On Mon, 2010-04-05 at 16:26 +0200, Michal Simek wrote:Steven J. Magnani wrote:The Microblaze dynamic ftrace code assumes a call ordering that is not metI would like to replicate this problem to see that there is. I am not able to reach this fault
in all scenarios. Specifically, executing a command similar to:
echo 105 > /sys/kernel/debug/tracing/set_ftrace_pid
before any other tracing-related commands results in a kernel panic:
BUG: failure at arch/microblaze/kernel/ftrace.c:198/ftrace_update_ftrace_func()!
Recoding ftrace_update_ftrace_func() to use &ftrace_caller directly eliminates the need to capture its address elsewhere (and thus rely on a particular call sequence).
Please copy & paste log with your commands.
# echo 80 > /sys/kernel/debug/tracing/set_ftrace_pid
BUG: failure at
Kernel panic - not syncing: BUG!