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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - DEBUG output in InstructionCombining.cpp causing seg fault"
href="https://llvm.org/bugs/show_bug.cgi?id=25983">25983</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>DEBUG output in InstructionCombining.cpp causing seg fault
</td>
</tr>
<tr>
<th>Product</th>
<td>new-bugs
</td>
</tr>
<tr>
<th>Version</th>
<td>unspecified
</td>
</tr>
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<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>Keywords</th>
<td>compile-fail
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
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<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>paulsson@linux.vnet.ibm.com
</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>Created <span class=""><a href="attachment.cgi?id=15539" name="attach_15539" title="clang input">attachment 15539</a> <a href="attachment.cgi?id=15539&action=edit" title="clang input">[details]</a></span>
clang input
InstructionCombining is outputting a new instruction to dbgs(), without the new
instruction having been insterted into BB. The result is that an AssemblyWriter
is created with a null TheModule pointer.
A seg fault is caused by the supplied test case.
run:
clang -cc1 -triple s390x-ibm-linux-gnu -S -disable-free -main-file-name
ckd_alloc.c -mrelocation-model static -mthread-model posix -fmath-errno
-masm-verbose -mconstructor-aliases -fuse-init-array -target-cpu z13
-target-linker-version 2.25 -momit-leaf-frame-pointer -dwarf-column-info
-debugger-tuning=gdb -O3 -ferror-limit 19 -fmessage-length 0 -funroll-loops
-fobjc-runtime=gcc -fdiagnostics-show-option -vectorize-loops -vectorize-slp
-mllvm -debug -o ckd_alloc.s -x ir ckd_alloc.bc</pre>
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