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Yu Kuai a865b96c51 Revert "md: unlock mddev before reap sync_thread in action_store" This reverts commit `9dfbdafda3`. Because it will introduce a defect that sync_thread can be running while MD_RECOVERY_RUNNING is cleared, which will cause some unexpected problems, for example: list_add corruption. prev->next should be next (ffff0001ac1daba0), but was ffff0000ce1a02a0. (prev=ffff0000ce1a02a0). Call trace: __list_add_valid+0xfc/0x140 insert_work+0x78/0x1a0 __queue_work+0x500/0xcf4 queue_work_on+0xe8/0x12c md_check_recovery+0xa34/0xf30 raid10d+0xb8/0x900 [raid10] md_thread+0x16c/0x2cc kthread+0x1a4/0x1ec ret_from_fork+0x10/0x18 This is because work is requeued while it's still inside workqueue: t1: t2: action_store mddev_lock if (mddev->sync_thread) mddev_unlock md_unregister_thread // first sync_thread is done md_check_recovery mddev_try_lock /* * once MD_RECOVERY_DONE is set, new sync_thread * can start. */ set_bit(MD_RECOVERY_RUNNING, &mddev->recovery) INIT_WORK(&mddev->del_work, md_start_sync) queue_work(md_misc_wq, &mddev->del_work) test_and_set_bit(WORK_STRUCT_PENDING_BIT, ...) // set pending bit insert_work list_add_tail mddev_unlock mddev_lock_nointr md_reap_sync_thread // MD_RECOVERY_RUNNING is cleared mddev_unlock t3: // before queued work started from t2 md_check_recovery // MD_RECOVERY_RUNNING is not set, a new sync_thread can be started INIT_WORK(&mddev->del_work, md_start_sync) work->data = 0 // work pending bit is cleared queue_work(md_misc_wq, &mddev->del_work) insert_work list_add_tail // list is corrupted The above commit is reverted to fix the problem, the deadlock this commit tries to fix will be fixed in following patches. Signed-off-by: Yu Kuai <yukuai3@huawei.com> Signed-off-by: Song Liu <song@kernel.org> Link: https://lore.kernel.org/r/20230529132037.2124527-2-yukuai1@huaweicloud.com		2023-07-27 00:13:28 -07:00
arch	Xtensa fixes for v6.5:	2023-07-16 14:12:49 -07:00
block	block: cleanup bio_integrity_prep	2023-07-25 20:30:54 -06:00
certs	KEYS: Add missing function documentation	2023-04-24 16:15:52 +03:00
crypto	crypto: algif_hash - Fix race between MORE and non-MORE sends	2023-07-08 22:48:42 +10:00
Documentation	SCSI fixes on 20230714	2023-07-14 19:57:29 -07:00
drivers	Revert "md: unlock mddev before reap sync_thread in action_store"	2023-07-27 00:13:28 -07:00
fs	Five smb3 client fixes	2023-07-16 12:49:05 -07:00
include	blk-flush: reuse rq queuelist in flush state machine	2023-07-17 08:18:21 -06:00
init	Kbuild updates for v6.5	2023-07-01 09:24:31 -07:00
io_uring	io_uring-6.5-2023-07-14	2023-07-14 19:46:54 -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	- Remove a cgroup from under a polling process properly	2023-07-16 13:22:08 -07:00
lib	iov_iter: Mark copy_iovec_from_user() noclone	2023-07-10 09:52:28 +02:00
LICENSES	LICENSES: Add the copyleft-next-0.3.1 license	2022-11-08 15:44:01 +01:00
mm	mm: lock newly mapped VMA with corrected ordering	2023-07-08 16:44:11 -07:00
net	A fix to prevent a potential buffer overrun in the messenger, marked	2023-07-14 09:05:15 -07:00
rust	rust: error: `impl Debug` for `Error` with `errname()` integration	2023-06-13 01:24:42 +02:00
samples	arm64: ftrace: Add direct call trampoline samples support	2023-07-10 17:51:54 -04:00
scripts	kallsyms: strip LTO-only suffixes from promoted global functions	2023-07-12 15:39:34 -07:00
security	+ Bug Fixes	2023-07-07 09:55:31 -07:00
sound	sound fixes for 6.5-rc1	2023-07-07 15:40:17 -07:00
tools	- Mark copy_iovec_from_user() __noclone in order to prevent gcc from	2023-07-16 13:34:29 -07:00
usr	initramfs: Encode dependency on KBUILD_BUILD_TIMESTAMP	2023-06-06 17:54:49 +09:00
virt	ARM64:	2023-07-03 15:32:22 -07:00
.clang-format	iommu: Add for_each_group_device()	2023-05-23 08:15:51 +02:00
.cocciconfig
.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	Revert ".gitignore: ignore .cover and .mbx"	2023-07-04 15:05:12 -07:00
.mailmap	spi: Fixes for v6.5	2023-07-15 08:51:02 -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	- Address -Wmissing-prototype warnings	2023-06-26 16:43:54 -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	hardening fixes for v6.5-rc2	2023-07-16 12:18:18 -07:00
Makefile	Linux 6.5-rc2	2023-07-16 15:10:37 -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.