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# Copyright (c) Meta Platforms, Inc. and affiliates.
# Copyright (c) 2026, Oracle and/or its affiliates.
# SPDX-License-Identifier: LGPL-2.1-or-later
import os
from pathlib import Path
import re
import signal
from drgn import Object
from drgn.commands import CommandArgumentError
from tests.linux_kernel import fork_and_stop, skip_unless_have_test_kmod
from tests.linux_kernel.crash_commands import CrashCommandTestCase
class TestRunq(CrashCommandTestCase):
def test_no_args(self):
cmd = self.check_crash_command("runq")
self.assertRegex(cmd.stdout, r"CPU \d+ RUNQUEUE [0-9a-f]+")
self.assertIn("CURRENT:", cmd.stdout)
self.assertIn("RT PRIO_ARRAY:", cmd.stdout)
self.assertIn("CFS RB_ROOT:", cmd.stdout)
self.assertIn("PID:", cmd.stdout)
self.assertIn("cpu_rq(", cmd.drgn_option.stdout)
self.assertIn("rq_for_each_rt_task(", cmd.drgn_option.stdout)
self.assertIn("cfs_rq_for_each_entity(", cmd.drgn_option.stdout)
self.assertIsInstance(cmd.drgn_option.globals["curr"], Object)
def test_timestamps(self):
cmd = self.check_crash_command("runq -t")
self.assertRegex(cmd.stdout, r"CPU \d+: \d{16}")
self.assertIn("PID:", cmd.stdout)
self.assertIn("rq.clock", cmd.drgn_option.stdout)
self.assertIn("sched_info.last_arrival", cmd.drgn_option.stdout)
self.assertIsInstance(cmd.drgn_option.globals["rq_clock"], Object)
self.assertIsInstance(cmd.drgn_option.globals["curr"], Object)
self.assertIsInstance(cmd.drgn_option.globals["curr_clock"], Object)
def test_lag(self):
cmd = self.check_crash_command("runq -T")
self.assertRegex(cmd.stdout, r"CPU \d+: \d+\.\d+ secs")
self.assertIsInstance(cmd.drgn_option.globals["rq_clock"], Object)
def test_elapsed(self):
cmd = self.check_crash_command("runq -m")
self.assertRegex(cmd.stdout, r"CPU \d+: \[\s*\d+ \d{2}:\d{2}:\d{2}\.\d{3}\]")
self.assertIn("PID:", cmd.stdout)
self.assertIn("rq.clock", cmd.drgn_option.stdout)
self.assertIn("sched_info.last_arrival", cmd.drgn_option.stdout)
self.assertIsInstance(cmd.drgn_option.globals["rq_clock"], Object)
self.assertIsInstance(cmd.drgn_option.globals["curr"], Object)
self.assertIsInstance(cmd.drgn_option.globals["curr_clock"], Object)
def test_task_groups(self):
cmd = self.check_crash_command("runq -g")
self.assertRegex(cmd.stdout, r"CPU \d+")
self.assertIn("CURRENT:", cmd.stdout)
self.assertIn("ROOT_TASK_GROUP:", cmd.stdout)
self.assertIn("CFS_RQ:", cmd.stdout)
self.assertIn("PID:", cmd.stdout)
self.assertIn("cfs_rq_for_each_entity(", cmd.drgn_option.stdout)
self.assertIn("task_group_name(", cmd.drgn_option.stdout)
def test_cpu(self):
cpu = max(os.sched_getaffinity(0))
cmd = self.check_crash_command(f"runq -c {cpu}")
self.assertIn(f"CPU {cpu}", cmd.stdout)
self.assertEqual(cmd.stdout.count("CURRENT:"), 1)
class TestSig(CrashCommandTestCase):
def _test_sig_drgn_option_common(self, cmd):
for variable in (
"pid",
"command",
"signal_struct",
"nr_threads",
"sigaction",
"handler",
"mask",
"flags",
"blocked",
"private_pending",
"private_pending_signals",
"shared_pending",
"shared_pending_signals",
):
with self.subTest(variable=variable):
self.assertIsInstance(cmd.drgn_option.globals[variable], Object)
for variable in ("cpu", "signo"):
with self.subTest(variable=variable):
self.assertIsInstance(cmd.drgn_option.globals[variable], int)
self.assertIsInstance(cmd.drgn_option.globals["decoded_flags"], str)
def test_sig(self):
with fork_and_stop(
signal.pthread_sigmask, signal.SIG_BLOCK, {signal.SIGUSR1, signal.SIGUSR2}
) as (pid, _):
os.kill(pid, signal.SIGUSR1)
os.kill(pid, signal.SIGUSR2)
sig_status = dict(
re.findall(
r"^(SigBlk|SigPnd|ShdPnd):\s*([0-9a-f]+)",
Path(f"/proc/{pid}/status").read_text(),
flags=re.M,
)
)
cmd = self.check_crash_command(f"sig {pid}")
foreach_cmd = self.check_crash_command(f"foreach {pid} sig", mode="capture")
for c in (cmd, foreach_cmd):
self.assertIn("PID:", c.stdout)
self.assertIn("SIGNAL_STRUCT:", c.stdout)
self.assertIn("NR_THREADS:", c.stdout)
self.assertEqual(
re.search(r"^\s*BLOCKED: ([0-9a-f]+)$", c.stdout, flags=re.M).group(1),
sig_status["SigBlk"],
)
for crash_name, proc_name in (
("PRIVATE_PENDING", "SigPnd"),
("SHARED_PENDING", "ShdPnd"),
):
with self.subTest(set=crash_name):
self.assertEqual(
re.search(
rf"^{crash_name}\n\s*SIGNAL: ([0-9a-f]+)$",
c.stdout,
flags=re.M,
).group(1),
sig_status[proc_name],
)
sigqueue = re.search(
rf"^{crash_name}\n.*\n\s*SIGQUEUE: (.*)", c.stdout, flags=re.M
).group(1)
if sig_status[proc_name].replace("0", ""):
self.assertRegex(sigqueue, r"^\s*SIG\s+SIGINFO\s*$")
else:
self.assertEqual(sigqueue, "(empty)")
self._test_sig_drgn_option_common(cmd)
for variable in ("sigqueue", "info", "pending_signo"):
with self.subTest(variable=variable):
self.assertIsInstance(cmd.drgn_option.globals[variable], Object)
self.assertEqual(cmd.drgn_option.stdout, foreach_cmd.drgn_option.stdout)
def test_thread_group(self):
cmd = self.check_crash_command(f"sig -g {os.getpid()}")
foreach_cmd = self.check_crash_command(
f"foreach {os.getpid()} sig -g", mode="capture"
)
for c in (cmd, foreach_cmd):
self.assertEqual(
len(re.findall(r"^\s*PID:", c.stdout, flags=re.M)),
len(os.listdir("/proc/self/task")) + 1,
)
self.assertIn("for_each_task_in_group(", cmd.drgn_option.stdout)
self._test_sig_drgn_option_common(cmd)
# We may not have any pending signals, so don't check for those variables.
self.assertEqual(cmd.drgn_option.stdout, foreach_cmd.drgn_option.stdout)
def test_list(self):
cmd = self.check_crash_command("sig -l")
self.assertRegex(cmd.stdout, r"(?m)^\s*\[9\] SIGKILL$")
self.assertIn("signal_numbers(", cmd.drgn_option.stdout)
self.assertIsInstance(cmd.drgn_option.globals["number"], int)
self.assertIsInstance(cmd.drgn_option.globals["names"], list)
self.assertIsInstance(cmd.drgn_option.globals["names"][0], str)
def test_sigset(self):
value = (1 << (signal.SIGHUP - 1)) | (1 << (signal.SIGTERM - 1))
cmd = self.check_crash_command(f"sig -s {value:x}")
self.assertEqual(cmd.stdout, "SIGHUP SIGTERM\n")
self.assertIn("decode_sigset(0x", cmd.drgn_option.stdout)
self.assertEqual(cmd.drgn_option.globals["decoded"], "{SIGHUP,SIGTERM}")
class TestWaitq(CrashCommandTestCase):
@skip_unless_have_test_kmod
def test_empty(self):
cmd = self.check_crash_command("waitq drgn_test_empty_waitq")
self.assertIn("is empty", cmd.stdout)
self.assertIn("waitqueue_for_each_task(", cmd.drgn_option.stdout)
@skip_unless_have_test_kmod
def test_non_empty(self):
cmd = self.check_crash_command("waitq drgn_test_waitq")
self.assertIn('COMMAND: "drgn_test_', cmd.stdout)
self.assertIn("waitqueue_for_each_task(", cmd.drgn_option.stdout)
for variable in (
"task",
"pid",
"command",
):
self.assertIsInstance(cmd.drgn_option.globals[variable], Object)
self.assertIsInstance(cmd.drgn_option.globals["cpu"], int)
@skip_unless_have_test_kmod
def test_empty_symbol(self):
address = self.prog.symbol("drgn_test_empty_waitq").address
cmd = self.check_crash_command(f"waitq {address:x}")
self.assertIn("is empty", cmd.stdout)
self.assertIn("waitqueue_for_each_task(", cmd.drgn_option.stdout)
@skip_unless_have_test_kmod
def test_struct(self):
address = self.prog.symbol("drgn_test_waitq_container").address
cmd = self.check_crash_command(
f"waitq drgn_test_waitq_container_struct.waitq {address:x}"
)
self.assertIn("is empty", cmd.stdout)
self.assertIn("waitqueue_for_each_task(", cmd.drgn_option.stdout)
def test_no_arguments(self):
self.assertRaisesRegex(
CommandArgumentError,
"is required",
self.run_crash_command,
"waitq",
)
def test_too_many_arguments(self):
self.assertRaisesRegex(
CommandArgumentError,
"unrecognized",
self.run_crash_command,
"waitq foo.bar abcd1234 baz",
)
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