Changes between Version 5 and Version 6 of troubleshooting

Timestamp:

01/27/2021 09:17:11 PM (3 years ago)

Author:

Tim Harvey

Comment:

add initcall debug

troubleshooting

@@ -85 +85 @@
 * [https://www.kernel.org/doc/ols/2009/ols2009-pages-39-46.pdf Dynamic Debug by Jason Baron of Red Hat (2009)]
 
+[=#initcall]
+=== debugging kernel hangs by enabling initcall_debug
+If you are troubleshooting a kernel hang it is usually best to pass {{{initcall_debug}}} to the kernel cmdline which will show you driver init calls entering and returning. If you see a driver enter init but not return, you know what driver is causing the hang.
+
+
 == Early Serial Debug ==
 Typically the serial drivers don't get initialized until after some of the more critical components. This can result in any kernel crash/hang not reporting anything from the serial console after {{{'Starting kernel ....'}}}