linux-kernel - Re: Tracing to console

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Date:   Tue, 26 Jun 2018 08:42:06 -0700
From:   Bart Van Assche <bart.vanassche@....com>
To:     "rostedt@...dmis.org" <rostedt@...dmis.org>
Cc:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "mingo@...hat.com" <mingo@...hat.com>
Subject: Re: Tracing to console

Hello Steven and Ingo,

Did I report this observation to the right people?

Thank you,

Bart.

On 06/15/18 14:01, Bart Van Assche wrote:
> Hello Steven,
> 
> If I run the following commands as root:
> 
> cd /sys/kernel/debug/tracing
> grep pm_ available_events > set_event
> echo function >current_tracer
> grep scsi_ available_filter_functions | while read a b; do echo $a; done >set_ftrace_filter
> echo 1 >events/printk/enable
> echo 1 >tracing_on
> echo 1 >/proc/sys/kernel/tracepoint_printk
> echo - - - >/sys/class/scsi_host/host0/scan
> 
> then the following appears on the console:
> 
> console: ata1: SATA link up 1.5 Gbps (SStatus 113 SControl 300)
> console: console: ata1: SATA link up 1.5 Gbps (SStatus 113 SControl 300)
> console: console: console: ata1: SATA link up 1.5 Gbps (SStatus 113 SControl 300)
> console: console: console: console: ata1: SATA link up 1.5 Gbps (SStatus 113 SControl 300)
> console: console: console: console: console: ata1: SATA link up 1.5 Gbps (SStatus 113 SControl 300)
> console: console: console: console: console: console: ata1: SATA link up 1.5 Gbps (SStatus 113 SControl 300)
> console: console: console: console: console: console: console: ata1: SATA link up 1.5 Gbps (SStatus 113 SControl 300)
> console: console: console: console: console: console: console: console: ata1: SATA link up 1.5 Gbps (SStatus 113 SControl 300)
> console: console: console: console: console: console: console: console: console: ata1: SATA link up 1.5 Gbps (SStatus 113 SControl 300)
> console: console: console: console: console: console: console: console: console: console: ata1: SATA link up 1.5 Gbps (SStatus 113 SControl 300)
> console: console: console: console: console: console: console: console: console: console: console: ata1: SATA link up 1.5 Gbps (SStatus 113 SControl 300)
> [ ... ]
> 
> I assume that the repeated "console: " prefix is a bug and also that the same
> line repeats over and over again is also a bug? I ran into this with commit
> 017b3f8a10ca ("scsi: snic: fix a couple of spelling mistakes: "COMPLETE"").