Messages in this thread | | | Date | Fri, 22 Aug 2008 11:18:27 +0200 | From | Pavel Machek <> | Subject | Re: latest -git: hibernate: possible circular locking dependency detected |
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Hi!
> > this path is triggered as a result of "echo disk > /sys/power/state" > > Yes. That is what I typed. > > > > > disable_nonboot_cpus() calls cpu_maps_update_being() which takes > > "cpu_add_remove_lock" (lock-1). > > > > If we go down the road cleanup_workqueue_thread() -> > > flush_cpu_workqueue() will take "cwq->lock" (lock-2). > > So this should be the second lock. > > > > > [...] > > > hmm, did you somehow hit "Sysrq + o"? > > > > 'cause I don't see any other places (say, with handle_sysrq(k,...) > > where "k" migth be 'o') from where do_power_off() might have been > > triggered... > > > > No. But in my logs I often saw SysRq triggered, even though I didn't > do it any of these times: > > log-20080821-104053.txt:SysRq : SysRq : Show State > log-20080821-105541.txt:SysRq : Emergency Sync > log-20080821-105541.txt:SysRq : Emergency Sync > log-20080821-105541.txt:SysRq : Power Off > log-20080821-110514.txt:SysRq : Terminate All Tasks > log-20080821-111650.txt:SysRq : HELP : loglevel0-8 <6>serial 00:0d: activated > log-20080821-111650.txt:SysRq : Power Off > log-20080821-111650.txt:SysRq : Terminate All Tasks > log-20080821-111650.txt:SysRq : SysRq : <6>serial 00:0d: activated > log-20080821-120628.txt:SysRq : SysRq : HELP : HELP : <6>serial 00:0d: activated > log-20080821-120628.txt:SysRq : SysRq : HELP : HELP : <6>serial 00:0d: activated > > (And it seems to pick a random letter too. It even showed the "HELP:" > line at one point!) > > I have no idea why this happens. Is it possible to trigger SysRq by > writing data on the other end of the serial console? (Maybe my cable > is bad or something, but data seems to be going in both directions > over my serial console.)
Serial break translates to sysrq, IIRC.
-- (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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