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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 - LLD segfaults when linking the Aarch64 Linux kernel with ThinLTO"
href="https://bugs.llvm.org/show_bug.cgi?id=44277">44277</a>
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<th>Summary</th>
<td>LLD segfaults when linking the Aarch64 Linux kernel with ThinLTO
</td>
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<th>Product</th>
<td>new-bugs
</td>
</tr>
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<th>Version</th>
<td>trunk
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Linux
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>normal
</td>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>new bugs
</td>
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<th>Assignee</th>
<td>vsk@apple.com
</td>
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<th>Reporter</th>
<td>samitolvanen@google.com
</td>
</tr>
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<th>CC</th>
<td>htmldeveloper@gmail.com, llvm-bugs@lists.llvm.org, ndesaulniers@google.com, ruiu@google.com, tejohnson@google.com
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<pre>Starting with commit 30038da15b18ac4e34b9ea7a648382ae481e4770 ("[DWARF] Allow
cross-CU references of subprogram definitions"), building the Linux kernel with
ThinLTO and LLD fails with a segmentation fault:
...
LTO vmlinux.o
Stack dump:
0. Running pass 'Function Pass Manager' on module
'arch/arm64/built-in.a(kernel/time.o at 4094)'.
1. Running pass 'AArch64 Assembly Printer' on function '@time_init'
LLVM ERROR: Failed to rename temporary file .thinlto-cache/Thin-d28bbb.tmp.o to
.thinlto-cache/llvmcache-C22016E1D1853F1DBC0C29919ED2F9B7CDF8E084: No such file
or directory
LLVM ERROR: Failed to rename temporary file .thinlto-cache/Thin-d9b995.tmp.o to
.thinlto-cache/llvmcache-BE7211A526D6D732AC88F1C1BCEC23592806F256: No such file
or directory
LLVM ERROR: Failed to rename temporary file .thinlto-cache/Thin-99c344.tmp.o to
.thinlto-cache/llvmcache-C7FECFD0C0C51CF353CF7961D21F44C1A8E02A6A: No such file
or directory
scripts/link-vmlinux.sh: line 71: 100211 Segmentation fault ${LD}
${KBUILD_LDFLAGS} -r -o ${1} $(lto_lds) ${objects}
make: *** [Makefile:1136: vmlinux] Error 139
Steps to reproduce:
$ git clone <a href="https://github.com/samitolvanen/linux.git">https://github.com/samitolvanen/linux.git</a>
$ cd linux
$ git checkout clang-lto
$ make ARCH=arm64 CROSS_COMPILE=aarch64-linux-gnu- CC=clang LD=ld.lld
defconfig
$ ./scripts/config -e LTO_CLANG -e THINLTO
$ make ARCH=arm64 CROSS_COMPILE=aarch64-linux-gnu- CC=clang LD=ld.lld -j110
I've confirmed that reverting commit 30038da15b18ac4e34b9ea7a648382ae481e4770
fixes the issue.
Note that not passing --thinlto-cache-dir to LLD removes the "Failed to rename
temporary file" errors, but still results in a segfault.</pre>
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