Subject: Re: ftrace introduces instability into kernel 2.6.27(-rc2,-rc3)

From: Eran Liberty <[email-masked]>
Date: Wed, 20 Aug 2008 14:18:15 +0300

Steven Rostedt wrote:
> On Tue, 19 Aug 2008, Eran Liberty wrote:
>
>   
>> Steven Rostedt wrote:
>>     
>>>   
>>>       
>>>> Testing tracer sched_switch: PASSED
>>>> Testing tracer ftrace: PASSED
>>>> Testing dynamic ftrace: PASSED
>>>>         
>
> Do you have PREEMPT_TRACER enabled, or any other tracer for that matter?
>
> -- Steve
>   
I can see stack trace & context trace, but they are derived from other 
choices (I can not un select them)

cat .config | grep TRACE
CONFIG_STACKTRACE_SUPPORT=y
CONFIG_HAVE_ARCH_TRACEHOOK=y
# CONFIG_BLK_DEV_IO_TRACE is not set
CONFIG_STACKTRACE=y
# CONFIG_BACKTRACE_SELF_TEST is not set
CONFIG_HAVE_FTRACE=y
CONFIG_HAVE_DYNAMIC_FTRACE=y
CONFIG_FTRACE=y
# CONFIG_SCHED_TRACER is not set
CONFIG_CONTEXT_SWITCH_TRACER=y
CONFIG_DYNAMIC_FTRACE=y
CONFIG_FTRACE_SELFTEST=y
CONFIG_FTRACE_STARTUP_TEST=y
>   
>>>> Oops: Exception in kernel mode, sig: 11 [#1]
>>>> Exsw1600
>>>> Modules linked in:
>>>> NIP: c00bbb20 LR: c00bbb20 CTR: 00000000
>>>>     
>>>>         
>
>
>