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# Copyright (c) Meta Platforms, Inc. and affiliates.
# SPDX-License-Identifier: LGPL-2.1-or-later
import contextlib
import ctypes
import gzip
import mmap
import os
from pathlib import Path
import re
import unittest
from _drgn_util.platform import NORMALIZED_MACHINE_NAME
from drgn import Object, Symbol
from tests.linux_kernel import (
IOCB_CMD_PREAD,
IOCB_CMD_PWRITE,
io_destroy,
io_setup,
io_submit,
iocb,
possible_cpus,
skip_unless_have_test_kmod,
)
from tests.linux_kernel.crash_commands import CrashCommandTestCase
from tests.linux_kernel.helpers.test_irq import proc_irq_smp_affinity_list
class TestSys(CrashCommandTestCase):
def test_sys(self):
cmd = self.check_crash_command("sys")
for field in (
"KERNEL",
"DUMPFILE",
"CPUS",
"DATE",
"UPTIME",
"LOAD AVERAGE",
"TASKS",
"NODENAME",
"RELEASE",
"VERSION",
"MACHINE",
"MEMORY",
):
self.assertRegex(cmd.stdout, rf"(?m)^\s*{field}:")
for variable in (
"kernel",
"taints",
"dumpfile",
"cpus",
"offline_cpus",
"timestamp",
"uptime_",
"load_average",
"num_tasks",
"nodename",
"release",
"version",
"machine",
"memory",
):
self.assertIn(variable, cmd.drgn_option.globals)
def test_sys_config(self):
try:
with gzip.open("/proc/config.gz", "rt") as f:
expected = f.read()
except FileNotFoundError:
self.skipTest("kernel not built with CONFIG_IKCONFIG_PROC")
cmd = self.check_crash_command("sys config")
self.assertEqual(cmd.stdout, expected)
self.assertIn("kconfig", cmd.drgn_option.globals)
class TestDev(CrashCommandTestCase):
def test_no_args(self):
cmd = self.check_crash_command("dev")
with open("/proc/devices", "r") as f:
for line in f:
if line.isspace() or line in (
"Character devices:\n",
"Block devices:\n",
):
continue
match = re.fullmatch(r"\s*([0-9]+)\s+(.*)\n", line)
self.assertRegex(
cmd.stdout, rf"(?m)^\s*{match.group(1)}\s+{match.group(2)}"
)
for variable in ("cdev", "operations", "disk"):
with self.subTest(variable=variable):
self.assertIsInstance(cmd.drgn_option.globals[variable], Object)
self.assertIn("major", cmd.drgn_option.globals)
def test_ioports(self):
cmd = self.check_crash_command("dev -i")
lines = iter(cmd.stdout.splitlines())
# Skip the header and root resource.
next(lines)
next(lines)
with open("/proc/ioports", "r") as f:
for output_line, file_line in zip(lines, f):
output_match = re.fullmatch(
r"\s*[0-9a-f]+\s+([0-9a-f]+)-([0-9a-f]+)\s+(.*)", output_line
)
file_match = re.fullmatch(
r"\s*([0-9a-f]+)-([0-9a-f]+)\s*:\s*(.*)\n", file_line
)
self.assertEqual(
(
int(output_match.group(1), 16),
int(output_match.group(2), 16),
output_match.group(3),
),
(
int(file_match.group(1), 16),
int(file_match.group(2), 16),
file_match.group(3),
),
)
for variable in ("resource", "start", "end", "name"):
with self.subTest(variable=variable):
self.assertIsInstance(cmd.drgn_option.globals[variable], Object)
def test_pci(self):
cmd = self.check_crash_command("dev -p")
for path in Path("/sys/bus/pci/devices").iterdir():
self.assertIn(path.name, cmd.stdout)
self.assertIsInstance(cmd.drgn_option.globals["root_bus"], Object)
self.assertIsInstance(cmd.drgn_option.globals["busname"], str)
# Everything else is a local variable in a recursive function.
@skip_unless_have_test_kmod
def test_disks(self):
cmd_d_while_idle = self.check_crash_command("dev -d", mode="capture")
cmd_D_while_idle = self.check_crash_command("dev -D", mode="capture")
with contextlib.ExitStack() as exit_stack:
fd = os.open("/dev/drgntestb0", os.O_RDWR | os.O_DIRECT)
exit_stack.callback(os.close, fd)
major = os.major(os.fstat(fd).st_rdev)
map = exit_stack.enter_context(
mmap.mmap(-1, 2 * mmap.PAGESIZE, mmap.MAP_PRIVATE)
)
iocbs = (iocb * 2)()
iocbs[0].aio_lio_opcode = IOCB_CMD_PWRITE
iocbs[0].aio_fildes = fd
iocbs[0].aio_buf = ctypes.addressof(ctypes.c_char.from_buffer(map))
iocbs[0].aio_nbytes = mmap.PAGESIZE
iocbs[0].aio_offset = mmap.PAGESIZE
iocbs[1].aio_lio_opcode = IOCB_CMD_PREAD
iocbs[1].aio_fildes = fd
iocbs[1].aio_buf = ctypes.addressof(
ctypes.c_char.from_buffer(map, mmap.PAGESIZE)
)
iocbs[1].aio_nbytes = mmap.PAGESIZE
iocbs[1].aio_offset = 3 * mmap.PAGESIZE
ctx_id = io_setup(len(iocbs))
exit_stack.callback(io_destroy, ctx_id)
truant = Path("/sys/block/drgntestb0/truant")
truant.write_text("1\n")
exit_stack.callback(truant.write_text, "0\n")
io_submit(ctx_id, iocbs)
cmd_d_while_busy = self.check_crash_command("dev -d")
cmd_D_while_busy = self.check_crash_command("dev -D", mode="capture")
self.assertIn("drgntestb0", cmd_d_while_idle.stdout)
self.assertNotIn("drgntestb0", cmd_D_while_idle.stdout)
for cmd in (cmd_d_while_busy, cmd_D_while_busy):
self.assertRegex(
cmd.stdout,
rf"(?m)^\s*{major}\s+[0-9a-f]+\s+drgntestb0\s+[0-9a-f]+\s+2\s+1\s+1\s*$",
)
for cmd in (cmd_d_while_idle, cmd_D_while_idle, cmd_D_while_busy):
self.assertEqual(
cmd.drgn_option.stdout, cmd_d_while_busy.drgn_option.stdout
)
cmd = cmd_d_while_busy
for variable in ("disk", "major", "queue"):
with self.subTest(variable=variable):
self.assertIsInstance(cmd.drgn_option.globals[variable], Object)
self.assertIsInstance(cmd.drgn_option.globals["name"], bytes)
for variable in ("read", "write", "total"):
with self.subTest(variable=variable):
self.assertIsInstance(cmd.drgn_option.globals[variable], int)
def nr_irqs():
with open("/proc/stat", "r") as f:
for line in f:
if line.startswith("intr "):
return len(line.split()) - 2
def nr_softirqs():
with open("/proc/stat", "r") as f:
for line in f:
if line.startswith("softirq "):
return len(line.split()) - 2
class TestIrq(CrashCommandTestCase):
def _test_irq_common(self, cmd):
for path in Path("/sys/kernel/irq").iterdir():
expected = (path / "actions").read_text().rstrip("\n")
if expected:
irq = int(path.name)
break
else:
self.skipTest("IRQ with action not found")
action = expected.partition(",")[0]
self.assertRegex(cmd.stdout, rf'(?m)^\s*{irq}.*"{re.escape(action)}"')
self.assertIn("for_each_irq_desc()", cmd.drgn_option.stdout)
self.assertIsInstance(cmd.drgn_option.globals["irq"], int)
for variable in ("irq_desc", "action", "name"):
with self.subTest(variable=variable):
self.assertIsInstance(cmd.drgn_option.globals[variable], Object)
def test_irq(self):
cmd = self.check_crash_command("irq")
irqs = [int(x) for x in re.findall(r"^\s*([0-9]+)", cmd.stdout, flags=re.M)]
self.assertEqual(irqs, list(range(nr_irqs())))
self._test_irq_common(cmd)
def test_used(self):
cmd = self.check_crash_command("irq -u")
irqs = [int(x) for x in re.findall(r"^\s*([0-9]+)", cmd.stdout, flags=re.M)]
expected = [int(path.name) for path in Path("/sys/kernel/irq").iterdir()]
expected.sort()
self.assertEqual(irqs, expected)
self._test_irq_common(cmd)
def test_number(self):
numbers = []
for path in Path("/sys/kernel/irq").iterdir():
numbers.append(int(path.name))
if len(numbers) >= 2:
break
numbers.reverse()
cmd = self.check_crash_command(f"irq {' '.join([str(x) for x in numbers])}")
irqs = [int(x) for x in re.findall(r"^\s*([0-9]+)", cmd.stdout, flags=re.M)]
self.assertEqual(irqs, numbers)
self.assertIn("irq_to_desc(", cmd.drgn_option.stdout)
self.assertIsInstance(cmd.drgn_option.globals["irq"], int)
# Omit "name" since the IRQs we chose may not have any actions with
# names.
for variable in ("irq_desc", "action"):
with self.subTest(variable=variable):
self.assertIsInstance(cmd.drgn_option.globals[variable], Object)
def test_invalid_number(self):
number = nr_irqs()
# The drgn code would fault on a NULL irq_desc, so just compile it.
cmd = self.check_crash_command(f"irq {number}", mode="compile")
self.assertEqual(cmd.stdout, f"irq: invalid IRQ number: {number}\n")
@unittest.skipUnless(NORMALIZED_MACHINE_NAME == "x86_64", "machine is not x86_64")
def test_idt(self):
cmd = self.check_crash_command("irq -d")
vecs = [int(x) for x in re.findall(r"^\s*\[([0-9]+)\]", cmd.stdout, flags=re.M)]
self.assertEqual(vecs, list(range(256)))
self.assertRegex(cmd.stdout, r"(?m)^\s*\[3\] .*int3")
self.assertIsInstance(cmd.drgn_option.globals["vec"], int)
for variable in ("gate", "func"):
with self.subTest(variable=variable):
self.assertIsInstance(cmd.drgn_option.globals[variable], Object)
self.assertIsInstance(cmd.drgn_option.globals["sym"], Symbol)
def test_softirqs(self):
cmd = self.check_crash_command("irq -b")
vecs = [int(x) for x in re.findall(r"^\s*\[([0-9]+)\]", cmd.stdout, flags=re.M)]
self.assertEqual(vecs, list(range(nr_softirqs())))
self.assertRegex(cmd.stdout, r"(?m)^\s*\[[0-9]+\] .*<\w+\>\s*$")
self.assertIsInstance(cmd.drgn_option.globals["vec"], int)
self.assertIsInstance(cmd.drgn_option.globals["action"], Object)
self.assertIsInstance(cmd.drgn_option.globals["sym"], Symbol)
def test_affinity(self):
cmd = self.check_crash_command("irq -a")
proc_path = Path("/proc/irq")
expected = [
(
int(path.name),
proc_irq_smp_affinity_list(proc_path / path.name).rstrip("\n"),
)
for path in Path("/sys/kernel/irq").iterdir()
if (path / "actions").read_text().rstrip("\n")
]
expected.sort()
actual = [
(int(irq), affinity)
for irq, affinity in re.findall(
r"^\s*([0-9]+).*\s(\S+)\s*$", cmd.stdout, flags=re.M
)
]
self.assertEqual(actual, expected)
self.assertIsInstance(cmd.drgn_option.globals["irq"], int)
for variable in ("irq_desc", "affinity"):
with self.subTest(variable=variable):
self.assertIsInstance(cmd.drgn_option.globals[variable], Object)
self.assertIsInstance(cmd.drgn_option.globals["names"], list)
self.assertIsInstance(cmd.drgn_option.globals["affinity_list"], str)
def test_stats(self):
cmd = self.check_crash_command("irq -s")
expected = [
int(path.name)
for path in Path("/sys/kernel/irq").iterdir()
if (path / "actions").read_text().rstrip("\n")
]
expected.sort()
num_possible_cpus = len(possible_cpus())
actual = [
int(irq)
for irq in re.findall(
rf"^\s*([0-9]+):(?:\s+[0-9]+){{{num_possible_cpus}}}",
cmd.stdout,
flags=re.M,
)
]
self.assertEqual(actual, expected)
self.assertIsInstance(cmd.drgn_option.globals["irq"], int)
self.assertIsInstance(cmd.drgn_option.globals["irq_desc"], Object)
self.assertIsInstance(cmd.drgn_option.globals["names"], list)
self.assertIn("chip_name", cmd.drgn_option.globals)
self.assertIsInstance(cmd.drgn_option.globals["count"], int)
def test_stats_cpu(self):
cpu = max(possible_cpus())
cmd = self.check_crash_command(f"irq -s -c {cpu}")
expected = [
int(path.name)
for path in Path("/sys/kernel/irq").iterdir()
if (path / "actions").read_text().rstrip("\n")
]
expected.sort()
actual = [
int(irq)
for irq in re.findall(r"^\s*([0-9]+):\s+[0-9]+", cmd.stdout, flags=re.M)
]
self.assertEqual(actual, expected)
self.assertEqual(cmd.drgn_option.globals["cpu"], cpu)
self.assertIsInstance(cmd.drgn_option.globals["irq"], int)
self.assertIsInstance(cmd.drgn_option.globals["irq_desc"], Object)
self.assertIsInstance(cmd.drgn_option.globals["names"], list)
self.assertIn("chip_name", cmd.drgn_option.globals)
self.assertIsInstance(cmd.drgn_option.globals["count"], int)
class TestLog(CrashCommandTestCase):
def test_no_args(self):
cmd = self.check_crash_command("log")
self.assertRegex(cmd.stdout, r"^\[\s*[0-9]+\.[0-9]+\] .")
self.assertIn("get_dmesg()", cmd.drgn_option.stdout)
self.assertIsInstance(cmd.drgn_option.globals["dmesg"], bytes)
def test_t(self):
cmd = self.check_crash_command("log -t")
self.assertRegex(cmd.stdout, r"^[^[]")
self.assertIn("get_dmesg(timestamps=False)", cmd.drgn_option.stdout)
self.assertIsInstance(cmd.drgn_option.globals["dmesg"], bytes)
def test_T(self):
cmd = self.check_crash_command("log -T")
self.assertRegex(cmd.stdout, r"^\[[A-Z]")
self.assertIn('get_dmesg(timestamps="human")', cmd.drgn_option.stdout)
self.assertIsInstance(cmd.drgn_option.globals["dmesg"], bytes)
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