linux-kernel - [BUG][4.5-rc5] rcu_shed self-detected stall on CPU

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Message-ID: <CAA85sZs+Qq_O-x1h7UOSYjPHFsa9dkkuAdNcPeK9=zu5qng7dg@mail.gmail.com>
Date:	Mon, 22 Feb 2016 01:38:34 +0100
From:	Ian Kumlien <ian.kumlien@...il.com>
To:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: [BUG][4.5-rc5] rcu_shed self-detected stall on CPU - directly after
 network goes online.

Hi,

When i tried to upgrade my, soon to be, firewall to 4.5-rc5 to do some
testing - it deadlocked almost instantly.

In the photo, i started writing "root" and it keeps repeating it, like
it's in a while loop.

https://goo.gl/photos/yGhNSogJjeb2VJyu5

Trying to get better information - as in any - i enabled quite a few
debugging options that could have any bearing on it and ended up with:
https://goo.gl/photos/NnQER2WXXJ5ZWPR67

The interesting part is that in this case the machine was booted in to
single user mode and did not crash.

It seems like it gets in to trouble when the bridges and the network
interfaces are enabled, as in just about a second or two after boot.

Anyone that has a clue of what i should be looking at/for?

lspci output:
00:00.0 Host bridge: Intel Corporation Atom processor C2000 SoC
Transaction Router (rev 02)
00:01.0 PCI bridge: Intel Corporation Atom processor C2000 PCIe Root
Port 1 (rev 02)
00:02.0 PCI bridge: Intel Corporation Atom processor C2000 PCIe Root
Port 2 (rev 02)
00:03.0 PCI bridge: Intel Corporation Atom processor C2000 PCIe Root
Port 3 (rev 02)
00:04.0 PCI bridge: Intel Corporation Atom processor C2000 PCIe Root
Port 4 (rev 02)
00:0b.0 Co-processor: Intel Corporation Atom processor C2000 QAT (rev 02)
00:0e.0 Host bridge: Intel Corporation Atom processor C2000 RAS (rev 02)
00:0f.0 IOMMU: Intel Corporation Atom processor C2000 RCEC (rev 02)
00:13.0 System peripheral: Intel Corporation Atom processor C2000
SMBus 2.0 (rev 02)
00:14.0 Ethernet controller: Intel Corporation Ethernet Connection I354 (rev 03)
00:14.1 Ethernet controller: Intel Corporation Ethernet Connection I354 (rev 03)
00:14.2 Ethernet controller: Intel Corporation Ethernet Connection I354 (rev 03)
00:14.3 Ethernet controller: Intel Corporation Ethernet Connection I354 (rev 03)
00:16.0 USB controller: Intel Corporation Atom processor C2000 USB
Enhanced Host Controller (rev 02)
00:17.0 SATA controller: Intel Corporation Atom processor C2000 AHCI
SATA2 Controller (rev 02)
00:18.0 SATA controller: Intel Corporation Atom processor C2000 AHCI
SATA3 Controller (rev 02)
00:1f.0 ISA bridge: Intel Corporation Atom processor C2000 PCU (rev 02)
00:1f.3 SMBus: Intel Corporation Atom processor C2000 PCU SMBus (rev 02)
02:00.0 PCI bridge: ASPEED Technology, Inc. AST1150 PCI-to-PCI Bridge (rev 03)
03:00.0 VGA compatible controller: ASPEED Technology, Inc. ASPEED
Graphics Family (rev 30)
04:00.0 Ethernet controller: Intel Corporation I210 Gigabit Network
Connection (rev 03)
05:00.0 Ethernet controller: Intel Corporation I350 Gigabit Network
Connection (rev 01)
05:00.1 Ethernet controller: Intel Corporation I350 Gigabit Network
Connection (rev 01)