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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - SalvageDebugInfo crash when using -debug (in bitTrackingDCE)"
href="https://bugs.llvm.org/show_bug.cgi?id=38924">38924</a>
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<th>Summary</th>
<td>SalvageDebugInfo crash when using -debug (in bitTrackingDCE)
</td>
</tr>
<tr>
<th>Product</th>
<td>new-bugs
</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>enhancement
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>new bugs
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>david.stenberg@ericsson.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=20873" name="attach_20873" title="IR reproducer.">attachment 20873</a> <a href="attachment.cgi?id=20873&action=edit" title="IR reproducer.">[details]</a></span>
IR reproducer.
Reproduced on trunk (rL342000).
When running the following opt command on the attached IR reproducer:
opt -bdce -o /dev/null bdce.ll -debug
you get a crash due to using isa<> on a null pointer when printing the debug
value:
Args: opt -bdce -o /dev/null bdce.ll -debug
discovered a new reachable node %entry
discovered a new reachable node %entry
discovered a new reachable node %entry
DemandedBits: Root: call void @llvm.dbg.value(metadata i32 %or248,
metadata !6, metadata !DIExpression()), !dbg !8
DemandedBits: Root: ret void
SALVAGE: call void @llvm.dbg.value(metadata i32 123, metadata opt:
../include/llvm/Support/Casting.h:92: static bool
llvm::isa_impl_cl<llvm::Function, llvm::Value *>::doit(const From *) [To =
llvm::Function, From = llvm::Value *]: Assertion `Val && "isa<> used on a null
pointer"' failed.
Stack dump:
0. Program arguments: opt -bdce -o /dev/null bdce.ll -debug
1. Running pass 'Function Pass Manager' on module 'bdce.ll'.
2. Running pass 'Bit-Tracking Dead Code Elimination' on function '@bar'</pre>
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