pkg/report: consider on_each_cpu as stall anchor function

Kernel frequently hangs in on_each_cpu,
it seems to be more indicative of the root cause
than subsequent frames.

1 files changed, 8 insertions, 0 deletions

diff --git a/pkg/report/linux.go b/pkg/report/linux.go
index b24d9ae42..d66350bd2 100644
--- a/pkg/report/linux.go
+++ b/pkg/report/linux.go
@@ -590,6 +590,13 @@ func linuxStallFrameExtractor(frames []string) (string, string) {
 	prev := frames[0]
 	for _, frame := range frames {
 		if matchesAny([]byte(frame), linuxStallAnchorFrames) {
+			if strings.HasPrefix(frame, "on_each_cpu") {
+				// In this case we want this function rather than the previous one
+				// (there can be several variations on the next one).
+				// This one can also be called "on_each_cpu_cond",
+				// normalize it to "on_each_cpu".
+				prev = "on_each_cpu"
+			}
 			for _, prefix := range []string{
 				"__x64_",
 				"SYSC_",
@@ -716,6 +723,7 @@ var linuxStallAnchorFrames = []*regexp.Regexp{
 	compile("__fput"),
 	compile("task_work_run"),
 	compile("exit_to_usermode"),
+	compile("on_each_cpu"),
 }
 
 // nolint: lll