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Prakruthi Deepak Heragu a817f78ed6 arm64: paravirt: Use RCU read locks to guard stolen_time commit `19bef63f95` upstream. During hotplug, the stolen time data structure is unmapped and memset. There is a possibility of the timer IRQ being triggered before memset and stolen time is getting updated as part of this timer IRQ handler. This causes the below crash in timer handler - [ 3457.473139][ C5] Unable to handle kernel paging request at virtual address ffffffc03df05148 ... [ 3458.154398][ C5] Call trace: [ 3458.157648][ C5] para_steal_clock+0x30/0x50 [ 3458.162319][ C5] irqtime_account_process_tick+0x30/0x194 [ 3458.168148][ C5] account_process_tick+0x3c/0x280 [ 3458.173274][ C5] update_process_times+0x5c/0xf4 [ 3458.178311][ C5] tick_sched_timer+0x180/0x384 [ 3458.183164][ C5] __run_hrtimer+0x160/0x57c [ 3458.187744][ C5] hrtimer_interrupt+0x258/0x684 [ 3458.192698][ C5] arch_timer_handler_virt+0x5c/0xa0 [ 3458.198002][ C5] handle_percpu_devid_irq+0xdc/0x414 [ 3458.203385][ C5] handle_domain_irq+0xa8/0x168 [ 3458.208241][ C5] gic_handle_irq.34493+0x54/0x244 [ 3458.213359][ C5] call_on_irq_stack+0x40/0x70 [ 3458.218125][ C5] do_interrupt_handler+0x60/0x9c [ 3458.223156][ C5] el1_interrupt+0x34/0x64 [ 3458.227560][ C5] el1h_64_irq_handler+0x1c/0x2c [ 3458.232503][ C5] el1h_64_irq+0x7c/0x80 [ 3458.236736][ C5] free_vmap_area_noflush+0x108/0x39c [ 3458.242126][ C5] remove_vm_area+0xbc/0x118 [ 3458.246714][ C5] vm_remove_mappings+0x48/0x2a4 [ 3458.251656][ C5] __vunmap+0x154/0x278 [ 3458.255796][ C5] stolen_time_cpu_down_prepare+0xc0/0xd8 [ 3458.261542][ C5] cpuhp_invoke_callback+0x248/0xc34 [ 3458.266842][ C5] cpuhp_thread_fun+0x1c4/0x248 [ 3458.271696][ C5] smpboot_thread_fn+0x1b0/0x400 [ 3458.276638][ C5] kthread+0x17c/0x1e0 [ 3458.280691][ C5] ret_from_fork+0x10/0x20 As a fix, introduce rcu lock to update stolen time structure. Fixes: `75df529bec` ("arm64: paravirt: Initialize steal time when cpu is online") Cc: stable@vger.kernel.org Suggested-by: Will Deacon <will@kernel.org> Signed-off-by: Prakruthi Deepak Heragu <quic_pheragu@quicinc.com> Signed-off-by: Elliot Berman <quic_eberman@quicinc.com> Reviewed-by: Srivatsa S. Bhat (VMware) <srivatsa@csail.mit.edu> Link: https://lore.kernel.org/r/20220513174654.362169-1-quic_eberman@quicinc.com Signed-off-by: Will Deacon <will@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2022-05-25 09:17:56 +02:00
arch	arm64: paravirt: Use RCU read locks to guard stolen_time	2022-05-25 09:17:56 +02:00
block	block-map: add __GFP_ZERO flag for alloc_page in function bio_copy_kern	2022-05-12 12:25:45 +02:00
certs	certs: Trigger creation of RSA module signing key if it's not an RSA key	2021-09-15 09:50:29 +02:00
crypto	crypto: authenc - Fix sleep in atomic context in decrypt_tail	2022-04-08 14:39:59 +02:00
Documentation	Revert "swiotlb: fix info leak with DMA_FROM_DEVICE"	2022-05-25 09:17:55 +02:00
drivers	PCI/PM: Avoid putting Elo i2 PCIe Ports in D3cold	2022-05-25 09:17:55 +02:00
fs	nilfs2: fix lockdep warnings during disk space reclamation	2022-05-25 09:17:54 +02:00
include	Revert "swiotlb: fix info leak with DMA_FROM_DEVICE"	2022-05-25 09:17:55 +02:00
init	init/main.c: return 1 from handled __setup() functions	2022-04-13 21:01:01 +02:00
ipc	shm: extend forced shm destroy to support objects from several IPC nses	2021-12-01 09:19:10 +01:00
kernel	perf: Fix sys_perf_event_open() race against self	2022-05-25 09:17:55 +02:00
lib	dim: initialize all struct fields	2022-05-18 10:23:44 +02:00
LICENSES	LICENSES/deprecated: add Zlib license text	2020-09-16 14:33:49 +02:00
mm	mm: userfaultfd: fix missing cache flush in mcopy_atomic_pte() and __mcopy_atomic()	2022-05-15 20:00:09 +02:00
net	SUNRPC: Fix fall-through warnings for Clang	2022-05-18 10:23:49 +02:00
samples	samples/bpf, xdpsock: Fix race when running for fix duration of time	2022-04-08 14:40:21 +02:00
scripts	gcc-plugins: latent_entropy: use /dev/urandom	2022-04-20 09:23:26 +02:00
security	selinux: fix bad cleanup on error in hashtab_duplicate()	2022-05-25 09:17:55 +02:00
sound	ALSA: hda/realtek: Add quirk for TongFang devices with pop noise	2022-05-25 09:17:55 +02:00
tools	tools/virtio: compile with -pthread	2022-05-25 09:17:53 +02:00
usr	usr/include/Makefile: add linux/nfc.h to the compile-test coverage	2022-02-01 17:25:48 +01:00
virt	KVM: Prevent module exit until all VMs are freed	2022-04-08 14:40:38 +02:00
.clang-format	RDMA 5.10 pull request	2020-10-17 11:18:18 -07:00
.cocciconfig
.get_maintainer.ignore
.gitattributes	.gitattributes: use 'dts' diff driver for dts files	2019-12-04 19:44:11 -08:00
.gitignore	kbuild: generate Module.symvers only when vmlinux exists	2021-05-19 10:12:59 +02:00
.mailmap	mailmap: add two more addresses of Uwe Kleine-König	2020-12-06 10:19:07 -08:00
COPYING	COPYING: state that all contributions really are covered by this file	2020-02-10 13:32:20 -08:00
CREDITS	MAINTAINERS: Move Jason Cooper to CREDITS	2020-11-30 10:20:34 +01:00
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	MAINTAINERS: adjust GCC PLUGINS after gcc-plugin.sh removal	2021-12-14 11:32:46 +01:00
Makefile	Linux 5.10.117	2022-05-18 10:23:49 +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.