integrity_violation: render_row_count_mismatch causes terminal crash

[Konoxx]

Description

Terminal sessions crash with integrity_violation errors, specifically render_row_count_mismatch. This appears to be triggered when resuming sessions with large scrollback buffers.

Error logs

{"ts":1776269568,"source":"ghostty","event":"integrity_violation","severity":"error","reason":"render_row_count_mismatch","detail":1,"pid":28165}

Often preceded by multiple:

{"ts":1776269349,"source":"ghostty","event":"integrity_violation","severity":"error","reason":"increase_capacity_capped_at_std_size","detail":606208,"pid":28165}

Environment

• Ghostty version: 1.3.0 (custom build "Ghostivate")
• macOS: 15.7.5 (Build 24G624)
• scrollback-limit: 50000000 (50MB)

Reproduction

1. Have a terminal session with significant scrollback
2. Run a command that produces large output (e.g., resuming a Claude Code session with ~2MB JSONL context)
3. Terminal crashes with render_row_count_mismatch

Workaround

Reducing scrollback-limit from 50MB to 10MB appears to mitigate but not eliminate the issue.

Additional context

The increase_capacity_capped_at_std_size errors (detail: 606208) suggest the terminal buffer is hitting capacity limits, which may be corrupting internal state leading to render_row_count_mismatch.

[ghostty-vouch]

Hi @Konoxx, thanks for your interest!

This project requires that issue reporters are vouched, and you are not in the list of vouched users.

This issue will be closed automatically. See https://github.com/ghostty-org/ghostty/blob/main/CONTRIBUTING.md for more details.

[mitchellh]

Might be fixed here: #12300