all: run strace on each found reproducer

If `strace_bin` is specified, syzkaller will invoke a reproducer with it
and save the output. This should help in debugging.

If syz-manager is attached to a dashboard, upload the strace-powered output
and report.

1 files changed, 18 insertions, 0 deletions

diff --git a/tools/syz-repro/repro.go b/tools/syz-repro/repro.go
index 6622b8203..247cc11cd 100644
--- a/tools/syz-repro/repro.go
+++ b/tools/syz-repro/repro.go
@@ -25,6 +25,7 @@ var (
 	flagDebug  = flag.Bool("debug", false, "print debug output")
 	flagOutput = flag.String("output", filepath.Join(".", "repro.txt"), "output description file (output.txt)")
 	flagCRepro = flag.String("crepro", filepath.Join(".", "repro.c"), "output c file (repro.c)")
+	flagStrace = flag.String("strace", "", "output strace log (strace_bin must be set)")
 )
 
 func main() {
@@ -104,4 +105,21 @@ func main() {
 			log.Logf(0, "failed to write C repro to file: %v", err)
 		}
 	}
+	if *flagStrace != "" {
+		result := repro.RunStrace(res, cfg, reporter, vmPool, vmIndexes[0])
+		if result.Error != nil {
+			log.Logf(0, "failed to run strace: %v", result.Error)
+		} else {
+			if result.Report != nil {
+				log.Logf(0, "under strace repro crashed with title: %s", result.Report.Title)
+			} else {
+				log.Logf(0, "repro didn't crash under strace")
+			}
+			if err := osutil.WriteFile(*flagStrace, result.Output); err == nil {
+				fmt.Printf("C file saved to %s\n", *flagStrace)
+			} else {
+				log.Logf(0, "failed to write strace output to file: %v", err)
+			}
+		}
+	}
 }