lkml.org 
[lkml]   [2019]   [Feb]   [26]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: [bug report][stable] perf probe: failed to add events
From
Date


On 19/2/26 21:08, Greg KH wrote:
> On Tue, Feb 26, 2019 at 08:32:34PM +0800, Joseph Qi wrote:
>>
>>
>> On 19/2/26 17:05, Greg KH wrote:
>>> On Tue, Feb 26, 2019 at 03:31:14PM +0800, Joseph Qi wrote:
>>>> Hi,
>>>>
>>>> I'm using kernel v4.19.24 and have found that there is an issue when
>>>> using perf probe to define a new dynamic tracepoint.
>>>>
>>>> $ perf probe -a handle_mm_fault
>>>> Failed to write event: Numerical result out of range
>>>> Error: Failed to add events.
>>>>
>>>> I've also tried kernel v4.20, and it can pass.
>>>
>>> Ick, has this ever worked on the 4.19 stable tree? If so, any chance
>>> you can run 'git bisect' to find the offending commit?
>>>
>> >From my test, v4.19.0 also has this issue.
>> Bisect locates that it is introduced by commit bf904d2762ee
>> "x86/pti/64: Remove the SYSCALL64 entry trampoline".
>
> But that commit was in 4.20, not 4.19. So if this never worked, it's
> not a regression?
>
> confused,
Oops, my fault.
The first bad commit is:
d83212d5dd67 kallsyms, x86: Export addresses of PTI entry trampolines

It is between v4.18 and v4.19.

>
> greg k-h
>

\
 
 \ /
  Last update: 2019-02-27 02:54    [W:0.084 / U:21.420 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site