how do I find out what's hanging me up?

[Mark Peveto]

I've been working on this more today, pulling out all the tools I've got.  To the point i'm using tap tap see to try and get an idea of what's on my screen when reboot hangs.  The most i can
get  is a message about bus socket display, and a command prompt.
Not real helpful, but I guess it's a start.

Mark Peveto
Registered Linux user number 600552
Sent from sonar using alpine 2.20.13


On Sat, 2 Jul 2016, Tony Baechler wrote:

> On 7/2/2016 1:54 AM, Mark Peveto wrote:
> > The short version of a long story.  I've just installed sonar on a dell pc.
> > I've also got it installed on a compaq/hp machine, where the followig
> > problem doesn't exist.  On the dell, sudo reboot seems to hang.  Sudo
> > shutdown works fine.  I've tried sudo shutdown -r now, sudo systemctl
> > reboot, and
> > other options.  How, without sighted help, can I find out what's causing
> > this machine to hang when I reboot.  What's strange is this...why does it
> > shut
> > down just fine, but not reboot?
>
> I'm not familiar with Sonar, so consider these random guesses. First, have you
> looked in /var/log/syslog and kern.log? There might be a process not shutting
> down properly. If you halt the system, all processes are killed and all
> filesystems are unmounted. A reboot only resets the system, so I suppose it's
> possible that a process is behaving badly or the kernel can't unmount a
> filesystem. I see this sometimes with slow USB devices, like if I copy a ton
> of files to my SD card. A more likely explanation is an ACPI or power
> management issue. You didn't say how old the machines are, but it could be a
> BIOS bug. Recent kernels should work around this. Without knowing the age of
> the machine and the kernel version, I can only guess.
>
> Also, the machine isn't a laptop, right? Laptops usually have power management
> issues. On Debian, there is a package called acpi-tools. Try installing it if
> it isn't there or purging it if it's there. I have better luck without it
> installed. I would bet syslog and kern.log would have clues to your problem. I
> would check those first. Make note of the time you reboot the machine and look
> at those files with less. You could try booting a live CD to avoid adding all
> of the boot messages to the logs. You didn't say if that happens on a live CD,
> booting from the hard drive, other distros, etc. I''ve noticed most live CDs
> have strange shutdown problems. You might have to pass a parameter on the
> kernel command line. Both HP and Dell have issues with Linux.
>
> --
> Tony Baechler, founder, Baechler Access Technology Services
> Putting accessibility at the forefront of technology
> mailto:bats at batsupport.com
> Phone: 1-619-746-8310  SMS text: 1-619-375-2545
>
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