WSL2-Linux-Kernel

The source for the Linux kernel used in Windows Subsystem for Linux 2 (WSL2)

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Hou Tao b44d28b98f bpf, cpumap: Make sure kthread is running before map update returns commit `640a604585` upstream. The following warning was reported when running stress-mode enabled xdp_redirect_cpu with some RT threads: ------------[ cut here ]------------ WARNING: CPU: 4 PID: 65 at kernel/bpf/cpumap.c:135 CPU: 4 PID: 65 Comm: kworker/4:1 Not tainted 6.5.0-rc2+ #1 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996) Workqueue: events cpu_map_kthread_stop RIP: 0010:put_cpu_map_entry+0xda/0x220 ...... Call Trace: <TASK> ? show_regs+0x65/0x70 ? __warn+0xa5/0x240 ...... ? put_cpu_map_entry+0xda/0x220 cpu_map_kthread_stop+0x41/0x60 process_one_work+0x6b0/0xb80 worker_thread+0x96/0x720 kthread+0x1a5/0x1f0 ret_from_fork+0x3a/0x70 ret_from_fork_asm+0x1b/0x30 </TASK> The root cause is the same as commit `4369016497` ("bpf: cpumap: Fix memory leak in cpu_map_update_elem"). The kthread is stopped prematurely by kthread_stop() in cpu_map_kthread_stop(), and kthread() doesn't call cpu_map_kthread_run() at all but XDP program has already queued some frames or skbs into ptr_ring. So when __cpu_map_ring_cleanup() checks the ptr_ring, it will find it was not emptied and report a warning. An alternative fix is to use __cpu_map_ring_cleanup() to drop these pending frames or skbs when kthread_stop() returns -EINTR, but it may confuse the user, because these frames or skbs have been handled correctly by XDP program. So instead of dropping these frames or skbs, just make sure the per-cpu kthread is running before __cpu_map_entry_alloc() returns. After apply the fix, the error handle for kthread_stop() will be unnecessary because it will always return 0, so just remove it. Fixes: `6710e11269` ("bpf: introduce new bpf cpu map type BPF_MAP_TYPE_CPUMAP") Signed-off-by: Hou Tao <houtao1@huawei.com> Reviewed-by: Pu Lehui <pulehui@huawei.com> Acked-by: Jesper Dangaard Brouer <hawk@kernel.org> Link: https://lore.kernel.org/r/20230729095107.1722450-2-houtao@huaweicloud.com Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2023-08-11 15:13:58 +02:00
Documentation	iommu/arm-smmu-v3: Document nesting-related errata	2023-08-11 15:13:49 +02:00
LICENSES	LICENSES/dual/CC-BY-4.0: Git rid of "smart quotes"	2021-07-15 06:31:24 -06:00
arch	arm64: dts: stratix10: fix incorrect I2C property for SCL signal	2023-08-11 15:13:56 +02:00
block	block/partition: fix signedness issue for Amiga partitions	2023-07-23 13:47:37 +02:00
certs	certs/blacklist_hashes.c: fix const confusion in certs blacklist	2022-06-22 14:22:01 +02:00
crypto	KEYS: asymmetric: Copy sig and digest in public_key_verify_signature()	2023-06-09 10:32:34 +02:00
drivers	drm/ttm: check null pointer before accessing when swapping	2023-08-11 15:13:57 +02:00
fs	open: make RESOLVE_CACHED correctly test for O_TMPFILE	2023-08-11 15:13:57 +02:00
include	vxlan: Fix nexthop hash size	2023-08-11 15:13:54 +02:00
init	x86/mm: Initialize text poking earlier	2023-08-08 19:58:33 +02:00
io_uring	io_uring: gate iowait schedule on having pending requests	2023-08-11 15:13:48 +02:00
ipc	ipc/sem: Fix dangling sem_array access in semtimedop race	2022-12-08 11:28:45 +01:00
kernel	bpf, cpumap: Make sure kthread is running before map update returns	2023-08-11 15:13:58 +02:00
lib	test_firmware: return ENOMEM instead of ENOSPC on failed memory allocation	2023-07-23 13:47:25 +02:00
mm	mm/damon/ops-common: atomically test and clear young on ptes and pmds	2023-07-23 13:47:47 +02:00
net	libceph: fix potential hang in ceph_osdc_notify()	2023-08-11 15:13:55 +02:00
samples	samples: ftrace: Save required argument registers in sample trampolines	2023-07-23 13:47:55 +02:00
scripts	kbuild: Disable GCOV for *.mod.o	2023-07-23 13:47:17 +02:00
security	security: keys: Modify mismatched function name	2023-07-27 08:47:01 +02:00
sound	ASoC: cs42l51: fix driver to properly autoload with automatic module loading	2023-08-03 10:22:47 +02:00
tools	perf test uprobe_from_different_cu: Skip if there is no gcc	2023-08-11 15:13:50 +02:00
usr	usr/include/Makefile: add linux/nfc.h to the compile-test coverage	2022-02-01 17:27:15 +01:00
virt	KVM: Grab a reference to KVM for VM and vCPU stats file descriptors	2023-08-03 10:22:40 +02:00
.clang-format	clang-format: Update with the latest for_each macro list	2021-05-12 23:32:39 +02:00
.cocciconfig	…
.get_maintainer.ignore	…
.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 Andrej Shadura	2021-10-18 20:22:03 -10:00
COPYING	COPYING: state that all contributions really are covered by this file	2020-02-10 13:32:20 -08:00
CREDITS	MAINTAINERS: Move Daniel Drake to credits	2021-09-21 08:34:58 +03:00
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	cifs: missing directory in MAINTAINERS file	2023-08-03 10:22:29 +02:00
Makefile	Linux 5.15.125	2023-08-08 19:58:35 +02:00
README	…

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.