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4a9210e1ecLoops `systemctl daemon-reexec` inside a systemd-nspawn test container and asserts the in-container D-Bus stays usable afterwards. On affected systemd under nspawn, one of the re-execs wedges PID 1 (it never finishes re-initialising after the re-exec), and every later `systemctl` call hangs or returns 'Transport endpoint is not connected'. The identical loop on a QEMU node survives indefinitely, so the test is nspawn-specific. Assisted-by: Claude:claude-opus-4-8
79 lines
2.9 KiB
Nix
79 lines
2.9 KiB
Nix
# Regression test for an nspawn-only systemd re-exec failure that broke D-Bus.
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#
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# Demonstrates `systemctl show` keeps working on `daemon-reexec`.
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#
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# Trigger: `systemctl daemon-reexec` issues a D-Bus `Manager.Reexecute`, like
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# `switch-to-configuration-ng` on a systemd package change.
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#
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# Root cause: inside nspawn test containers PID 1 re-send `READY=1` on the
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# `NOTIFY_SOCKET` on re-exec. The test driver stopped draining that socket
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# after boot, so until drained its receive buffer filled and `systemctl` hung /
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# errored `Failed to connect to bus: Transport endpoint is not connected`.
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{ ... }:
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{
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name = "nspawn-daemon-reexec-dbus";
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# `containers.<name>` => systemd-nspawn machine (vs `nodes.<name>` => QEMU).
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# An empty container boots full systemd + D-Bus, which is all we need.
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containers.machine = { };
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testScript = # python
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''
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import re
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BUS_BROKEN = re.compile(
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r"Transport endpoint is not connected|Failed to connect to bus"
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)
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# Without the fix the notify socket's receive buffer fills after 10
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# undrained `READY=1` resends, so PID 1 blocks then.
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REEXECS = 10
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def bus_broken():
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"""Whether the in-container D-Bus is unusable. A broken bus prints a
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transport error or hangs until `timeout` kills it (status 124); both
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count as broken."""
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status, out = machine.execute(
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"timeout 10 systemctl show -p ActiveState --value "
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"multi-user.target 2>&1",
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check_return=False,
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timeout=20,
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)
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return status != 0 or bool(BUS_BROKEN.search(out)), status, out
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machine.start()
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machine.wait_for_unit("multi-user.target", timeout=120)
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# Pre-reexec sanity: the bus works and shows no break.
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broken, status, out = bus_broken()
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assert not broken, (
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f"bus already broken before any reexec: status={status} out={out!r}"
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)
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machine.log(f"pre-reexec sanity OK: {out.strip()!r}")
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broke_at = None
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for i in range(1, REEXECS + 1):
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# The same D-Bus Manager.Reexecute that switch-to-configuration issues
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# on a systemd change.
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machine.execute(
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"timeout 30 systemctl daemon-reexec",
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check_return=False,
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timeout=45,
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)
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broken, status, out = bus_broken()
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machine.log(f"[reexec {i}] status={status} out={out.strip()!r}")
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if broken:
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broke_at = i
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break
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assert broke_at is None, (
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f"nspawn D-Bus broke after daemon-reexec #{broke_at} of {REEXECS} "
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"(systemctl hung or returned a bus transport error). The re-exec'd "
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"PID 1 never finished re-initialising -- the test driver stopped "
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"draining the notify socket, so PID 1's READY=1 resend blocked. "
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"Never observed on QEMU."
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)
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'';
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}
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