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<base href="https://bugs.llvm.org/">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Crash when building Linux kernel’s multi_v5_defconfig’s kernel/trace/trace_clock.o"
href="https://bugs.llvm.org/show_bug.cgi?id=45335">45335</a>
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<th>Summary</th>
<td>Crash when building Linux kernel’s multi_v5_defconfig’s kernel/trace/trace_clock.o
</td>
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<th>Product</th>
<td>libraries
</td>
</tr>
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<th>Version</th>
<td>trunk
</td>
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<th>Hardware</th>
<td>Other
</td>
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<th>OS</th>
<td>All
</td>
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<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>enhancement
</td>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>Backend: ARM
</td>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>natechancellor@gmail.com
</td>
</tr>
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<th>CC</th>
<td>llvm-bugs@lists.llvm.org, smithp352@googlemail.com, Ties.Stuij@arm.com
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</tr></table>
<p>
<div>
<pre>With assertions enabled:
$ curl -LSs <a href="https://cdn.kernel.org/pub/linux/kernel/v5.x/linux-5.5.13.tar.xz">https://cdn.kernel.org/pub/linux/kernel/v5.x/linux-5.5.13.tar.xz</a> |
tar xJf -
$ cd linux-5.5.13
$ make -j$(nproc) -s ARCH=arm CC=clang CROSS_COMPILE=arm-linux-gnueabi-
O=out/arm32 distclean multi_v5_defconfig kernel/trace/trace_clock.o
fragment covers entire variable
!1079 = !DIGlobalVariableExpression(var: !1074, expr:
!DIExpression(DW_OP_LLVM_fragment, 0, 64))
!1074 = distinct !DIGlobalVariable(name: "trace_clock_struct", scope: !2, file:
!1057, line: 89, type: !1075, isLocal: true, isDefinition: true)
fatal error: error in backend: Broken module found, compilation aborted!
clang-11: error: clang frontend command failed with exit code 70 (use -v to see
invocation)
...
creduce spits out:
$ cat trace_clock.i
typedef struct {
} a;
static struct {
long b;
a c
} d;
e() {
long f = d.b + 1;
d.b = f;
}
$ clang —O2 —-target=arm-linux-gnueabi -march=armv5te -g -c -o /dev/null
trace_clock.i
fragment covers entire variable
!0 = !DIGlobalVariableExpression(var: !1, expr:
!DIExpression(DW_OP_LLVM_fragment, 0, 32))
!1 = distinct !DIGlobalVariable(name: "d", scope: !2, file: !3, line: 6, type:
!7, isLocal: true, isDefinition: true)
fatal error: error in backend: Broken module found, compilation aborted!
Full preprocessed source and interestingness test available at
<a href="https://github.com/nathanchance/creduce-files/tree/d09780fbcf83f4707527f6bf6e553c79ea43d5e4/multi_v5_defconfig-trace_clock-crash">https://github.com/nathanchance/creduce-files/tree/d09780fbcf83f4707527f6bf6e553c79ea43d5e4/multi_v5_defconfig-trace_clock-crash</a></pre>
</div>
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