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<p class="MsoNormal">Sorry for the delay. Hope everyone had a good long weekend. See attached log captured from GDB session. Here is the punchline:<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-family:"Courier New"">Adding MemMgr 0x55555959f440<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-family:"Courier New"">unit-test: /localdisk/adstraw/ngraph/build/mlir_project/llvm-project/llvm/lib/ExecutionEngine/GDBRegistrationListener.cpp:164: virtual void {anonymous}::GDBJITRegistrationListener::notifyObjectLoaded(llvm::JITEventListener::ObjectKey,
const llvm::object::ObjectFile&, const llvm::RuntimeDyld::LoadedObjectInfo&): Assertion `ObjectBufferMap.find(K) == ObjectBufferMap.end() && "Second attempt to perform debug registration."' failed.<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-family:"Courier New""><o:p> </o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-family:"Courier New"">(gdb) print/x K<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-family:"Courier New"">$2 = 0x555559605c50</span><o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">The key (K) causing the assert a) does not match the addresses of the most recently added MemMgr and b) does not match the address of ANY MemMgr in the entire log file. The plot thickens.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Wondering if there is some other object (besides a MemMgr) that registers its address-as-key into `ObjectBufferMap`.
<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Adam <o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><b>From:</b> Lang Hames <lhames@gmail.com> <br>
<b>Sent:</b> Thursday, May 21, 2020 4:53 PM<br>
<b>To:</b> David Blaikie <dblaikie@gmail.com><br>
<b>Cc:</b> Straw, Adam D <adam.d.straw@intel.com>; llvm-dev@lists.llvm.org; Cyphers, Scott <scott.cyphers@intel.com>; Bobba, Jayaram <jayaram.bobba@intel.com>; Mostafa, Nagy H <nagy.h.mostafa@intel.com><br>
<b>Subject:</b> Re: [llvm-dev] [ORC JIT][MLIR] GDBRegistrationListener "second attempt to perform debug registration" assert<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<div>
<p class="MsoNormal">Hi Adam,<o:p></o:p></p>
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<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal">Calls to the listeners should be protected by the RTDyldLayerMutex. Could you apply the attached patch and share the debugging output from one of the failing runs?<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal">Regards,<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal">Lang.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<div>
<p class="MsoNormal">On Wed, May 20, 2020 at 8:00 PM David Blaikie <<a href="mailto:dblaikie@gmail.com">dblaikie@gmail.com</a>> wrote:<o:p></o:p></p>
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<blockquote style="border:none;border-left:solid #CCCCCC 1.0pt;padding:0in 0in 0in 6.0pt;margin-left:4.8pt;margin-right:0in">
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<p class="MsoNormal">+Lang<o:p></o:p></p>
</div>
<p class="MsoNormal"><o:p> </o:p></p>
<div>
<div>
<p class="MsoNormal">On Wed, May 20, 2020 at 4:44 PM Straw, Adam D via llvm-dev <<a href="mailto:llvm-dev@lists.llvm.org" target="_blank">llvm-dev@lists.llvm.org</a>> wrote:<o:p></o:p></p>
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<blockquote style="border:none;border-left:solid #CCCCCC 1.0pt;padding:0in 0in 0in 6.0pt;margin-left:4.8pt;margin-right:0in">
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<div>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Hi all,<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Attention: Lang Hames<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">I am developing the
<a href="https://github.com/NervanaSystems/ngraph/tree/master/src/contrib/mlir" target="_blank">
nGraph MLIR</a> implementation and hitting the following assert while running nGraph unit tests:<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-family:"Courier New""> assert(ObjectBufferMap.find(K) == ObjectBufferMap.end() &&</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-family:"Courier New""> "Second attempt to perform debug registration.");</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Here is a
<a href="https://github.com/llvm/llvm-project/blob/3d5360a4398bfa6878f94ca9ac55bc568692c765/llvm/lib/ExecutionEngine/GDBRegistrationListener.cpp#L163" target="_blank">
permalink</a> for that line of code on GitHub. The failure only occurs when running multiple unit tests back-to-back. Inevitably, if I rerun the failing unit test, it passes. The failure also tends to move around with a different unit tests failing on successive
runs.<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">I am able to hit the failure in GDB. Here is a partial backtrace:<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:.5in">
<span style="font-family:"Courier New"">#3 0x00007fffec4cf412 in __GI___assert_fail (assertion=assertion@entry=0x7ffff1d145e0 "ObjectBufferMap.find(K) == ObjectBufferMap.end() && \"Second attempt to perform debug registration.\"",
</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:.5in">
<span style="font-family:"Courier New""> file=file@entry=0x7ffff1d144d8 "/localdisk/adstraw/ngraph/build/mlir_project/llvm-project/llvm/lib/ExecutionEngine/GDBRegistrationListener.cpp", line=line@entry=164,
</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:.5in">
<span style="font-family:"Courier New""> function=function@entry=0x7ffff1d15520 <(anonymous namespace)::GDBJITRegistrationListener::notifyObjectLoaded(unsigned long, llvm::object::ObjectFile const&, llvm::RuntimeDyld::LoadedObjectInfo const&)::__PRETTY_FUNCTION__>
"virtual void {anonymous}::GDBJITRegistrationListener::notifyObjectLoaded(llvm::JITEventListener::ObjectKey, const llvm::object::ObjectFile&, const llvm::RuntimeDyld::LoadedObjectInfo&)")</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:.5in">
<span style="font-family:"Courier New""> at assert.c:101</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:.5in">
<span style="font-family:"Courier New"">#4 0x00007ffff01ed4d3 in (anonymous namespace)::GDBJITRegistrationListener::notifyObjectLoaded (this=0x5555591a9270,
<span style="color:black;background:yellow">K=93825060893584</span>, Obj=..., L=...)</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:.5in">
<span style="font-family:"Courier New""> at /localdisk/adstraw/ngraph/build/mlir_project/llvm-project/llvm/lib/ExecutionEngine/GDBRegistrationListener.cpp:163</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:.5in">
<span style="font-family:"Courier New"">#5 0x00007ffff01b0eca in std::function<void (unsigned long, llvm::object::ObjectFile const&, llvm::RuntimeDyld::LoadedObjectInfo const&)>::operator()(unsigned long, llvm::object::ObjectFile const&, llvm::RuntimeDyld::LoadedObjectInfo
const&) const (__args#2=..., __args#1=..., __args#0=<optimized out>, this=0x5555594e09b8) at /usr/include/c++/7/bits/std_function.h:706</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:.5in">
<span style="font-family:"Courier New"">#6 llvm::orc::RTDyldObjectLinkingLayer::onObjLoad (this=<optimized out>,
<span style="color:black;background:yellow">K=3</span>, R=..., Obj=..., MemMgr=0x5555591c4160, LoadedObjInfo=std::unique_ptr<llvm::RuntimeDyld::LoadedObjectInfo> = {...},
</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:.5in">
<span style="font-family:"Courier New""> Resolved=std::map with 8 elements = {...}, InternalSymbols=std::set with 0 elements)</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:.5in">
<span style="font-family:"Courier New""> at /localdisk/adstraw/ngraph/build/mlir_project/llvm-project/llvm/lib/ExecutionEngine/Orc/RTDyldObjectLinkingLayer.cpp:267</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">A little debug context:<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<ul type="disc">
<li class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l2 level1 lfo1">
<b>Frame #6</b> with K=3 we are about to execute the `NotifyLoaded` callback<o:p></o:p></li><li class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l2 level1 lfo1">
<b>Frame #5</b> we execute the `NotifyLoaded` callback which apparently transforms K from 3 to 93825060893584 (0x5555596CF390) which looks like a pointer. I don’t know the code well enough to grok what’s going on here. I’m not even sure where this callback
resides, but it could be <a href="https://github.com/llvm/llvm-project/blob/c66f89005f6d23b6885d8f93f33ff27dc60ce7dd/llvm/lib/ExecutionEngine/Orc/RTDyldObjectLinkingLayer.cpp#L312" target="_blank">
here</a> in RTDyldObjectLinkingLater.cpp where we are using the address of the `MemMgr` as K.<o:p></o:p></li><li class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l2 level1 lfo1">
<b>Frame #4 </b>now in `notifyObjectLoaded` with K=93825060893584 which will go on to assert in
<b>frame #3</b> due to the fact that that key (K) already exists in the map<o:p></o:p></li></ul>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">All of this leads me to believe there is some sort of race. Theory: with two unit tests A and B running back to back…<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<ol start="1" type="1">
<li class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l0 level1 lfo2">
Unit test A allocates and deallocates a `MemMgr` (or whatever other object we are using for a key) at address X<o:p></o:p></li><li class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l0 level1 lfo2">
Unit test A calls ` notifyFreeingObject` to free the object at K=X but gets stuck (does not lock) the ` JITDebugLock` mutex
<a href="https://github.com/llvm/llvm-project/blob/3d5360a4398bfa6878f94ca9ac55bc568692c765/llvm/lib/ExecutionEngine/GDBRegistrationListener.cpp#L181" target="_blank">
here</a> for whatever reason<o:p></o:p></li><li class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l0 level1 lfo2">
Meanwhile unit test B allocates a `MemMgr` (or whatever other object we are using for a key) at newly freed address X<o:p></o:p></li><li class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l0 level1 lfo2">
Unit test B calls `notifyObjectLoaded` to register the object at K=X and locks the ` JITDebugLock`
<a href="https://github.com/llvm/llvm-project/blob/3d5360a4398bfa6878f94ca9ac55bc568692c765/llvm/lib/ExecutionEngine/GDBRegistrationListener.cpp#L162" target="_blank">
here</a> with unit test A still waiting in step #2 above<o:p></o:p></li><li class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l0 level1 lfo2">
This goes on to assert as the key was not erased (step #2) before it was added (step #4)<o:p></o:p></li></ol>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">I could use a little help to debug the error further. Curiously, we do hit this issue in continuous integration (CI) --- only when running on development systems “by hand”. I
am investigating the differences (perhaps single vs. multi threaded?) as to why this might be the case.<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Note that I am using a slightly old version of MLIR master, I’m at this commit:<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:.5in">
<span style="font-family:"Courier New"">commit 2f8b4545f4960778e37114c024073d208751ca89</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:.5in">
<span style="font-family:"Courier New"">Author: Adam Straw <<a href="mailto:adam.d.straw@intel.com" target="_blank">adam.d.straw@intel.com</a>></span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:.5in">
<span style="font-family:"Courier New"">Date: Tue Apr 14 22:49:18 2020 +0300</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:.5in">
<span style="font-family:"Courier New""> </span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:.5in">
<span style="font-family:"Courier New""> [mlir] Fix assert on signed integer type in EDSC</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:.5in">
<span style="font-family:"Courier New""> </span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:.5in">
<span style="font-family:"Courier New""> Integer type in Std dialect is signless so we should be checking</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:.5in">
<span style="font-family:"Courier New""> for signless integer type instead of signed integer type in EDSC.</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:.5in">
<span style="font-family:"Courier New""> </span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:.5in">
<span style="font-family:"Courier New""> Differential Revision: <a href="https://reviews.llvm.org/D78144" target="_blank">
https://reviews.llvm.org/D78144</a></span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Thanks in advance for the help.<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Adam<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Note: I am out of office this Fri and the following Mon but otherwise should be prompt with email replies.<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-family:"Courier New""> </span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
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