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Guoqing Jiang a377a472b9 raid5: call clear_batch_ready before set STRIPE_ACTIVE 
We tried to only put the head sh of batch list to handle_list, then the
handle_stripe doesn't handle other members in the batch list. However,
we still got the calltrace in break_stripe_batch_list.

[593764.644269] stripe state: 2003
kernel: [593764.644299] ------------[ cut here ]------------
kernel: [593764.644308] WARNING: CPU: 12 PID: 856 at drivers/md/raid5.c:4625 break_stripe_batch_list+0x203/0x240 [raid456]
[...]
kernel: [593764.644363] Call Trace:
kernel: [593764.644370]  handle_stripe+0x907/0x20c0 [raid456]
kernel: [593764.644376]  ? __wake_up_common_lock+0x89/0xc0
kernel: [593764.644379]  handle_active_stripes.isra.57+0x35f/0x570 [raid456]
kernel: [593764.644382]  ? raid5_wakeup_stripe_thread+0x96/0x1f0 [raid456]
kernel: [593764.644385]  raid5d+0x480/0x6a0 [raid456]
kernel: [593764.644390]  ? md_thread+0x11f/0x160
kernel: [593764.644392]  md_thread+0x11f/0x160
kernel: [593764.644394]  ? wait_woken+0x80/0x80
kernel: [593764.644396]  kthread+0xfc/0x130
kernel: [593764.644398]  ? find_pers+0x70/0x70
kernel: [593764.644399]  ? kthread_create_on_node+0x70/0x70
kernel: [593764.644401]  ret_from_fork+0x1f/0x30

As we can see, the stripe was set with STRIPE_ACTIVE and STRIPE_HANDLE,
and only handle_stripe could set those flags then return. And since the
stipe was already in the batch list, we need to return earlier before
set the two flags.

And after dig a little about git history especially commit 3664847d95
("md/raid5: fix a race condition in stripe batch"), it seems the batched
stipe still could be handled by handle_stipe, then handle_stipe needs to
return earlier if clear_batch_ready to return true.

Signed-off-by: Guoqing Jiang <guoqing.jiang@cloud.ionos.com>
Signed-off-by: Song Liu <songliubraving@fb.com>
History 2020-07-16 10:12:18 -07:00
arch Linux 5.8-rc4 2020-07-08 08:02:13 -06:00
block block: add max_active_zones to blk-sysfs 2020-07-15 14:26:11 -06:00
certs .gitignore: add SPDX License Identifier 2020-03-25 11:50:48 +01:00
crypto crypto: af_alg - fix use-after-free in af_alg_accept() due to bh_lock_sock() 2020-06-18 17:09:54 +10:00
Documentation block: add max_active_zones to blk-sysfs 2020-07-15 14:26:11 -06:00
drivers raid5: call clear_batch_ready before set STRIPE_ACTIVE 2020-07-16 10:12:18 -07:00
fs Linux 5.8-rc4 2020-07-08 08:02:13 -06:00
include block: add max_active_zones to blk-sysfs 2020-07-15 14:26:11 -06:00
init kbuild: fix CONFIG_CC_CAN_LINK(_STATIC) for cross-compilation with Clang 2020-07-02 00:57:45 +09:00
ipc mmap locking API: use coccinelle to convert mmap_sem rwsem call sites 2020-06-09 09:39:14 -07:00
kernel Linux 5.8-rc4 2020-07-08 08:02:13 -06:00
lib Linux 5.8-rc4 2020-07-08 08:02:13 -06:00
LICENSES LICENSES: Rename other to deprecated 2019-05-03 06:34:32 -06:00
mm Linux 5.8-rc4 2020-07-08 08:02:13 -06:00
net Fixes for a umask bug on exported filesystems lacking ACL support, a 2020-07-02 20:35:33 -07:00
samples samples/vfs: avoid warning in statx override 2020-07-03 16:15:25 -07:00
scripts Kbuild fixes for v5.8 (2nd) 2020-07-05 12:14:24 -07:00
security Linux 5.8-rc4 2020-07-08 08:02:13 -06:00
sound sound fixes for 5.8-rc3 2020-06-25 09:15:24 -07:00
tools A series of fixes for x86: 2020-07-05 12:23:49 -07:00
usr bpfilter: match bit size of bpfilter_umh to that of the kernel 2020-05-17 18:52:01 +09:00
virt MIPS: 2020-06-12 11:05:52 -07:00
.clang-format block: add bio_for_each_bvec_all() 2020-05-25 11:25:24 +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: Do not track defconfig from make savedefconfig 2020-07-05 16:15:46 +09:00
.mailmap A fair amount of stuff this time around, dominated by yet another massive 2020-06-01 15:45:27 -07:00
COPYING COPYING: state that all contributions really are covered by this file 2020-02-10 13:32:20 -08:00
CREDITS mailmap: change email for Ricardo Ribalda 2020-05-25 18:59:59 -06:00
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 Devicetree fixes for v5.8, take 2: 2020-07-02 22:46:05 -07:00
Makefile Linux 5.8-rc4 2020-07-05 16:20:22 -07:00
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.