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Shijie Luo 9bc7647fe6 ext4: add cond_resched() to ext4_protect_reserved_inode commit `af133ade9a` upstream. When journal size is set too big by "mkfs.ext4 -J size=", or when we mount a crafted image to make journal inode->i_size too big, the loop, "while (i < num)", holds cpu too long. This could cause soft lockup. [ 529.357541] Call trace: [ 529.357551] dump_backtrace+0x0/0x198 [ 529.357555] show_stack+0x24/0x30 [ 529.357562] dump_stack+0xa4/0xcc [ 529.357568] watchdog_timer_fn+0x300/0x3e8 [ 529.357574] __hrtimer_run_queues+0x114/0x358 [ 529.357576] hrtimer_interrupt+0x104/0x2d8 [ 529.357580] arch_timer_handler_virt+0x38/0x58 [ 529.357584] handle_percpu_devid_irq+0x90/0x248 [ 529.357588] generic_handle_irq+0x34/0x50 [ 529.357590] __handle_domain_irq+0x68/0xc0 [ 529.357593] gic_handle_irq+0x6c/0x150 [ 529.357595] el1_irq+0xb8/0x140 [ 529.357599] __ll_sc_atomic_add_return_acquire+0x14/0x20 [ 529.357668] ext4_map_blocks+0x64/0x5c0 [ext4] [ 529.357693] ext4_setup_system_zone+0x330/0x458 [ext4] [ 529.357717] ext4_fill_super+0x2170/0x2ba8 [ext4] [ 529.357722] mount_bdev+0x1a8/0x1e8 [ 529.357746] ext4_mount+0x44/0x58 [ext4] [ 529.357748] mount_fs+0x50/0x170 [ 529.357752] vfs_kern_mount.part.9+0x54/0x188 [ 529.357755] do_mount+0x5ac/0xd78 [ 529.357758] ksys_mount+0x9c/0x118 [ 529.357760] __arm64_sys_mount+0x28/0x38 [ 529.357764] el0_svc_common+0x78/0x130 [ 529.357766] el0_svc_handler+0x38/0x78 [ 529.357769] el0_svc+0x8/0xc [ 541.356516] watchdog: BUG: soft lockup - CPU#0 stuck for 23s! [mount:18674] Link: https://lore.kernel.org/r/20200211011752.29242-1-luoshijie1@huawei.com Reviewed-by: Jan Kara <jack@suse.cz> Signed-off-by: Shijie Luo <luoshijie1@huawei.com> Signed-off-by: Theodore Ts'o <tytso@mit.edu> Cc: stable@kernel.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		History 2020-02-19 19:54:03 +01:00
arch	x86/alternatives: add missing insn.h include	2020-02-14 16:53:05 -05:00
block	compat: scsi: sg: fix v3 compat read/write interface	2020-02-11 04:37:17 -08:00
certs	certs: Add wrapper function to check blacklisted binary hash	2019-11-12 12:25:50 +11:00
crypto	crypto: testmgr - don't try to decrypt uninitialized buffers	2020-02-14 16:53:04 -05:00
Documentation	dt-bindings: iio: adc: ad7606: Fix wrong maxItems value	2020-02-14 16:53:05 -05:00
drivers	ACPI: PM: s2idle: Prevent spurious SCIs from waking up the system	2020-02-19 19:54:02 +01:00
fs	ext4: add cond_resched() to ext4_protect_reserved_inode	2020-02-19 19:54:03 +01:00
include	ACPICA: Introduce acpi_any_gpe_status_set()	2020-02-19 19:54:02 +01:00
init	Revert "um: Enable CONFIG_CONSTRUCTORS"	2020-02-01 09:33:00 +00:00
ipc	ipc/msg.c: consolidate all xxxctl_down() functions	2020-02-11 04:36:39 -08:00
kernel	ACPI: PM: s2idle: Avoid possible race related to the EC GPE	2020-02-19 19:54:01 +01:00
lib	lib/test_kasan.c: fix memory leak in kmalloc_oob_krealloc_more()	2020-02-11 04:36:45 -08:00
LICENSES	LICENSES: Rename other to deprecated	2019-05-03 06:34:32 -06:00
mm	mm/mmu_gather: invalidate TLB correctly on batch allocation failure and flush	2020-02-11 04:37:14 -08:00
net	bpf, sockmap: Check update requirements after locking	2020-02-14 16:53:00 -05:00
samples	samples/bpf: Reintroduce missed build targets	2020-02-11 04:37:00 -08:00
scripts	scripts/find-unused-docs: Fix massive false positives	2020-02-11 04:36:53 -08:00
security	selinux: fall back to ref-walk if audit is required	2020-02-14 16:53:07 -05:00
sound	ALSA: usb-audio: Apply sample rate quirk for Audioengine D1	2020-02-19 19:54:01 +01:00
tools	tools/power/acpi: fix compilation error	2020-02-14 16:53:02 -05:00
usr	gen_initramfs_list.sh: fix 'bad variable name' error	2020-01-04 00:00:48 +09:00
virt	KVM: arm64: Treat emulated TVAL TimerValue as a signed 32-bit integer	2020-02-14 16:53:04 -05:00
.clang-format	clang-format: Update with the latest for_each macro list	2019-08-31 10:00:51 +02:00
.cocciconfig	scripts: add Linux .cocciconfig for coccinelle	2016-07-22 12:13:39 +02:00
.get_maintainer.ignore	Opt out of scripts/get_maintainer.pl	2019-05-16 10:53:40 -07:00
.gitattributes	.gitattributes: use 'dts' diff driver for dts files	2019-12-04 19:44:11 -08:00
.gitignore	modpost: dump missing namespaces into a single modules.nsdeps file	2019-11-11 20:10:01 +09:00
.mailmap	MAINTAINERS: update my email address	2020-01-11 14:33:39 -08:00
COPYING	COPYING: use the new text with points to the license files	2018-03-23 12:41:45 -06:00
CREDITS	Linux 5.4-rc4	2019-10-29 04:43:29 -06:00
Kbuild	kbuild: do not descend to ./Kbuild when cleaning	2019-08-21 21:03:58 +09:00
Kconfig	docs: kbuild: convert docs to ReST and rename to *.rst	2019-06-14 14:21:21 -06:00
MAINTAINERS	MAINTAINERS: correct entries for ISDN/mISDN section	2020-02-11 04:36:38 -08:00
Makefile	Linux 5.5.4	2020-02-14 16:53:07 -05:00
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.