<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/121704>121704</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            lto=full + address sanitizer results in free/delete errors
        </td>
    </tr>

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

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

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

<pre>
    clang version: 19

When compiling with lto=full and address sanitizer, I get weird errors:
```
$ ../bin/CoroutineTests
... program executes as normal ...
free(): invalid size
Aborted (core dumped)
```
```
$ ../bin/CoroutineTests_sdevent
... program executes as normal ...
munmap_chunk(): invalid pointer
Aborted (core dumped)
```
```
$ ../bin/AsyncFileIOTests
... program executes as normal ...
=================================================================
==3074019==ERROR: LeakSanitizer: detected memory leaks

Direct leak of 376 byte(s) in 1 object(s) allocated from:
    #0 0x3f2edd in operator new(unsigned long) crtstuff.c
    #1 0x6473c9 in Catch::Detail::unique_ptr<std::__cxx11::basic_ostringstream<char, std::char_traits<char>, std::allocator<char>>> Catch::Detail::make_unique<std::__cxx11::basic_ostringstream<char, std::char_traits<char>, std::allocator<char>>>() /home/githubrunner/actions-runner/_work/Ichor/Ichor/build/src/catch2/../catch2/internal/catch_unique_ptr.hpp:111:30
 #2 0x6473c9 in Catch::StringStreams::add() /home/githubrunner/actions-runner/_work/Ichor/Ichor/build/src/catch2/internal/catch_reusable_string_stream.cpp:26:38
 #3 0x6473c9 in Catch::ReusableStringStream::ReusableStringStream() /home/githubrunner/actions-runner/_work/Ichor/Ichor/build/src/catch2/internal/catch_reusable_string_stream.cpp:43:57
 #4 0x57dd08 in Catch::TablePrinter::TablePrinter(std::ostream&, std::vector<Catch::ColumnInfo, std::allocator<Catch::ColumnInfo>>) /home/githubrunner/actions-runner/_work/Ichor/Ichor/build/src/catch2/reporters/catch_reporter_console.cpp:305:5
 #5 0x57dd08 in Catch::Detail::unique_ptr<Catch::TablePrinter> Catch::Detail::make_unique<Catch::TablePrinter, std::ostream&, std::vector<Catch::ColumnInfo, std::allocator<Catch::ColumnInfo>>>(std::ostream&, std::vector<Catch::ColumnInfo, std::allocator<Catch::ColumnInfo>>&&) /home/githubrunner/actions-runner/_work/Ichor/Ichor/build/src/catch2/../catch2/internal/catch_unique_ptr.hpp:111:34
 #6 0x57dd08 in Catch::ConsoleReporter::ConsoleReporter(Catch::ReporterConfig&&) /home/githubrunner/actions-runner/_work/Ichor/Ichor/build/src/catch2/reporters/catch_reporter_console.cpp:381:20
 #7 0x63e291 in Catch::Detail::unique_ptr<Catch::ConsoleReporter> Catch::Detail::make_unique<Catch::ConsoleReporter, Catch::ReporterConfig>(Catch::ReporterConfig&&) /home/githubrunner/actions-runner/_work/Ichor/Ichor/build/src/catch2/../catch2/internal/catch_unique_ptr.hpp:111:34
 #8 0x63e291 in Catch::ReporterFactory<Catch::ConsoleReporter>::create(Catch::ReporterConfig&&) const /home/githubrunner/actions-runner/_work/Ichor/Ichor/build/src/catch2/../catch2/reporters/catch_reporter_registrars.hpp:48:20
 #9 0x5defab in Catch::ReporterRegistry::create(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char>> const&, Catch::ReporterConfig&&) const /home/githubrunner/actions-runner/_work/Ichor/Ichor/build/src/catch2/internal/catch_reporter_registry.cpp:62:28
 #10 0x5defab in Catch::(anonymous namespace)::createReporter(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char>> const&, Catch::ReporterConfig&&) /home/githubrunner/actions-runner/_work/Ichor/Ichor/build/src/catch2/catch_session.cpp:46:75
 #11 0x5dc174 in Catch::(anonymous namespace)::prepareReporters(Catch::Config const*) /home/githubrunner/actions-runner/_work/Ichor/Ichor/build/src/catch2/catch_session.cpp:56:24
 #12 0x5dc174 in Catch::Session::runInternal() /home/githubrunner/actions-runner/_work/Ichor/Ichor/build/src/catch2/catch_session.cpp:320:29
 #13 0x5db471 in Catch::Session::run() /home/githubrunner/actions-runner/_work/Ichor/Ichor/build/src/catch2/catch_session.cpp:269:24
 #14 0x56ad1b in int Catch::Session::run<char>(int, char const* const*) /home/githubrunner/actions-runner/_work/Ichor/Ichor/build/src/catch2/../catch2/catch_session.hpp:41:30
 #15 0x56ad1b in main /home/githubrunner/actions-runner/_work/Ichor/Ichor/build/src/catch2/internal/catch_main.cpp:36:29
 #16 0x7f0733b8ed8f in __libc_start_call_main csu/../sysdeps/nptl/libc_start_call_main.h:58:16

SUMMARY: AddressSanitizer: 376 byte(s) leaked in 1 allocation(s).
```

All of these errors disappear if I remove either lto or address sanitizer.

Source file compilation:
```
/usr/bin/clang++-19 -D_GLIBCXX_ASSERTIONS -D_GLIBCXX_SANITIZE_VECTOR -D_LIBCPP_HARDENING_MODE=_LIBCPP_HARDENING_MODE_FAST -D__SANITIZE_ADDRESS__ -I/home/oipo/Programming/Ichor/external/Catch2/src/catch2/.. -I/home/oipo/Programming/Ichor/build/external/Catch2/generated-includes -O3 -ggdb3 -DNDEBUG -flto=full -ffile-prefix-map=/home/oipo/Programming/Ichor/external/Catch2/= -fsanitize=address,undefined -fno-omit-frame-pointer -fno-sanitize=vptr -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=3 -std=c++2b -MD -MT external/Catch2/src/CMakeFiles/Catch2.dir/catch2/matchers/catch_matchers_templated.cpp.o -MF external/Catch2/src/CMakeFiles/Catch2.dir/catch2/matchers/catch_matchers_templated.cpp.o.d -o external/Catch2/src/CMakeFiles/Catch2.dir/catch2/matchers/catch_matchers_templated.cpp.o -c /home/oipo/Programming/Ichor/external/Catch2/src/catch2/matchers/catch_matchers_templated.cpp
```

Linking:
```
/usr/bin/clang++-19 -O3 -ggdb3 -DNDEBUG -flto=full   -Wl,--exclude-libs,ALL -fsanitize=address,undefined -no-pie -Wl,-z,nodlopen -Wl,-z,noexecstack -Wl,-z,relro -Wl,-z,now -Wl,--as-needed -Wl,--no-copy-dt-needed-entries test/CMakeFiles/AsyncFileIOTests.dir/AsyncFileIOTests.cpp.o -o /home/githubrunner/actions-runner/_work/Ichor/Ichor/bin/AsyncFileIOTests /home/githubrunner/actions-runner/_work/Ichor/Ichor/bin/libichor.a /home/githubrunner/actions-runner/_work/Ichor/Ichor/bin/libCatch2Main.a -lsystemd  -ldl  -lrt /home/githubrunner/actions-runner/_work/Ichor/Ichor/bin/libCatch2.a
```


I don't really know how to make a minimally reproducible case here, as I can't trigger this without the combination of Catch2 and my source code. If I leave out Catch2, it doesn't trigger either. Please let me know what I could do to improve this report.
</pre>
<img width="1" height="1" alt="" src="http://email.email.llvm.org/o/eJzUWV9v2zgS_zTMy0CCRPnvQx5UO94z0DSFnd7u3otAiSObF4rUkVQS76c_UJJdO4m76W2a7gFGYg9FcubH3_zRkFkrNgrxkgw_kOH8gjVuq83ljaj1Ra757rKQTG3gHo0VWpEkhXhKopRE6a9bVFDoqhZSqA08CLcF6TRJ5mUjJTDFgXFu0FqwTAkn_kBD6AyWsEEHDygMBzRGG0sSvx4ZRf0nSgkdQBgSusiFInQx00Y3Tii8RessidIwDKE2emNYBfiIRePQArOgtKmYhDAMSZSWBpHQCaFTr7ZQ90wKDlb8gSRK01wbhxwInRTaIPCmqpH7Z59o8lqtMsvxHpV7rXZVoypWZ8W2UXfPtay1UA7N2yia2p0qFkLi8ua7ACTJ_P_-s7ciicaDKJ52P65Wq5uVh_sjsrv1gZxJChwdFh7uCittdiCR3dmO73NhsHCtBHQJyXgE-c55hllCpyAUxKDzf2Ph9iImpS6YX600uupYDgBAaBJB9JiUFDn3E3WNhjltQOEDoZNGtT7JQWq18QsVxlnXlGVYfF0hhuhxNBgnRbv1jLli63dI0jk6JmT3vVHiPw1mtTMkmVnHO2mWFY-Pcdz9yJkVRaatM0JtrDPIKpLMii1rnfUwxwsyZ5hwdj-cXJ080VurzdF4-zmnXMXuMOs0_Inadb4HhC62ukJCFxvhtk1uGqV8vFqwwgmtbHAQZA_a3BG6WBZbbY7-542QnNCFNQWhi8LbTAldtH54-NV6tWJyL8u-nlC4rWuSpHFreuLd2B8zPXfM6xaSdQuJ7W3k_Edb80x_g41lucSsO6KsO6OwaG2hI2_KpDclOWfKql_j2KRvjPytTBwkJEmH497EAUSPwzHn0eSJibd-gc-mC-rPJXRyIKruWU5HJ_y9x6Ij79GiMy2bSi1Vqc9S_eWne-L_QBAN1j5tGXuEYifJCq2sltjjl0RDD2CP3_AcfmeD2lmMXxl2zs0_BvT9jqQNRz-DCqP28_cLg4OeGKNzxJh1bFr17HpZSCcn0aaTzrQqxeYdTH-9L0y8zXQf-sc-XiZIp_H_4AzPcPl-f3iG4gzOw9gy92ei_BcJNjkH9t4Qr6A2uz9Dua9HDLK2NHwFIp4D7r1w-QYXDW6EdYYZ2yM0mByzceo9kGPJ8jMArbr5uycIfKuu6xLqWxZ0HZp9xPz54L9QS5yivetdf0Q91vtKKY7OgU3ohCmtdpVuLChWoa1Zgd3L4wH1o7j390b_h-HegW3RWqHVvlLzxeh4X2nEcQtxEY8H3wdxbbBm5oCxPXXyzsI9Dum7Gzn0RtJ9UIvpOSPX3azuh2nU8kDUH1tcv6RzQiOv9HSvdNIqnQ_GT0PxU6V_hrJ0ND1BuK34R4zHracK5b6p8JEzTYRy3k284MCX9yHOaUo4tbIP_SfvoPHwxMiKCfWOIdNvt2fK6IQovigcl9E4SfIJ8knplcsyKXIf25hxWcGkbOdDYZu94XZnOdY-Aara-W1emhD6Exz6BBiPuvbP-sv1dbr6nSQppF1b86Rx9LQdJJHdIe-6Qn2w9EzoRsOn_booTaUEXYLbosW-LQpcWFbXyAyIEpZgsNL3CCjcFg1Ip0Gb5y3WsFdXN6ZAKIXEvknbKfBCq3XRWHPoFbbtXkI_EPohiKcQzLNfPi4_zH77LUvX66vV7fLm0_pYuk4_LW-X_7rK_nk1u71Z-SE_8vlz9o90Nb_6tPz0S3Z9M78iyZmBbJGub_20r0ul8_nqar3OMgiWX3mmRa0JXXzuupaVT11fyYSPB9bM9kx6xvrXL7fn5kvLblChYQ55IFQhG44WgpsEgs2G5wkE80_zqw9ffoGgPGqGB6U_iKA2WIrHoGI1SeZ_wTKSzCEo90dOknnPAkJnjeJYCoUcglLpQFfCBaVhFQZ9S7mTH829r52B4Eu2uFndLhe_Z-ubL6vZlT-RUwlJ5gkEbQUwLzqG0ByC6zkE17dw_gBm1-wOF0KiPYyFXJjjo6n8l-OidC_IHFa19GD7CBBqCK4X77RVyCHQ72ZWAW9H9Fdu-zwGfRTqrq0IvzNG_Bn7AYJfJaGzIMDH1mMCKXJP1vTjx1fwWOmgFrhf4w9CZ0pzqWtUpzJ8xMI6Vtwdiw1Ko0-feziow2ygELnfpJcoHRS63gXc9SMBKmcEWnDoE_PpsT-9WOkJ8EzcH7J-i6z54o3Omy0sRS68IGRvuWTH1GufVxkE0u6sw4oDBJJL_9e8ySvY6W4he05wEqVL4D4Njx0YZFLu4M4TYqsfwGmo2B0Cg0ooUbWDBmujeVOI3KdRZhG2aNCXbczCEgrWLeWM2GzQgNsK216E6sb5VO4zby5Um3l9du80a69Gqx3YLkUXmmMIS5_hJbJ7BD9579szEA64Rnu6UVcDhPBZoldKooMKO1Metsx51XQjOXDtzRJVbXzl0KrXvYGGF_wy4dNkyi7wMh4no2g6jEbJxfayjNigSPLhMM5HOJyMWRJFo-kgylnMyrgcXYhLGtFhFEfDeJSMB0k4KKKoGAwHZTnibDqmZBBhxYQMpbyvQm02F8LaBi9jGo-jwYVkOUrb3jdTqvAB2lFCKRnOL8ylnxTkzcaSQSSF957DMk44iZdHgYXQD88LIDBoG-msr726K-AFR4luX1ZdNEZebp2r21sTujhQLix05Rkk7_f_gtro7kJv0Srpfb634v6S_jcAAP__Hlr2ng">