Ticket #9743 (closed defect: worksforme)

Opened 5 years ago

Last modified 4 years ago

XO-1.5 unexpected reboot within OFW associated with autowack resume testing

Reported by: wad Owned by: wad
Priority: high Milestone: 1.5-hardware-C
Component: hardware Version: 1.5-B3
Keywords: Cc: rsmith
Action Needed: reproduce Verified: no
Deployments affected: Blocked By:
Blocking:

Description

On an XO-1.5 B3 prototype (#17), running Q3A16 and os45, I had a reboot instead of a resume.

The laptop was modified with the XO1.5 WLAN SR ECO:

http://wiki.laptop.org/go/XO1.5_WLAN_SR_ECO

The laptop was set to autowack by adding:

50 autowack-delay

autowack-on

to the olpc.fth file.

It was associated with an access point.

From the terminal activity, I enabled EC wakeup events using:

sudo sh

echo EC > /proc/acpi/wakeup

I then started a script running:

for i in seq 1 100000; do echo $i; sleep 1; echo mem > /sys/power/state; done;

On the first resume, it did the +r+r+X+Forthmacs rumba.

I have seen this once before, on a laptop without the XO1.5 WLAN SR ECO. At that time, I attributed it to MPPT experiments ongoing with that motherboard. The symptoms, however, are identical and this motherboard has no modifications to enable MPPT.

Attachments

crash_log2 (20.7 kB) - added by wad 5 years ago.
serial output of the crash. Sorry, but extra kernel debugging was intentionally turned off

Change History

Changed 5 years ago by wad

serial output of the crash. Sorry, but extra kernel debugging was intentionally turned off

Changed 5 years ago by pgf

cjb -- did you say that ftrace can be used somehow to help with spontaneous reboots like this? if so, can you write up a small HOWTO? i think i may have seen this as well, not too long ago. for a sporadic bug like this, it would be worth setting up whatever tools we've got ahead of time.

Changed 5 years ago by cjb

No, Paul, I don't see how for this bug. The reboot happens inside OFW code, not Linux code -- there's not much to trace. Can write up a HOWTO tomorrow all the same, though..

Changed 4 years ago by Quozl

  • summary changed from Reboot instead of resume on XO-1.5 to XO-1.5 unexpected reboot within OFW associated with autowack resume testing

Changed 4 years ago by cjb

  • status changed from new to closed
  • resolution set to worksforme

I'm going to close this as not reproduceable on current hardware -- yell if you think that's incorrect.

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