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SubjectRe: [hw_breakpoint] WARNING: at kernel/trace/trace_kprobe.c:1393 kprobe_trace_self_tests_init()
Hi Oleg,

> > +-----------------------------------------------------------------------+------------+------------+------------------+
> > | | 003002e04e | 8b4d801b2b | v3.17-rc7_093000 |
> > +-----------------------------------------------------------------------+------------+------------+------------------+
> > | boot_successes | 60 | 0 | 0 |
> > | boot_failures | 0 | 20 | 11 |
> > | WARNING:at_kernel/trace/trace_kprobe.c:kprobe_trace_self_tests_init() | 0 | 20 | 11 |
> > | backtrace:kprobe_trace_self_tests_init | 0 | 20 | 11 |
> > | backtrace:warn_slowpath_null | 0 | 20 | 11 |
> > | backtrace:kernel_init_freeable | 0 | 20 | 11 |
> > +-----------------------------------------------------------------------+------------+------------+------------------+
> >
> > [ 4.188679] Testing kprobe tracing:
> > [ 4.189810] Could not insert probe at kprobe_trace_selftest_target+0: -22
>
> __register_trace_kprobe() fails.
>
> No, I am very sure this can't be caused by the commit above. If nothing else,
> task_bp_pinned() changed by this commit is not even called in this case.

Sorry it is a bad bisect -- debug shows that CONFIG_FTRACE_STARTUP_TEST
is not enabled at all in the parent commit, which makes it boot success.
I'll fix this issue in my script and make the bisect stable.

Thanks,
Fengguang


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