[Bug] Input box stops accepting keystrokes in 2.1.282 after 0-90 seconds into session #96931

Bug Description
2.1.282: input box stops accepting keystrokes ~30 s into every session (2.1.281 fine)*

Summary
Since 2.1.282, every interactive session stops taking keyboard input within 0–90 s. This happens mid-typing. Nothing redraws, and Ctrl-C does nothing. The process stays alive at ~0% CPU and keeps sending presence/heartbeat pulses, so it hasn't crashed or hung: the input box has been disconnected. Rolling back to 2.1.281 (same config, same folder, same terminal) fixes it completely.

Environment

• Claude Code 2.1.282 native install. 2.1.281 is the last good version.
• FreeBSD 15.1-RELEASE with Linux binary compatibility (the Linux build runs under the Linuxulator)
• Konsole, TERM=xterm-256color, launched with --dangerously-skip-permissions, env BUN_JSC_useBBQJIT=0

Evidence

• On 2026-09-24, 11 sessions on 2.1.282 each went unresponsive within 0–90 s. That includes sessions after a reboot and sessions run with a stripped config (no hooks or plugins). 2.1.281 sessions run for hours.
• Reproduced with --debug. Keystrokes render until 01:30:50Z, then:

  01:30:54.427Z Fast mode unavailable: Fast mode requires usage credits
  01:30:54.433Z prompt.edit: unhooked; the composer relays nothing
  01:30:54.438Z AutoUpdaterWrapper: Installation type: native
  01:30:54.439Z [FileIndex] getProjectFiles called, respectGitignore=true
  

  After this only presence pulses and heartbeats appear. No further input is processed.
  (prompt.edit: unhooked also appears at startup in every 2.1.282 log, so it may not be the trigger.)
• The first repro log shows fullscreen boot canary: healthy, which suggested the new fullscreen trial, but see the next section: disabling the alternate screen does not fix it.
• Thread snapshot while frozen: all threads idle in futex/kqread/select, 0.2% CPU.

Test with CLAUDE_CODE_DISABLE_ALTERNATE_SCREEN=1
Still freezes. With CLAUDE_CODE_DISABLE_ALTERNATE_SCREEN=1 the log has no fullscreen lines at all. A prompt ran to completion ([engine] turn 1 end ... stop=end_turn at 01:36:11.033Z, result rendered), ~/.claude.json was written at 01:36:11.061Z, and from then on no keystroke registered: only heartbeats. So the freeze happens with or without fullscreen, either mid-typing (run 1) or right after a turn ends (run 2).

Attachments: full debug log 2.1.282-freeze-debug.txt, thread snapshot 2.1.282-freeze-threads.txt, second run log 2.1.282-freeze2-noaltscreen-debug.txt

Environment Info

• Platform: linux
• Terminal: konsole
• Version: 2.1.281
• Feedback ID: 072a8761-a554-4db0-83d6-a276bc2da386

Errors

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