On Mon, Jul 09, 2018 at 10:10:34AM +0900, Tetsuo Handa wrote:
> >From 62ddef96020cb397dcbf4b8574f1859b32f983de Mon Sep 17 00:00:00 2001
> From: Tetsuo Handa <penguin-ker...@i-love.sakura.ne.jp>
> Date: Mon, 9 Jul 2018 09:54:01 +0900
> Subject: [PATCH] ANDROID: binder: Latelimit binder_debug().
> 
> syzbot is reporting hung tasks [1] [2]. This might be due to flooding of
> printk() messages from binder subsystem, for NMI backtrace says the CPU
> was busy doing printk() from binder subsystem. Since the kernel log buffer
> is trivially spammed by debug messages, let's latelimit binder_debug().

How is the binder debug messages being turned on?  They are not enabled
by default, is syzbot enabling them?  If so, then I don't know if this
needs to be changed, as you want those debug messages if you ask for
them, you shouldn't ratelimit them.

thanks,

greg k-h
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