[PATCH v3 08/11] ptrace: Admit ptrace_stop can generate spuriuos SIGTRAPs

[Oleg Nesterov]

On 05/05, Eric W. Biederman wrote:
>
> And yes that WARN_ON_ONCE can trigger on PREEMPT_RT but that is just
> because PREMPT_RT is currently broken with respect to ptrace.  Which
> makes a WARN_ON_ONCE appropriate.

Yes agreed. In this case WARN_ON_ONCE() can help a user to understand
that a failure was caused by the kernel problem which we need to fix
anyway.

Oleg.