Re: [Xen-devel] boot message "xen:manage: Unable to read sysrq code in control/sysrq" ?

[Juergen Gross <jgross@xxxxxxxx>]

On 28/05/17 21:55, PGNet Dev wrote:
> Working with Xen 4.9.0 host on kernel 4.11.3
> 
>       dmesg | egrep -i "linux version|xen version"
>               [    0.000000] Linux version 4.11.3-2.g7262353-default 
> (geeko@buildhost) (gcc version 7.1.1 20170517 [gcc-7-branch revision 248152] 
> (SUSE Linux) ) #1 SMP PREEMPT Thu May 25 17:55:04 UTC 2017 (7262353)
>               [    0.000000] Xen version: 4.9.0_07-503 (preserve-AD)
> 
> I currently see in host boot
> 
>       dmesg | grep sysrq
>               [   20.905146] xen:manage: Unable to read sysrq code in 
> control/sysrq
> 
> That seems to originate at
> 
>       https://lkml.org/lkml/2016/11/8/134
>               ...
>       +       if (xenbus_scanf(xbt, "control", "sysrq", "%c", &sysrq_key) < 
> 0) {
>                       pr_err("Unable to read sysrq code in control/sysrq\n");
>                       xenbus_transaction_end(xbt, 1);
>                       return;
>               ...
> 
> Is this a config issue -- wrong or missing -- on my end?  Or a problem that 
> needs some more diagnostic info here?

Its just a message which shouldn't be printed at all, as this is no
error. I'll send a patch.

Thanks for the notice!


Juergen

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