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[Bug] Claude Code hangs when resuming certain conversations with large tool outputs in history #19036
Closed as duplicate
Description
Bug Description
When resuming a session that contains a large tool output (e.g., a 1.4MB git diff or file read), Claude Code
freezes/hangs while attempting to render the session history in the terminal
Steps to Reproduce
- Start a Claude Code session
- Run a command that produces large output (e.g., git diff on many files, reading a large file)
- Exit the session
- Try to resume the session using /resume or the resume picker
Environment Info
- Platform: darwin
- Terminal: WarpTerminal
- Version: 2.1.12
- Feedback ID: 091effec-806d-4c2a-9fe8-18eadf912300
Expected Behavior
Session resumes normally, possibly with large outputs truncated or lazily loaded.
Actual Behavior
Claude Code hangs indefinitely. Terminal becomes unresponsive. CPU usage spikes to 100%.
Activity
github-actions commentedon Jan 18, 2026
Found 3 possible duplicate issues:
This issue will be automatically closed as a duplicate in 3 days.
🤖 Generated with Claude Code
jsayubi commentedon Jan 18, 2026
Adding debug evidence from my investigation (issue #19036, closing as duplicate):
Environment: macOS Darwin 25.2.0, Claude Code 2.1.12, Warp Terminal
Session file analysis:
Debug log showing the hang:
High write ratio: blit=0, write=18913 (100.0% writes), screen=467x123
When resuming, Claude Code attempts to render all 82 messages at once, including the 1.4MB entry, causing 18,913
terminal writes that completely freeze the UI. CPU spikes to 100% and the process becomes unresponsive.
Closing #19036 as duplicate.
github-actions commentedon Jan 26, 2026
This issue has been automatically locked since it was closed and has not had any activity for 7 days. If you're experiencing a similar issue, please file a new issue and reference this one if it's relevant.