linux-kernel - Re: [PATCH 0/2] printk: replace ringbuffer

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Date:   Thu, 6 Feb 2020 20:40:12 -0500
From:   Steven Rostedt <rostedt@...dmis.org>
To:     John Ogness <john.ogness@...utronix.de>
Cc:     Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
        Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>,
        lijiang <lijiang@...hat.com>, Petr Mladek <pmladek@...e.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Andrea Parri <parri.andrea@...il.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        kexec@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/2] printk: replace ringbuffer

On Wed, 05 Feb 2020 16:48:32 +0100
John Ogness <john.ogness@...utronix.de> wrote:

> The quick fixup:
> 
> diff --git a/kernel/printk/printk.c b/kernel/printk/printk.c
> index d0d24ee1d1f4..5ad67ff60cd9 100644
> --- a/kernel/printk/printk.c
> +++ b/kernel/printk/printk.c
> @@ -883,6 +883,7 @@ static int devkmsg_open(struct inode *inode, struct file *file)
>  	user->record.text_buf_size = sizeof(user->text_buf);
>  	user->record.dict_buf = &user->dict_buf[0];
>  	user->record.dict_buf_size = sizeof(user->dict_buf);
> +	user->record.text_line_count = NULL;
>  
>  	logbuf_lock_irq();
>  	user->seq = prb_first_seq(prb);

FYI, I used your patch set to test out Konstantin's new get-lore-mbox
script, and then applied them. It locked up on boot up as well, and
applying this appears to fix it.

-- Steve