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LCSSA code crash on unreachable block. #1349

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llvmbot opened this issue Oct 31, 2006 · 5 comments
Closed

LCSSA code crash on unreachable block. #1349

llvmbot opened this issue Oct 31, 2006 · 5 comments
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@lattner
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bugzilla Issues migrated from bugzilla compile-fail Use [accepts-invalid] and [rejects-valid] instead

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@llvmbot
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llvmbot commented Oct 31, 2006

Bugzilla Link 977
Resolution FIXED
Resolved on Feb 22, 2010 12:48
Version trunk
OS All
Attachments Test case reduced from net/network.o from Linux 2.4.22
Reporter LLVM Bugzilla Contributor

Extended Description

When run on the attached test case, the opt tool crases from a SEGFAULT.
Initial investigation shows that LCSSA::GetValueForBlock is being passed a NULL
pointer for the BB operand and attempts to dereference it.
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llvmbot commented Oct 31, 2006

assigned to @lattner

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lattner commented Oct 31, 2006

Fixed, patch here:
http://lists.cs.uiuc.edu/pipermail/llvm-commits/Week-of-Mon-20061030/039276.html

Testcase here:
Transforms/LCSSA/2006-10-31-UnreachableBlock.ll

Thanks,

-Chris

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llvmbot commented Oct 31, 2006

New testcase for similar problem
This is another testcase from the Linux 2.4.22 kernel (drivers/char/char.o).

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llvmbot commented Oct 31, 2006

Chris,

I believe the new testcase is another form of the same bug.

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lattner commented Oct 31, 2006

Fixed. Patch here:
http://lists.cs.uiuc.edu/pipermail/llvm-commits/Week-of-Mon-20061030/039278.html

Testcase here:
Transforms/LCSSA/2006-10-31-UnreachableBlock-2.ll

-Chris

@llvmbot llvmbot transferred this issue from llvm/llvm-bugzilla-archive Dec 3, 2021
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