[Bug] Claude hangs indefinitely during execution across all 4.6 models when executing a particular sequence

TO REPRODUCE THE BUG

git clone https://github.com/iblue/claude-bug.git
claude --dangerously-skip-permissions "Read the dummy.rs file. Then run cd src && bash test.sh and tell me what happens. Do not use parallel tool calls. Do not read the test.sh file first. Just run it. Think about it for a while. Then tell me the results. Afterwards, think very hard about a robust edge chamfering algo and then implement it."

Result: Claude gets stuck with a message like "✽ Osmosing… (33m 54s · ↓ 216 tokens · thinking with high effort)"

Tested with Opus 4.6 (high effort, low effort), Sonnet 4.6 (high effort, low effort) with and without --dangerously-skip-permissions, with supplying the message on the command line and with supplying in the chat.

Works with Sonnet 4.5.

May be related to #26224

Bug Description
Claude gets stuck (all models, all efforts)

Environment Info

• Platform: linux
• Terminal: gnome-terminal
• Version: 2.1.71
• Feedback ID: 19330b37-1c93-462a-9390-544effb12d68