[maemo-users] Nightly reboots

From: Kimmo Hämäläinen kimmo.hamalainen at nokia.com
Date: Fri Mar 2 16:26:56 EET 2007
On Fri, 2007-03-02 at 16:07 +0200, ext Eero Tamminen wrote:
> Hi,
> ext Marius Gedminas wrote:
> >> My N800 has been restarting each night sometime after 2am EST (that's
> >> as late as I've been up).  I leave it plugged in either on my night
> >> table or on my desk and when I go to use it in the am, it's clearly
> >> been restarted (bluetooth off, no apps open).
> > 
> > Mine does something similar.  It doesn't reboot *every* night, but it
> > reboots every now and then (roughly a couple of times per week).
> > 
> >> Is there any way to see what's causing this
> > 
> > http://maemo.org/maemowiki/ReportingRebootIssues
> > 
> > My last two spontaneous reboots were attributed to 32_wd (ie. the
> > watchdog).
> > 
> >> to try and prevent it from happening?
> > 
> > I'd love to know.
> > 
> > (Disabling lifeguard resets with the flasher does not count.
> > Besides, I don't think it disables the watchdog.)
> It disables the SW watchdog, but 32_wd is the HW watchdog.
> I've never encountered this reboot.  Had you been doing a lot of disk
> operations (*both* saving and removing large amounts of data from the
> internal Flash) before the night on which the device reboots?
> My suspicion is that sometimes the JFFS2 file system garbage collecting
> might keep the kernel busy for >1/2 minute without yielding the control
> back to scheduler.  Normally the JFFS2 GC happens only on bootup (in
> case you were wondering why the booting is sometimes slower), but
> it can be run also during normal usage. HW watchdog reboots the
> device if it's not refreshed within 1/2 min (in the JFFS2 case the
> device would probably unfreeze / function normally after GC has
> finished).

My guess is the WLAN. IIRC, there was rebooting problems that were
caused by just leaving the WLAN connection idle. Fortunately, the next
SW release should fix those.

BR; Kimmo

> 	- Eero
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