system(3) breaks stdin from the terminal

Any call to system(3) causes stdin to always return EOF, not just in the calling program, but any program reading from stdin in cooked/normal/nocbreak mode. The problem persists even after running reset(1).

This only happens if /bin/sh points to /bin/Shell. Using ln -sf /bin/bash mnt/bin/sh in sync-local.sh solves the problem.

This also somehow causes sys.stdin.readline to hang in Python after hitting enter.

19128-new.c

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Last tested 2026-07-17 amd64, aarch64 with GNU toolchain on Debian 13 host