<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/96018>96018</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            Clang-19 crashed: Assertion `isa<To>(Val) && "cast<Ty>() argument of incompatible type!"' failed.
        </td>
    </tr>

    <tr>
      <th>Labels</th>
      <td>
            new issue
      </td>
    </tr>

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

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

<pre>
    Clang-19 with the attribute `interrupt` enabled.

Compiler explorer(assertion trunck): https://godbolt.org/z/5xPr7ob1M

```
$cat mutant.c
__attribute__((interrupt)) void a(void()) {}

$clang-19 mutant.c
mutant.c:1:40: warning: omitting the parameter name in a function definition is a C23 extension [-Wc23-extensions]
    1 | __attribute__((interrupt)) void a(void()) {}
      | ^
clang: /root/llvm-project/llvm/include/llvm/Support/Casting.h:566: decltype(auto) llvm::cast(const From&) [with To = clang::PointerType; From = clang::QualType]: Assertion `isa<To>(Val) && "cast<Ty>() argument of incompatible type!"' failed.
PLEASE submit a bug report to https://github.com/llvm/llvm-project/issues/ and include the crash backtrace, preprocessed source, and associated run script.
Stack dump:
0. Program arguments: /usr/lib/llvm-19/bin/clang -cc1 -triple x86_64-pc-linux-gnu -emit-obj -mrelax-all -dumpdir a- -disable-free -clear-ast-before-backend -disable-llvm-verifier -discard-value-names -main-file-name mutant.c -mrelocation-model pic -pic-level 2 -pic-is-pie -mframe-pointer=all -fmath-errno -ffp-contract=on -fno-rounding-math -mconstructor-aliases -funwind-tables=2 -target-cpu x86-64 -tune-cpu generic -debugger-tuning=gdb -fdebug-compilation-dir=/root/code/my_code/diff_coverage/combine_test/case_reduce -fcoverage-compilation-dir=/root/code/my_code/diff_coverage/combine_test/case_reduce -resource-dir /usr/lib/llvm-19/lib/clang/19 -internal-isystem /usr/lib/llvm-19/lib/clang/19/include -internal-isystem /usr/local/include -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/9/../../../../x86_64-linux-gnu/include -internal-externc-isystem /usr/include/x86_64-linux-gnu -internal-externc-isystem /include -internal-externc-isystem /usr/include -ferror-limit 19 -fgnuc-version=4.2.1 -fskip-odr-check-in-gmf -fcolor-diagnostics -faddrsig -D__GCC_HAVE_DWARF2_CFI_ASM=1 -o /tmp/mutant-2667de.o -x c mutant.c
1.      <eof> parser at end of file
2.      Code generation
3.      Running pass 'Function Pass Manager' on module 'mutant.c'.
4.      Running pass 'X86 DAG->DAG Instruction Selection' on function '@a'
#0 0x00007ff7bcbf7216 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/usr/lib/llvm-19/bin/../lib/libLLVM.so.19.0+0xdc1216)
#1 0x00007ff7bcbf4ec0 llvm::sys::RunSignalHandlers() (/usr/lib/llvm-19/bin/../lib/libLLVM.so.19.0+0xdbeec0)
#2 0x00007ff7bcbf78f0 (/usr/lib/llvm-19/bin/../lib/libLLVM.so.19.0+0xdc18f0)
#3 0x00007ff7c75e6980 __restore_rt (/lib/x86_64-linux-gnu/libpthread.so.0+0x12980)
#4 0x00007ff7bcc48923 (/usr/lib/llvm-19/bin/../lib/libLLVM.so.19.0+0xe12923)
#5 0x000055eba94d2cc0 
clang-19: error: unable to execute command: Segmentation fault (core dumped)
clang-19: error: clang frontend command failed due to signal (use -v to see invocation)
Ubuntu clang version 19.0.0 (++20240301064251+dd426fa5f931-1~exp1~20240301184412.1845)
Target: x86_64-pc-linux-gnu
Thread model: posix
InstalledDir: /usr/lib/llvm-19/bin
clang-19: note: diagnostic msg: 
********************

PLEASE ATTACH THE FOLLOWING FILES TO THE BUG REPORT:
Preprocessed source(s) and associated run script(s) are located at:
clang-19: note: diagnostic msg: /tmp/mutant-db5637.c
clang-19: note: diagnostic msg: /tmp/mutant-db5637.sh
clang-19: note: diagnostic msg: 

********************
```
</pre>
<img width="1px" height="1px" alt="" src="http://email.email.llvm.org/o/eJy8WF9z2zgO_zTMC4YeiZIl-SEPjh23nUmvuca7e28eioRkbiVSQ1Kpcw_72W9IKU6apru9be8yHkcEIeAHEP9o7pxqNeIlWV6R5faCj_5o7KXiPddGP_RmdMJd1EY-XG46rluaruCz8kfwRwTuvVX16BFIkSjt0dpx8KRIADWvO5QLkmxJsp6-N6YfVIcW8DR0xqIlrOLOofXKaPB21OITYSuSreHo_eBItiZsR9iuNbI2nV8Y2xK2-zdhu-Xp1pamTt8_l0-KZP5MS5YL7qEfPdd-ISbi4XDGfDgQVhFWPeFmK8JWcG-UBE5YFR4iSyST8oqU2y_0sVw8uuRLLedVtk5Jts6TYNNnbrXSbXg0vfJe6TY6ceCW9-jRguY9gtLAoRm1iF6R2Cit4qNywGHDMsCTR-0CiSyv6G-CZfRMcmQ5YwQASIGUG_g5NkP8C_LI8noiReuDPYTtrDGesF3X3fd0sOZ3FI9LwnZKi26U-ES4G4fB2MCx4S54YnEk2XpZFEGaRNH5hwFDeIzeBCDxtWxNsrXgzhNWCaOdh501PWFFhLq8imG5N0CyLTxCI9n61kRr90FidhXfecnyz5F3cX-5DQDW56AMYe04yTZ7Q7JrwqpfeRe1BaUFEMYinmyzf5j2wya37dij9mAaUFqYfuBe1R3CZFRKGCOshIarpwy5vble312DG-teeeBQjy1YDD4Cb16mg_LHsV6IYPujQ1_4XTk3oiNsB1xLmN0fo01Y7o5Qc_HJWy6QsA0MFgdrBDqHEpwZ7UQOb3LnjFDcowQ7anDCqsHPkO88F59Ajv0QkEVSsoBba1rL-7MT3Bwfo7MBpqofwaYrwna10oTt4kkAFSIF6q0aOoRTVRyKnA6CdkqPJ9rqESj2ylNT_w60t9jxE-VdBzQgkMoCp0ClcqHu0MYiAhUdcku587TGxlikwWzU8okvIrlHqxqFNpIFt5Le825EGtLRAe250rRR3UQ4Z_oEwggeAoX2RmIHgxJAByVoh_fYAZsWytFBIdC-CYlOhykeSbaN8Jue-yNFa7UB2jQDFUaHo_Ek2xoNtNGGWjNqqXRLAy_QPka_HYU3lvJOcRdwNqP-rLSkPljmSLZlQD23LXoqhjF4lBY5UD9qjIQWNdoAWGI9ti3asBUL1LaVNdAm0qmIVXuyUqoA-ynbhYlJ3T8c5iepmuYgzD1a3mJk6Gul8eDRRX7u8GBRjgKBNo98_zsVFqdwDlK_HYTTeioHbJeugMYD0ryjyj04j_33v_tU7P5UihGhjnwXa1TQCkHYbk6Kc0YQtgsKF4uvv15h_VpZ6BpWi6-VPtXrl3L-_O3_XgXQBq01lnYqFL7g_KbVowhJGfoZybb5gi1SoI37pAZqpKXiiOITVZq2fRPDqDOWSsVbbZxXIqQCl9I61QLdHg5vNpvD2_Wv14ftb-uPO3bY7N4d1nfvSbZNgZqAyPdDCLGY2JQVRSlxYYCeQLzo6-li7oLZBk1DsuvQvB1a4B5CXTENhEIxMbOZeWMkTskWI3zazObNj6MOOQcDdw4IK3ePjf82EN5zzdswJ5VgNPRGjh0GrjMqVs7FOP-GvH9VBWzXbyjJrrfrN_BurhtBwx12GJ9m8eeZg7CS5AkP_-Y5J0sgOSVJkpRNU9aibkqWFs-asntwc6-1SvvYGPZTd6memCz_fDDOW-RTz96A0n5qptVfNIgY0vOWqm9ufn2_cGaRrhYJYVfJSYqUpWEKOONNX-DNUSSv4f046jvVat695Vp2aN3cwn8cUo0okueQ2EsXVk3yU0yvmi_0ZM_0iHKJxapK4HCw6LyxeLB-VjrJfKVOdKoe_NEil0HTpCZlq-oLLfkX1oi8WrHsx63BlK1Y9lzPctazXGLNV7lkQiTwbPoMwrM1xBoSHsZ47wgzE55QhJuJMH3PtQybd9iGkSSmITR87KIvhLEYxxiUZ82vyp7GlMYa7UOyz4LnOQ7kGNW6GE5B7ugQ6H2kYRjr7-dZ4azkl3rUfpzFzvUOgi8Wc2BcEXbFEpYnWZImRc6WKWFXUuasaPiyWWUpTf_A05D-8ciUVnmeskVa5cuzln0cAQL-V2aqmSWeNsQZJjAOxqnTtBUKBu86lFtl_3KS-8p12niME_25OEPvphvDfMA_8Hl2E5un5_V-v968hf3ba9h9uLn58Nu7f7yB3bub6zvYf4jkq1_ewMfr2w8f9-eZ9fa16bdycZD_1gR8ZrAIcQRECdyfRX6nC140Hlkvi6x8bDU_JMMd_8ZZ_KwTebyFX8jLTK6yFb_Ay7RMq7KoVnlycQwLLBNMyyRliMu8SJa5qBNR1GlV50l2oS5jQBfpKsnyVZIsUr7KCkxLxLKuypUgeYI9V90ixN_C2PYiXnguV0WSVhcdr7Fz8QcNxjR-hrgZbl3L7YW9jDFbj60jedIp592TFK98h0-_c8S7Esr_-5XwYrTd5d-_801euL9k_wkAAP__9viHUw">