Re: Kernel panic on Lenovo X60 with tracing enabled
From: Paul Menzel
Date: Fri Mar 10 2017 - 03:53:41 EST
Dear Josh,
On 03/10/17 00:04, Josh Poimboeuf wrote:
On Thu, Mar 09, 2017 at 09:43:47PM +0100, Paul Menzel wrote:
On 2017-03-09 17:29, Steven Rostedt wrote:
On Thu, 9 Mar 2017 10:16:02 -0600 Josh Poimboeuf wrote:
On Thu, Mar 09, 2017 at 09:36:30AM -0500, Steven Rostedt wrote:
On Thu, 9 Mar 2017 13:12:28 +0100 Paul Menzel wrote:
Hopefully, I am contacting the right people for my issue.
Suspending a system with Linux 4.9.13 with tracing enabled, it fails
with the screen still enabled, and the LED blinking. Attaching a serial
console to the dock, shows the messages below.
I'm betting this is a compiler bug, as that bug that printed is the
internal ftrace check for it. (note the bug is only in x86-32 not
x86-64)
Funny, we are just talking about this bug in another thread, but with a
different symptom.
Josh, did you say this goes away if you disable optimize for size or
does it need to be enabled?
Yeah, assuming it's the same problem, then this is caused by
CONFIG_CC_OPTIMIZE_FOR_SIZE. It would be fixed by changing it to
CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE.
Paul, do you have CONFIG_CC_OPTIMIZE_FOR_SIZE enabled? Can you set it
to PERFORMANCE and see if the problem goes away?
As far as I can see, the Debian Linux kernel is built with
`CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE=y`.
So it might be a different problem?
Is it a stock Debian kernel? If so, do you have a link where it can be
downloaded?
Sure, hopefully [3] works for you.
```
dpkg -x
linux-image-4.9.0-0.bpo.2-686-pae-unsigned_4.9.13-1~bpo8+1_i386.deb
target-directory
```
Kind regards,
Paul
[1]
https://packages.debian.org/jessie-backports/linux-image-4.9.0-0.bpo.2-686-pae-unsigned
[2]
https://packages.debian.org/jessie-backports/i386/linux-image-4.9.0-0.bpo.2-686-pae-unsigned/download
[3]
http://ftp.us.debian.org/debian/pool/main/l/linux/linux-image-4.9.0-0.bpo.2-686-pae-unsigned_4.9.13-1~bpo8+1_i386.deb
[4] https://linux.die.net/man/1/dpkg