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Li Lingfeng d483001206 dm thin metadata: Fix ABBA deadlock by resetting dm_bufio_client As described in commit `8111964f1b` ("dm thin: Fix ABBA deadlock between shrink_slab and dm_pool_abort_metadata"), ABBA deadlocks will be triggered because shrinker_rwsem currently needs to held by dm_pool_abort_metadata() as a side-effect of thin-pool metadata operation failure. The following three problem scenarios have been noticed: 1) Described by commit `8111964f1b` ("dm thin: Fix ABBA deadlock between shrink_slab and dm_pool_abort_metadata") 2) shrinker_rwsem and throttle->lock P1(drop cache) P2(kworker) drop_caches_sysctl_handler drop_slab shrink_slab down_read(&shrinker_rwsem) - LOCK A do_shrink_slab super_cache_scan prune_icache_sb dispose_list evict ext4_evict_inode ext4_clear_inode ext4_discard_preallocations ext4_mb_load_buddy_gfp ext4_mb_init_cache ext4_wait_block_bitmap __ext4_error ext4_handle_error ext4_commit_super ... dm_submit_bio do_worker throttle_work_update down_write(&t->lock) -- LOCK B process_deferred_bios commit metadata_operation_failed dm_pool_abort_metadata dm_block_manager_create dm_bufio_client_create register_shrinker down_write(&shrinker_rwsem) -- LOCK A thin_map thin_bio_map thin_defer_bio_with_throttle throttle_lock down_read(&t->lock) - LOCK B 3) shrinker_rwsem and wait_on_buffer P1(drop cache) P2(kworker) drop_caches_sysctl_handler drop_slab shrink_slab down_read(&shrinker_rwsem) - LOCK A do_shrink_slab ... ext4_wait_block_bitmap __ext4_error ext4_handle_error jbd2_journal_abort jbd2_journal_update_sb_errno jbd2_write_superblock submit_bh // LOCK B // RELEASE B do_worker throttle_work_update down_write(&t->lock) - LOCK B process_deferred_bios process_bio commit metadata_operation_failed dm_pool_abort_metadata dm_block_manager_create dm_bufio_client_create register_shrinker register_shrinker_prepared down_write(&shrinker_rwsem) - LOCK A bio_endio wait_on_buffer __wait_on_buffer Fix these by resetting dm_bufio_client without holding shrinker_rwsem. Fixes: `8111964f1b` ("dm thin: Fix ABBA deadlock between shrink_slab and dm_pool_abort_metadata") Cc: stable@vger.kernel.org Signed-off-by: Li Lingfeng <lilingfeng3@huawei.com> Signed-off-by: Mike Snitzer <snitzer@kernel.org>		2023-06-16 18:24:13 -04:00
arch	block: replace fmode_t with a block-specific type for block open flags	2023-06-12 08:04:05 -06:00
block	blk-mq: fix NULL dereference on q->elevator in blk_mq_elv_switch_none	2023-06-16 10:12:25 -06:00
certs	KEYS: Add missing function documentation	2023-04-24 16:15:52 +03:00
crypto	This push fixes the following problems:	2023-05-07 10:57:14 -07:00
Documentation	dm flakey: introduce random_read_corrupt and random_write_corrupt options	2023-06-16 18:24:13 -04:00
drivers	dm thin metadata: Fix ABBA deadlock by resetting dm_bufio_client	2023-06-16 18:24:13 -04:00
fs	splice: simplify a conditional in copy_splice_read	2023-06-16 10:08:08 -06:00
include	dm thin metadata: Fix ABBA deadlock by resetting dm_bufio_client	2023-06-16 18:24:13 -04:00
init	block: move the code to do early boot lookup of block devices to block/	2023-06-05 10:57:40 -06:00
io_uring	for-6.4/io_uring-2023-05-07	2023-05-07 10:00:09 -07:00
ipc	Merge branch 'work.namespace' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2023-02-24 19:20:07 -08:00
kernel	block: replace fmode_t with a block-specific type for block open flags	2023-06-12 08:04:05 -06:00
lib	iov_iter: remove iov_iter_get_pages and iov_iter_get_pages_alloc	2023-06-16 10:08:09 -06:00
LICENSES	LICENSES: Add the copyleft-next-0.3.1 license	2022-11-08 15:44:01 +01:00
mm	block: replace fmode_t with a block-specific type for block open flags	2023-06-12 08:04:05 -06:00
net	net: Make sock_splice_read() use copy_splice_read() by default	2023-05-24 08:42:16 -06:00
rust	Rust changes for v6.4	2023-04-30 11:20:22 -07:00
samples	LoongArch changes for v6.4	2023-05-04 12:40:16 -07:00
scripts	Locking changes in v6.4:	2023-05-05 12:56:55 -07:00
security	integrity-v6.4	2023-04-29 10:11:32 -07:00
sound	sound fixes for 6.4-rc1	2023-05-06 08:07:11 -07:00
tools	cxl fixes for v6.4-rc2	2023-05-14 12:32:34 -07:00
usr	initramfs: Check negative timestamp to prevent broken cpio archive	2023-04-16 17:37:01 +09:00
virt	s390:	2023-05-01 12:06:20 -07:00
.clang-format	cxl for v6.4	2023-04-30 11:51:51 -07:00
.cocciconfig
.get_maintainer.ignore	get_maintainer: add Alan to .get_maintainer.ignore	2022-08-20 15:17:44 -07:00
.gitattributes	.gitattributes: use 'dts' diff driver for *.dtso files	2023-02-26 15:28:23 +09:00
.gitignore	linux-kselftest-kunit-6.4-rc1	2023-04-24 12:31:32 -07:00
.mailmap	for-6.4/block-2023-05-06	2023-05-06 08:28:58 -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	A handful of late-arriving documentation fixes, plus one Spanish	2023-05-05 13:16:42 -07:00
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	Devicetree binding fixes for v6.4	2023-05-11 09:01:40 -05:00
Makefile	Linux 6.4-rc2	2023-05-14 12:51:40 -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.