linux-kernel - Re: trace-cmd problem with FC19

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Date:	Thu, 17 Oct 2013 16:20:29 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	"Arend van Spriel" <arend@...adcom.com>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: trace-cmd problem with FC19

On Thu, 17 Oct 2013 22:07:15 +0200
"Arend van Spriel" <arend@...adcom.com> wrote:


> > Does recording other traces work? Or is it only spicific to this module?
> 
> It seems a generic issue:
> 
> $ sudo trace-cmd record -e ext4:* ls
> /sys/kernel/debug/tracing/events/ext4/*/filter
> systemd-private-6pVB5L	systemd-private-KdpFqS	trace.dat.cpu0	trace.dat.cpu2
> systemd-private-9hedRD	trace.dat		trace.dat.cpu1	trace.dat.cpu3
> trace-cmd: Interrupted system call
>    recorder error in splice input
> trace-cmd: Interrupted system call
>    recorder error in splice input
> trace-cmd: Interrupted system call
>    recorder error in splice input
> trace-cmd: Interrupted system call
>    recorder error in splice input
> Kernel buffer statistics:
>    Note: "entries" are the entries left in the kernel ring buffer and 
> are not
>          recorded in the trace data. They should all be zero.
> 
> I got the modules properly signed so only OOT taint is set and it still 
> does not work.

You said this is an issue on Fedora 19?

I have a Fedora 19 VM, and did the following:

$ su
# yum install trace-cmd
# trace-cmd record -e ext4:* ls

and it all worked.

Now the difference is that I don't use sudo (I find it rather silly). 

Do you get the same error with 'su' as you do with 'sudo'?

-- Steve

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