On 03/29/2016 07:34 PM, Guoqing Jiang wrote:
On 03/30/2016 05:37 AM, Shaohua Li wrote:
On Tue, Mar 29, 2016 at 08:22:00AM -0400, Xiao Ni wrote:
Hi all
I encountered one NULL pointer dereference problem.
The environment：
latest linux-stable and mdadm codes
aarch64 platform
the md device is created with loop devices
It's a test case to check date integrity. I added the test script as
the attachment.
Could you please try this patch:
From b86d9e1724184c79ad1ea63901aec802492b861c Mon Sep 17 00:00:00 2001
Message-Id:
<b86d9e1724184c79ad1ea63901aec802492b861c.1459285706.git.shli@xxxxxx>
From: Shaohua Li <shli@xxxxxx>
Date: Tue, 29 Mar 2016 14:00:19 -0700
Subject: [PATCH] MD: add rdev reference for super write
md_super_write() and corresponding md_super_wait() generally are called
with reconfig_mutex locked, which prevents disk disappears.
Just for curious, I find several paths maybe also don't hold
reconfig_mutex,
take the followings as example.
1. md_run -> md_update_sb -> md_super_write/md_super_wait
2. rdev_size_store -> rdev_size_change -> md_super_write/md_super_wait
we do mddev_lock/unlock calling these. The rdev_size_sotre is a bit
tricky. the lock is hold in rdev_attr_store
Thanks,
Shaohua
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