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https://github.com/JakeHillion/drgn.git
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bab4f43d68
Before Linux kernel commit 4e57a4ddf6b0 ("ARM: 9107/1: syscall: always store thread_info->abi_syscall") (in v5.15), on Arm, the syscall number in /proc/<pid>/syscall is unreliable unless the process is being traced. fork_and_sigwait() relies on this to detect when the created process has scheduled out for good. Instead, we can have the created process raise SIGSTOP and wait for it to be stopped. This is simpler and also doesn't require us to care about the sigwait syscall numbers. While we're reworking it, let's also consolidate it with fork_and_call(). test_task_state_to_char() can't use the new function because it wants the function to sleep, then stop, then die, but it's easy enough to open-code that one special case. Signed-off-by: Omar Sandoval <osandov@osandov.com>
138 lines
4.8 KiB
Python
138 lines
4.8 KiB
Python
# Copyright (c) Meta Platforms, Inc. and affiliates.
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# SPDX-License-Identifier: LGPL-2.1-or-later
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import os
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import unittest
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from drgn import Object, Program, reinterpret
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from tests import assertReprPrettyEqualsStr, modifyenv
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from tests.linux_kernel import (
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LinuxKernelTestCase,
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fork_and_stop,
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skip_unless_have_stack_tracing,
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skip_unless_have_test_kmod,
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)
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from util import NORMALIZED_MACHINE_NAME
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@skip_unless_have_stack_tracing
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class LinuxKernelStackTraceTestCase(LinuxKernelTestCase):
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def _test_drgn_test_kthread_trace(self, trace):
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for i, frame in enumerate(trace):
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if frame.name == "drgn_test_kthread_fn3":
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break
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else:
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self.fail("Couldn't find drgn_test_kthread_fn3 frame")
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self.assertEqual(trace[i + 1].name, "drgn_test_kthread_fn2")
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self.assertEqual(trace[i + 2].name, "drgn_test_kthread_fn")
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class TestStackTrace(LinuxKernelStackTraceTestCase):
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@skip_unless_have_test_kmod
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def test_by_task_struct(self):
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self._test_drgn_test_kthread_trace(
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self.prog.stack_trace(self.prog["drgn_test_kthread"])
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)
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def _test_by_pid(self, orc):
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old_orc = int(os.environ.get("DRGN_PREFER_ORC_UNWINDER", "0")) != 0
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with modifyenv({"DRGN_PREFER_ORC_UNWINDER": "1" if orc else "0"}):
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if orc == old_orc:
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prog = self.prog
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else:
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prog = Program()
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prog.set_kernel()
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self._load_debug_info(prog)
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self._test_drgn_test_kthread_trace(
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prog.stack_trace(prog["drgn_test_kthread"].pid)
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)
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@skip_unless_have_test_kmod
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def test_by_pid_dwarf(self):
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self._test_by_pid(False)
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@unittest.skipUnless(
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NORMALIZED_MACHINE_NAME == "x86_64",
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f"{NORMALIZED_MACHINE_NAME} does not use ORC",
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)
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@skip_unless_have_test_kmod
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def test_by_pid_orc(self):
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self._test_by_pid(True)
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@skip_unless_have_test_kmod
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def test_by_pt_regs(self):
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pt_regs = self.prog["drgn_test_kthread_pt_regs"]
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self._test_drgn_test_kthread_trace(self.prog.stack_trace(pt_regs))
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self._test_drgn_test_kthread_trace(self.prog.stack_trace(pt_regs.address_of_()))
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@skip_unless_have_test_kmod
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def test_stack_trace_from_pcs(self):
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if not self.prog["drgn_test_have_stacktrace"]:
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self.skipTest("kernel was not built with CONFIG_STACKTRACE")
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entries = self.prog["drgn_test_stack_entries"]
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self._test_drgn_test_kthread_trace(
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self.prog.stack_trace_from_pcs(
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reinterpret(
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self.prog.array_type(
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entries.type_.type,
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self.prog["drgn_test_num_stack_entries"].value_(),
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),
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entries,
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).value_()
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)
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)
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@skip_unless_have_test_kmod
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def test_local_variable(self):
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for frame in self.prog.stack_trace(self.prog["drgn_test_kthread"]):
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if frame.name == "drgn_test_kthread_fn3":
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break
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else:
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self.fail("Couldn't find drgn_test_kthread_fn3 frame")
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self.assertEqual(frame["a"], 1)
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self.assertEqual(frame["b"], 2)
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self.assertEqual(frame["c"], 3)
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@skip_unless_have_test_kmod
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def test_locals(self):
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task = self.prog["drgn_test_kthread"]
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stack_trace = self.prog.stack_trace(task)
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for frame in stack_trace:
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if frame.name == "drgn_test_kthread_fn3":
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self.assertSetEqual(set(frame.locals()), {"a", "b", "c"})
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break
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else:
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self.fail("Couldn't find drgn_test_kthread_fn3 frame")
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def test_registers(self):
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# Smoke test that we get at least one register and that
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# StackFrame.registers() agrees with StackFrame.register().
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with fork_and_stop() as pid:
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trace = self.prog.stack_trace(pid)
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have_registers = False
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for frame in trace:
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for name, value in frame.registers().items():
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self.assertEqual(frame.register(name), value)
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have_registers = True
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self.assertTrue(have_registers)
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def test_sp(self):
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# Smoke test that the stack pointer register shows up in
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# StackFrame.registers().
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with fork_and_stop() as pid:
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trace = self.prog.stack_trace(pid)
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self.assertIn(trace[0].sp, trace[0].registers().values())
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def test_prog(self):
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self.assertEqual(
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self.prog.stack_trace(Object(self.prog, "struct pt_regs", value={})).prog,
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self.prog,
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)
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def test_stack__repr_pretty_(self):
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with fork_and_stop() as pid:
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trace = self.prog.stack_trace(pid)
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assertReprPrettyEqualsStr(trace)
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for frame in trace:
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assertReprPrettyEqualsStr(frame)
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