Re: [BUG REPORT]: ARM64: perf: System hung in perf test

[Wangnan (F)]

On 2015/12/21 22:01, Will Deacon wrote:
> On Mon, Dec 21, 2015 at 08:56:03PM +0800, Wangnan (F) wrote:
[SNIP]
> >   # /perf test -v signal
> >   17: Test breakpoint overflow signal handler                  :
> >   --- start ---
> >   test child forked, pid 792
> >   count1 11, count2 11, overflow 11
> >   failed: RF EFLAG recursion issue detected
> >   failed: wrong overflow hit
> >   failed: wrong count for bp2
> >   test child finished with -1
> >   ---- end ----
> >   Test breakpoint overflow signal handler: FAILED!
> ... and this sounds like the perf tool expecting to single-step over
> signal handlers, whereas (on arm64) we deliberately single-step into
> them, so you can run into a loop for this case.

Could you please provide me more information? Do you think it is
a kernel bug and should be fixed? Or it is an invalid testcase for
aarch64?

Thank you.

> Will


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