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<base href="http://bugs.llvm.org/">
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<body><table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Segfaults when using --gc-sections with linker script"
href="http://bugs.llvm.org/show_bug.cgi?id=32024">32024</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>Segfaults when using --gc-sections with linker script
</td>
</tr>
<tr>
<th>Product</th>
<td>lld
</td>
</tr>
<tr>
<th>Version</th>
<td>unspecified
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
<tr>
<th>OS</th>
<td>All
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>release blocker
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>ELF
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>phosek@chromium.org
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>Bisecting revealed this was introduced in r295485, the test input to reproduce
this issue is:
# REQUIRES: x86
# RUN: llvm-mc -filetype=obj -triple=x86_64-unknown-linux %s -o %t
# RUN: echo "ENTRY(foo) \
# RUN: SECTIONS { \
# RUN: . = 0x1000; \
# RUN: .text : { *(.text*) }\
# RUN: }" > %t.script
# RUN: ld.lld %t --gc-sections --script %t.script -o %t1
# RUN: llvm-objdump -section-headers %t1 | FileCheck %s
# CHECK: Sections:
# CHECK-NEXT: Idx Name Size Address Type
# CHECK-NEXT: 0 00000000 0000000000000000
# CHECK-NEXT: 1 .text 00000002 0000000000000000
.section .text.bar
.global bar
bar:
nop
.section .text.foo
.global foo
foo:
nop
The stack trace is as follows:
#0 0x00000000004da869 llvm::sys::PrintStackTrace(llvm::raw_ostream&)
/usr/local/google/home/phosek/clang-llvm/llvm/out/lld/../../lib/Support/Unix/Signals.inc:402:11
#1 0x00000000004daa19 PrintStackTraceSignalHandler(void*)
/usr/local/google/home/phosek/clang-llvm/llvm/out/lld/../../lib/Support/Unix/Signals.inc:466:1
#2 0x00000000004d90e3 llvm::sys::RunSignalHandlers()
/usr/local/google/home/phosek/clang-llvm/llvm/out/lld/../../lib/Support/Signals.cpp:0:5
#3 0x00000000004dad74 SignalHandler(int)
/usr/local/google/home/phosek/clang-llvm/llvm/out/lld/../../lib/Support/Unix/Signals.inc:256:1
#4 0x00002b33c4c6b330 __restore_rt
(/lib/x86_64-linux-gnu/libpthread.so.0+0x10330)
#5 0x000000000071a7ae
lld::elf::LinkerScript<llvm::object::ELFType<(llvm::support::endianness)1,
true> >::switchTo(lld::elf::OutputSectionBase*)
/usr/local/google/home/phosek/clang-llvm/llvm/out/lld/../../tools/lld/ELF/LinkerScript.cpp:458:33
#6 0x000000000071aa10
lld::elf::LinkerScript<llvm::object::ELFType<(llvm::support::endianness)1,
true> >::process(lld::elf::BaseCommand&)
/usr/local/google/home/phosek/clang-llvm/llvm/out/lld/../../tools/lld/ELF/LinkerScript.cpp:503:48
#7 0x000000000071a2a6
lld::elf::LinkerScript<llvm::object::ELFType<(llvm::support::endianness)1,
true> >::assignOffsets(lld::elf::OutputSectionCommand*)
/usr/local/google/home/phosek/clang-llvm/llvm/out/lld/../../tools/lld/ELF/LinkerScript.cpp:0:5
#8 0x000000000071ae00
lld::elf::LinkerScript<llvm::object::ELFType<(llvm::support::endianness)1,
true> >::assignAddresses(std::vector<lld::elf::PhdrEntry,
std::allocator<lld::elf::PhdrEntry> >&)
/usr/local/google/home/phosek/clang-llvm/llvm/out/lld/../../tools/lld/ELF/LinkerScript.cpp:0:5
#9 0x000000000085d9bd (anonymous
namespace)::Writer<llvm::object::ELFType<(llvm::support::endianness)1, true>
<span class="quote">>::run()</span >
/usr/local/google/home/phosek/clang-llvm/llvm/out/lld/../../tools/lld/ELF/Writer.cpp:250:5
#10 0x00000000008869f2 void
lld::elf::writeResult<llvm::object::ELFType<(llvm::support::endianness)1, true>
<span class="quote">>()</span >
/usr/local/google/home/phosek/clang-llvm/llvm/out/lld/../../tools/lld/ELF/Writer.cpp:140:64
#11 0x00000000006337fa void
lld::elf::LinkerDriver::link<llvm::object::ELFType<(llvm::support::endianness)1,
true> >(llvm::opt::InputArgList&)
/usr/local/google/home/phosek/clang-llvm/llvm/out/lld/../../tools/lld/ELF/Driver.cpp:873:1
#12 0x0000000000624ae4 lld::elf::LinkerDriver::main(llvm::ArrayRef<char
const*>, bool)
/usr/local/google/home/phosek/clang-llvm/llvm/out/lld/../../tools/lld/ELF/Driver.cpp:340:5
#13 0x0000000000624266 lld::elf::link(llvm::ArrayRef<char const*>, bool,
llvm::raw_ostream&)
/usr/local/google/home/phosek/clang-llvm/llvm/out/lld/../../tools/lld/ELF/Driver.cpp:79:3
#14 0x00000000004b666e main
/usr/local/google/home/phosek/clang-llvm/llvm/out/lld/../../tools/lld/tools/lld/lld.cpp:104:12
#15 0x00002b33c5f08f45 __libc_start_main
/build/eglibc-oGUzwX/eglibc-2.19/csu/libc-start.c:321:0
#16 0x00000000004b6419 _start (../bin/ld.lld+0x4b6419)</pre>
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