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From: Alan Stern <stern@rowland.harvard.edu>
To: Pavel Machek <pavel@ucw.cz>
Cc: torvalds@linux-foundation.org,
	kernel list <linux-kernel@vger.kernel.org>,
	<linux-usb@vger.kernel.org>, <gregkh@linuxfoundation.org>,
	<bhelgaas@google.com>, <linux-pci@vger.kernel.org>
Subject: Re: v4.10-rc8 (-rc6) boot regression on Intel desktop, does not boot after cold boots, boots after reboot
Date: Tue, 14 Feb 2017 14:54:53 -0500 (EST)	[thread overview]
Message-ID: <Pine.LNX.4.44L0.1702141452590.1949-100000@iolanthe.rowland.org> (raw)
In-Reply-To: <20170214192743.GA3869@amd>

On Tue, 14 Feb 2017, Pavel Machek wrote:

> On Tue 2017-02-14 18:59:56, Pavel Machek wrote:
> > Hi!
> > 
> > > > > > Hmm. I moved keyboard between USB ports, and now 4.10-rc6 no longer
> > > > > > boots. v4.6 works ok. Let me try with keyboard unplugged... no, I
> > > > > > could not get it to work. I believe v4.9 and some v4.10-rc's worked,
> > > > > > but I'll have to double check.
> > > > > 
> > > > > But all the kernel versions worked when the keyboard was plugged into
> > > > > its original USB port?
> > > > 
> > > > Aha. So it looks difference is probably in "where is keyboard plugged
> > > > in" but in "reboot" vs. "cold boot". I did not do a cold boot in quite
> > > > a while :-(.
> > > > 
> > > > Booting to grub, then hitting ctrl-alt-del is enough to make it work. Ouch.
> > > > 
> > > > It happens with current Linus' tree.
> > > 
> > > v4.10-rc6-feb3 : broken
> > > v4.9 : ok
> > > (v4.6 : ok)
> > 
> > Hmm. It hangs during PCI fixups, and it hangs in v4.10-rc8, too.   
> > 
> > With debug patch below, I get
> > 
> > ...1d.7: PCI fixup... pass 2
> > ...1d.7: PCI fixup... pass 3
> > ...1d.7: PCI fixup... pass 3 done
> > 
> > ...followed by hang. So yes, it looks USB related.
> > 
> > (Sometimes it hangs with some kind backtrace involving secondary CPU
> > startup, unfortunately useful info is off screen at that point).
> 
> Forgot to say, 1d.7 is EHCI controller.
> 
> 00:1d.7 USB controller: Intel Corporation NM10/ICH7 Family USB2 EHCI
> Controller (rev 01)

So this looks like a problem in the PCI subsystem affecting a USB
controller.

Linus is right; bisection is the best approach now that you know a
reliable trigger.

Alan Stern

  reply	other threads:[~2017-02-14 19:54 UTC|newest]

Thread overview: 39+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <20170203190414.GA3701@amd>
     [not found] ` <Pine.LNX.4.44L0.1702031415140.1794-100000@iolanthe.rowland.org>
2017-02-03 20:51   ` v4.10-rc6 " Pavel Machek
2017-02-03 21:18     ` Pavel Machek
2017-02-03 21:59       ` Alan Stern
2017-02-03 22:43         ` Pavel Machek
2017-02-04  8:48           ` Pavel Machek
2017-02-04 16:52             ` Pavel Machek
2017-02-12 12:00             ` Pavel Machek
2017-02-14 17:59       ` v4.10-rc8 (-rc6) " Pavel Machek
2017-02-14 19:27         ` Pavel Machek
2017-02-14 19:54           ` Alan Stern [this message]
2017-02-23 16:28           ` Frederic Weisbecker
2017-02-23 18:40             ` Pavel Machek
2017-02-25  3:28               ` Frederic Weisbecker
2017-03-18 14:42               ` Frederic Weisbecker
2017-04-03 15:38               ` Frederic Weisbecker
2017-04-03 18:20                 ` Pavel Machek
2017-04-12 15:08                   ` Frederic Weisbecker
2017-04-15 21:34                     ` Pavel Machek
2017-04-20 14:52                       ` Frederic Weisbecker
     [not found]         ` <CA+55aFyYAztA+Onquy9ODeC9_YBL_fXAd-RgeUVUhpsjK81ZVQ@mail.gmail.com>
     [not found]           ` <CA+55aFxU1D0hAPJuhkKaFBByi=8vpw7dJUX=FfpoqnZLWsvxig@mail.gmail.com>
     [not found]             ` <CA+55aFwt6pbt2STzRh1yCdoo7AnCLFqnPkkrYk4_BGFuvT2VCw@mail.gmail.com>
     [not found]               ` <CA+55aFzMiXXw9gqNCMCSc+O5HfcqWHXfqbdtbvcOmAHM9_wNig@mail.gmail.com>
     [not found]                 ` <CA+55aFxuXgsCyMgrRDHdM6BQaej68QoU8TwdM=3LYu9LMBf4fQ@mail.gmail.com>
2017-02-15 17:23                   ` Pavel Machek
2017-02-15 23:20                     ` Pavel Machek
2017-02-15 23:34                       ` Linus Torvalds
2017-02-16 11:11                         ` Pavel Machek
2017-02-16 17:25                           ` Pavel Machek
2017-02-16 18:13                             ` Frederic Weisbecker
2017-02-16 18:20                               ` Linus Torvalds
2017-02-16 18:34                                 ` Frederic Weisbecker
2017-02-16 19:34                                   ` Thomas Gleixner
2017-02-16 20:06                                     ` Pavel Machek
2017-02-16 20:21                                       ` Linus Torvalds
2017-02-16 20:48                                         ` Pavel Machek
2017-02-18  8:55                                         ` Pavel Machek
2017-02-17  1:11                                       ` Greg Kroah-Hartman
2017-02-17 14:04                                     ` Frederic Weisbecker
2017-02-17 16:37                                       ` Thomas Gleixner
2017-02-17 17:05                                         ` Pavel Machek
2017-02-17 18:43                                           ` Frederic Weisbecker
2017-02-16 19:06                             ` Pavel Machek
2017-02-17 14:40                               ` Frederic Weisbecker

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