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#!/bin/bash
#
# SPDX-FileCopyrightText: 2017 Francis Deslauriers <francis.deslauriers@efficios.com>
#
# SPDX-License-Identifier: GPL-2.0-only
#
TEST_DESC="Kernel tracer - Callstack context"
CURDIR=$(dirname "$0")/
TESTDIR=$CURDIR/../..
NUM_TESTS=14
TEST_APP_USERSPACE="$TESTDIR/utils/testapp/gen-syscall-events-callstack/gen-syscall-events-callstack"
TEST_APP_KERNELSPACE="$TESTDIR/utils/testapp/gen-syscall-events/gen-syscall-events"
PARSE_CALLSTACK="$TESTDIR/utils/parse-callstack.py"
SESSION_NAME="callstack"
CHANNEL_NAME="chan0"
source "$TESTDIR/utils/utils.sh"
function lttng_untrack_all()
{
lttng_untrack 0 "-s $SESSION_NAME --all --pid -k"
}
function lttng_track_pid()
{
local PID=$1
lttng_track 0 "-s $SESSION_NAME -k --pid=$PID"
}
function run_workload()
{
local TEST_APP=$1
# shift the first argument, passing along the other args if any to the
# test app.
shift
local start_file_sync=$(mktemp -u -t "tmp.${FUNCNAME[0]}_sync_before_first.XXXXXX")
lttng_untrack_all
./"$TEST_APP" "$start_file_sync" "$@" &
PID=$!
lttng_track_pid $PID
start_lttng_tracing_ok
# Create start file to launch the execution of the syscall call by the
# test app.
touch "$start_file_sync"
wait $PID
stop_lttng_tracing_ok
# Clean up the synchronization file.
rm -f "$start_file_sync"
}
function test_user_callstack()
{
TRACE_PATH=$(mktemp -d -t "tmp.${FUNCNAME[0]}_trace_path.XXXXXX")
# This is the expected userspace callstack. (see gen-syscall-events-callstack.c)
USER_CS_EXPECTED="main fct_a fct_b fct_c my_gettid"
EVENT_NAME="gettid"
diag "Userspace callstack test"
create_lttng_session_ok $SESSION_NAME "$TRACE_PATH"
lttng_enable_kernel_channel_ok "$SESSION_NAME" "$CHANNEL_NAME"
lttng_enable_kernel_syscall_ok "$SESSION_NAME" "$EVENT_NAME" "$CHANNEL_NAME"
add_context_kernel_ok "$SESSION_NAME" "$CHANNEL_NAME" "callstack-user"
run_workload $TEST_APP_USERSPACE
destroy_lttng_session_ok "$SESSION_NAME"
"_run_babeltrace_cmd" "$TRACE_PATH" | grep $EVENT_NAME | ./"$PARSE_CALLSTACK" --user "$TEST_APP_USERSPACE" $USER_CS_EXPECTED
ok $? "Validate userspace callstack"
rm -rf "$TRACE_PATH"
}
function test_kernel_callstack()
{
TRACE_PATH=$(mktemp -d -t "tmp.${FUNCNAME[0]}_trace_path.XXXXXX")
# Those are symbol expected to be present in the kernel callstack. This
# is not an exhaustive list since it's kernel dependent.
# FIXME: we used to test for the following symbols as well:
# save_stack_trace, lttng_callstack_get_size, but they were removed
# because:
# 1. kernel commit 77072f09 make it so that save_stack_trace is
# omitted from the callstack itself, and
#
# 2. the code (of this commit) can trigger Tail Call Optimization
# which mess up with the stacktrace by omiting the wrong address
# from the stacktrace.
# When this is fixed, we should add both save_stack_trace and
# lttng_callstack_get_size symbols back in the list of expected
# addresses.
KERNEL_CS_EXPECTED="lttng_event_reserve"
EVENT_NAME="read"
diag "Kernel callstack test"
create_lttng_session_ok $SESSION_NAME "$TRACE_PATH"
lttng_enable_kernel_channel_ok "$SESSION_NAME" "$CHANNEL_NAME"
lttng_enable_kernel_syscall_ok "$SESSION_NAME" "$EVENT_NAME" "$CHANNEL_NAME"
add_context_kernel_ok "$SESSION_NAME" "$CHANNEL_NAME" "callstack-kernel"
run_workload "$TEST_APP_KERNELSPACE" "/proc/cpuinfo" "/proc/cmdline"
destroy_lttng_session_ok "$SESSION_NAME"
"_run_babeltrace_cmd" "$TRACE_PATH" | grep $EVENT_NAME | ./"$PARSE_CALLSTACK" --kernel $KERNEL_CS_EXPECTED
ok $? "Validate kernel callstack"
rm -rf "$TRACE_PATH"
}
# Only run userspace callstack test on x86 (32 and 64 variants)
uname -m | grep "86" >/dev/null 2>&1
if test $? == 0; then
NUM_TESTS=$((NUM_TESTS+10))
RUN_USERSPACE_TEST=1
else
RUN_USERSPACE_TEST=0
fi
# MUST set TESTDIR before calling those functions
plan_tests $NUM_TESTS
print_test_banner "$TEST_DESC"
bail_out_if_no_babeltrace
check_skip_kernel_test "$NUM_TESTS" "Skipping all tests." ||
{
lttng_modules_loaded_fail
validate_lttng_modules_present
start_lttng_sessiond
if test $RUN_USERSPACE_TEST == 1; then
test_user_callstack
fi
test_kernel_callstack
stop_lttng_sessiond
lttng_modules_loaded_fail
}
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