I'm pretty sure some of the Mac OS X dtrace folks do lurk here, but the "better
vector" is <http://bugreport.apple.com/>.
-- Kaelin
On Dec 1, 2010, at 3:06 PM, Bryan Cantrill wrote:
> All,
>
> I've run into what appears to be a bug in the OS X port of libdtrace.
> Take the following script:
>
> ---8<--- bad.d ---8<---
>
> #pragma D option switchrate=5000hz
>
> profile-1234hz
> /arg1 != NULL && pid == $pid/
> {
> @[ufunc(arg1)] = count();
> }
>
> tick-1sec
> {
> printa(@);
> }
>
> ---8<--- bad.d ---8<---
>
> Running that yields the following output on my Mac running 10.6.4:
>
> % sudo ./bad.d
> dtrace: script './bad.d' matched 2 probes
> CPU ID FUNCTION:NAME
> 2 155691 :tick-1sec
>
> 2 155691 :tick-1sec
> libdtrace.dylib`dtrace_aggregate_snap 1
> libdtrace.dylib`gethrtime 1
> CoreFoundation`CFRetain 1
> libSystem.B.dylib`new_sem_from_pool 1
> libSystem.B.dylib`_pthread_cond_remove 1
> libSystem.B.dylib`__sflush 1
> libSystem.B.dylib`fflush 1
> libdtrace.dylib`dt_ioctl 2
> libSystem.B.dylib`pthread_mutex_lock 2
> libSystem.B.dylib`_pthread_cond_wait 2
> libSystem.B.dylib`semaphore_timedwait_signal_trap 3
> libSystem.B.dylib`__nanotime 3
> libSystem.B.dylib`semaphore_wait_trap 4
> libdtrace.dylib`dt_consume_cpu 5
> libSystem.B.dylib`ioctl 5
> libdtrace.dylib`dtrace_consume 6
> libSystem.B.dylib`__ioctl 11
>
> 2 155691 :tick-1sec
> dtrace`0x100003d72 1
> libdtrace.dylib`dtrace_aggregate_snap 1
> libdtrace.dylib`dtrace_work 1
> libdtrace.dylib`gethrtime 1
> CoreFoundation`CFRetain 1
> CoreSymbolication`NListRangeChecker<SizeAndEndianness<Pointer64,
> LittleEndian> >::next() 1
> Segmentation fault
> %
>
> Steve/James/other Apple folks: do you lurk here? Is there a better vector
> for filing bugs of this nature? (I have one other for you around argument
> stability.)
>
> Also, let me thank you again for the Mac port -- it's been very useful to
> be able to quickly prototype the DTrace-based infrastructure that we're
> currently building!
>
> - Bryan
> _______________________________________________
> dtrace-discuss mailing list
> dtrace-discuss@opensolaris.org
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