linux-kernel - Re: [bug report][stable] perf probe: failed to add events

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Date:   Tue, 26 Feb 2019 14:08:02 +0100
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Joseph Qi <joseph.qi@...ux.alibaba.com>
Cc:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        luto@...nel.org, Jiufei Xue <jiufei.xue@...ux.alibaba.com>,
        Xu Yu <xuyu@...ux.alibaba.com>, peterz@...radead.org,
        mingo@...hat.com, acme@...nel.org
Subject: Re: [bug report][stable] perf probe: failed to add events

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