On Fri, Dec 12, 2014 at 12:29 AM, Joe Zeff <joe@xxxxxxx> wrote:
On 12/11/2014 06:21 PM, Sam Varshavchik wrote:
We're talking about fedup doing its thing after rebooting into the
upgrade kernel. It appears that the sysrq is enabled in the upgrade
kernel, and I do believe that I accurately explained that sysrq did
produce a response; unfortunately the response did not solve the problem
the sysrq key was intended to solve.
Sysrq key did produce an effect, but not, if memory serves, the effect it's supposed to. Rather similar to a lock-up issue I had before swapping in a new mobo, where it worked reliably when I tested it, but not when I needed it because of hardware trouble. No, I don't think that's what's going on with your system, but the responses you describe just don't sound right. (And, if you're using the Magic Sysrq Key, it's ^Alt-Sysrq that's needed, not just sysrq.)
Only sync is enabled by default on Fedora.
# cat /proc/sys/kernel/sysrq
16
So you have to do:
echo 1 > /proc/sys/kernel/sysrq
Now the other commands will work. I usually just echo the letter to /proc/sysrq-trigger.
Chris Murphy
Chris Murphy
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