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From: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
To: Simon Kirby <sim@hostway.ca>
Cc: Sergey Senozhatsky <sergey.senozhatsky.work@gmail.com>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Petr Mladek <pmladek@suse.com>,
	Sergey Senozhatsky <sergey.senozhatsky@gmail.com>,
	Steven Rostedt <rostedt@goodmis.org>,
	linux-kernel@vger.kernel.org,
	Lech Perczak <l.perczak@camlintechnologies.com>,
	Theodore Ts'o <tytso@mit.edu>,
	John Ogness <john.ogness@linutronix.de>,
	Jann Horn <jannh@google.com>
Subject: Re: [PATCHv2] printk: queue wake_up_klogd irq_work only if per-CPU areas are ready
Date: Fri, 10 Apr 2020 12:07:04 +0900
Message-ID: <20200410030704.GA20227@jagdpanzerIV.localdomain> (raw)
In-Reply-To: <20200409192543.GA30816@hostway.ca>

On (20/04/09 12:25), Simon Kirby wrote:
> This causes "dmesg -w" or "cat /dev/kmsg" to not print new messages after
> dumping the current ring. I hit this on v5.5.9, v5.5.15, v5.6.3, and
> Linus HEAD. This prints no "hi":
> 
> (sleep 1;echo hi > /dev/kmsg)& dmesg -w
> 
> ...curiously, "strace dmesg -w" shows the data received once ^C is hit.
> 
> Jann pointed me to this patch. Applying it or reverting 1b710b1b10eff9d4
> does fix it for me. However, Linus HEAD is still broken and, AFAICS,
> remains unreverted and unfixed in stable/linux-5.4.y through linux-5.6.y.
> It was introduced in 5.6 but backported to those, not just the LTS above.

I'm trying to land this patch. Give me a moment, I'll come back to
you shortly.

	-ss

  reply index

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-03-03 11:30 Sergey Senozhatsky
2020-03-04 15:21 ` Petr Mladek
2020-03-05  1:30   ` Sergey Senozhatsky
2020-03-05 18:53     ` Greg Kroah-Hartman
2020-04-09 19:25       ` Simon Kirby
2020-04-10  3:07         ` Sergey Senozhatsky [this message]
2020-04-10 23:21           ` Sergey Senozhatsky
2020-04-01 19:34 ` Jann Horn

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