From: "Theodore Y. Ts'o" <tytso@mit.edu>
To: Mikulas Patocka <mpatocka@redhat.com>
Cc: Petr Mladek <pmladek@suse.com>, Nigel Croxon <ncroxon@redhat.com>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Steven Rostedt <rostedt@goodmis.org>,
Sergey Senozhatsky <sergey.senozhatsky@gmail.com>,
dm-devel@redhat.com, linux-serial@vger.kernel.org
Subject: Re: Serial console is causing system lock-up
Date: Wed, 6 Mar 2019 11:30:04 -0500 [thread overview]
Message-ID: <20190306163003.GA31858@mit.edu> (raw)
In-Reply-To: <alpine.LRH.2.02.1903061031420.16905@file01.intranet.prod.int.rdu2.redhat.com>
On Wed, Mar 06, 2019 at 11:07:55AM -0500, Mikulas Patocka wrote:
> This bug only happens if we select large logbuffer (millions of
> characters). With smaller log buffer, there are messages "** X printk
> messages dropped", but there's no lockup.
>
> The kernel apparently puts 2 million characters into a console log buffer,
> then takes some lock and than tries to write all of them to a slow serial
> line.
What are the messages; from what kernel subsystem? Why are you seeing
so many log messages?
- Ted
next prev parent reply other threads:[~2019-03-06 16:30 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-03-06 14:27 Serial console is causing system lock-up Mikulas Patocka
2019-03-06 15:22 ` Petr Mladek
2019-03-06 16:07 ` Mikulas Patocka
2019-03-06 16:30 ` Theodore Y. Ts'o [this message]
2019-03-06 17:11 ` Mikulas Patocka
2019-03-06 22:19 ` Steven Rostedt
2019-03-06 22:43 ` John Ogness
2019-03-07 2:22 ` Sergey Senozhatsky
2019-03-07 8:17 ` John Ogness
2019-03-07 8:25 ` Sergey Senozhatsky
2019-03-07 8:34 ` John Ogness
2019-03-07 9:17 ` Sergey Senozhatsky
2019-03-07 10:37 ` John Ogness
2019-03-07 12:26 ` Sergey Senozhatsky
2019-03-07 12:54 ` Mikulas Patocka
2019-03-07 14:21 ` John Ogness
2019-03-07 15:35 ` Petr Mladek
2019-03-12 2:32 ` Sergey Senozhatsky
2019-03-12 8:17 ` John Ogness
2019-03-12 8:59 ` Sergey Senozhatsky
2019-03-12 10:05 ` Mikulas Patocka
2019-03-12 13:19 ` John Ogness
2019-03-12 13:44 ` Petr Mladek
2019-03-12 12:08 ` Petr Mladek
2019-03-12 15:19 ` John Ogness
2019-03-13 2:38 ` Sergey Senozhatsky
2019-03-13 8:43 ` John Ogness
2019-03-14 10:30 ` Sergey Senozhatsky
2019-03-07 14:08 ` John Stoffel
2019-03-07 14:26 ` Mikulas Patocka
2019-03-08 1:22 ` Sergey Senozhatsky
2019-03-08 1:39 ` Sergey Senozhatsky
2019-03-08 2:36 ` John Ogness
2019-03-07 15:16 ` Petr Mladek
2019-03-07 1:56 ` Sergey Senozhatsky
2019-03-07 13:12 ` Mikulas Patocka
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