[Bug 1857449] [NEW] QEMU x86_64 -nographic full system breaks host Bash terminal line wrapping state after simulation ends, requires reset or "tput smam" to fix it

[Bug 1857449] [NEW] QEMU x86_64 -nographic full system breaks host Bash terminal line wrapping state after simulation ends, requires reset or "tput smam" to fix it

[Ciro Santilli 六四事件 法轮功]

Public bug reported:

QEMU 4.2.0 compiled from source, Ubuntu 19.10, open a fresh new gnome
terminal.

If you print 1000 = chars on the host terminal, then they do wrap around
the end of the terminal:

printf "=%.0s" {0..1000}

However, if you first run QEMU:

x86_64-softmmu/qemu-system-x86_64 -nographic

and then quit it in any way, e.g. with Ctrl + A, and then re-run on the
host terminal:

printf "=%.0s" {0..1000}

then the signs don't wrap around anymore, they just go "off the terminal
to the right".

This can be fixed with either:

reset
tpam smam

but unfortunately those don't work in tmux for some reason:
https://github.com/tmux/tmux/issues/969

I consider this buggy behavior, QEMU should restore the original
terminal state if possible.

Related: https://github.com/cirosantilli/linux-kernel-module-
cheat/issues/110

** Affects: qemu
     Importance: Undecided
         Status: New

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Title:
  QEMU x86_64 -nographic full system breaks host Bash terminal line
  wrapping state after simulation ends, requires reset or "tput smam" to
  fix it

Status in QEMU:
  New

Bug description:
  QEMU 4.2.0 compiled from source, Ubuntu 19.10, open a fresh new gnome
  terminal.

  If you print 1000 = chars on the host terminal, then they do wrap
  around the end of the terminal:

  printf "=%.0s" {0..1000}

  However, if you first run QEMU:

  x86_64-softmmu/qemu-system-x86_64 -nographic

  and then quit it in any way, e.g. with Ctrl + A, and then re-run on
  the host terminal:

  printf "=%.0s" {0..1000}

  then the signs don't wrap around anymore, they just go "off the
  terminal to the right".

  This can be fixed with either:

  reset
  tpam smam

  but unfortunately those don't work in tmux for some reason:
  https://github.com/tmux/tmux/issues/969

  I consider this buggy behavior, QEMU should restore the original
  terminal state if possible.

  Related: https://github.com/cirosantilli/linux-kernel-module-
  cheat/issues/110

To manage notifications about this bug go to:
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[Bug 1857449] Re: QEMU x86_64 -nographic full system breaks host Bash terminal line wrapping state after simulation ends, requires reset or "tput smam" to fix it

[Philippe Mathieu-Daudé]

Apparently the code you run (BIOS?) is sending the DECRST control sequence to the terminal, which disable the auto-wrap mode flag.
Looking at the detailed explanations on https://github.com/mattiase/wraptest I'm not sure how QEMU can save/restore this flag.

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https://bugs.launchpad.net/bugs/1857449

Title:
  QEMU x86_64 -nographic full system breaks host Bash terminal line
  wrapping state after simulation ends, requires reset or "tput smam" to
  fix it

Status in QEMU:
  New

Bug description:
  QEMU 4.2.0 compiled from source, Ubuntu 19.10, open a fresh new gnome
  terminal.

  If you print 1000 = chars on the host terminal, then they do wrap
  around the end of the terminal:

  printf "=%.0s" {0..1000}

  However, if you first run QEMU:

  x86_64-softmmu/qemu-system-x86_64 -nographic

  and then quit it in any way, e.g. with Ctrl + A, and then re-run on
  the host terminal:

  printf "=%.0s" {0..1000}

  then the signs don't wrap around anymore, they just go "off the
  terminal to the right".

  This can be fixed with either:

  reset
  tpam smam

  but unfortunately those don't work in tmux for some reason:
  https://github.com/tmux/tmux/issues/969

  I consider this buggy behavior, QEMU should restore the original
  terminal state if possible.

  Related: https://github.com/cirosantilli/linux-kernel-module-
  cheat/issues/110

To manage notifications about this bug go to:
https://bugs.launchpad.net/qemu/+bug/1857449/+subscriptions

[Bug 1857449] Re: QEMU x86_64 -nographic full system breaks host Bash terminal line wrapping state after simulation ends, requires reset or "tput smam" to fix it

[Ciro Santilli 六四事件 法轮功]

Ah, thanks for looking into this and identifying it to guest code
Philippe. I don't know much about terminals, but yes, they are such
archaic interfaces, maybe there is no API for it :-(

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https://bugs.launchpad.net/bugs/1857449

Title:
  QEMU x86_64 -nographic full system breaks host Bash terminal line
  wrapping state after simulation ends, requires reset or "tput smam" to
  fix it

Status in QEMU:
  New

Bug description:
  QEMU 4.2.0 compiled from source, Ubuntu 19.10, open a fresh new gnome
  terminal.

  If you print 1000 = chars on the host terminal, then they do wrap
  around the end of the terminal:

  printf "=%.0s" {0..1000}

  However, if you first run QEMU:

  x86_64-softmmu/qemu-system-x86_64 -nographic

  and then quit it in any way, e.g. with Ctrl + A, and then re-run on
  the host terminal:

  printf "=%.0s" {0..1000}

  then the signs don't wrap around anymore, they just go "off the
  terminal to the right".

  This can be fixed with either:

  reset
  tpam smam

  but unfortunately those don't work in tmux for some reason:
  https://github.com/tmux/tmux/issues/969

  I consider this buggy behavior, QEMU should restore the original
  terminal state if possible.

  Related: https://github.com/cirosantilli/linux-kernel-module-
  cheat/issues/110

To manage notifications about this bug go to:
https://bugs.launchpad.net/qemu/+bug/1857449/+subscriptions

[Bug 1857449] Re: QEMU x86_64 -nographic full system breaks host Bash terminal line wrapping state after simulation ends, requires reset or "tput smam" to fix it

[Thomas Huth]

The QEMU project is currently considering to move its bug tracking to
another system. For this we need to know which bugs are still valid
and which could be closed already. Thus we are setting older bugs to
"Incomplete" now.

If you still think this bug report here is valid, then please switch
the state back to "New" within the next 60 days, otherwise this report
will be marked as "Expired". Or please mark it as "Fix Released" if
the problem has been solved with a newer version of QEMU already.

Thank you and sorry for the inconvenience.


** Changed in: qemu
       Status: New => Incomplete

-- 
You received this bug notification because you are a member of qemu-
devel-ml, which is subscribed to QEMU.
https://bugs.launchpad.net/bugs/1857449

Title:
  QEMU x86_64 -nographic full system breaks host Bash terminal line
  wrapping state after simulation ends, requires reset or "tput smam" to
  fix it

Status in QEMU:
  Incomplete

Bug description:
  QEMU 4.2.0 compiled from source, Ubuntu 19.10, open a fresh new gnome
  terminal.

  If you print 1000 = chars on the host terminal, then they do wrap
  around the end of the terminal:

  printf "=%.0s" {0..1000}

  However, if you first run QEMU:

  x86_64-softmmu/qemu-system-x86_64 -nographic

  and then quit it in any way, e.g. with Ctrl + A, and then re-run on
  the host terminal:

  printf "=%.0s" {0..1000}

  then the signs don't wrap around anymore, they just go "off the
  terminal to the right".

  This can be fixed with either:

  reset
  tpam smam

  but unfortunately those don't work in tmux for some reason:
  https://github.com/tmux/tmux/issues/969

  I consider this buggy behavior, QEMU should restore the original
  terminal state if possible.

  Related: https://github.com/cirosantilli/linux-kernel-module-
  cheat/issues/110

To manage notifications about this bug go to:
https://bugs.launchpad.net/qemu/+bug/1857449/+subscriptions

[Bug 1857449] Re: QEMU x86_64 -nographic full system breaks host Bash terminal line wrapping state after simulation ends, requires reset or "tput smam" to fix it

[Launchpad Bug Tracker]

[Expired for QEMU because there has been no activity for 60 days.]

** Changed in: qemu
       Status: Incomplete => Expired

-- 
You received this bug notification because you are a member of qemu-
devel-ml, which is subscribed to QEMU.
https://bugs.launchpad.net/bugs/1857449

Title:
  QEMU x86_64 -nographic full system breaks host Bash terminal line
  wrapping state after simulation ends, requires reset or "tput smam" to
  fix it

Status in QEMU:
  Expired

Bug description:
  QEMU 4.2.0 compiled from source, Ubuntu 19.10, open a fresh new gnome
  terminal.

  If you print 1000 = chars on the host terminal, then they do wrap
  around the end of the terminal:

  printf "=%.0s" {0..1000}

  However, if you first run QEMU:

  x86_64-softmmu/qemu-system-x86_64 -nographic

  and then quit it in any way, e.g. with Ctrl + A, and then re-run on
  the host terminal:

  printf "=%.0s" {0..1000}

  then the signs don't wrap around anymore, they just go "off the
  terminal to the right".

  This can be fixed with either:

  reset
  tpam smam

  but unfortunately those don't work in tmux for some reason:
  https://github.com/tmux/tmux/issues/969

  I consider this buggy behavior, QEMU should restore the original
  terminal state if possible.

  Related: https://github.com/cirosantilli/linux-kernel-module-
  cheat/issues/110

To manage notifications about this bug go to:
https://bugs.launchpad.net/qemu/+bug/1857449/+subscriptions