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Lu Jialin e134f3aba9 crypto: pcrypt - Fix hungtask for PADATA_RESET [ Upstream commit `8f4f68e788` ] We found a hungtask bug in test_aead_vec_cfg as follows: INFO: task cryptomgr_test:391009 blocked for more than 120 seconds. "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. Call trace: __switch_to+0x98/0xe0 __schedule+0x6c4/0xf40 schedule+0xd8/0x1b4 schedule_timeout+0x474/0x560 wait_for_common+0x368/0x4e0 wait_for_completion+0x20/0x30 wait_for_completion+0x20/0x30 test_aead_vec_cfg+0xab4/0xd50 test_aead+0x144/0x1f0 alg_test_aead+0xd8/0x1e0 alg_test+0x634/0x890 cryptomgr_test+0x40/0x70 kthread+0x1e0/0x220 ret_from_fork+0x10/0x18 Kernel panic - not syncing: hung_task: blocked tasks For padata_do_parallel, when the return err is 0 or -EBUSY, it will call wait_for_completion(&wait->completion) in test_aead_vec_cfg. In normal case, aead_request_complete() will be called in pcrypt_aead_serial and the return err is 0 for padata_do_parallel. But, when pinst->flags is PADATA_RESET, the return err is -EBUSY for padata_do_parallel, and it won't call aead_request_complete(). Therefore, test_aead_vec_cfg will hung at wait_for_completion(&wait->completion), which will cause hungtask. The problem comes as following: (padata_do_parallel) \| rcu_read_lock_bh(); \| err = -EINVAL; \| (padata_replace) \| pinst->flags \|= PADATA_RESET; err = -EBUSY \| if (pinst->flags & PADATA_RESET) \| rcu_read_unlock_bh() \| return err In order to resolve the problem, we replace the return err -EBUSY with -EAGAIN, which means parallel_data is changing, and the caller should call it again. v3: remove retry and just change the return err. v2: introduce padata_try_do_parallel() in pcrypt_aead_encrypt and pcrypt_aead_decrypt to solve the hungtask. Signed-off-by: Lu Jialin <lujialin4@huawei.com> Signed-off-by: Guo Zihua <guozihua@huawei.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by: Sasha Levin <sashal@kernel.org>		2023-11-28 17:14:46 +00:00
arch	arm64: dts: ls208xa: use a pseudo-bus to constrain usb dma size	2023-11-28 17:14:46 +00:00
block	blk-core: use pr_warn_ratelimited() in bio_check_ro()	2023-11-20 11:57:23 +01:00
certs	KEYS: Add missing function documentation	2023-04-24 16:15:52 +03:00
crypto	crypto: pcrypt - Fix hungtask for PADATA_RESET	2023-11-28 17:14:46 +00:00
Documentation	smp,csd: Throw an error if a CSD lock is stuck for too long	2023-11-28 17:14:41 +00:00
drivers	drm/amd: check num of link levels when update pcie param	2023-11-28 17:14:46 +00:00
fs	btrfs: abort transaction on generation mismatch when marking eb as dirty	2023-11-28 17:14:40 +00:00
include	ASoC: SOF: Pass PCI SSID to machine driver	2023-11-28 17:14:46 +00:00
init	x86/retpoline: Make sure there are no unconverted return thunks due to KCSAN	2023-11-28 17:14:40 +00:00
io_uring	io_uring/net: ensure socket is marked connected on connect retry	2023-11-20 11:57:25 +01:00
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	crypto: pcrypt - Fix hungtask for PADATA_RESET	2023-11-28 17:14:46 +00:00
lib	lib/generic-radix-tree.c: Don't overflow in peek()	2023-11-28 17:14:40 +00:00
LICENSES	LICENSES: Add the copyleft-next-0.3.1 license	2022-11-08 15:44:01 +01:00
mm	vfs: fix readahead(2) on block devices	2023-11-20 11:56:43 +01:00
net	Bluetooth: Fix double free in hci_conn_cleanup	2023-11-28 17:14:43 +00:00
rust	rust: types: make `Opaque` be `!Unpin`	2023-11-08 14:09:04 +01:00
samples	samples/hw_breakpoint: fix building without module unloading	2023-09-23 11:14:33 +02:00
scripts	x86/retpoline: Make sure there are no unconverted return thunks due to KCSAN	2023-11-28 17:14:40 +00:00
security	apparmor: fix invalid reference on profile->disconnected	2023-11-20 11:57:12 +01:00
sound	ASoC: SOF: Pass PCI SSID to machine driver	2023-11-28 17:14:46 +00:00
tools	selftests/efivarfs: create-read: fix a resource leak	2023-11-28 17:14:46 +00:00
usr	initramfs: Encode dependency on KBUILD_BUILD_TIMESTAMP	2023-06-06 17:54:49 +09:00
virt	kvm/vfio: ensure kvg instance stays around in kvm_vfio_group_add()	2023-09-13 09:53:29 +02:00
.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	mailmap: add entries for Simon Horman	2023-08-16 09:53:10 +01:00
.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	sound fixes for 6.5	2023-08-25 08:48:14 -07:00
Makefile	Linux 6.5.12	2023-11-20 11:57:26 +01:00
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.