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[Bug 1485057] Re: "lsusb -v" as root freezes the kernel on Acer ES1-111

To: kernel-packages@xxxxxxxxxxxxxxxxxxx
From: Roland Weber <r-o-l@xxxxxx>
Date: Tue, 25 Aug 2015 15:53:39 -0000
Reply-to: Bug 1485057 <1485057@xxxxxxxxxxxxxxxxxx>
Sender: bounces@xxxxxxxxxxxxx

I've verified that the freeze on shutdown is caused by the same commit.

Contrary to my initial report here, the freeze on shutdown happens late in the sequence, not early.
I'm used to much longer shutdown times from my desktop :-)

** Summary changed:

- "lsusb -v" as root freezes the kernel on Acer ES1-111
+ "lsusb -v" as root freezes the kernel on Acer ES1-111; also freeze on shutdown

** Description changed:

reproducible: always

Steps to reproduce:
- open a terminal
- sudo bash
- lsusb -v

In a virtual terminal, the command prints the name of the first device
it finds, then the system freezes completely. In a terminal of the
desktop, I don't even get the name of the device, the system freezes
immediately. Either way, I have to power off the machine. There is no
kernel oops. Nothing is written to the log. The magic sysreq key yields
no response, although I have verified that it works before triggering
the freeze.

I've narrowed down the problem by calling "lsusb -v -s <device>". The
system freezes on both devices of bus 3 (003:001 and 003:002). For all
other devices, it prints the expected output and continues to work. When
calling lsusb as a regular user, I get "Couldn't open device, some
information will be missing", then the regular output, and the system
keeps running. Therefore I assume that the problem is somewhere in the
kernel, when the devices are accessed.

This is a regression. It used to work in 14.10, and fails to work since 15.04.
It also used to work in 14.04.2, and fails in 14.04.3.
It fails with mainline builds 4.2.0-rc6-unstable, 4.2.0-rc2-unstable, 4.1.0-rc2-vivid. (yeah, I've been trying for a while :-)

- Incidentally, the shutdown sequence also freezes early on with the
- kernels that exhibit the problem; but I cannot be sure that the cause is
- the same. I decided to first chase the USB freeze, because it was easier
- to gather information about that.
+ Incidentally, the shutdown sequence also freezes with the kernels that
+ exhibit the problem; but I cannot be sure that the cause is the same. I
+ decided to first chase the USB freeze, because it was easier to gather
+ information about that.

ProblemType: Bug
DistroRelease: Ubuntu 15.04
Package: linux-image-3.19.0-25-generic 3.19.0-25.26
ProcVersionSignature: Ubuntu 3.19.0-25.26-generic 3.19.8-ckt2
Uname: Linux 3.19.0-25-generic x86_64
ApportVersion: 2.17.2-0ubuntu1.2
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC0: rweber 1525 F.... pulseaudio
CurrentDesktop: XFCE
Date: Fri Aug 14 18:38:36 2015
HibernationDevice: RESUME=UUID=8a45266d-0232-428e-bb25-113d23caaf8a
InstallationDate: Installed on 2015-06-28 (46 days ago)
InstallationMedia: Xubuntu 14.10 "Utopic Unicorn" - Release amd64 (20141022.1)
MachineType: Acer Aspire ES1-111M
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.19.0-25-generic root=UUID=b8872e03-7295-4cbd-ac86-06b9be2f112f ro quiet splash crashkernel=384M-:128M vt.handoff=7
RelatedPackageVersions:
linux-restricted-modules-3.19.0-25-generic N/A
linux-backports-modules-3.19.0-25-generic N/A
linux-firmware 1.143.3
SourcePackage: linux
UpgradeStatus: Upgraded to vivid on 2015-07-05 (39 days ago)
dmi.bios.date: 08/20/2014
dmi.bios.vendor: Insyde Corp.
dmi.bios.version: V1.08
dmi.board.asset.tag: Type2 - Board Asset Tag
dmi.board.name: R2
dmi.board.vendor: Acer
dmi.board.version: Type2 - A01 Board Version
dmi.chassis.type: 10
dmi.chassis.vendor: Chassis Manufacturer
dmi.chassis.version: Chassis Version
dmi.modalias: dmi:bvnInsydeCorp.:bvrV1.08:bd08/20/2014:svnAcer:pnAspireES1-111M:pvrV1.08:rvnAcer:rnR2:rvrType2-A01BoardVersion:cvnChassisManufacturer:ct10:cvrChassisVersion:
dmi.product.name: Aspire ES1-111M
dmi.product.version: V1.08
dmi.sys.vendor: Acer

--
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Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1485057

Title:
"lsusb -v" as root freezes the kernel on Acer ES1-111; also freeze on
shutdown

Status in linux package in Ubuntu:
Triaged

Bug description:
reproducible: always

Steps to reproduce:
- open a terminal
- sudo bash
- lsusb -v

In a virtual terminal, the command prints the name of the first device
it finds, then the system freezes completely. In a terminal of the
desktop, I don't even get the name of the device, the system freezes
immediately. Either way, I have to power off the machine. There is no
kernel oops. Nothing is written to the log. The magic sysreq key
yields no response, although I have verified that it works before
triggering the freeze.

I've narrowed down the problem by calling "lsusb -v -s <device>". The
system freezes on both devices of bus 3 (003:001 and 003:002). For all
other devices, it prints the expected output and continues to work.
When calling lsusb as a regular user, I get "Couldn't open device,
some information will be missing", then the regular output, and the
system keeps running. Therefore I assume that the problem is somewhere
in the kernel, when the devices are accessed.

Incidentally, the shutdown sequence also freezes with the kernels that
exhibit the problem; but I cannot be sure that the cause is the same.
I decided to first chase the USB freeze, because it was easier to
gather information about that.

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1485057/+subscriptions

References

[Bug 1485057] [NEW] "lsusb -v" as root freezes the kernel on Acer ES1-111
From: Roland Weber, 2015-08-14