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, greg k-h
