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Date:	Fri, 16 May 2014 01:50:01 +0000
From:	bugzilla-daemon@...zilla.kernel.org
To:	linux-ext4@...r.kernel.org
Subject: [Bug 76261] ext4_da_writepages err -30 after remount ro during
 shutdown

https://bugzilla.kernel.org/show_bug.cgi?id=76261

--- Comment #2 from kun.chen <kun.chen@...iatek.com> ---
You can refer this:
https://android.googlesource.com/platform/system/core/+/master/libcutils/android_reboot.c
During shutdown in android, it realy will goto emergency_remount() flow. 

And from the ksmg log, it seems ext4 writeback continued almost 15 seconds
after emergency_remount() completed. Not sure why still has so many writeback
occurs, even it used emergency_remount(), still has so many writeback occurs,
and takes so long time, this will lead to shutdown hang or delay

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