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Date: Thu, 10 Jan 2013 15:02:51 +0100 From: Adrian Byszuk <adrian.byszuk@...il.com> To: Borislav Petkov <bp@...en8.de>, linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>, John Stultz <john.stultz@...aro.org> Subject: Re: BUG: kernel panic on Dell Vostro 3560 when plugging in AC adapter On 10/01/13 12:35, Borislav Petkov wrote: > On Thu, Jan 10, 2013 at 11:59:48AM +0100, Adrian Byszuk wrote: >> I think I won't get the answer this way. Bisecting between >> 3.7 and 3.8-rc2 (from linus tree) led me to commit >> 63e1ed2364050073770c085021377d7764969b85 titled "Update vt8500 PWM >> driver support", which I think is rather nonsense. Also, depending on >> bisected version, sometimes I got kernel panic, but sometimes (more >> often) whole system would just freeze completely. >> >> Any other way diagnose this bug? > > Hmm, bisection can sometimes lead us in the fields, nasty. > > Well, you could try bisecting the major releases in between. I.e., test > 3.8-rc1, and then test vanilla 3.7. > > For example, if you still trigger it with -rc1, then no need to bisect > the -rc2..-rc1 range. If you still trigger it with 3.7 then not good - > in that case you'd need to go further back in time. > > The best would be if you don't trigger it with 3.7 but trigger it with > 3.7.1 :) Then it is easy. Life isn't easy :-) with 3.7 I can trigger it too, but I can't trigger it with 3.8-rc1, so the fix lies somewhere between 3.7.1..3.8-rc1. I'll try bisecting it again. > > Also, git bisect skip can skip ranges of commits. You could try that too > but you need to visialize how exactly the tree structure is and I admit, > I haven't figured out the details of that yet but Linus has explained > this approach a couple of times, you might want to take a look at this > http://www.yarchive.net/comp/linux/git_bisect.html or search the net for > even better ideas. > > Also, you said "with 3.8.0-rc2 it looks like it's working correctly - > I've tried the unplug/plug sequence more than 5 times and it seems to > work fine." > > Please test that again and repeat that sequence say 15-20 times, to > make sure that -rc2 is really ok and not something changed timing and > this bug is being only brown-paper-baggy-covered now. I mean, I'm just > guessing - you're in front of the machine, you know best what to do to > trigger the bug reliably. > > HTH. > -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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