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yangerkun 2cc2e56d90 ext4: refresh the ext4_ext_path struct after dropping i_data_sem. 
commit 1811bc401a upstream.

After we drop i_data sem, we need to reload the ext4_ext_path
structure since the extent tree can change once i_data_sem is
released.

This addresses the BUG:

[52117.465187] ------------[ cut here ]------------
[52117.465686] kernel BUG at fs/ext4/extents.c:1756!
...
[52117.478306] Call Trace:
[52117.478565]  ext4_ext_shift_extents+0x3ee/0x710
[52117.479020]  ext4_fallocate+0x139c/0x1b40
[52117.479405]  ? __do_sys_newfstat+0x6b/0x80
[52117.479805]  vfs_fallocate+0x151/0x4b0
[52117.480177]  ksys_fallocate+0x4a/0xa0
[52117.480533]  __x64_sys_fallocate+0x22/0x30
[52117.480930]  do_syscall_64+0x35/0x80
[52117.481277]  entry_SYSCALL_64_after_hwframe+0x44/0xae
[52117.481769] RIP: 0033:0x7fa062f855ca

Cc: stable@kernel.org
Link: https://lore.kernel.org/r/20210903062748.4118886-4-yangerkun@huawei.com
Signed-off-by: yangerkun <yangerkun@huawei.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2021-11-18 19:15:56 +01:00
arch parisc: Fix ptrace check on syscall return 2021-11-18 19:15:53 +01:00
block block-5.15-2021-10-29 2021-10-29 11:10:29 -07:00
certs certs: Add support for using elliptic curve keys for signing modules 2021-08-23 19:55:42 +03:00
crypto Merge branch 'linus' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6 2021-08-30 12:57:10 -07:00
Documentation kfence: default to dynamic branch instead of static keys mode 2021-11-12 15:05:49 +01:00
drivers media: v4l2-ioctl: Fix check_ext_ctrls 2021-11-18 19:15:53 +01:00
fs ext4: refresh the ext4_ext_path struct after dropping i_data_sem. 2021-11-18 19:15:56 +01:00
include scsi: core: Avoid leaving shost->last_reset with stale value if EH does not run 2021-11-18 19:15:51 +01:00
init bootconfig: init: Fix memblock leak in xbc_make_cmdline() 2021-10-10 22:27:40 -04:00
ipc ipc: remove memcg accounting for sops objects in do_semtimedop() 2021-09-14 10:22:11 -07:00
kernel Tracing comment fixes: 2021-10-29 10:41:07 -07:00
lib kfence: default to dynamic branch instead of static keys mode 2021-11-12 15:05:49 +01:00
LICENSES LICENSES/dual/CC-BY-4.0: Git rid of "smart quotes" 2021-07-15 06:31:24 -06:00
mm kfence: always use static branches to guard kfence_alloc() 2021-11-12 15:05:49 +01:00
net mptcp: fix corrupt receiver key in MPC + data + checksum 2021-10-28 08:19:06 -07:00
samples samples/bpf: Relicense bpf_insn.h as GPL-2.0-only OR BSD-2-Clause 2021-09-29 16:03:55 +02:00
scripts Tracing fixes for 5.15: 2021-10-16 10:51:41 -07:00
security binder: use cred instead of task for selinux checks 2021-11-12 15:05:48 +01:00
sound ALSA: timer: Unconditionally unlink slave instances, too 2021-11-18 19:15:55 +01:00
tools perf script: Fix PERF_SAMPLE_WEIGHT_STRUCT support 2021-10-31 12:51:41 -03:00
usr .gitignore: prefix local generated files with a slash 2021-05-02 00:43:35 +09:00
virt KVM: Remove tlbs_dirty 2021-09-23 11:01:12 -04:00
.clang-format clang-format: Update with the latest for_each macro list 2021-05-12 23:32:39 +02:00
.cocciconfig
.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 drm fixes for 5.15 final 2021-10-28 12:17:01 -07:00
Makefile Linux 5.15.2 2021-11-12 15:05:52 +01:00
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.