lkml.org 
[lkml]   [2010]   [Apr]   [6]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH] microblaze: Fix ftrace_update_ftrace_func panic
Steven J. Magnani wrote:
> 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 met
>>> 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).
>> I would like to replicate this problem to see that there is. I am not
>> able to reach this fault
>> Please copy & paste log with your commands.
>

> # echo 80 > /sys/kernel/debug/tracing/set_ftrace_pid
> BUG: failure at
> arch/microblaze/kernel/ftrace.c:202/ftrace_update_ftrace_func()!
> Kernel panic - not syncing: BUG!

I am able to replicate this fault on both versions.
Added to next branch.

Thanks,
Michal


--
Michal Simek, Ing. (M.Eng)
w: www.monstr.eu p: +42-0-721842854
Maintainer of Linux kernel 2.6 Microblaze Linux - http://www.monstr.eu/fdt/
Microblaze U-BOOT custodian


\
 
 \ /
  Last update: 2010-04-06 08:31    [from the cache]
©2003-2011 Jasper Spaans