<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/114571>114571</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            clangd: language server crashing, std::bad_array_new_length
        </td>
    </tr>

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

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

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

<pre>
    I suddenly started having clangd constanstly crashing on me even on a clean directory without any special setups. I do not recall doing anything special or changing anything.

```c
int main(int argc, char* argv[]) {
 if (argc < 2) {
        return 0;
    }
    
    return 0;
}
```

```
I[16:47:18.853] Ubuntu clangd version 20.0.0 (++20241030081643+f3584222682b-1~exp1~20241030081752.508)
I[16:47:18.853] Features: linux+grpc
I[16:47:18.853] PID: 883
I[16:47:18.854] Working directory: /developement/test_clangd
I[16:47:18.854] argv[0]: /usr/bin/clangd
I[16:47:18.854] argv[1]: --function-arg-placeholders=0
I[16:47:18.854] argv[2]: --header-insertion=never
I[16:47:18.854] argv[3]: --rename-file-limit=0
I[16:47:18.854] Starting LSP over stdin/stdout
I[16:47:18.854] <-- initialize(0)
I[16:47:18.855] --> reply:initialize(0) 0 ms
I[16:47:18.856] <-- initialized
I[16:47:18.857] <-- textDocument/didOpen
I[16:47:18.859] --> textDocument/publishDiagnostics
I[16:47:18.859] Failed to find compilation database for /developement/test_clangd/source.c
I[16:47:18.859] ASTWorker building file /developement/test_clangd/source.c version 1 with command clangd fallback
[/developement/test_clangd]
/usr/lib/llvm-20/bin/clang -resource-dir=/usr/lib/clang/20 -- /developement/test_clangd/source.c
I[16:47:18.860] --> textDocument/clangd.fileStatus
I[16:47:18.869] Built preamble of size 294440 for file /developement/test_clangd/source.c version 1 in 0.01 seconds
I[16:47:18.869] --> workspace/semanticTokens/refresh(0)
I[16:47:18.870] <-- reply(0)
I[16:47:18.871] <-- textDocument/documentSymbol(1)
I[16:47:18.871] <-- textDocument/documentLink(2)
I[16:47:18.871] <-- textDocument/codeAction(3)
I[16:47:18.875] --> textDocument/publishDiagnostics
I[16:47:18.875] --> textDocument/inactiveRegions
terminate called after throwing an instance of 'std::bad_array_new_length'
  what(): std::bad_array_new_length
PLEASE submit a bug report to https://github.com/llvm/llvm-project/issues/ and include the crash backtrace.
I[16:47:18.877] <-- textDocument/semanticTokens/full(4)
I[16:47:19.060] <-- textDocument/foldingRange(5)
I[16:47:19.060] --> reply:textDocument/foldingRange(5) 0 ms
I[16:47:19.145] <-- textDocument/documentSymbol(6)
 #0 0x00007fa8fc094d8f llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/lib/x86_64-linux-gnu/libLLVM.so.20.0+0xfd8d8f)
 #1 0x00007fa8fc092a99 llvm::sys::RunSignalHandlers() (/lib/x86_64-linux-gnu/libLLVM.so.20.0+0xfd6a99)
 #2 0x00007fa8fc0954a0 (/lib/x86_64-linux-gnu/libLLVM.so.20.0+0xfd94a0)
 #3 0x00007fa8fa21f320 (/lib/x86_64-linux-gnu/libc.so.6+0x45320)
 #4 0x00007fa8fa278b1c __pthread_kill_implementation ./nptl/pthread_kill.c:44:76
 #5 0x00007fa8fa278b1c __pthread_kill_internal ./nptl/pthread_kill.c:78:10
 #6 0x00007fa8fa278b1c pthread_kill ./nptl/pthread_kill.c:89:10
 #7 0x00007fa8fa21f26e raise ./signal/../sysdeps/posix/raise.c:27:6
 #8 0x00007fa8fa2028ff abort ./stdlib/abort.c:81:7
 #9 0x00007fa8fa5a8ff5 __gnu_cxx::__verbose_terminate_handler() /build/gcc-14-ig5ci0/gcc-14-14.2.0/build/x86_64-linux-gnu/libstdc++-v3/libsupc++/../../../../src/libstdc++-v3/libsupc++/vterminate.cc:75:10
#10 0x00007fa8fa5be0da __cxxabiv1::__terminate(void (*)()) /build/gcc-14-ig5ci0/gcc-14-14.2.0/build/x86_64-linux-gnu/libstdc++-v3/libsupc++/../../../../src/libstdc++-v3/libsupc++/eh_terminate.cc:48:15
#11 0x00007fa8fa5a8a55 std::unexpected() /build/gcc-14-ig5ci0/gcc-14-14.2.0/build/x86_64-linux-gnu/libstdc++-v3/libsupc++/../../../../src/libstdc++-v3/libsupc++/eh_terminate.cc:71:1
#12 0x00007fa8fa5be391 (/lib/x86_64-linux-gnu/libstdc++.so.6+0xbb391)
#13 0x00007fa8fa5ac111 std::__throw_bad_cast() /build/gcc-14-ig5ci0/gcc-14-14.2.0/build/x86_64-linux-gnu/libstdc++-v3/src/c++11/../../../../../src/libstdc++-v3/src/c++11/functexcept.cc:62:3
#14 0x0000562375535217 (/usr/bin/clangd+0x369217)
#15 0x0000562375513ead (/usr/bin/clangd+0x347ead)
#16 0x0000562375514443 (/usr/bin/clangd+0x348443)
#17 0x00005623757ae700 (/usr/bin/clangd+0x5e2700)
#18 0x000056237565df94 (/usr/bin/clangd+0x491f94)
#19 0x000056237565d71a (/usr/bin/clangd+0x49171a)
#20 0x0000562375659f8e (/usr/bin/clangd+0x48df8e)
#21 0x0000562375659b2b (/usr/bin/clangd+0x48db2b)
#22 0x00005623757c2981 (/usr/bin/clangd+0x5f6981)
#23 0x00007fa8fa276a94 start_thread ./nptl/pthread_create.c:447:8
#24 0x00007fa8fa303c3c clone3 ./misc/../sysdeps/unix/sysv/linux/x86_64/clone3.S:80:0
Signalled during AST worker action: Build AST
  Filename: source.c
  Directory: /developement/test_clangd
  Command Line: /usr/lib/llvm-20/bin/clang -resource-dir=/usr/lib/clang/20 -- /developement/test_clangd/source.c
 Version: 1
```
</pre>
<img width="1px" height="1px" alt="" src="http://email.email.llvm.org/o/eJzUmVtv47gVgH8N80JY4EXXBz84kzU6QIoOJtPto0FRRzYbmjJIyon3YX97QcqxLSe2s7Mtih0MDF3IT4fnTkY4p5YGYIqye5Q93Inerzo77TSsxa6_q7tmN_2KXd80YPQOOy-shwavxFaZJZZamGWDZWecF8Z5vcPSCrcK7zqD14BhCyZcCiw1CIMbZUH6zu7wi_KrrvdYmB12G5BKaOzA9xuX4K-46bDpPLYghda46QJRmJ2P6LfhncVyJczy9GWCyAMis_1vTob_crhXxuO1UAaxMlwKu5SIfQkQi9gs3G8HPSBWYVTcD7OwajFiZRiNEf-C2fjt_p8F31uDCeInL1DxcHJzuHo39jDuIPGHyxhuv6LsnuaIz9IC8RktkzLjKHvA_6x74_s3o2zBOtUZzEhCEhIWgNg9YveMsJQSTkhJ85Qjdt_yrEwZY3nJ6gn9HV439PeTQUXGkoyUiFXXvz4H4XsLDvEZ1sr0r4jdL-1GXp_17etDmFCW_OK4NIz7V2efg5kP_hNmITZvYAu628AajEds7sH5xaCA67y9qUmw9UDqnUVsXgfnmP8BAt0TJpO2N9KrzkyEXU42WkhYdboB6xB_uGy5UxY7sFYgGrATZRzYwET8wcAW7Kcw_ICxYMQaJq3SMNFqrfxtUZ5ChAdNPz59w90WLHa-iUpxvul6f3024l8mE6yM8kpo9RsgVpJrnpOFSZMJ4r9gCxsdrPpuMiZ47S4S8o8-e9l0xXG4h1f_0Ml-7zqNav6xAXNxZnUU9Wzmpq-1cqsHJZamc17Jy9JGyFwoDQ32HW6VCdlzvVFaBDPjRnhRCwe47ewN92Zz1_VWQnI5wuLXZk8_QvCAxXWvdBNMG_zh0_RDIqExZQdx1yKIPaSZVmhdC_m8z1TZ_XVu9pbn3gJOqzr86u16wsg4APHEwiDFpFEW8YezSXEQYnNG8GTyp7WVk4sGHhhJUNuTF76_aN88avy-V9rjjQWxrjXgrsVO_QaYVWmakmjZnzWAMpgkhGIHsjPNDTGGpbx09tlthIRAhLUwXskf3TMYh9jcQmvBrW5EaUGOQTNE6Y3x9HKQ7S-fduu604iV9M9xHpV5RqxkP0eRXQOzmLMRK_k1RvZfCP4rEGWE9GoL32GpOrMneLBrZYQHHHogaLBoPVjsV7Z7GToerGLfJaOPIVY43yA-Q3xWi2YhrBW7hYGXhQaz9CvEircG5GUlfOwHqlAmrs-KU749_jJ7-gW7vl4rjwWu-2XwhM76kMVW3m9C2Udsjth8qfyqrxPZrfdx_RbeG9v9G2RcrnM9BP_DIZEoI3XfAPYrGLpHHPKJt0JCclGXl_P4Oydvex08Lb1k3yohObmIa7uYM78LswwFKbtJGVez27TL5a1KaJp9PpTyg2gYMU4weSWEkKIVZStJlTZli6M5oq3dzg0X36wy_skL-fzDxixRHgdZ8bLonA-JDLE8dMoqfLoamsl9Fn4t80WeTmLLN1mafnjx-Pjr3xPXJaH7ROyevLZN2ZTtSER6JiITVfWRiN9786SWRui_CdPo0FBF3_05KXJRVSMp2JkUWSrIz6GrVJARmp-iBaMtZ59By8DNIzTNOBsz0zGzKGsq8WKx8SsLolk8K60Xar3RsaYMTUWC2NxsvA7Z6mRYIoOnpYjPivzIzz7DNx6sEfoquSiDD5MjOf-IfDrtKq6sznDFuXJZDtgK5SByXPQYxOZJvNu5BjYhG2w6p15D6QsjI5mFYDvRQDkGE1a2LRZ1SHbJ0AYPxouPBtloWO-RUI0ImSjbNsOLxdL0C_n6Ojj1YrEFW3cOFoc8v1gN_n1w73ns2EJOlXJC04laZlKR4z1NE5aQk3Ef-5PzjRz2fpMt3z_qN_tHbxo6-3FWfm7y9iB-IqPZsxM7hSAnY2XUQBqBF0ERolZb-qaNAwaxctupZoiTWfD9oVL9ZTQCq8WZTtIYCtlRJ_TcQUSWHetwb-B1A9JD85fyhPfrLoJ16XHZ7NwVeEU_kQ-PHz4mxrrm1bF3DHB-plNJKT3qdLGIfdMi9DhSOP-_1uygtf0jSi_o9rqC3zPiEQO8Stj4QcM5Q3zGj0p4qw5ZzniRZTxjtNhr-IPzjaBInleMFiNNZmMI5SCaG5C0ANGMIPkZJE1TfgtSpikfQYoRpBBQEHIdkgErCBlByhEkz5q2Sq9D0oq2VTqCVOeQgoqbkIKKUwgjZ5CqLeEGpGzaEkYQeg6pWX0TUrN6BGFjxUpWlfSGYtu8KkcRx87amyIXVTqcEC-G6v1RQZcWYn6IvUeovOUROO5tOOGSSyx1Z4BH1Fo5-b6i9yYWdLdz2xhH8ehxH6ZxDWF-8hQ-RRCf7UvT0FGGbVXT27Cdmj39iJtlsFgMe0I-i1v5Jrx62zrNlY5nanHjNDpRwPjhD55NYvxlf5byqAyMjiH_T6ci-NfhqCHIQs_Onu-aKW8qXok7mNKCk7QktEzvVtOGlbRK04JCUWQky9uKtRIgIymFRmT5nZrG42RKKM2DwyVVlmV52bJc1Glb8gylBNZC6SQsOOns8i7uEKeUpllB77SoQbu3v1DYaVRL3S8dSolWzrvjPK-8hul-dXyGw0UvloAd2C3Yw18nwl7m6r73rrd6-vMb273k2yn7TwAAAP__XrFIqQ">