<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/94716>94716</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            lld crash with Wl,-fixup_chains when build  ios 
        </td>
    </tr>

    <tr>
      <th>Labels</th>
      <td>
            lld
      </td>
    </tr>

    <tr>
      <th>Assignees</th>
      <td>
      </td>
    </tr>

    <tr>
      <th>Reporter</th>
      <td>
          liudikang
      </td>
    </tr>
</table>

<pre>
    ## What did you do?
First we build a go project with gomobile (https://github.com/xxf098/go-tun2socks-build) as a static library,
then linker this static library into our IOS project.

What did you see happen?
lld crashed.

I found crash position of lld:

`SymtabSectionImpl<LP>::writeTo` of file `lld/MachO/SyntheticSections.cpp`
Crashed on this line: `nList->n_sect = defined->isec()->parent->index;`

After we remove ldflags "-Wl,-fixup_chains" ,or modify llvm code crash not happed.


this is crash stack (this lld is build by myself,prebuild is same)
```
 #0 0x0000000104b0d454 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/xxxxx/third_party/llvm-build/Release+Asserts/bin/lld+0x1000fd454)
 #1 0x0000000104b0b664 llvm::sys::RunSignalHandlers() (/xxxxx/third_party/llvm-build/Release+Asserts/bin/lld+0x1000fb664)
 #2 0x0000000104b0db10 SignalHandler(int) (/xxxxx/third_party/llvm-build/Release+Asserts/bin/lld+0x1000fdb10)
 #3 0x000000019c48b584 (/usr/lib/system/libsystem_platform.dylib+0x180477584)
 #4 0x0000000104e17154 SymtabSectionImpl<lld::macho::LP64>::writeTo(unsigned char*) const (/xxxxx/third_party/llvm-build/Release+Asserts/bin/lld+0x100407154)
 #5 0x0000000104a948b8 std::__1::__function::__func<llvm::parallelFor(unsigned long, unsigned long, llvm::function_ref<void (unsigned long)>)::$_1, std::__1::allocator<llvm::parallelFor(unsigned long, unsigned long, llvm::function_ref<void (unsigned long)>)::$_1>, void ()>::operator()() (/xxxxx/third_party/llvm-build/Release+Asserts/bin/lld+0x1000848b8)
 #6 0x0000000104a947d0 std::__1::__function::__func<llvm::parallel::TaskGroup::spawn(std::__1::function<void ()>, bool)::$_0, std::__1::allocator<llvm::parallel::TaskGroup::spawn(std::__1::function<void ()>, bool)::$_0>, void ()>::operator()() (/xxxxx/third_party/llvm-build/Release+Asserts/bin/lld+0x1000847d0)
 #7 0x0000000104a93270 llvm::parallel::detail::(anonymous namespace)::ThreadPoolExecutor::work(llvm::ThreadPoolStrategy, unsigned int) (/xxxxx/third_party/llvm-build/Release+Asserts/bin/lld+0x100083270)
 #8 0x0000000104a92fac void* std::__1::__thread_proxy[abi:un170006]<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct>>, llvm::parallel::detail::(anonymous namespace)::ThreadPoolExecutor::ThreadPoolExecutor(llvm::ThreadPoolStrategy)::'lambda'()>>(void*) (/xxxxx/third_party/llvm-build/Release+Asserts/bin/lld+0x100082fac)
 #9 0x000000019c45af94 (/usr/lib/system/libsystem_pthread.dylib+0x180446f94)
```


</pre>
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