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+id = 2687
+title = "regression in qtest clock_set/clock_step"
+state = "closed"
+created_at = "2024-11-18T21:37:32.424Z"
+closed_at = "2025-01-13T14:37:33.221Z"
+labels = ["Regression"]
+url = "https://gitlab.com/qemu-project/qemu/-/issues/2687"
+host-os = "Ubunut 24.04"
+host-arch = "x86_64"
+qemu-version = "3428a3894c6fdf43bc07405090699b1de5013cfc"
+guest-os = "N/A"
+guest-arch = "x86_64"
+description = """As of QEMU 9.0 the script included below would increment the time via qtest, but it is now broken and time doesn't seem to be updated. I do note that the QEMU sources use clock_step extensively via qtest_clock_step, but nothing seems to be using the return value so maybe that's why it hasn't been noticed?
+ 
+It seems to have been broken in bc02be4508d8753d1f6071b77d10f4661587df6f which was trying to prevent some deadlock. You can prove that this breaks it by setting a breakpoint in `qemu_virtual_clock_set_ns` -- it never gets called."""
+reproduce = """Run this python script from your QEMU build directory:
+
+```python
+#!/usr/bin/env python3
+
+import subprocess
+import socket
+import typing
+
+qemu_path = "./qemu-system-x86_64"
+
+
+def main():
+    s1, s2 = socket.socketpair()
+
+    qemu = subprocess.Popen(
+        [
+            qemu_path,
+            "-S",
+            "-display",
+            "none",
+            "-chardev", f"socket,id=qtest,fd={s1.fileno()},nodelay=on",
+            "-qtest", "chardev:qtest",
+            "-qtest-log", "/dev/fd/2",
+            "-accel", "qtest",
+        ],
+        pass_fds=[s1.fileno()],
+    )
+
+    try:
+
+        fp = s2.makefile("rw", buffering=1)
+
+        fp.write(f"clock_set 1234\\n")
+        result = fp.readline()[:-1].split(" ")
+        assert result == ["OK", "1234"], f"Unexpected result: {result}"
+    finally:
+        qemu.kill()
+
+
+if __name__ == "__main__":
+    main()
+```"""
+additional = "n/a"