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perf test: Handle perftool-testsuite_probe failure due to broken DWARF

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Test case test_adding_blacklisted ends in failure if the blacklisted
probe is of an assembler function with no DWARF available. At the same
time, probing the blacklisted function with ASM DWARF doesn't test the
blacklist itself as the failure is a result of the broken DWARF.

When the broken DWARF output is encountered, check if the probed
function was compiled by the assembler. If so, the broken DWARF message
is expected and does not report a perf issue, else report a failure.  If
the ASM DWARF affected the probe, try the next probe on the blacklist.
If the first 5 probes are defective due to broken DWARF, skip the test
case.

Fixes: def5480d63 ("perf testsuite probe: Add test for blacklisted kprobes handling")
Signed-off-by: Veronika Molnarova <vmolnaro@redhat.com>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Ian Rogers <irogers@google.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Kan Liang <kan.liang@linux.intel.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Michael Petlan <mpetlan@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Veronika Molnarova <vmolnaro@redhat.com>
Link: https://lore.kernel.org/r/20241017161555.236769-1-vmolnaro@redhat.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Veronika Molnarova 2024-10-17 18:15:55 +02:00 committed by Arnaldo Carvalho de Melo
parent d822ca29a4
commit 06a130e42a
1 changed files with 52 additions and 13 deletions
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65
tools/perf/tests/shell/base_probe/test_adding_blacklisted.sh
View file

@ -19,35 +19,74 @@
TEST_RESULT=0
# skip if not supported
BLACKFUNC=`head -n 1 /sys/kernel/debug/kprobes/blacklist 2> /dev/null | cut -f2`
if [ -z "$BLACKFUNC" ]; then
BLACKFUNC_LIST=`head -n 5 /sys/kernel/debug/kprobes/blacklist 2> /dev/null | cut -f2`
if [ -z "$BLACKFUNC_LIST" ]; then
print_overall_skipped
exit 0
fi
# try to find vmlinux with DWARF debug info
VMLINUX_FILE=$(perf probe -v random_probe |& grep "Using.*for symbols" | sed -r 's/^Using (.*) for symbols$/\1/')
# remove all previously added probes
clear_all_probes
### adding blacklisted function
# functions from blacklist should be skipped by perf probe
! $CMD_PERF probe $BLACKFUNC > $LOGS_DIR/adding_blacklisted.log 2> $LOGS_DIR/adding_blacklisted.err
PERF_EXIT_CODE=$?
REGEX_SCOPE_FAIL="Failed to find scope of probe point"
REGEX_SKIP_MESSAGE=" is blacklisted function, skip it\."
REGEX_NOT_FOUND_MESSAGE="Probe point \'$BLACKFUNC\' not found."
REGEX_NOT_FOUND_MESSAGE="Probe point \'$RE_EVENT\' not found."
REGEX_ERROR_MESSAGE="Error: Failed to add events."
REGEX_INVALID_ARGUMENT="Failed to write event: Invalid argument"
REGEX_SYMBOL_FAIL="Failed to find symbol at $RE_ADDRESS"
REGEX_OUT_SECTION="$BLACKFUNC is out of \.\w+, skip it"
../common/check_all_lines_matched.pl "$REGEX_SKIP_MESSAGE" "$REGEX_NOT_FOUND_MESSAGE" "$REGEX_ERROR_MESSAGE" "$REGEX_SCOPE_FAIL" "$REGEX_INVALID_ARGUMENT" "$REGEX_SYMBOL_FAIL" "$REGEX_OUT_SECTION" < $LOGS_DIR/adding_blacklisted.err
CHECK_EXIT_CODE=$?
REGEX_OUT_SECTION="$RE_EVENT is out of \.\w+, skip it"
REGEX_MISSING_DECL_LINE="A function DIE doesn't have decl_line. Maybe broken DWARF?"
print_results $PERF_EXIT_CODE $CHECK_EXIT_CODE "adding blacklisted function $BLACKFUNC"
(( TEST_RESULT += $? ))
BLACKFUNC=""
SKIP_DWARF=0
for BLACKFUNC in $BLACKFUNC_LIST; do
echo "Probing $BLACKFUNC"
# functions from blacklist should be skipped by perf probe
! $CMD_PERF probe $BLACKFUNC > $LOGS_DIR/adding_blacklisted.log 2> $LOGS_DIR/adding_blacklisted.err
PERF_EXIT_CODE=$?
# check for bad DWARF polluting the result
../common/check_all_patterns_found.pl "$REGEX_MISSING_DECL_LINE" >/dev/null < $LOGS_DIR/adding_blacklisted.err
if [ $? -eq 0 ]; then
SKIP_DWARF=1
echo "Result polluted by broken DWARF, trying another probe"
# confirm that the broken DWARF comes from assembler
if [ -n "$VMLINUX_FILE" ]; then
readelf -wi "$VMLINUX_FILE" |
awk -v probe="$BLACKFUNC" '/DW_AT_language/ { comp_lang = $0 }
$0 ~ probe { if (comp_lang) { print comp_lang }; exit }' |
grep -q "MIPS assembler"
CHECK_EXIT_CODE=$?
if [ $CHECK_EXIT_CODE -ne 0 ]; then
SKIP_DWARF=0 # broken DWARF while available
break
fi
fi
else
../common/check_all_lines_matched.pl "$REGEX_SKIP_MESSAGE" "$REGEX_NOT_FOUND_MESSAGE" "$REGEX_ERROR_MESSAGE" "$REGEX_SCOPE_FAIL" "$REGEX_INVALID_ARGUMENT" "$REGEX_SYMBOL_FAIL" "$REGEX_OUT_SECTION" < $LOGS_DIR/adding_blacklisted.err
CHECK_EXIT_CODE=$?
SKIP_DWARF=0
break
fi
done
if [ $SKIP_DWARF -eq 1 ]; then
print_testcase_skipped "adding blacklisted function $BLACKFUNC"
else
print_results $PERF_EXIT_CODE $CHECK_EXIT_CODE "adding blacklisted function $BLACKFUNC"
(( TEST_RESULT += $? ))
fi
### listing not-added probe