<table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>Issue</th>
<td>
<a href=https://github.com/llvm/llvm-project/issues/63704>63704</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>
Clang crash in PCH/late-parsed-instantiations.cpp
</td>
</tr>
<tr>
<th>Labels</th>
<td>
clang:frontend,
crash,
platform:aix
</td>
</tr>
<tr>
<th>Assignees</th>
<td>
</td>
</tr>
<tr>
<th>Reporter</th>
<td>
spavloff
</td>
</tr>
</table>
<pre>
After [2e9037](https://reviews.llvm.org/rG2e903709de003dc6ae980197f4a0850a158dd9b8) clang starts crashing on the test `PCH/late-parsed-instantiations.cpp` on [clang-ppc64-aix buildbot](https://lab.llvm.org/buildbot/#/builders/214/builds/8309/steps/6/logs/FAIL__Clang__late-parsed-instantiations_cpp):
```
******************** TEST 'Clang :: PCH/late-parsed-instantiations.cpp' FAILED ********************
Script:
--
: 'RUN: at line 1'; /scratch/powerllvm/powerllvm_env/aix-ppc64/clang-ppc64-aix/build/bin/clang -cc1 -internal-isystem /scratch/powerllvm/powerllvm_env/aix-ppc64/clang-ppc64-aix/build/lib/clang/17/include -nostdsysteminc -fdelayed-template-parsing -std=c++14 -emit-pch /scratch/powerllvm/powerllvm_env/aix-ppc64/clang-ppc64-aix/llvm-project/clang/test/PCH/late-parsed-instantiations.cpp -o /scratch/powerllvm/powerllvm_env/aix-ppc64/clang-ppc64-aix/build/tools/clang/test/PCH/Output/late-parsed-instantiations.cpp.tmp.pch -verify
: 'RUN: at line 2'; /scratch/powerllvm/powerllvm_env/aix-ppc64/clang-ppc64-aix/build/bin/clang -cc1 -internal-isystem /scratch/powerllvm/powerllvm_env/aix-ppc64/clang-ppc64-aix/build/lib/clang/17/include -nostdsysteminc -fdelayed-template-parsing -std=c++14 -include-pch /scratch/powerllvm/powerllvm_env/aix-ppc64/clang-ppc64-aix/build/tools/clang/test/PCH/Output/late-parsed-instantiations.cpp.tmp.pch /scratch/powerllvm/powerllvm_env/aix-ppc64/clang-ppc64-aix/llvm-project/clang/test/PCH/late-parsed-instantiations.cpp -verify
: 'RUN: at line 4'; /scratch/powerllvm/powerllvm_env/aix-ppc64/clang-ppc64-aix/build/bin/clang -cc1 -internal-isystem /scratch/powerllvm/powerllvm_env/aix-ppc64/clang-ppc64-aix/build/lib/clang/17/include -nostdsysteminc -fdelayed-template-parsing -std=c++14 -emit-pch -fpch-instantiate-templates /scratch/powerllvm/powerllvm_env/aix-ppc64/clang-ppc64-aix/llvm-project/clang/test/PCH/late-parsed-instantiations.cpp -o /scratch/powerllvm/powerllvm_env/aix-ppc64/clang-ppc64-aix/build/tools/clang/test/PCH/Output/late-parsed-instantiations.cpp.tmp.pch -verify
: 'RUN: at line 5'; /scratch/powerllvm/powerllvm_env/aix-ppc64/clang-ppc64-aix/build/bin/clang -cc1 -internal-isystem /scratch/powerllvm/powerllvm_env/aix-ppc64/clang-ppc64-aix/build/lib/clang/17/include -nostdsysteminc -fdelayed-template-parsing -std=c++14 -include-pch /scratch/powerllvm/powerllvm_env/aix-ppc64/clang-ppc64-aix/build/tools/clang/test/PCH/Output/late-parsed-instantiations.cpp.tmp.pch /scratch/powerllvm/powerllvm_env/aix-ppc64/clang-ppc64-aix/llvm-project/clang/test/PCH/late-parsed-instantiations.cpp -verify
--
Exit Code: 134
Command Output (stderr):
--
+ : 'RUN: at line 1'
+ /scratch/powerllvm/powerllvm_env/aix-ppc64/clang-ppc64-aix/build/bin/clang -cc1 -internal-isystem /scratch/powerllvm/powerllvm_env/aix-ppc64/clang-ppc64-aix/build/lib/clang/17/include -nostdsysteminc -fdelayed-template-parsing -std=c++14 -emit-pch /scratch/powerllvm/powerllvm_env/aix-ppc64/clang-ppc64-aix/llvm-project/clang/test/PCH/late-parsed-instantiations.cpp -o /scratch/powerllvm/powerllvm_env/aix-ppc64/clang-ppc64-aix/build/tools/clang/test/PCH/Output/late-parsed-instantiations.cpp.tmp.pch -verify
+ : 'RUN: at line 2'
+ /scratch/powerllvm/powerllvm_env/aix-ppc64/clang-ppc64-aix/build/bin/clang -cc1 -internal-isystem /scratch/powerllvm/powerllvm_env/aix-ppc64/clang-ppc64-aix/build/lib/clang/17/include -nostdsysteminc -fdelayed-template-parsing -std=c++14 -include-pch /scratch/powerllvm/powerllvm_env/aix-ppc64/clang-ppc64-aix/build/tools/clang/test/PCH/Output/late-parsed-instantiations.cpp.tmp.pch /scratch/powerllvm/powerllvm_env/aix-ppc64/clang-ppc64-aix/llvm-project/clang/test/PCH/late-parsed-instantiations.cpp -verify
+ : 'RUN: at line 4'
+ /scratch/powerllvm/powerllvm_env/aix-ppc64/clang-ppc64-aix/build/bin/clang -cc1 -internal-isystem /scratch/powerllvm/powerllvm_env/aix-ppc64/clang-ppc64-aix/build/lib/clang/17/include -nostdsysteminc -fdelayed-template-parsing -std=c++14 -emit-pch -fpch-instantiate-templates /scratch/powerllvm/powerllvm_env/aix-ppc64/clang-ppc64-aix/llvm-project/clang/test/PCH/late-parsed-instantiations.cpp -o /scratch/powerllvm/powerllvm_env/aix-ppc64/clang-ppc64-aix/build/tools/clang/test/PCH/Output/late-parsed-instantiations.cpp.tmp.pch -verify
+ : 'RUN: at line 5'
+ /scratch/powerllvm/powerllvm_env/aix-ppc64/clang-ppc64-aix/build/bin/clang -cc1 -internal-isystem /scratch/powerllvm/powerllvm_env/aix-ppc64/clang-ppc64-aix/build/lib/clang/17/include -nostdsysteminc -fdelayed-template-parsing -std=c++14 -include-pch /scratch/powerllvm/powerllvm_env/aix-ppc64/clang-ppc64-aix/build/tools/clang/test/PCH/Output/late-parsed-instantiations.cpp.tmp.pch /scratch/powerllvm/powerllvm_env/aix-ppc64/clang-ppc64-aix/llvm-project/clang/test/PCH/late-parsed-instantiations.cpp -verify
Assertion failed: *FpPragmaCurrentValue == SemaObj->FpPragmaStack.DefaultValue && "Expected a default pragma float_control value", file /scratch/powerllvm/powerllvm_env/aix-ppc64/clang-ppc64-aix/llvm-project/clang/lib/Serialization/ASTReader.cpp, line 8150, void clang::ASTReader::UpdateSema()()
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: /scratch/powerllvm/powerllvm_env/aix-ppc64/clang-ppc64-aix/build/bin/clang -cc1 -internal-isystem /scratch/powerllvm/powerllvm_env/aix-ppc64/clang-ppc64-aix/build/lib/clang/17/include -nostdsysteminc -fdelayed-template-parsing -std=c++14 -include-pch /scratch/powerllvm/powerllvm_env/aix-ppc64/clang-ppc64-aix/build/tools/clang/test/PCH/Output/late-parsed-instantiations.cpp.tmp.pch /scratch/powerllvm/powerllvm_env/aix-ppc64/clang-ppc64-aix/llvm-project/clang/test/PCH/late-parsed-instantiations.cpp -verify
1. <eof> parser at end of file
/scratch/powerllvm/powerllvm_env/aix-ppc64/clang-ppc64-aix/build/tools/clang/test/PCH/Output/late-parsed-instantiations.cpp.script: line 4: 58065322 IOT/Abort trap (core dumped) /scratch/powerllvm/powerllvm_env/aix-ppc64/clang-ppc64-aix/build/bin/clang -cc1 -internal-isystem /scratch/powerllvm/powerllvm_env/aix-ppc64/clang-ppc64-aix/build/lib/clang/17/include -nostdsysteminc -fdelayed-template-parsing -std=c++14 -include-pch /scratch/powerllvm/powerllvm_env/aix-ppc64/clang-ppc64-aix/build/tools/clang/test/PCH/Output/late-parsed-instantiations.cpp.tmp.pch /scratch/powerllvm/powerllvm_env/aix-ppc64/clang-ppc64-aix/llvm-project/clang/test/PCH/late-parsed-instantiations.cpp -verify
--
********************
```
The crash is observed on single platform only.
</pre>
<img width="1px" height="1px" alt="" src="http://email.email.llvm.org/o/eJzsWV1v27gS_TX0y0AGRVq29OAHx7buLVDcBk16XwNKHNlsKVEgKTfZX7-gFLnZ7qYN2hjIAgqEWPySDmcOD0cc4Zw6NIhrklyRZDcTnT8au3atOGlTVbPCyIf1pvJogSRXDDPKVyTZEZYevW8d4RvCcsJyiyeFX91c61M9N_YQqv4zdKeZREq5LJcCs5TG2apaCJomVMRJKmVWpIRlUGrRHMB5Yb2D0gp3VM0BTAP-iODReSBLer39L2G5Fh6jVliHMlKN86LxSnhlGjcv25YsaRhGkqv-kVHblstFJNQ9FJ3SsjD-n_BrUTzFfu4aGvlYgdYRlrN4MVaEYsppRljuPLahuAwPM4dwm2_evb-72wYUd3fPg74LoFkWoNAdoRuypI_XUGS_fsHt_uYWCFv1ICC8gm_gRVZkKwj49zv4HQDDFG5Kq1p_nmAUPc6MbwK2j5_-F-6EB60ahJiwFeFXEGxaWuHLI2F5a76iDf55en-HzYmwXKj7wcmE5d-5fPRT-FXN2A5RWcYQqcajbYSOlHtwHuvXfqNWxdhOWB6vCMtVU-pOIkSNcV4Or1VNCVElUYsHlJHHuj17JqyAyHlJ-K4k7Iqwq3gBEdbKR215fC28oWPUWvMZS_8EcFhzhOUvIQtE5rWN543R7jk0Hzrfdv6nsOa-bufBUNEJraoefsQ6NrHux6x7fMhrEu8ivn5Di-LnrFtMrHuh1kVVWx6fWBnPo91bcvm_XgeTiZGTDl5QB8fYb3-vPGyNxEC-mC-G2q2pa9FIGCYLhKXOS7T2aXh8jh7ZFfwggvzWZ2LyFEdeQj-f5R-b-Dcp6eUjymf5t5j4N8WWb1Qbk4mbkzZeXBs3zqENbVAJpVEOXNzk7bUVh1psO2ux8f8XukMgfEf4Dm6wFh-KzxHh-7HbjRfll_kOK9HpsTNbErYEwtj-vsXSowQBcugBbT8KKm2EvytN463RcArjCGOEbaFSGi9ssoGQN2iV0OqP3j6E5Zub248oJNrhaHc7rMU0TmgonIySw_n7cEB87j0UP7VSeAz2ISwNkfjwvzf09fv95mYPritq5UFA0R3AYmusB2_gr0fsB-WPXTEvTf0I_--zUM51GMgJ4StgXEn-iENGAApRfvFWlBhgtxZba0p0DiU409mhOowUzpkyKLkE2zXg-vPn-eNhdPAqyK5uz58UdE5odm3NwYoahD10NTbeDaSZBGoSqNcXqDgwjvAtmorwPfSjbNgksZFgql4pxm3y7RnXjfmcMd7kG0hSukw4Y_Duw21QnKLXACtaOP8RlpbGYr_2UBKWTctrWl4XPWX6_dTld8nY2_NWpByYwqE9oQTTQPCjRgh-rYytwTT6YT6Tay4znokZruNlmi4ZjTmfHdep5JKVZbrIOF2kVcYkLVhcVUzQOC4kn6k1o4zTFV3ShKYJn6erRNAktC0YrtiKLCjWQulz0nrW753rJV_RxUyLArXrc_qMjTt7ZU3jsZFDMBIawkTOpRE64ZveKYwku5ld964puoMjC6qV899S_DOvvMb1kFp-NErzouTyrLN6_evBQT_HPwMAAP__71Dmfg">