linux-kernel - Re: [Bug 199003] console stalled, cause Hard LOCKUP.

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Date:   Mon, 26 Mar 2018 14:18:45 +0900
From:   Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>
To:     bugzilla-daemon@...zilla.kernel.org
Cc:     Steven Rostedt <rostedt@...dmis.org>,
        Petr Mladek <pmladek@...e.com>,
        Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>,
        bugzilla-daemon@...zilla.kernel.org,
        LKML <linux-kernel@...r.kernel.org>, wen.yang99@....com.cn,
        Peter Zijlstra <peterz@...radead.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Christoph Hellwig <hch@...radead.org>
Subject: Re: [Bug 199003] console stalled, cause Hard LOCKUP.

Cc-ing the kernel list and printk people.

Wen Yang, any chance we can switch to email? Bugzilla is not very handful.


On (03/26/18 02:40), bugzilla-daemon@...zilla.kernel.org wrote:
> https://bugzilla.kernel.org/show_bug.cgi?id=199003
> 
> --- Comment #11 from Wen Yang (wen.yang99@....com.cn) ---
> Hello Steven,
> 
> +module_param_named(synchronous, printk_sync, bool, S_IRUGO);
> +MODULE_PARM_DESC(synchronous, "make printing to console synchronous");
> 
> It's depend on this kernel parameter(printk.synchronous), but this parameter is
> readonly.
> So we must change grub files, and alse need to restart the server for changes
> to take effect.
> If we can configure it dynamically, it will be more useful.

So you are testing printk_kthread now, right? May I ask why?
Did Steven's patch help?

	-ss