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Sahitya Tummala df13b0369b f2fs: fix sbi->extent_list corruption issue [ Upstream commit `e4589fa545` ] When there is a failure in f2fs_fill_super() after/during the recovery of fsync'd nodes, it frees the current sbi and retries again. This time the mount is successful, but the files that got recovered before retry, still holds the extent tree, whose extent nodes list is corrupted since sbi and sbi->extent_list is freed up. The list_del corruption issue is observed when the file system is getting unmounted and when those recoverd files extent node is being freed up in the below context. list_del corruption. prev->next should be fffffff1e1ef5480, but was (null) <...> kernel BUG at kernel/msm-4.14/lib/list_debug.c:53! lr : __list_del_entry_valid+0x94/0xb4 pc : __list_del_entry_valid+0x94/0xb4 <...> Call trace: __list_del_entry_valid+0x94/0xb4 __release_extent_node+0xb0/0x114 __free_extent_tree+0x58/0x7c f2fs_shrink_extent_tree+0xdc/0x3b0 f2fs_leave_shrinker+0x28/0x7c f2fs_put_super+0xfc/0x1e0 generic_shutdown_super+0x70/0xf4 kill_block_super+0x2c/0x5c kill_f2fs_super+0x44/0x50 deactivate_locked_super+0x60/0x8c deactivate_super+0x68/0x74 cleanup_mnt+0x40/0x78 __cleanup_mnt+0x1c/0x28 task_work_run+0x48/0xd0 do_notify_resume+0x678/0xe98 work_pending+0x8/0x14 Fix this by not creating extents for those recovered files if shrinker is not registered yet. Once mount is successful and shrinker is registered, those files can have extents again. Signed-off-by: Sahitya Tummala <stummala@codeaurora.org> Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org> Signed-off-by: Sasha Levin <sashal@kernel.org>		2019-02-12 19:47:17 +01:00
arch	um: Avoid marking pages with "changed protection"	2019-02-12 19:47:17 +01:00
block	block: use rcu_work instead of call_rcu to avoid sleep in softirq	2019-01-22 21:40:35 +01:00
certs	export.h: remove VMLINUX_SYMBOL() and VMLINUX_SYMBOL_STR()	2018-08-22 23:21:44 +09:00
crypto	crypto: aes_ti - disable interrupts while accessing S-box	2019-02-12 19:46:58 +01:00
Documentation	mm, proc: be more verbose about unstable VMA flags in /proc/<pid>/smaps	2019-01-26 09:32:44 +01:00
drivers	niu: fix missing checks of niu_pci_eeprom_read	2019-02-12 19:47:17 +01:00
firmware	kbuild: remove all dummy assignments to obj-	2017-11-18 11:46:06 +09:00
fs	f2fs: fix sbi->extent_list corruption issue	2019-02-12 19:47:17 +01:00
include	kvm: Change offset in kvm_write_guest_offset_cached to unsigned	2019-02-12 19:47:16 +01:00
init	kbuild: Disable LD_DEAD_CODE_DATA_ELIMINATION with ftrace & GCC <= 4.7	2019-01-22 21:40:34 +01:00
ipc	ipc/shm.c: use ERR_CAST() for shm_lock() error return	2018-10-05 16:32:04 -07:00
kernel	kobject: return error code if writing /sys/.../uevent fails	2019-02-12 19:47:06 +01:00
lib	seq_buf: Make seq_buf_puts() null-terminate the buffer	2019-02-12 19:47:16 +01:00
LICENSES	LICENSES: Remove CC-BY-SA-4.0 license text	2018-10-18 11:28:50 +02:00
mm	percpu: convert spin_lock_irq to spin_lock_irqsave.	2019-02-12 19:47:12 +01:00
net	xfrm6_tunnel: Fix spi check in __xfrm6_tunnel_alloc_spi	2019-02-12 19:47:13 +01:00
samples	livepatch: check kzalloc return values	2019-02-12 19:47:12 +01:00
scripts	modpost: validate symbol names also in find_elf_symbol	2019-02-12 19:47:01 +01:00
security	smack: fix access permissions for keyring	2019-02-12 19:47:05 +01:00
sound	ASoC: fsl: Fix SND_SOC_EUKREA_TLV320 build error on i.MX8M	2019-02-12 19:47:09 +01:00
tools	perf build: Don't unconditionally link the libbfd feature test to -liberty and -lz	2019-02-12 19:47:16 +01:00
usr	initramfs: move gen_initramfs_list.sh from scripts/ to usr/	2018-08-22 23:21:44 +09:00
virt	kvm: Change offset in kvm_write_guest_offset_cached to unsigned	2019-02-12 19:47:16 +01:00
.clang-format	clang-format: Set IndentWrappedFunctionNames false	2018-08-01 18:38:51 +02:00
.cocciconfig
.get_maintainer.ignore
.gitattributes	.gitattributes: set git diff driver for C source code files	2016-10-07 18:46:30 -07:00
.gitignore	Kbuild updates for v4.17 (2nd)	2018-04-15 17:21:30 -07:00
.mailmap	libnvdimm-for-4.19_misc	2018-08-25 18:13:10 -07:00
COPYING	COPYING: use the new text with points to the license files	2018-03-23 12:41:45 -06:00
CREDITS	9p: remove Ron Minnich from MAINTAINERS	2018-08-17 16:20:26 -07:00
Kbuild	Kbuild updates for v4.15	2017-11-17 17:45:29 -08:00
Kconfig	kconfig: move the "Executable file formats" menu to fs/Kconfig.binfmt	2018-08-02 08:06:55 +09:00
MAINTAINERS	MAINTAINERS: Add Sasha as a stable branch maintainer	2018-12-01 09:37:25 +01:00
Makefile	Linux 4.19.20	2019-02-06 17:30:16 +01:00
README	Docs: Added a pointer to the formatted docs to README	2018-03-21 09:02:53 -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.
See Documentation/00-INDEX for a list of what is contained in each file.

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.