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[GH-ISSUE #13587] backspace x line wrapping bug #8945

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opened 2026-04-12 21:46:06 -05:00 by GiteaMirror · 2 comments
GiteaMirror commented 2026-04-12 21:46:06 -05:00
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Originally created by @SeeTwoo on GitHub (Dec 30, 2025).
Original GitHub issue: https://github.com/ollama/ollama/issues/13587

What is the issue?

I have issues with line (prompt) editing in the terminal. When I backspace over a line wrap, one character is left undeleted on the screen but it does not seem to affect the buffer state.

it is for example possible to write a long prompt that triggers line wrapping, delete it all by using backspace and type /bye and it quits as it should even though a character is still visible.

I also noticed issues of the same class when resizing the terminal where visual representation and buffer state seamingly go out of sync.

I am using ubuntu 22.04.1 with the gnome terminal and ollama 0.13.5.

I’ve implemented line-editing logic in a shell before and ran into a similar issue; I’m happy to investigate or submit a PR if you think that would help. If I were to look into this, could you point me to the part of the codebase responsible for line editing / terminal input handling ?

Relevant log output

~ ollama --version
ollama version is 0.13.5
 ~ ollama run llama3.1:8b
>>> this is a really long prompt that will trigger line wrapping soon and he
... re we are


*after hitting bacspace a few times

 ~ ollama run llama3.1:8b
>>> this is a really long prompt that will trigger line wr                h

OS

Linux

GPU

Nvidia

CPU

AMD

Ollama version

0.13.5

Originally created by @SeeTwoo on GitHub (Dec 30, 2025). Original GitHub issue: https://github.com/ollama/ollama/issues/13587 ### What is the issue? I have issues with line (prompt) editing in the terminal. When I backspace over a line wrap, one character is left undeleted on the screen but it does not seem to affect the buffer state. it is for example possible to write a long prompt that triggers line wrapping, delete it all by using backspace and type /bye and it quits as it should even though a character is still visible. I also noticed issues of the same class when resizing the terminal where visual representation and buffer state seamingly go out of sync. I am using ubuntu 22.04.1 with the gnome terminal and ollama 0.13.5. I’ve implemented line-editing logic in a shell before and ran into a similar issue; I’m happy to investigate or submit a PR if you think that would help. If I were to look into this, could you point me to the part of the codebase responsible for line editing / terminal input handling ? ### Relevant log output ```shell ~ ollama --version ollama version is 0.13.5 ~ ollama run llama3.1:8b >>> this is a really long prompt that will trigger line wrapping soon and he ... re we are *after hitting bacspace a few times ~ ollama run llama3.1:8b >>> this is a really long prompt that will trigger line wr h ``` ### OS Linux ### GPU Nvidia ### CPU AMD ### Ollama version 0.13.5
GiteaMirror added the bug label 2026-04-12 21:46:06 -05:00
GiteaMirror commented 2026-04-12 21:46:08 -05:00
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@Savior-Bei-Fong commented on GitHub (Dec 30, 2025):

FROM CHATGPT... for the problem resolving
to fix it

This behavior is not a model loading error
It is a known terminal / TTY input bug in older Ollama versions (including 0.13.5) that occurs when:
Long prompts
Automatic line wrapping
Backspace or cursor movement
are combined.
🔍 What exactly is happening?
Symptoms
You start Ollama:
Code copyied
Bash
ollama run llama3.1:8b
You type a very long prompt
The terminal wraps the line automatically
You press Backspace or move the cursor
Result:
Input gets corrupted
Text is cut off
Cursor jumps
Ollama stops reacting correctly
Important
❌ The model is NOT broken
❌ There is no inference or loading error
✅ The issue is purely terminal input handling
🧠 Technical Root Cause
Ollama 0.13.x has known issues with:
readline / terminal raw mode
Multi-line input handling
Backspace behavior on wrapped lines
Incorrect cursor position reporting by terminals
Internally:
Ollama processes input line-based
The terminal reports wrong cursor positions
Backspace deletes the wrong characters
The prompt buffer becomes inconsistent
This happens especially on:
PowerShell
CMD
Some WSL terminals
Older terminal builds
✅ Recommended Fixes (Best → Acceptable)
1️⃣ Do NOT type long prompts interactively (BEST solution)
Use a pipe:
Code copying
Bash
echo "your very long prompt here ..." | ollama run llama3.1:8b
Or a file:
Code copying
Bash
ollama run llama3.1:8b < prompt.txt
✔ 100% stable
✔ No line wrapping
✔ No cursor issues
2️⃣ Use --prompt
Code copying
Bash
ollama run llama3.1:8b --prompt "Very long prompt here ..."
3️⃣ Intentionally add line breaks
Instead of one huge line:
Code copying

This is a long prompt.
With intentional line breaks.
This avoids wrapping bugs.
🔄 Update Recommendation (IMPORTANT)
Ollama 0.13.5 is outdated
Newer versions partially fixed these TTY bugs
Check version
Code copying
Bash

___________ this is what you need _____________

ollama version
Update
Linux / macOS
Code copying
Bash
curl -fsSL https://ollama.com/install.sh | sh
Windows Download the latest installer: https://ollama.com/download
The installer safely overwrites the old version.
🧪 Terminal Compatibility
❌ More problematic
PowerShell (older builds)
CMD
Some WSL terminals
✅ More stable
Windows Terminal (up to date)
Linux: bash, zsh
macOS Terminal
iTerm2
🛠 Debug & Diagnostics
Enable debug output:
Code kopieren
Bash
OLLAMA_DEBUG=1 ollama run llama3.1:8b
View logs:
Code kopieren
Bash
ollama logs
🧩 Summary
✔ No model bug
✔ No llama3.1 issue
✔ Pure TTY / input handling problem
Best Practices
Use files or pipes for long prompts
Keep Ollama updated
Use interactive mode only for short input

<!-- gh-comment-id:3700112885 --> @Savior-Bei-Fong commented on GitHub (Dec 30, 2025): FROM CHATGPT... for the problem resolving to fix it This behavior is not a model loading error It is a known terminal / TTY input bug in older Ollama versions (including 0.13.5) that occurs when: Long prompts Automatic line wrapping Backspace or cursor movement are combined. 🔍 What exactly is happening? Symptoms You start Ollama: Code copyied Bash ollama run llama3.1:8b You type a very long prompt The terminal wraps the line automatically You press Backspace or move the cursor Result: Input gets corrupted Text is cut off Cursor jumps Ollama stops reacting correctly Important ❌ The model is NOT broken ❌ There is no inference or loading error ✅ The issue is purely terminal input handling 🧠 Technical Root Cause Ollama 0.13.x has known issues with: readline / terminal raw mode Multi-line input handling Backspace behavior on wrapped lines Incorrect cursor position reporting by terminals Internally: Ollama processes input line-based The terminal reports wrong cursor positions Backspace deletes the wrong characters The prompt buffer becomes inconsistent This happens especially on: PowerShell CMD Some WSL terminals Older terminal builds ✅ Recommended Fixes (Best → Acceptable) 1️⃣ Do NOT type long prompts interactively (BEST solution) Use a pipe: Code copying Bash echo "your very long prompt here ..." | ollama run llama3.1:8b Or a file: Code copying Bash ollama run llama3.1:8b < prompt.txt ✔ 100% stable ✔ No line wrapping ✔ No cursor issues 2️⃣ Use --prompt Code copying Bash ollama run llama3.1:8b --prompt "Very long prompt here ..." 3️⃣ Intentionally add line breaks Instead of one huge line: Code copying This is a long prompt. With intentional line breaks. This avoids wrapping bugs. 🔄 Update Recommendation (IMPORTANT) Ollama 0.13.5 is outdated Newer versions partially fixed these TTY bugs Check version Code copying Bash ___________ this is what you need _____________ ollama version Update Linux / macOS Code copying Bash curl -fsSL https://ollama.com/install.sh | sh Windows Download the latest installer: https://ollama.com/download The installer safely overwrites the old version. 🧪 Terminal Compatibility ❌ More problematic PowerShell (older builds) CMD Some WSL terminals ✅ More stable Windows Terminal (up to date) Linux: bash, zsh macOS Terminal iTerm2 🛠 Debug & Diagnostics Enable debug output: Code kopieren Bash OLLAMA_DEBUG=1 ollama run llama3.1:8b View logs: Code kopieren Bash ollama logs 🧩 Summary ✔ No model bug ✔ No llama3.1 issue ✔ Pure TTY / input handling problem Best Practices Use files or pipes for long prompts Keep Ollama updated Use interactive mode only for short input
GiteaMirror commented 2026-04-12 21:46:08 -05:00
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@rick-github commented on GitHub (Dec 31, 2025):

@Savior-Bei-Fong Please don't post AI slop that has obvious errors.

<!-- gh-comment-id:3701342113 --> @rick-github commented on GitHub (Dec 31, 2025): @Savior-Bei-Fong Please don't post AI slop that has obvious errors.
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Reference: github-starred/ollama#8945