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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - [ubsan] Consider not instrumenting volatile loads and stores with null checks"
href="https://bugs.llvm.org/show_bug.cgi?id=33081">33081</a>
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<th>Summary</th>
<td>[ubsan] Consider not instrumenting volatile loads and stores with null checks
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<th>Product</th>
<td>compiler-rt
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<th>Version</th>
<td>unspecified
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<th>Hardware</th>
<td>PC
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<th>OS</th>
<td>Windows NT
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<th>Status</th>
<td>NEW
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<th>Severity</th>
<td>enhancement
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<th>Priority</th>
<td>P
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<th>Component</th>
<td>compiler-rt
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
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<th>Reporter</th>
<td>rnk@google.com
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<th>CC</th>
<td>llvm-bugs@lists.llvm.org
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<p>
<div>
<pre>The idea behind volatile is that accessing the memory in question has some
implementation-defined semantics and side effects. Using volatile is
essentially a request to get the behavior of the current implementation,
whatever it may be, such as trapping to the signal handler or loading from
memory that's actually mapped at zero.
This came up with I added LLVM's CrashRecoveryContext tests, which
intentionally dereference null. It's actually interesting to test SIGSEGV
separately from testing SIGILL, which is what __builtin_trap would normally
raise.</pre>
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