Well, I'll let you all confirm that before I truly say so : ).
But, by sheer luck, I'm hoping I've found the memory-corruption bug causing my pd abstractions to be so unstable (as I've lamented quite a few times).
Hopefully this is narrowed down enough to be useful Miller! (I'm happy to pare it down further if there are too many extraneous objects)
Basically, open ds-slider-o-help.pd (which contains 10 copies of the GOP ds-slider-o.pd abstraction) and click the [CLICK TO CRASH( message which is connected to a [send] object with no destination.
Assigning a destination prevents the crash.
This would certainly make sense for my issues, as I use a ton of [s ] objects without arguments and it's likely that somewhere, one of them isn't being set properly.
I attached one of the crashlogs as well, which starts at "0 pd 0x00039cbe pd_typedmess + 142 (m_class.c:696)", but note that I also saw the "0 ??? ..." style crash as well that I'm assuming is indicative of corrupted memory?
I've tested this in Pd-extended 0.40 and in the latest Pd 0.42-3.
Best Luke
Nice work isolating it! It crashed for me with Pd-0.41.4-extended
too. It's strange since making a patch with just the [s] and a
message doesn't crash.
.hc
On Feb 1, 2009, at 3:43 AM, Luke Iannini wrote:
Well, I'll let you all confirm that before I truly say so : ).
But, by sheer luck, I'm hoping I've found the memory-corruption bug causing my pd abstractions to be so unstable (as I've lamented quite a few times).
Hopefully this is narrowed down enough to be useful Miller! (I'm happy to pare it down further if there are too many extraneous objects)
Basically, open ds-slider-o-help.pd (which contains 10 copies of the GOP ds-slider-o.pd abstraction) and click the [CLICK TO CRASH( message which is connected to a [send] object with no destination.
Assigning a destination prevents the crash.
This would certainly make sense for my issues, as I use a ton of [s ] objects without arguments and it's likely that somewhere, one of them isn't being set properly.
I attached one of the crashlogs as well, which starts at "0 pd 0x00039cbe pd_typedmess + 142 (m_class.c:696)", but note that I also saw the "0 ??? ..." style crash as well that I'm assuming is indicative of corrupted memory?
I've tested this in Pd-extended 0.40 and in the latest Pd 0.42-3.
Best Luke <crashlog.txt><ds-slider-o-help.pd><ds-slider- o.pd>_______________________________________________ Pd-list@iem.at mailing list UNSUBSCRIBE and account-management -> http://lists.puredata.info/listinfo/pd-list
Man has survived hitherto because he was too ignorant to know how to
realize his wishes. Now that he can realize them, he must either
change them, or perish. -William Carlos Williams
On Sun, 1 Feb 2009, Luke Iannini wrote:
I attached one of the crashlogs as well, which starts at "0 pd 0x00039cbe pd_typedmess + 142 (m_class.c:696)", but note that I also saw the "0 ??? ..." style crash as well that I'm assuming is indicative of corrupted memory?
"0 ???" can mean many things. It can mean that the markers in the code (which gdb calls "symbols") are not present, but barring that, it's usually that a function pointer has just been used and was wrong (for any reason including maybe memory corruption). After #0, it could also be that the stack has been corrupted such that the programme doesn't even know anymore where it's coming from, but for #0, that's not possible because that's not recorded on the stack at that moment.
There are lots of things that can be guessed from which calls are "???" and which aren't, and if you have full debugging on, you can also guess more things from whether the arguments being passed look sane or not.
If all (or almost all) entries after #0 are "???", then the stack-pointer has been corrupted, or the programme is optimised in a way that gdb doesn't understand (that's why it's easier to debug with optimisations turned off). It could also be a really bad case of stack corruption
Anyway, for this particular case... I think that the problem is a bit tricky to find. I could remove all instances of the abstraction except one and still get the crash. Then within the abstraction I could remove almost everything and still get the crash. In the end, with gdb's "break pd_bind" (and "cont" and "p (*x)->s_name->c_name)" I was able to find that it has to do with the [template] class registering itself to "".
Something weirder that happened is that I found that there are two symbols named "" (empty string) at once. Then I don't know how to go any further for now.
I made those attempts using pd 0.40-2.
_ _ __ ___ _____ ________ _____________ _____________________ ... | Mathieu Bouchard - tél:+1.514.383.3801, Montréal, Québec
Lovely... kaboom!
I'll check this out - I've had a couple of wierd moving crashes before and it's largely as Mathieu says, switching stuff around and using some intition.
cheers Miller
On Sun, Feb 01, 2009 at 12:43:48AM -0800, Luke Iannini wrote:
Well, I'll let you all confirm that before I truly say so : ).
But, by sheer luck, I'm hoping I've found the memory-corruption bug causing my pd abstractions to be so unstable (as I've lamented quite a few times).
Hopefully this is narrowed down enough to be useful Miller! (I'm happy to pare it down further if there are too many extraneous objects)
Basically, open ds-slider-o-help.pd (which contains 10 copies of the GOP ds-slider-o.pd abstraction) and click the [CLICK TO CRASH( message which is connected to a [send] object with no destination.
Assigning a destination prevents the crash.
This would certainly make sense for my issues, as I use a ton of [s ] objects without arguments and it's likely that somewhere, one of them isn't being set properly.
I attached one of the crashlogs as well, which starts at "0 pd 0x00039cbe pd_typedmess + 142 (m_class.c:696)", but note that I also saw the "0 ??? ..." style crash as well that I'm assuming is indicative of corrupted memory?
I've tested this in Pd-extended 0.40 and in the latest Pd 0.42-3.
Best Luke
Process: pd [25140] Path: /Applications/Pd-extended.app/Contents/Resources/Scripts/../bin/pd Identifier: pd Version: ??? (???) Code Type: X86 (Native) Parent Process: Pd-extended [25139]
Date/Time: 2009-02-01 00:26:38.233 -0800 OS Version: Mac OS X 10.5.6 (9G55) Report Version: 6
Exception Type: EXC_BAD_ACCESS (SIGSEGV) Exception Codes: KERN_INVALID_ADDRESS at 0x000000006573552f Crashed Thread: 0
Thread 0 Crashed: 0 pd 0x00039cbe pd_typedmess + 142 (m_class.c:696) 1 pd 0x00038c0a bindlist_anything + 49 (m_pd.c:107) 2 pd 0x00039f64 pd_typedmess + 820 (m_class.c:805) 3 pd 0x00039f64 pd_typedmess + 820 (m_class.c:805) 4 pd 0x0003b50e outlet_anything + 78 (m_obj.c:438) 5 pd 0x00039f64 pd_typedmess + 820 (m_class.c:805) 6 pd 0x0003d7df binbuf_eval + 1043 (m_binbuf.c:677) 7 pd 0x00009b22 message_float + 55 (g_text.c:309) 8 pd 0x00009dd6 message_click + 33 (g_text.c:391) 9 pd 0x0000b4b9 text_click + 209 (g_text.c:1091) 10 pd 0x0001ff20 canvas_doclick + 555 (g_editor.c:1094) 11 pd 0x000208a2 canvas_mousedown + 61 (g_editor.c:1257) 12 pd 0x0003a02a pd_typedmess + 1018 (m_class.c:779) 13 pd 0x00039f64 pd_typedmess + 820 (m_class.c:805) 14 pd 0x0003d7df binbuf_eval + 1043 (m_binbuf.c:677) 15 pd 0x000448ca socketreceiver_read + 1016 (s_inter.c:553) 16 pd 0x00043983 sys_domicrosleep + 367 (s_inter.c:193) 17 pd 0x000439e8 sys_microsleep + 19 (s_inter.c:216) 18 pd 0x0004185e m_scheduler + 658 (m_sched.c:492) 19 pd 0x00043770 sys_main + 1524 (s_main.c:320) 20 pd 0x000021ae _start + 216 21 pd 0x000020d5 start + 41
Thread 1: 0 libSystem.B.dylib 0x92df71c6 mach_msg_trap + 10 1 libSystem.B.dylib 0x92dfe9bc mach_msg + 72 2 com.apple.audio.midi.CoreMIDI 0x00625f0f XServerMachPort::ReceiveMessage(int&, void*, int&) + 101 3 com.apple.audio.midi.CoreMIDI 0x00618477 MIDIInPortThread::Run() + 111 4 com.apple.audio.midi.CoreMIDI 0x0061c07d XThread::RunHelper(void*) + 17 5 com.apple.audio.midi.CoreMIDI 0x006269ee CAPThread::Entry(CAPThread*) + 96 6 libSystem.B.dylib 0x92e28095 _pthread_start + 321 7 libSystem.B.dylib 0x92e27f52 thread_start + 34
Thread 2: 0 libSystem.B.dylib 0x92dfe3ae __semwait_signal + 10 1 libSystem.B.dylib 0x92e28d0d pthread_cond_wait$UNIX2003 + 73 2 libGLProgrammability.dylib 0x93e3ab32 glvmDoWork + 162 3 libSystem.B.dylib 0x92e28095 _pthread_start + 321 4 libSystem.B.dylib 0x92e27f52 thread_start + 34
Thread 3: 0 libSystem.B.dylib 0x92df720e semaphore_wait_signal_trap + 10 1 libSystem.B.dylib 0x92e29206 _pthread_cond_wait + 1267 2 libSystem.B.dylib 0x92e6e539 pthread_cond_wait + 48 3 py.pd_darwin 0x1371aa68 flext_multi::ThrCond::Wait() + 34 4 py.pd_darwin 0x1371ab32 flext_multi::ThrHelper(void*) + 178 5 libSystem.B.dylib 0x92e28095 _pthread_start + 321 6 libSystem.B.dylib 0x92e27f52 thread_start + 34
Thread 4: 0 libSystem.B.dylib 0x92df7226 semaphore_timedwait_signal_trap + 10 1 libSystem.B.dylib 0x92e291ef _pthread_cond_wait + 1244 2 libSystem.B.dylib 0x92e73aaf pthread_cond_timedwait + 47 3 py.pd_darwin 0x1371a638 flext_multi::ThrCond::TimedWait(double) + 204 4 py.pd_darwin 0x1371f84a flext_base_multi::QWorker(flext_multi::thr_params*) + 62 5 py.pd_darwin 0x1371a945 flext_multi::ThreadRegistryWorker() + 197 6 libSystem.B.dylib 0x92e28095 _pthread_start + 321 7 libSystem.B.dylib 0x92e27f52 thread_start + 34
Thread 5: 0 libSystem.B.dylib 0x92e2e30a select$DARWIN_EXTSN$NOCANCEL + 10 1 time.so 0x13c1589d time_sleep + 182 (timemodule.c:910) 2 org.python.python 0x1374f278 PyObject_Call + 45 (abstract.c:1860) 3 org.python.python 0x137d35b2 PyEval_CallObjectWithKeywords + 112 (ceval.c:3433) 4 org.python.python 0x1374f249 PyObject_CallObject + 32 (abstract.c:1852) 5 py.pd_darwin 0x13712b17 pybase::pyworker(flext_multi::thr_params*) + 103 6 py.pd_darwin 0x1371a945 flext_multi::ThreadRegistryWorker() + 197 7 libSystem.B.dylib 0x92e28095 _pthread_start + 321 8 libSystem.B.dylib 0x92e27f52 thread_start + 34
Thread 6: 0 libSystem.B.dylib 0x92df720e semaphore_wait_signal_trap + 10 1 libSystem.B.dylib 0x92e29206 _pthread_cond_wait + 1267 2 libSystem.B.dylib 0x92e6e539 pthread_cond_wait + 48 3 py.pd_darwin 0x1371aa68 flext_multi::ThrCond::Wait() + 34 4 py.pd_darwin 0x13712d4e pybase::quworker(flext_multi::thr_params*) + 190 5 py.pd_darwin 0x1371a945 flext_multi::ThreadRegistryWorker() + 197 6 libSystem.B.dylib 0x92e28095 _pthread_start + 321 7 libSystem.B.dylib 0x92e27f52 thread_start + 34
Thread 0 crashed with X86 Thread State (32-bit): eax: 0x1441d920 ebx: 0x00039c41 ecx: 0x0008b7a8 edx: 0x6573552f edi: 0x00000002 esi: 0x0008b7b0 ebp: 0xbfffd9c8 esp: 0xbfffd920 ss: 0x0000001f efl: 0x00010206 eip: 0x00039cbe cs: 0x00000017 ds: 0x0000001f es: 0x0000001f fs: 0x00000000 gs: 0x00000037 cr2: 0x6573552f
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On Mon, 2 Feb 2009, Miller Puckette wrote:
I'll check this out - I've had a couple of wierd moving crashes before and it's largely as Mathieu says, switching stuff around and using some intition.
I don't know whether you use Valgrind, but I would very much recommend it. It runs your programme in a sort of emulator that checks all memory accesses. It can help you find a lot more bugs than gdb can. It can tell you whether it's an uninitialised pointer, dangling pointer, double free, buffer overflow, etc., and give you both a backtrace of the problem and a backtrace of the related malloc (!!!).
The main downside is that there can be a lot of false positives, so you have to learn to recognise those as such and perhaps have to make yourself a "suppression file" to hide them.
The other main downside is that it can't find most stack-related problems because that would require the collaboration of the compiler. But most of the trickiest bugs tend to be malloc-related rather than stack-related.
Of course you can't debug everything with valgrind and this is why I also use gdb.
I wish gdb were more customisable, so that for example it could print a t_symbol * like:
gensym("hello")
for example. it could save a lot of time.
_ _ __ ___ _____ ________ _____________ _____________________ ... | Mathieu Bouchard - tél:+1.514.383.3801, Montréal, Québec
Thanks -- that was just what I needed to find it... here's a patch that should fix it. I'll be puttint up a new bugfix release after I manage to clean up another couple of problems.
Miller
diff --git a/src/g_template.c b/src/g_template.c index 34541c0..f216b10 100644 --- a/src/g_template.c +++ b/src/g_template.c @@ -106,7 +106,7 @@ t_template *template_new(t_symbol *templatesym, int argc, t_ bad: argc -= 2; argv += 2; }
- if (templatesym->s_name)
- if (*templatesym->s_name) { x->t_sym = templatesym; pd_bind(&x->t_pdobj, x->t_sym);
On Sun, Feb 01, 2009 at 12:43:48AM -0800, Luke Iannini wrote:
Well, I'll let you all confirm that before I truly say so : ).
But, by sheer luck, I'm hoping I've found the memory-corruption bug causing my pd abstractions to be so unstable (as I've lamented quite a few times).
Hopefully this is narrowed down enough to be useful Miller! (I'm happy to pare it down further if there are too many extraneous objects)
Basically, open ds-slider-o-help.pd (which contains 10 copies of the GOP ds-slider-o.pd abstraction) and click the [CLICK TO CRASH( message which is connected to a [send] object with no destination.
Assigning a destination prevents the crash.
[...]
On Mon, Feb 2, 2009 at 7:44 PM, Miller Puckette mpuckett@imusic1.ucsd.edu wrote:
Thanks -- that was just what I needed to find it... here's a patch that should fix it. I'll be puttint up a new bugfix release after I manage to clean up another couple of problems.
Hi Miller, a little late, but just wanted to say a big thanks for finding this and fixing it! I'm very happy to be able to continue work on my sequencers crash-free : ) Best Luke
Miller
diff --git a/src/g_template.c b/src/g_template.c index 34541c0..f216b10 100644 --- a/src/g_template.c +++ b/src/g_template.c @@ -106,7 +106,7 @@ t_template *template_new(t_symbol *templatesym, int argc, t_ bad: argc -= 2; argv += 2; }
- if (templatesym->s_name)
- if (*templatesym->s_name) { x->t_sym = templatesym; pd_bind(&x->t_pdobj, x->t_sym);
On Sun, Feb 01, 2009 at 12:43:48AM -0800, Luke Iannini wrote:
Well, I'll let you all confirm that before I truly say so : ).
But, by sheer luck, I'm hoping I've found the memory-corruption bug causing my pd abstractions to be so unstable (as I've lamented quite a few times).
Hopefully this is narrowed down enough to be useful Miller! (I'm happy to pare it down further if there are too many extraneous objects)
Basically, open ds-slider-o-help.pd (which contains 10 copies of the GOP ds-slider-o.pd abstraction) and click the [CLICK TO CRASH( message which is connected to a [send] object with no destination.
Assigning a destination prevents the crash.
[...]
On Tue, 10 Feb 2009, Luke Iannini wrote:
Hi Miller, a little late, but just wanted to say a big thanks for finding this and fixing it! I'm very happy to be able to continue work on my sequencers crash-free : )
Also, there is another thing that looks like a bug, but is about something undocumented. [makefilename] without an argument seems like it was intended to do [makefilename file.%d], but there's this same missing star:
if (!s->s_name) s = gensym("file.%d");
vs if (!*s->s_name) s = gensym("file.%d");
Because Pd uses &s_ as default value for a symbol arg, not a null pointer, so s->s_name is never considered "false"... same bug, really.
I don't really care about that one, nor that anyone would want to use that default value, and the line could also be removed altogether, and it would be as fine, as removing a useless line is good, and removing a misleading useless line is even better.
_ _ __ ___ _____ ________ _____________ _____________________ ... | Mathieu Bouchard - tél:+1.514.383.3801, Montréal, Québec
Mathieu Bouchard wrote:
if (!s->s_name) s = gensym("file.%d");vs if (!*s->s_name) s = gensym("file.%d");
Because Pd uses &s_ as default value for a symbol arg, not a null pointer, so s->s_name is never considered "false"... same bug, really.
btw, this has been fixed in some bugfix release of 0.42
gmadsr IOhannes
-
Hans-Christoph Steiner -
IOhannes m zmölnig -
Luke Iannini -
Mathieu Bouchard -
Miller Puckette