linux-kernel - Re: printk() + memory offline deadlock (WAS Re: page_alloc.shuffle=1 + CONFIG_PROVE

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Message-ID: <20190918155823.GB158834@tigerII.localdomain>
Date:   Thu, 19 Sep 2019 00:58:23 +0900
From:   Sergey Senozhatsky <sergey.senozhatsky@...il.com>
To:     Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>
Cc:     Qian Cai <cai@....pw>, Steven Rostedt <rostedt@...dmis.org>,
        Petr Mladek <pmladek@...e.com>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Dan Williams <dan.j.williams@...el.com>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        Peter Zijlstra <peterz@...radead.org>,
        Waiman Long <longman@...hat.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Theodore Ts'o <tytso@....edu>, Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: Re: printk() + memory offline deadlock (WAS Re: page_alloc.shuffle=1
 + CONFIG_PROVE_LOCKING=y = arm64 hang)

A correction:

On (09/19/19 00:51), Sergey Senozhatsky wrote:
[..]
>
> zone->lock --> console_sem->lock
> 
> So then we have
> 
> 	zone->lock --> console_sem->lock --> pi_lock --> rq->lock
> 
>   vs. the reverse chain
> 
> 	rq->lock --> console_sem->lock

                     ^^^ zone->lock

	-ss