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Yangtao Li 169134da41 f2fs: compress: fix to call f2fs_wait_on_page_writeback() in f2fs_write_raw_pages() [ Upstream commit `babedcbac1` ] BUG_ON() will be triggered when writing files concurrently, because the same page is writtenback multiple times. 1597 void folio_end_writeback(struct folio *folio) 1598 { ...... 1618 if (!__folio_end_writeback(folio)) 1619 BUG(); ...... 1625 } kernel BUG at mm/filemap.c:1619! Call Trace: <TASK> f2fs_write_end_io+0x1a0/0x370 blk_update_request+0x6c/0x410 blk_mq_end_request+0x15/0x130 blk_complete_reqs+0x3c/0x50 __do_softirq+0xb8/0x29b ? sort_range+0x20/0x20 run_ksoftirqd+0x19/0x20 smpboot_thread_fn+0x10b/0x1d0 kthread+0xde/0x110 ? kthread_complete_and_exit+0x20/0x20 ret_from_fork+0x22/0x30 </TASK> Below is the concurrency scenario: [Process A] [Process B] [Process C] f2fs_write_raw_pages() - redirty_page_for_writepage() - unlock page() f2fs_do_write_data_page() - lock_page() - clear_page_dirty_for_io() - set_page_writeback() [1st writeback] ..... - unlock page() generic_perform_write() - f2fs_write_begin() - wait_for_stable_page() - f2fs_write_end() - set_page_dirty() - lock_page() - f2fs_do_write_data_page() - set_page_writeback() [2st writeback] This problem was introduced by the previous commit `7377e85396` ("f2fs: compress: fix potential deadlock of compress file"). All pagelocks were released in f2fs_write_raw_pages(), but whether the page was in the writeback state was ignored in the subsequent writing process. Let's fix it by waiting for the page to writeback before writing. Cc: Christoph Hellwig <hch@lst.de> Fixes: `4c8ff7095b` ("f2fs: support data compression") Fixes: `7377e85396` ("f2fs: compress: fix potential deadlock of compress file") Signed-off-by: Qi Han <hanqi@vivo.com> Signed-off-by: Yangtao Li <frank.li@vivo.com> Reviewed-by: Chao Yu <chao@kernel.org> Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org> Signed-off-by: Sasha Levin <sashal@kernel.org>		History 2023-05-11 23:00:27 +09:00
arch	arm64: kgdb: Set PSTATE.SS to 1 to re-enable single-step	2023-05-11 23:00:24 +09:00
block	blk-crypto: make blk_crypto_evict_key() more robust	2023-05-11 23:00:16 +09:00
certs	certs/blacklist_hashes.c: fix const confusion in certs blacklist	2022-06-22 14:22:01 +02:00
crypto	crypto: api - Demote BUG_ON() in crypto_unregister_alg() to a WARN_ON()	2023-05-11 23:00:17 +09:00
Documentation	riscv: Move early dtb mapping into the fixmap region	2023-05-01 08:23:24 +09:00
drivers	scsi: megaraid: Fix mega_cmd_done() CMDID_INT_CMDS	2023-05-11 23:00:26 +09:00
fs	f2fs: compress: fix to call f2fs_wait_on_page_writeback() in f2fs_write_raw_pages()	2023-05-11 23:00:27 +09:00
include	scsi: target: Fix multiple LUN_RESET handling	2023-05-11 23:00:26 +09:00
init	kbuild: Add CONFIG_PAHOLE_VERSION	2023-02-25 12:06:45 +01:00
io_uring	io_uring: avoid null-ptr-deref in io_arm_poll_handler	2023-03-22 13:31:37 +01:00
ipc	ipc/sem: Fix dangling sem_array access in semtimedop race	2022-12-08 11:28:45 +01:00
kernel	bpf: Remove misleading spec_v1 check on var-offset stack read	2023-05-11 23:00:26 +09:00
lib	debugobject: Prevent init race with static objects	2023-05-11 23:00:25 +09:00
LICENSES	LICENSES/dual/CC-BY-4.0: Git rid of "smart quotes"	2021-07-15 06:31:24 -06:00
mm	writeback, cgroup: fix null-ptr-deref write in bdi_split_work_to_wbs	2023-05-11 23:00:18 +09:00
net	net/packet: convert po->auxdata to an atomic flag	2023-05-11 23:00:26 +09:00
samples	samples: vfio-mdev: Fix missing pci_disable_device() in mdpy_fb_probe()	2022-12-31 13:14:31 +01:00
scripts	ASN.1: Fix check for strdup() success	2023-04-26 13:51:56 +02:00
security	selinux: ensure av_permissions.h is built when needed	2023-05-11 23:00:19 +09:00
sound	sound/oss/dmasound: fix build when drivers are mixed =y/=m	2023-05-11 23:00:19 +09:00
tools	selftests/bpf: Fix a fd leak in an error path in network_helpers.c	2023-05-11 23:00:26 +09:00
usr	usr/include/Makefile: add linux/nfc.h to the compile-test coverage	2022-02-01 17:27:15 +01:00
virt	KVM: fix memoryleak in kvm_init()	2023-03-17 08:49:04 +01:00
.clang-format	clang-format: Update with the latest for_each macro list	2021-05-12 23:32:39 +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	.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	counter: Internalize sysfs interface code	2023-04-20 12:13:55 +02:00
Makefile	Linux 5.15.110	2023-05-01 08:23:24 +09:00
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.