updated	2020-05-12 13:28:33 +09:00
MAINTAINERS	Networking fixes for 5.18-rc5, including fixes from bluetooth, bpf	2022-04-28 12:34:50 -07:00
Makefile	Linux 5.18-rc4	2022-04-24 14:51:22 -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.