Thanks for helping to track down this bug. Since the problem occurs only
with a few Linux kernel versions and affects Emacs only when doing CPU
profiling, it doesn't seem worth spending time to try to patch Emacs to
work around the bug. So I installed the attached patch into emacs-26's
etc/PROBLEMS file to warn users about the problem, and am closing the
Emacs bug report.
>From 1243188bc4f722abf16518bf73924ce5f17750cf Mon Sep 17 00:00:00 2001
From: Paul Eggert <egg...@cs.ucla.edu>
Date: Fri, 1 Feb 2019 17:58:05 -0800
Subject: [PATCH] * etc/PROBLEMS: Mention profiler-report bug (Bug#34235).
---
etc/PROBLEMS | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/etc/PROBLEMS b/etc/PROBLEMS
index cab087631c..00583f016d 100644
--- a/etc/PROBLEMS
+++ b/etc/PROBLEMS
@@ -1850,6 +1850,12 @@ term/xterm.el) for more details.
** GNU/Linux
+*** GNU/Linux: profiler-report outputs nothing.
+
+A few versions of the Linux kernel have timer bugs that break CPU
+profiling; see Bug#34235. To fix the problem, upgrade to kernel
+versions 4.19.19 or 4.20.6, or later.
+
*** GNU/Linux: Process output is corrupted.
There is a bug in Linux kernel 2.6.10 PTYs that can cause emacs to
--
2.20.1
