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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Assertion `!NodePtr->isKnownSentinel()' failed [regression, AMDGPU]"
href="https://llvm.org/bugs/show_bug.cgi?id=30514">30514</a>
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<th>Summary</th>
<td>Assertion `!NodePtr->isKnownSentinel()' failed [regression, AMDGPU]
</td>
</tr>
<tr>
<th>Product</th>
<td>libraries
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
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<th>OS</th>
<td>Linux
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>Common Code Generator Code
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>vedran@miletic.net
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr>
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>The Talos Principle crashes on AMDGPU with:
Talos: /home/vedranm/workspace/llvm/include/llvm/ADT/ilist_iterator.h:126:
llvm::ilist_iterator<OptionsT, IsReverse, IsConst>::reference
llvm::ilist_iterator<OptionsT, IsReverse, IsConst>::operator*() const [with
OptionsT = llvm::ilist_detail::node_options<llvm::MachineInstr, true, true,
void>; bool IsReverse = false; bool IsConst = true;
llvm::ilist_iterator<OptionsT, IsReverse, IsConst>::reference = const
llvm::MachineInstr&]: Assertion `!NodePtr->isKnownSentinel()' failed.
6037e199c8a061b2e9cb22c434644a0eac659fb9 is the first bad commit
commit 6037e199c8a061b2e9cb22c434644a0eac659fb9
Author: Duncan P. N. Exon Smith <<a href="mailto:dexonsmith@apple.com">dexonsmith@apple.com</a>>
Date: Sun Sep 11 16:38:18 2016 +0000
CodeGen: Turn on sentinel tracking for MachineInstr iterators
This is a prep commit before fixing MachineBasicBlock::reverse_iterator
invalidation semantics, ala r281167 for ilist::reverse_iterator. This
changes MachineBasicBlock::Instructions to track which node is the
sentinel regardless of LLVM_ENABLE_ABI_BREAKING_CHECKS.
There's almost no functionality change (aside from ABI). However, in
the rare configuration:
#if !defined(NDEBUG) && !defined(LLVM_ENABLE_ABI_BREAKING_CHECKS)
the isKnownSentinel() assertions in ilist_iterator<>::operator* suddenly
have teeth for MachineInstr. If these assertions start firing for your
out-of-tree backend, have a look at the suggestions in the commit
message for r279314, and at some of the commits leading up to it that
avoid dereferencing the end() iterator.
git-svn-id: <a href="https://llvm.org/svn/llvm-project/llvm/trunk@281168">https://llvm.org/svn/llvm-project/llvm/trunk@281168</a>
91177308-0d34-0410-b5e6-96231b3b80d8</pre>
</div>
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