Public bug reported:
I'm not sure I assigned this issue to the correct package.
The bug is either in bash, or in Ubuntu's application terminal, the one
that provides a terminal window to run bash in, which I think is xterm
but I'm not sure.
Also this could be triggered by either an issue in ssh or in vim which
is run on the remote server (see steps to reproduce below), BUT no
matter whether or not there's actually a bug in either of them, the
shell itself (or the terminal wrapper window) is almost certainly at
fault for not being robust against that.
So let's get to the issue.
What reproduced it for me:
1. I opened a terminal in Ubuntu on my laptop
2. In that terminal, I connected to a remote server using ssh
3. Within ssh, on the remote server I ran vim
4. Several hours passed and I suspended my local laptop
5. I resumed from suspend and went back to the terminal
At this point the connection with the remote server was obviously lost,
so as soon as I typed something, I was outside of ssh and in my local
shell.
6. I ran some commands locally in the terminal (obviously starting with
"clear" to clean up the mess left from quitting ssh while vim was open
on the remote server)
7. I clicked and dragged within the terminal to select some text
EXPECTED: the mouse should behave normally as it usually does when you
click and drag to select stuff in a terminal
OBSERVED: the terminal went berserk and for every movement of the mouse
while the mouse button was pressed, a bunch of gibberish characters
appeared.
Now, I understand that while I was connected to the remote server via ssh, and
running vim on it, the mouse had a certain behavior, which implies that somehow
information about the interaction of the mouse with the terminal is sent over
to the server where vim reacts to it. And I understand that both vim on the
server and ssh on the local machine exited abruptly when I suspended and
resumed my computer, and/or because of the hours of inactivity.
So, I understand that something about the way the terminal window, or bash
itself, handles mouse input, ramained in some unexpected status.
However, that that can happen is a bug. A ssh connection can be lost, and this
possibility must be taken into account.
The responsibility of this cannot by definition belong to vim or any other
software on the remote machine, because if the connection is broken there's
nothing the remote machine can do to prevent bad stuff from happening on the
local machine.
And I think the responsibility shouldn't fall on the ssh client either,
because any program launched by the shell (such as in this case ssh) can
die unexpectedly, or even behave malitiously, and once you exit from it,
the shell itself (or the terminal window that hosts it) MUST restore its
normal interaction with keyboard, mouse and whatever else.
However, if ssh is exiting gracefully after detecting a break in the
connection, then of course it should do its best to not leave its parent
shell in a mess of a state (even if the shell has a responsibility to
not be left in a mess of a state by a misbehaving ssh that doesn't do
its job properly when exiting).
ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: xterm 322-1ubuntu1
ProcVersionSignature: Ubuntu 4.4.0-173.203-generic 4.4.208
Uname: Linux 4.4.0-173-generic x86_64
NonfreeKernelModules: nvidia_uvm nvidia
.proc.driver.nvidia.gpus.0000.01.00.0: Error: [Errno 21] Is a directory:
'/proc/driver/nvidia/gpus/0000:01:00.0'
.proc.driver.nvidia.registry: Binary: ""
.proc.driver.nvidia.version:
NVRM version: NVIDIA UNIX x86_64 Kernel Module 340.107 Thu May 24 21:54:01
PDT 2018
GCC version: gcc version 5.4.0 20160609 (Ubuntu 5.4.0-6ubuntu1~16.04.12)
.tmp.unity_support_test.0:
ApportVersion: 2.20.1-0ubuntu2.23
Architecture: amd64
CompizPlugins: No value set for
`/apps/compiz-1/general/screen0/options/active_plugins'
CompositorRunning: compiz
CompositorUnredirectDriverBlacklist: '(nouveau|Intel).*Mesa 8.0'
CompositorUnredirectFSW: true
CurrentDesktop: Unity
Date: Mon May 4 18:40:15 2020
DistUpgraded: Fresh install
DistroCodename: xenial
DistroVariant: ubuntu
GraphicsCard:
Intel Corporation 3rd Gen Core processor Graphics Controller [8086:0166] (rev
09) (prog-if 00 [VGA controller])
Subsystem: Acer Incorporated [ALI] 3rd Gen Core processor Graphics
Controller [1025:0647]
NVIDIA Corporation GF117M [GeForce 610M/710M/810M/820M / GT
620M/625M/630M/720M] [10de:1140] (rev a1) (prog-if 00 [VGA controller])
Subsystem: Acer Incorporated [ALI] GeForce 710M [1025:0691]
InstallationDate: Installed on 2013-10-11 (2396 days ago)
InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Release amd64 (20130424)
MachineType: Acer Aspire V3-571G
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-173-generic
root=UUID=5830b30e-69e8-4bb4-8a2b-bc2b43c7414a ro quiet splash vt.handoff=7
SourcePackage: xterm
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 10/15/2012
dmi.bios.vendor: Acer
dmi.bios.version: V2.07
dmi.board.asset.tag: Type2 - Board Asset Tag
dmi.board.name: VA50_HC_CR
dmi.board.vendor: Acer
dmi.board.version: Type2 - Board Version
dmi.chassis.type: 10
dmi.chassis.vendor: Acer
dmi.chassis.version: V2.07
dmi.modalias:
dmi:bvnAcer:bvrV2.07:bd10/15/2012:svnAcer:pnAspireV3-571G:pvrV2.07:rvnAcer:rnVA50_HC_CR:rvrType2-BoardVersion:cvnAcer:ct10:cvrV2.07:
dmi.product.name: Aspire V3-571G
dmi.product.version: V2.07
dmi.sys.vendor: Acer
version.compiz: compiz 1:0.9.12.3+16.04.20180221-0ubuntu1
version.ia32-libs: ia32-libs N/A
version.libdrm2: libdrm2 2.4.91-2~16.04.1
version.libgl1-mesa-dri: libgl1-mesa-dri 18.0.5-0ubuntu0~16.04.1
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 18.0.5-0ubuntu0~16.04.1
version.nvidia-graphics-drivers: nvidia-graphics-drivers-* N/A
version.xserver-xorg-core: xserver-xorg-core 2:1.18.4-0ubuntu0.8
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.10.1-1ubuntu2
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.7.0-1
version.xserver-xorg-video-intel: xserver-xorg-video-intel
2:2.99.917+git20160325-1ubuntu1.2
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.12-1build2
xserver.bootTime: Fri Apr 17 02:39:40 2020
xserver.configfile: /etc/X11/xorg.conf
xserver.logfile: /var/log/Xorg.0.log
xserver.version: 2:1.18.4-0ubuntu0.8
** Affects: xterm (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug compiz-0.9 third-party-packages ubuntu xenial
** Description changed:
I'm not sure I assigned this issue to the correct package.
The bug is either in bash, or in Ubuntu's application terminal, the one
that provides a terminal window to run bash in, which I think is xterm
but I'm not sure.
Also this could be triggered by either an issue in ssh or in vim which
is run on the remote server (see steps to reproduce below), BUT no
matter whether or not there's actually a bug in either of them, the
- shell itself (or the terminal "wrapper application") is almost certainly
- at fault for not being resilient against that.
+ shell itself (or the terminal wrapper window) is almost certainly at
+ fault for not being robust against that.
So let's get to the issue.
What reproduced it for me:
1. I opened a terminal in Ubuntu on my laptop
2. In that terminal, I connected to a remote server using ssh
3. Within ssh, on the remote server I ran vim
4. Several hours passed and I suspended my local laptop
5. I resumed from suspend and went back to the terminal
At this point the connection with the remote server was obviously lost,
so as soon as I typed something, I was outside of ssh and in my local
shell.
6. I ran some commands locally in the terminal (obviously starting with
"clear" to clean up the mess left from quitting ssh while vim was open
on the remote server)
7. I clicked and dragged within the terminal to select some text
-
EXPECTED: the mouse should behave normally as it usually does when you
click and drag to select stuff in a terminal
OBSERVED: the terminal went berserk and for every movement of the mouse
while the mouse button was pressed, a bunch of gibberish characters
appeared.
-
- Now, I understand that while I was connected to the remote server via ssh,
and running vim on it, the mouse had a certain behavior, which implies that
somehow information about the interaction of the mouse with the terminal is
sent over to the server where vim reacts to it. And I understand that both vim
on the server and ssh on the local machine exited abruptly when I suspended and
resumed my computer, and/or because of the hours of inactivity.
+ Now, I understand that while I was connected to the remote server via ssh,
and running vim on it, the mouse had a certain behavior, which implies that
somehow information about the interaction of the mouse with the terminal is
sent over to the server where vim reacts to it. And I understand that both vim
on the server and ssh on the local machine exited abruptly when I suspended and
resumed my computer, and/or because of the hours of inactivity.
So, I understand that something about the way the terminal window, or bash
itself, handles mouse input, ramained in some unexpected status.
However, that that can happen is a bug. A ssh connection can be lost, and
this possibility must be taken into account.
The responsibility of this cannot by definition belong to vim or any other
software on the remote machine, because if the connection is broken there's
nothing the remote machine can do to prevent bad stuff from happening on the
local machine.
And I think the responsibility shouldn't fall on the ssh client either,
because any program launched by the shell (such as in this case ssh) can
die unexpectedly, or even behave malitiously, and once you exit from it,
the shell itself (or the terminal window that hosts it) MUST restore its
normal interaction with keyboard, mouse and whatever else.
However, if ssh is exiting gracefully after detecting a break in the
connection, then of course it should do its best to not leave its parent
shell in a mess of a state (even if the shell has a responsibility to
not be left in a mess of a state by a misbehaving ssh that doesn't do
its job properly when exiting).
ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: xterm 322-1ubuntu1
ProcVersionSignature: Ubuntu 4.4.0-173.203-generic 4.4.208
Uname: Linux 4.4.0-173-generic x86_64
NonfreeKernelModules: nvidia_uvm nvidia
.proc.driver.nvidia.gpus.0000.01.00.0: Error: [Errno 21] Is a directory:
'/proc/driver/nvidia/gpus/0000:01:00.0'
.proc.driver.nvidia.registry: Binary: ""
.proc.driver.nvidia.version:
- NVRM version: NVIDIA UNIX x86_64 Kernel Module 340.107 Thu May 24 21:54:01
PDT 2018
- GCC version: gcc version 5.4.0 20160609 (Ubuntu 5.4.0-6ubuntu1~16.04.12)
+ NVRM version: NVIDIA UNIX x86_64 Kernel Module 340.107 Thu May 24 21:54:01
PDT 2018
+ GCC version: gcc version 5.4.0 20160609 (Ubuntu 5.4.0-6ubuntu1~16.04.12)
.tmp.unity_support_test.0:
-
+
ApportVersion: 2.20.1-0ubuntu2.23
Architecture: amd64
CompizPlugins: No value set for
`/apps/compiz-1/general/screen0/options/active_plugins'
CompositorRunning: compiz
CompositorUnredirectDriverBlacklist: '(nouveau|Intel).*Mesa 8.0'
CompositorUnredirectFSW: true
CurrentDesktop: Unity
Date: Mon May 4 18:40:15 2020
DistUpgraded: Fresh install
DistroCodename: xenial
DistroVariant: ubuntu
GraphicsCard:
- Intel Corporation 3rd Gen Core processor Graphics Controller [8086:0166]
(rev 09) (prog-if 00 [VGA controller])
- Subsystem: Acer Incorporated [ALI] 3rd Gen Core processor Graphics
Controller [1025:0647]
- NVIDIA Corporation GF117M [GeForce 610M/710M/810M/820M / GT
620M/625M/630M/720M] [10de:1140] (rev a1) (prog-if 00 [VGA controller])
- Subsystem: Acer Incorporated [ALI] GeForce 710M [1025:0691]
+ Intel Corporation 3rd Gen Core processor Graphics Controller [8086:0166]
(rev 09) (prog-if 00 [VGA controller])
+ Subsystem: Acer Incorporated [ALI] 3rd Gen Core processor Graphics
Controller [1025:0647]
+ NVIDIA Corporation GF117M [GeForce 610M/710M/810M/820M / GT
620M/625M/630M/720M] [10de:1140] (rev a1) (prog-if 00 [VGA controller])
+ Subsystem: Acer Incorporated [ALI] GeForce 710M [1025:0691]
InstallationDate: Installed on 2013-10-11 (2396 days ago)
InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Release amd64 (20130424)
MachineType: Acer Aspire V3-571G
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-173-generic
root=UUID=5830b30e-69e8-4bb4-8a2b-bc2b43c7414a ro quiet splash vt.handoff=7
SourcePackage: xterm
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 10/15/2012
dmi.bios.vendor: Acer
dmi.bios.version: V2.07
dmi.board.asset.tag: Type2 - Board Asset Tag
dmi.board.name: VA50_HC_CR
dmi.board.vendor: Acer
dmi.board.version: Type2 - Board Version
dmi.chassis.type: 10
dmi.chassis.vendor: Acer
dmi.chassis.version: V2.07
dmi.modalias:
dmi:bvnAcer:bvrV2.07:bd10/15/2012:svnAcer:pnAspireV3-571G:pvrV2.07:rvnAcer:rnVA50_HC_CR:rvrType2-BoardVersion:cvnAcer:ct10:cvrV2.07:
dmi.product.name: Aspire V3-571G
dmi.product.version: V2.07
dmi.sys.vendor: Acer
version.compiz: compiz 1:0.9.12.3+16.04.20180221-0ubuntu1
version.ia32-libs: ia32-libs N/A
version.libdrm2: libdrm2 2.4.91-2~16.04.1
version.libgl1-mesa-dri: libgl1-mesa-dri 18.0.5-0ubuntu0~16.04.1
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 18.0.5-0ubuntu0~16.04.1
version.nvidia-graphics-drivers: nvidia-graphics-drivers-* N/A
version.xserver-xorg-core: xserver-xorg-core 2:1.18.4-0ubuntu0.8
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.10.1-1ubuntu2
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.7.0-1
version.xserver-xorg-video-intel: xserver-xorg-video-intel
2:2.99.917+git20160325-1ubuntu1.2
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau
1:1.0.12-1build2
xserver.bootTime: Fri Apr 17 02:39:40 2020
xserver.configfile: /etc/X11/xorg.conf
xserver.logfile: /var/log/Xorg.0.log
xserver.version: 2:1.18.4-0ubuntu0.8
--
You received this bug notification because you are a member of Ubuntu-X,
which is subscribed to xterm in Ubuntu.
https://bugs.launchpad.net/bugs/1876768
Title:
Terminal mouse went berserk after lost ssh connection
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/xterm/+bug/1876768/+subscriptions
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