Troubleshooting Linux Kernel Modules And Device Drivers

Troubleshooting Linux Kernel Modules and Device Drivers Mike Anderson Chief Scientist The PTR Group, Inc. [email_address] Source: www.crobike.de

What We’ll Talk About ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Challenges of Kernel Debugging ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Device Drivers/Kernel Modules ,[object Object],[object Object],[object Object],[object Object],[object Object]

Example Module ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

When Things go Wrong… ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Source: picasaweb.google.com

Kernel Panic ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Source: regmedia.co.uk

Sample Panic Output ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Kernel oops ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Example Oops ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Example Oops part 2 ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Enabling Symbolic Kernel Output

Module Debugging Techniques ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Using strace to Watch System Calls ,[object Object],[object Object],[object Object],[object Object]

Using strace to Watch System Calls #2 ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Example strace Output ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Debugging with printk ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Debugging with printk #2 ,[object Object],[object Object],[object Object]

Debugging with printk #3 ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Debugging with printk #4 ,[object Object],[object Object],[object Object],[object Object]

Using the /proc File System ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Techniques for Source Debugging ,[object Object],[object Object],[object Object],[object Object],[object Object]

Compiling the Kernel with Debug Info ,[object Object],[object Object],[object Object],[object Object],[object Object]

Enabling Debugging in the Kernel

Kernel gdb (kgdb) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Kgdb Light in 2.6.26-rc8 ,[object Object]

kgdb Lash up ,[object Object],[object Object],[object Object],Host Target Network Ethernet RS-232

Hardware-assisted Debugging ,[object Object],[object Object],[object Object],[object Object]

Debugging with LEDs ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Debugging with LEDs, Caveats ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Hardware Debuggers ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Debugging with a JTAG Probe ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Example JTAG Usage ,[object Object],[object Object],[object Object],[object Object],[object Object]

Summary ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Troubleshooting Linux Kernel Modules And Device Drivers

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