linux-kernel - Re: [PATCHv7 6/8] printk: use printk

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Message-ID: <20170201093739.GT6515@twins.programming.kicks-ass.net>
Date:   Wed, 1 Feb 2017 10:37:39 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Jan Kara <jack@...e.cz>
Cc:     Ross Zwisler <zwisler@...il.com>,
        Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
        Ross Zwisler <ross.zwisler@...ux.intel.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Petr Mladek <pmladek@...e.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Tejun Heo <tj@...nel.org>, Calvin Owens <calvinowens@...com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Ingo Molnar <mingo@...hat.com>,
        Andy Lutomirski <luto@...nel.org>,
        Peter Hurley <peter@...leysoftware.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>
Subject: Re: [PATCHv7 6/8] printk: use printk_safe buffers in printk

On Wed, Feb 01, 2017 at 10:06:25AM +0100, Jan Kara wrote:
> Clearly scheduler code (update_load_avg) calls WARN_ON from scheduler while
> holding rq_lock which has been always forbidden. Sergey and Petr were doing
> some work to prevent similar deadlocks but I'm not sure how far they
> went...

Its not forbidden, just can result in the occasional deadlock, meh.


In any case, there's a patch in tip fixing that warn trigger.