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From: Bjorn Helgaas <helgaas@kernel.org>
To: Jesse Hathaway <jesse@mbuki-mvuki.org>
Cc: Ingo Molnar <mingo@redhat.com>,
	Peter Zijlstra <peterz@infradead.org>,
	linux-kernel@vger.kernel.org, linux-pci@vger.kernel.org,
	Mathias Nyman <mathias.nyman@intel.com>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Alan Stern <stern@rowland.harvard.edu>,
	linux-usb@vger.kernel.org
Subject: Re: Regression causes a hang on boot with a Comtrol PCI card
Date: Mon, 1 Apr 2019 16:13:53 -0500	[thread overview]
Message-ID: <20190401211353.GA7263@google.com> (raw)
In-Reply-To: <CANSNSoXhiYP4Ad3hO1v03aMOX1VtUao2yCLgj_J0z9fCNwWo5w@mail.gmail.com>

[+cc Mathias, Greg, Alan, linux-usb]

Beginning of thread: https://lore.kernel.org/linux-pci/CANSNSoWiKd98Dt1N2sSjP9Af8zk1NPV-=3P4VLtFs_cSQG4RUg@mail.gmail.com

Synopsis: v5.0 hangs at boot unless the following commits are reverted:

  1302fcf0d03e ("PCI: Configure *all* devices, not just hot-added ones")
  1c3c5eab1715 ("sched/core: Enable might_sleep() and smp_processor_id() checks early")

The hang appears to be in quirk_usb_early_handoff().  With
"initcall_debug", we see the call but not the completion:

On Fri, Mar 22, 2019 at 03:02:11PM -0500, Jesse Hathaway wrote:
> > So apparently the hang happens while we're running the "final" PCI
> > fixups.  This happens after all the rest of PCI is initialized.
> >
> > Can you boot v5.0 vanilla with "initcall_debug"?  Maybe we can narrow
> > it down to a specific quirk.
> 
> yup, added the "initcall_debug" output to the ticket:
> https://bugzilla.kernel.org/show_bug.cgi?id=202927, here is the tail end
> 
> [   14.896337] NET: Registered protocol family 1
> [   14.901314] initcall af_unix_init+0x0/0x4e returned 0 after 4866 usecs
> [   14.908694] calling  ipv6_offload_init+0x0/0x7f @ 1
> [   14.914238] initcall ipv6_offload_init+0x0/0x7f returned 0 after 1 usecs
> [   14.921821] calling  vlan_offload_init+0x0/0x20 @ 1
> [   14.927365] initcall vlan_offload_init+0x0/0x20 returned 0 after 0 usecs
> [   14.934948] calling  pci_apply_final_quirks+0x0/0x126 @ 1
> [   14.941106] pci 0000:00:1a.0: calling  quirk_usb_early_handoff+0x0/0x6a0 @ 1
> 
> thanks, Jesse Hathaway

  parent reply	other threads:[~2019-04-01 21:13 UTC|newest]

Thread overview: 20+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-03-13 16:50 Regression causes a hang on boot with a Comtrol PCI card Jesse Hathaway
2019-03-13 23:21 ` Bjorn Helgaas
2019-03-14 20:57   ` Jesse Hathaway
2019-03-21 20:36     ` Jesse Hathaway
2019-03-21 23:23     ` Bjorn Helgaas
2019-03-22 20:02       ` Jesse Hathaway
2019-04-01 19:43         ` Jesse Hathaway
2019-04-01 21:13         ` Bjorn Helgaas [this message]
2019-04-02 14:29           ` Alan Stern
2019-04-02 14:49             ` Mathias Nyman
2019-04-02 18:26               ` Alan Stern
2019-04-04 15:41             ` Jesse Hathaway
2019-04-04 17:16               ` Alan Stern
     [not found] <CANSNSoWL-2hP6j+nQwjr26vUmvyJ_Y1c9CrJ4bHnuqYCXhecdg@mail.gmail.com>
2019-04-04 19:14 ` Alan Stern
2019-04-05 21:27   ` Jesse Hathaway
2019-04-06 15:32     ` Alan Stern
2019-04-15 21:47       ` Jesse Hathaway
2019-04-16 15:00         ` Alan Stern
2019-04-23 20:18           ` Jesse Hathaway
2019-04-24 14:20             ` Alan Stern

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