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plat_child_read returned -1 both for a broken pipe and for a child that sent nothing for PLAT_CHILD_READ_MS (120 s), and svc_request retried any failure once on a fresh child. The translator is deterministic, so a program it hangs on hangs the second child too: a compute shader, which the replay thread looks up synchronously (vk_exec_draw.c shader_for), held the game for about 4 minutes instead of 2. plat_child_read now returns -2 on the timeout (win32.c and linux.c), child_exchange_raw returns 1, 0 for a broken pipe or a child that could not start, and -1 for the timeout, and svc_request stops the child and gives -1 without asking again; a dead child is still restarted once. translate_one fails such a request with its own reason, keeps its job and code for diagnosis and deletes whatever the stopped child wrote. The carry pass's child runs at idle priority, so a busy machine can starve it that long: carry_exchange does not resend after a timeout either, and carry_translate counts it as a failed input, not as an unavailable translator, so one slow program does not count towards the three that stop the pass. platform.h lets a build set PLAT_CHILD_READ_MS. Not reproduced before the change (no translator hang appears in the available logs). tests/child_timeout_check.py (new) builds the real child and request functions with a 300 ms timeout: a silent child gives -2 and costs one timeout with one child started, an exiting child is restarted once, an answering child gives its line. Every runtime file compiles, with no new warnings in gfx_shader.c and win32.c. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>