[Bug 84232] New: PHINode containing itself causes segfault in LLVM when compiling Blender OpenCL kernel with R600 backend

[Bug 84232] New: PHINode containing itself causes segfault in LLVM when compiling Blender OpenCL kernel with R600 backend

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=84232

          Priority: medium
            Bug ID: 84232
          Assignee: dri-devel@lists.freedesktop.org
           Summary: PHINode containing itself causes segfault in LLVM when
                    compiling Blender OpenCL kernel with R600 backend
          Severity: normal
    Classification: Unclassified
                OS: All
          Reporter: vitalif@yourcmc.ru
          Hardware: Other
            Status: NEW
           Version: XOrg CVS
         Component: DRM/Radeon
           Product: DRI

Created attachment 106717
  --> https://bugs.freedesktop.org/attachment.cgi?id=106717&action=edit
Blender output with R600_DEBUG=compute,fs,vs,gs,ps,cs

I'm trying to run Blender using Mesa OpenCL implementation on a radeonsi  card.
First the kernel didn't want to compile, but that was caused by a  bug in it
(they were using . instead of -> in 1 place), and after fixing  this bug I've
got the kernel to compile...

...But after that, LLVM started to crash during translation of IR into  shader
code with R600 backend.

I've done some investigation and figured out that the crash is caused by a 
PHINode containing itself. SIAnnotateControlFlow::handleLoopCondition()  can't
handle such situation - it recurses into itself, calls  Phi->eraseFromParent()
inside the inner execution, returns into outer one,  gets zeroed out object and
crashes when trying to do something with its  members... for example when
trying to erase it again.

I've tried to understand the semantics of such PHINodes from reading the code
and got a suspicion that the rest of LLVM code just ignores PHINodes equal to
their parent, so I've tried to fix  the bug by making handleLoopCondition()
skip IncomingValues equal to the Phi itself, but the bug didn't go away!
Surprisingly, PHINode may not just contain itself directly, but it also may
contain itself inside another PHINode, i.e.
Phi->getIncomingValue(0)->getIncomingValue(0) == Phi, which results in the same
problem with SIAnnotateControlFlow...

I'll attach Blender output with R600_DEBUG = trace everything and a stack trace
of the crash.

The bug reproduced with llvm 3.5 and snapshot of 3.6; blender is 2.71; Mesa is
from OIBAF's repository.

sudo -E CYCLES_OPENCL_TEST=1 R600_DEBUG=compute,fs,vs,gs,ps,cs blender cup\ of\
coffee\ 5.blend &> kernel-llvm.log

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[Bug 84232] PHINode containing itself causes segfault in LLVM when compiling Blender OpenCL kernel with R600 backend

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=84232

--- Comment #1 from Vitaliy Filippov <vitalif@yourcmc.ru> ---
Created attachment 106718
  --> https://bugs.freedesktop.org/attachment.cgi?id=106718&action=edit
Stack trace

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[Bug 84232] PHINode containing itself causes segfault in LLVM when compiling Blender OpenCL kernel with R600 backend

[bugzilla-daemon]

[-- Attachment #1.1: Type: text/plain, Size: 482 bytes --]

https://bugs.freedesktop.org/show_bug.cgi?id=84232

Alex Deucher <agd5f@yahoo.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Product|DRI                         |Mesa
            Version|XOrg CVS                    |git
          Component|DRM/Radeon                  |Drivers/Gallium/radeonsi

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[Bug 84232] PHINode containing itself causes segfault in LLVM when compiling Blender OpenCL kernel with R600 backend

[bugzilla-daemon]

[-- Attachment #1.1: Type: text/plain, Size: 1146 bytes --]

https://bugs.freedesktop.org/show_bug.cgi?id=84232

--- Comment #2 from Vitaliy Filippov <vitalif@yourcmc.ru> ---
Created attachment 107527
  --> https://bugs.freedesktop.org/attachment.cgi?id=107527&action=edit
Attempt to reduce testcase using bugpoint

Tried to reduce the case using bugpoint:

PATH=/usr/lib/llvm-3.5/bin/:$PATH bugpoint-3.5 kernel.ll --llc-safe --tool-args
-- -march=r600 -mcpu=oland

The result leads to other crash, maybe it's also a bug, but it's definitely
another bug:

llc-3.5 -march=r600 -mcpu=oland bugpoint-reduced-simplified.ll

Which leads to a segfault on a non-assert build and to the following message on
a release+asserts build:

Unhandled loop condition!
UNREACHABLE executed at
/var/home/vitali/setup/llvm-toolchain-3.5-3.5/lib/Target/R600/SIAnnotateControlFlow.cpp:259!

This is probably related to bugpoint replacing the branch conditions with
constants, which makes conditional branches effectively unconditional :) and
SIAnnotateControlFlow::handleLoopCondition also doesn't handle this case.

Looks like an easy to fix problem?

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[Bug 84232] PHINode containing itself causes segfault in LLVM when compiling Blender OpenCL kernel with R600 backend

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https://bugs.freedesktop.org/show_bug.cgi?id=84232

--- Comment #3 from Matt Arsenault <arsenm2@gmail.com> ---
(In reply to Vitaliy Filippov from comment #2)

> 
> Unhandled loop condition!
> UNREACHABLE executed at
> /var/home/vitali/setup/llvm-toolchain-3.5-3.5/lib/Target/R600/
> SIAnnotateControlFlow.cpp:259!
> 
> This is probably related to bugpoint replacing the branch conditions with
> constants, which makes conditional branches effectively unconditional :) and
> SIAnnotateControlFlow::handleLoopCondition also doesn't handle this case.
> 
> Looks like an easy to fix problem?

The StructurizeCFG pass can actually create branches on constants, although it
shouldn't, which I've seen several times before. I've had a partial fix for
SIAnnotateControlFlow handling branches on constants for a while, but I've been
putting off fixing it until the less noticeable StructurizeCFG problem is
fixed.

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[Bug 84232] PHINode containing itself causes segfault in LLVM when compiling Blender OpenCL kernel with R600 backend

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=84232

Vitaliy Filippov <vitalif@yourcmc.ru> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |arsenm2@gmail.com

--- Comment #4 from Vitaliy Filippov <vitalif@yourcmc.ru> ---
The problem is that the inability of SIAnnotateControlFlow to handle constants
confuses bugpoint and it doesn't emit the correct testcase for the initial
crash which I've reported in this bug...

OK if I add you to the CC list? :)

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[Bug 84232] PHINode containing itself causes segfault in LLVM when compiling Blender OpenCL kernel with R600 backend

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https://bugs.freedesktop.org/show_bug.cgi?id=84232

--- Comment #5 from Tom Stellard <tstellar@gmail.com> ---
It looks like the following sequence may trigger this bug:

for () {
  if (){
    break;
  }
  if () {
    if () {
        break;
    }
  }
  if () {
     break;
  }
}

I will investigate further.

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[Bug 84232] PHINode containing itself causes segfault in LLVM when compiling Blender OpenCL kernel with R600 backend

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https://bugs.freedesktop.org/show_bug.cgi?id=84232

--- Comment #6 from Vitaliy Filippov <vitalif@yourcmc.ru> ---
Hm, I've tried to reproduce your testcase and got another bug:

int main()
{
  int i;
  for (i = 0; i < 100; i++)
  {
    if (!(i%10))
    {
      i = i%50;
      if (i%2 == 0)
        break;
    }
  }
  return i;
}

clang-3.5 -S -emit-llvm test.c
llc-3.5 -march=r600 -mcpu=oland test.ll 

>>>>

Program received signal SIGSEGV, Segmentation fault.
llvm::BasicBlock::getTerminator (this=0x471f08) at
/var/home/vitali/setup/llvm/llvm-toolchain-3.5-3.5/lib/IR/BasicBlock.cpp:126
126       return dyn_cast<TerminatorInst>(&InstList.back());
(gdb) bt
#0  llvm::BasicBlock::getTerminator (this=0x471f08) at
/var/home/vitali/setup/llvm/llvm-toolchain-3.5-3.5/lib/IR/BasicBlock.cpp:126
#1  0x00007ffff7442c9a in (anonymous
namespace)::SIAnnotateControlFlow::handleLoopCondition
(this=this@entry=0x44c960, Cond=0x471eb0, Broken=Broken@entry=
    0x486a50) at
/var/home/vitali/setup/llvm/llvm-toolchain-3.5-3.5/lib/Target/R600/SIAnnotateControlFlow.cpp:271
#2  0x00007ffff7443d6c in handleLoop (Term=0x486af8, this=0x44c960)
    at
/var/home/vitali/setup/llvm/llvm-toolchain-3.5-3.5/lib/Target/R600/SIAnnotateControlFlow.cpp:288
#3  (anonymous namespace)::SIAnnotateControlFlow::runOnFunction (this=0x44c960,
F=...)
    at
/var/home/vitali/setup/llvm/llvm-toolchain-3.5-3.5/lib/Target/R600/SIAnnotateControlFlow.cpp:325
#4  0x00007ffff662a3d7 in llvm::FPPassManager::runOnFunction (this=0x43e930,
F=...)
    at
/var/home/vitali/setup/llvm/llvm-toolchain-3.5-3.5/lib/IR/LegacyPassManager.cpp:1545
#5  0x00007ffff662a45b in llvm::FPPassManager::runOnModule (this=0x43e930,
M=...)
    at
/var/home/vitali/setup/llvm/llvm-toolchain-3.5-3.5/lib/IR/LegacyPassManager.cpp:1565
#6  0x00007ffff662ce19 in runOnModule (M=..., this=0x431140) at
/var/home/vitali/setup/llvm/llvm-toolchain-3.5-3.5/lib/IR/LegacyPassManager.cpp:1623
#7  llvm::legacy::PassManagerImpl::run (this=0x430e50, M=...) at
/var/home/vitali/setup/llvm/llvm-toolchain-3.5-3.5/lib/IR/LegacyPassManager.cpp:1730
#8  0x0000000000411a11 in ?? ()
#9  0x000000000040cd98 in main ()

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[Bug 84232] PHINode containing itself causes segfault in LLVM when compiling Blender OpenCL kernel with R600 backend

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https://bugs.freedesktop.org/show_bug.cgi?id=84232

--- Comment #7 from Vitaliy Filippov <vitalif@yourcmc.ru> ---
Another thought: it seems PHINode that contain itself are also a product of
StructurizeCFG! After running `opt-3.5 -S -structurizecfg kernel.ll >
kernel-scfg.ll` on the kernel from attached blender output, kernel-scfg.ll
contains phinode that reference themselves directly... While kernel.ll did not
contain such PHINodes.

grep -P '(%\S+) = phi.*\1' kernel-scfg.ll 
  %18919 = phi float [ %18919, %Flow196 ], [ %19044, %Flow162 ], [ %18839,
%18838 ]
  %18920 = phi float [ %18920, %Flow196 ], [ %18915, %Flow162 ], [ %18840,
%18838 ]
  %18921 = phi <4 x float> addrspace(1)* [ %18921, %Flow196 ], [ %18896,
%Flow162 ], [ %18841, %18838 ]
  %18922 = phi i32 [ %18922, %Flow196 ], [ %18895, %Flow162 ], [ %18842, %18838
]
  %18923 = phi i32 [ %18923, %Flow196 ], [ %18894, %Flow162 ], [ %18843, %18838
]
  %19208 = phi i64 [ %19208, %Flow195 ], [ %indvars.iv.next.i.i, %Flow164 ], [
%18953, %Flow161 ]
  %19209 = phi float [ %19209, %Flow195 ], [ %19056, %Flow164 ], [ %18954,
%Flow161 ]
  %19210 = phi float [ %19210, %Flow195 ], [ %19055, %Flow164 ], [ %18955,
%Flow161 ]
  %19211 = phi float [ %19211, %Flow195 ], [ %19054, %Flow164 ], [ %18956,
%Flow161 ]
  %19212 = phi i32 [ %19212, %Flow195 ], [ %19053, %Flow164 ], [ %18957,
%Flow161 ]
  %19213 = phi i32 [ %19213, %Flow195 ], [ %19052, %Flow164 ], [ %18958,
%Flow161 ]
  %19227 = phi i1 [ %19227, %Flow195 ], [ %19059, %Flow164 ], [ true, %Flow161
]
  %19590 = phi <4 x float> [ %19590, %Flow188 ], [ %20245, %Flow171 ], [
%19529, %Flow169 ]
  %19591 = phi <4 x float> [ %19591, %Flow188 ], [ %20246, %Flow171 ], [
%19530, %Flow169 ]
  %19592 = phi float [ %19592, %Flow188 ], [ %20247, %Flow171 ], [ %19531,
%Flow169 ]
  %19593 = phi <4 x float> [ %19593, %Flow188 ], [ %20248, %Flow171 ], [
%19532, %Flow169 ]
  %19594 = phi <4 x float> [ %19594, %Flow188 ], [ %20249, %Flow171 ], [
%19533, %Flow169 ]
  %19595 = phi <4 x float> [ %19595, %Flow188 ], [ %20250, %Flow171 ], [
%19534, %Flow169 ]
  %19596 = phi <4 x float> [ %19596, %Flow188 ], [ %20251, %Flow171 ], [
%19535, %Flow169 ]
  %19597 = phi i32 [ %19597, %Flow188 ], [ %20252, %Flow171 ], [ %19536,
%Flow169 ]
  %19598 = phi i32 [ %19598, %Flow188 ], [ %20253, %Flow171 ], [ %19537,
%Flow169 ]
  %19599 = phi i32 [ %19599, %Flow188 ], [ %20254, %Flow171 ], [ %19538,
%Flow169 ]
  %19600 = phi <4 x float> [ %19600, %Flow188 ], [ %20255, %Flow171 ], [
%19539, %Flow169 ]
  %19601 = phi <4 x float> [ %19601, %Flow188 ], [ %20256, %Flow171 ], [
%19540, %Flow169 ]
  %19609 = phi float [ %19609, %Flow188 ], [ undef, %Flow171 ], [ %19548,
%Flow169 ]
  %19610 = phi float [ %19610, %Flow188 ], [ undef, %Flow171 ], [ %19549,
%Flow169 ]
  %19611 = phi float [ %19611, %Flow188 ], [ undef, %Flow171 ], [ %19550,
%Flow169 ]
  %19612 = phi i32 [ %19612, %Flow188 ], [ undef, %Flow171 ], [ %19551,
%Flow169 ]
  %19613 = phi i32 [ %19613, %Flow188 ], [ undef, %Flow171 ], [ %19552,
%Flow169 ]
  %19625 = phi i1 [ %19625, %Flow188 ], [ %20257, %Flow171 ], [ %19569,
%Flow169 ]
  %19627 = phi i1 [ %19627, %Flow188 ], [ %20258, %Flow171 ], [ %19571,
%Flow169 ]

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[Bug 84232] PHINode containing itself causes segfault in LLVM when compiling Blender OpenCL kernel with R600 backend

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https://bugs.freedesktop.org/show_bug.cgi?id=84232

--- Comment #8 from Tom Stellard <tstellar@gmail.com> ---
Created attachment 107681
  --> https://bugs.freedesktop.org/attachment.cgi?id=107681&action=edit
Reduced Test Case

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[Bug 84232] PHINode containing itself causes segfault in LLVM when compiling Blender OpenCL kernel with R600 backend

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https://bugs.freedesktop.org/show_bug.cgi?id=84232

--- Comment #9 from Vitaliy Filippov <vitalif@yourcmc.ru> ---
Do I understand it right that the "Reduced test case" is about constant branch
condition?

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[Bug 84232] PHINode containing itself causes segfault in LLVM when compiling Blender OpenCL kernel with R600 backend

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https://bugs.freedesktop.org/show_bug.cgi?id=84232

--- Comment #10 from Vitaliy Filippov <vitalif@yourcmc.ru> ---
I've managed to make a reduced test case with a recursive PHI after
StructurizeCFG !!!

int main()
{
  int i, j = 0;
  while (j % 2)
  {
    if (j > 100)
      j += 3;
    else if (j > 50)
      break;
  }
  return j;
}

clang-3.5 -S -emit-llvm test3.c
opt-3.5 -S -structurizecfg test3.ll > test3cfg.ll

Simple to visualise with graphviz:

( echo 'digraph G {'; perl -ne 'if (/\%(\S+) = phi/) { my $a = $1; print "$a ->
$_;\n" for /\[ \%([^\s,]+)/g; }' test3cfg.ll; echo '}' ) > test3cfg.dot
dot -Tsvg test3cfg.dot > test3cfg.svg

%21 and %26 phi's loop in the result.

Also there is a branch on constant in the end of test3cfg.ll:

br i1 false, label %14, label %Flow2

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[Bug 84232] PHINode containing itself causes segfault in LLVM when compiling Blender OpenCL kernel with R600 backend

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https://bugs.freedesktop.org/show_bug.cgi?id=84232

--- Comment #11 from Vitaliy Filippov <vitalif@yourcmc.ru> ---
Created attachment 108266
  --> https://bugs.freedesktop.org/attachment.cgi?id=108266&action=edit
StructurizeCFG IR output for the sample from comment 10

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[Bug 84232] PHINode containing itself causes segfault in LLVM when compiling Blender OpenCL kernel with R600 backend

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https://bugs.freedesktop.org/show_bug.cgi?id=84232

--- Comment #12 from Vitaliy Filippov <vitalif@yourcmc.ru> ---
Hm... Checked the test from comment 6, the result is the same - there are two
PHINode loops and one branch on constant.

Also checked the code, it looks like crash from comment 6 is also triggered by
a branch-on-constant, the difference is that it crashes when a ConstantInt is
dyn_cast<>'ed to incorrect class - Instruction (ConstantInt isn't an
Instruction!!) in handleLoopCondition() and getTerminator() is called on it.

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[Bug 84232] PHINode containing itself causes segfault in LLVM when compiling Blender OpenCL kernel with R600 backend

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https://bugs.freedesktop.org/show_bug.cgi?id=84232

--- Comment #13 from Vitaliy Filippov <vitalif@yourcmc.ru> ---
It seems that the StructurizeCFG branch-on-constant bug not only crashes R600,
but actually generates invalid code!

It's clearly seen that in the IR code from comment 11 (structurizecfg output of
comment 10) (j > 50) comparison is contained in block %14, so it must be
reachable. But it's unreachable because the only branch there is that constant
branch instruction from %25 that always avoids %14...

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--- Comment #14 from Vitaliy Filippov <vitalif@yourcmc.ru> ---
Wow!! Tom, did you just fix this bug with commit
857550322c6fe679d17d35c885606ae1d8cf43b6?

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https://bugs.freedesktop.org/show_bug.cgi?id=84232

--- Comment #15 from Tom Stellard <tstellar@gmail.com> ---
(In reply to Vitaliy Filippov from comment #14)
> Wow!! Tom, did you just fix this bug with commit
> 857550322c6fe679d17d35c885606ae1d8cf43b6?

Possibly, does blender work now (or at least does it no longer crash)?

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[Bug 84232] PHINode containing itself causes segfault in LLVM when compiling Blender OpenCL kernel with R600 backend

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https://bugs.freedesktop.org/show_bug.cgi?id=84232

--- Comment #16 from Vitaliy Filippov <vitalif@yourcmc.ru> ---
(In reply to Tom Stellard from comment #15)
> Possibly, does blender work now (or at least does it no longer crash)?

Yes, it doesn't crash anymore, thanks!

There are still other bugs that prevent it from running, and as I understand
most renderer features are disabled with default flags/defines under Mesa...
>From https://developer.blender.org/T41912 - "Note though: Building without SVM
gives you only very basic clay like rendering, not really usable."

The first bug is about libclc - it incorrectly references fabsf() in R600
bytecode files, while it should probably use llvm.fabs.f32()... Where to report
it?

Second, it seems Blender developers are using half-precision floats
(vstore_half4 function)... it's used in only one place and I don't know if its
usage is really critical, but it of course prevents the kernel from
compiling... I've reported it here https://developer.blender.org/T42813

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[Bug 84232] PHINode containing itself causes segfault in LLVM when compiling Blender OpenCL kernel with R600 backend

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https://bugs.freedesktop.org/show_bug.cgi?id=84232

Vedran Miletić <vedran@miletic.net> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Blocks|                            |99553

--- Comment #17 from Vedran Miletić <vedran@miletic.net> ---
Vitaliy, is this still an issue?


Referenced Bugs:

https://bugs.freedesktop.org/show_bug.cgi?id=99553
[Bug 99553] Tracker bug for runnning OpenCL applications on Clover
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[Bug 84232] PHINode containing itself causes segfault in LLVM when compiling Blender OpenCL kernel with R600 backend

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https://bugs.freedesktop.org/show_bug.cgi?id=84232

Vedran Miletić <vedran@miletic.net> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         QA Contact|                            |dri-devel@lists.freedesktop
                   |                            |.org

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[Bug 84232] PHINode containing itself causes segfault in LLVM when compiling Blender OpenCL kernel with R600 backend

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https://bugs.freedesktop.org/show_bug.cgi?id=84232

Timothy Arceri <t_arceri@yahoo.com.au> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Resolution|---                         |FIXED
             Status|NEW                         |RESOLVED

--- Comment #18 from Timothy Arceri <t_arceri@yahoo.com.au> ---
Original bug was fixed as per comment 14 and comment 16. Please open new bug
reports for any further issues. Closing as fixed.

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