Kernel WARNING at lib/vsprintf.c:2721 while running ftrace kernel selftests

[Sachin Sant]

> On 27-Feb-2024, at 10:38 PM, Steven Rostedt <rostedt at goodmis.org> wrote:
> 
> On Tue, 27 Feb 2024 11:56:14 -0500
> Steven Rostedt <rostedt at goodmis.org> wrote:
> 
>> On Tue, 27 Feb 2024 22:08:18 +0530
>> Sachin Sant <sachinp at linux.ibm.com> wrote:
>> 
>>>> Can you apply this, and see if it triggers and if it does, print the line
>>>> that has the max size?
>>>> 
>>> 
>>> With this I see following trace
>>> 
>>> [   61.327138] ------------[ cut here ]------------
>>> [   61.327159] MAX OUT OF RANGE 63492  
>> 
>> Well I guess there you have it ;-)
>> 
>> vsprintf() doesn't like a precision of 63492!
>> 
>> I'll look to see what the best way to deal with this is.
> 
> Does this fix it?
> 
Thank You. Yup this fixes the reported problem.

# ./ftracetest test.d/00basic/trace_marker.tc 
=== Ftrace unit tests ===
[1] Basic tests on writing to trace_marker [PASS]
[2] (instance)  Basic tests on writing to trace_marker [PASS]


# of passed:  2
# of failed:  0
# of unresolved:  0
# of untested:  0
# of unsupported:  0
# of xfailed:  0
# of undefined(test bug):  0
# 

Remaining test also completed without any issues. Based on the test results

Tested-by: Sachin Sant <sachinp at linux.ibm.com>

Thanks
— Sachin