Re: system hangs due to qgroups

[Marc Joliet <marcec@gmx.de>]

[-- Attachment #1: Type: text/plain, Size: 1570 bytes --]

On Sunday 04 December 2016 03:10:19 Adam Borowski wrote:
> On Sat, Dec 03, 2016 at 10:46:40PM +0100, Marc Joliet wrote:
> > As it's a rescue shell, I have only the one shell AFAIK, and it's occupied
> > by mount.  So I can't tell if there are dmesg entries, however, when this
> > happens during a normal running system, I never saw any dmesg entries.
> 
> You can use "open" (might be named "openvt") to spawn a shell on
> tty2/tty3/etc.  And if you have "screen" installed, Ctrl-a c spawns new
> terminals (Ctrl-a n/p/0-9 to switch).

I was actually considering adding tmux to the list of programs in the 
initramfs after this experience :) .

> > The output of sysrq+t is too big to capture all of it (i.e., I can't
> > scroll
> > back to the beginning)
> 
> You may use netconsole to log everything kernel says to another machine.  I
> can't provide you with the incantations from the top of my head (got working
> serial (far more reliable) on all my dev boxes, and it doesn't work with
> bridging ie containers on production), but as your rescue shell has no
> network sharing, assuming your network card driver supports a feature
> netconsole needs _and_ stars were aligned right when your network card was
> manufactured, netconsole is a valuable aid.
> 
> The system might be not dead enough to stop userland network logging from
> getting through, too.

OK, I'll look up netconsole.

> Meow!

Thanks
-- 
Marc Joliet
--
"People who think they know everything really annoy those of us who know we
don't" - Bjarne Stroustrup

[-- Attachment #2: This is a digitally signed message part. --]
[-- Type: application/pgp-signature, Size: 801 bytes --]