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Sven Schnelle 6d559e70b3 workqueue: Fix selection of wake_cpu in kick_pool() commit `57a01eafdc` upstream. With cpu_possible_mask=0-63 and cpu_online_mask=0-7 the following kernel oops was observed: smp: Bringing up secondary CPUs ... smp: Brought up 1 node, 8 CPUs Unable to handle kernel pointer dereference in virtual kernel address space Failing address: 0000000000000000 TEID: 0000000000000803 [..] Call Trace: arch_vcpu_is_preempted+0x12/0x80 select_idle_sibling+0x42/0x560 select_task_rq_fair+0x29a/0x3b0 try_to_wake_up+0x38e/0x6e0 kick_pool+0xa4/0x198 __queue_work.part.0+0x2bc/0x3a8 call_timer_fn+0x36/0x160 __run_timers+0x1e2/0x328 __run_timer_base+0x5a/0x88 run_timer_softirq+0x40/0x78 __do_softirq+0x118/0x388 irq_exit_rcu+0xc0/0xd8 do_ext_irq+0xae/0x168 ext_int_handler+0xbe/0xf0 psw_idle_exit+0x0/0xc default_idle_call+0x3c/0x110 do_idle+0xd4/0x158 cpu_startup_entry+0x40/0x48 rest_init+0xc6/0xc8 start_kernel+0x3c4/0x5e0 startup_continue+0x3c/0x50 The crash is caused by calling arch_vcpu_is_preempted() for an offline CPU. To avoid this, select the cpu with cpumask_any_and_distribute() to mask __pod_cpumask with cpu_online_mask. In case no cpu is left in the pool, skip the assignment. tj: This doesn't fully fix the bug as CPUs can still go down between picking the target CPU and the wake call. Fixing that likely requires adding cpu_online() test to either the sched or s390 arch code. However, regardless of how that is fixed, workqueue shouldn't be picking a CPU which isn't online as that would result in unpredictable and worse behavior. Signed-off-by: Sven Schnelle <svens@linux.ibm.com> Fixes: `8639ecebc9` ("workqueue: Implement non-strict affinity scope for unbound workqueues") Cc: stable@vger.kernel.org # v6.6+ Signed-off-by: Tejun Heo <tj@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2024-05-17 12:15:02 +02:00
arch	arm64: dts: mediatek: mt8183-pico6: Fix bluetooth node	2024-05-17 12:14:51 +02:00
block	blk-iocost: do not WARN if iocg was already offlined	2024-05-17 12:14:50 +02:00
certs	This update includes the following changes:	2023-11-02 16:15:30 -10:00
crypto	Revert "crypto: pkcs7 - remove sha1 support"	2024-04-03 15:32:31 +02:00
Documentation	dt-bindings: net: mediatek: remove wrongly added clocks and SerDes	2024-05-17 12:14:54 +02:00
drivers	firewire: ohci: fulfill timestamp for some local asynchronous transaction	2024-05-17 12:15:00 +02:00
fs	btrfs: make sure that WRITTEN is set on all metadata blocks	2024-05-17 12:15:01 +02:00
include	mm/slab: make __free(kfree) accept error pointers	2024-05-17 12:15:01 +02:00
init	rust: make mutually exclusive with CFI_CLANG	2024-05-02 16:35:25 +02:00
io_uring	io_uring: Fix io_cqring_wait() not restoring sigmask on get_timespec64() failure	2024-04-27 17:12:47 +02:00
ipc	shm: Slim down dependencies	2023-12-20 19:26:31 -05:00
kernel	workqueue: Fix selection of wake_cpu in kick_pool()	2024-05-17 12:15:02 +02:00
lib	maple_tree: fix mas_empty_area_rev() null pointer dereference	2024-05-17 12:15:01 +02:00
LICENSES	LICENSES: Add the copyleft-next-0.3.1 license	2022-11-08 15:44:01 +01:00
mm	mm/slub: avoid zeroing outside-object freepointer for single free	2024-05-17 12:15:00 +02:00
net	mptcp: only allow set existing scheduler for net.mptcp.scheduler	2024-05-17 12:15:02 +02:00
rust	rust: macros: fix soundness issue in `module!` macro	2024-05-17 12:14:22 +02:00
samples	work around gcc bugs with 'asm goto' with outputs	2024-02-09 15:57:48 -08:00
scripts	kbuild: Disable KCSAN for autogenerated *.mod.c intermediaries	2024-05-17 12:14:39 +02:00
security	selinux: avoid dereference of garbage after mount failure	2024-04-10 16:38:01 +02:00
sound	ALSA: hda/realtek: Fix conflicting PCI SSID 17aa:386f for Lenovo Legion models	2024-05-17 12:15:00 +02:00
tools	selftests: test_bridge_neigh_suppress.sh: Fix failures due to duplicate MAC	2024-05-17 12:14:53 +02:00
usr	Kbuild updates for v6.8	2024-01-18 17:57:07 -08:00
virt	KVM: Always flush async #PF workqueue when vCPU is being destroyed	2024-04-03 15:32:03 +02:00
.clang-format	clang-format: Update with v6.7-rc4's `for_each` macro list	2023-12-08 23:54:38 +01:00
.cocciconfig
.editorconfig	Add .editorconfig file for basic formatting	2023-12-28 16:22:47 +09:00
.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	Add .editorconfig file for basic formatting	2023-12-28 16:22:47 +09:00
.mailmap	drm fixes for 6.8 final	2024-03-08 12:44:56 -08:00
.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	MAINTAINERS: supplement of zswap maintainers update	2024-01-25 23:52:21 -08:00
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	drm fixes for 6.8 final	2024-03-08 12:44:56 -08:00
Makefile	Linux 6.8.9	2024-05-02 16:35:35 +02:00
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.