Messages in this thread | | | Date | Mon, 2 Nov 2015 14:27:02 -0800 | Subject | Re: MMC/regulator boot hang in -next | From | John Stultz <> |
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On Mon, Nov 2, 2015 at 2:03 PM, John Stultz <john.stultz@linaro.org> wrote: > On Mon, Nov 2, 2015 at 12:46 PM, Bjorn Andersson > <bjorn.andersson@sonymobile.com> wrote: >> On Mon 02 Nov 11:57 PST 2015, John Stultz wrote: >> >>> Trying to move my nexus7 work to -next, I started seeing boot time >>> hangs. Enabling some debug options provided with a lockdep spew. >>> >>> Reverting "regulator: core: Propagate voltage changes to supply >>> regulators" - fc42112c0eaa avoids the hang, but I still see lockdep >>> noise. >>> >>> Full log of -next based tree without any reverts follows: >> >> It sure does lock like a deadlock to me. Can you figure out which >> regulator we're talking about here? And confirm that this is 8064 we're >> talking about > > So it looks like we're setting the voltage on lvs1, which then calls > get_voltage() on s4. At that point the lockdep spew hits. > > But as Mark noted *this* spew looks like a false positive, but I > suspect lockdep is then disabled and can't detect the real hang > happens shortly afterwards.
Further on this, the lockdep spew happens w/ v4.3 as well. Its just the deadlock in -next got me to add lockdep in my config.
thanks -john
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