Global:
When using via vscode clangd extension to analyze C source code of postgres.
clangd vscode extension always tryes 5 times, then closes

Machine:
Linux sshheebbee-hp255g9 6.14.0-34-generic #34-Ubuntu SMP PREEMPT_DYNAMIC Wed Sep 17 09:21:29 UTC 2025 x86_64 x86_64 x86_64 GNU/Linux

sshheebbee@sshheebbee-hp255g9:~$ lsb_release -a No LSB modules are available. Distributor ID:	Ubuntu Description:	Ubuntu 25.04 Release:	25.04 Codename:	plucky 

crash backtrace (copy from):

I[21:17:50.486] Ubuntu clangd version 20.1.2 (0ubuntu1)
I[21:17:50.486] Features: linux+grpc
I[21:17:50.486] PID: 234369
I[21:17:50.486] Working directory: /home/sshheebbee/opensource/postgres
I[21:17:50.486] argv[0]: /usr/bin/clangd
I[21:17:50.486] Starting LSP over stdin/stdout
I[21:17:50.486] <-- initialize(0)
I[21:17:50.487] --> reply:initialize(0) 0 ms
I[21:17:50.494] <-- initialized
I[21:17:50.500] <-- textDocument/didOpen
I[21:17:50.501] <-- textDocument/didOpen
I[21:17:50.503] <-- textDocument/didOpen
I[21:17:50.515] Loaded compilation database from /home/sshheebbee/opensource/postgres/build/compile_commands.json
I[21:17:50.515] ASTWorker building file /home/sshheebbee/opensource/postgres/src/backend/executor/nodeHashjoin.c version 12 with command
[/home/sshheebbee/opensource/postgres/build]
/usr/lib/llvm-20/bin/cc -Isrc/backend/postgres_lib.a.p -Isrc/include -I../src/include -I/usr/include/libxml2 -fdiagnostics-color=always -D_FILE_OFFSET_BITS=64 -Wall -Winvalid-pch -O2 -g -fno-strict-aliasing -fwrapv -fexcess-precision=standard -D_GNU_SOURCE -Wmissing-prototypes -Wpointer-arith -Werror=vla -Wendif-labels -Wmissing-format-attribute -Wimplicit-fallthrough=3 -Wcast-function-type -Wshadow=compatible-local -Wformat-security -Wdeclaration-after-statement -Wmissing-variable-declarations -Wno-format-truncation -Wno-stringop-truncation -fPIC -pthread -DBUILDING_DLL -MD -MQ src/backend/postgres_lib.a.p/executor_nodeHashjoin.c.o -MF src/backend/postgres_lib.a.p/executor_nodeHashjoin.c.o.d -o src/backend/postgres_lib.a.p/executor_nodeHashjoin.c.o -c -resource-dir=/usr/lib/llvm-20/lib/clang/20 -- /home/sshheebbee/opensource/postgres/src/backend/executor/nodeHashjoin.c
I[21:17:50.515] ASTWorker building file /home/sshheebbee/opensource/postgres/src/backend/executor/nodeHash.c version 3 with command
[/home/sshheebbee/opensource/postgres/build]
/usr/lib/llvm-20/bin/cc -Isrc/backend/postgres_lib.a.p -Isrc/include -I../src/include -I/usr/include/libxml2 -fdiagnostics-color=always -D_FILE_OFFSET_BITS=64 -Wall -Winvalid-pch -O2 -g -fno-strict-aliasing -fwrapv -fexcess-precision=standard -D_GNU_SOURCE -Wmissing-prototypes -Wpointer-arith -Werror=vla -Wendif-labels -Wmissing-format-attribute -Wimplicit-fallthrough=3 -Wcast-function-type -Wshadow=compatible-local -Wformat-security -Wdeclaration-after-statement -Wmissing-variable-declarations -Wno-format-truncation -Wno-stringop-truncation -fPIC -pthread -DBUILDING_DLL -MD -MQ src/backend/postgres_lib.a.p/executor_nodeHash.c.o -MF src/backend/postgres_lib.a.p/executor_nodeHash.c.o.d -o src/backend/postgres_lib.a.p/executor_nodeHash.c.o -c -resource-dir=/usr/lib/llvm-20/lib/clang/20 -- /home/sshheebbee/opensource/postgres/src/backend/executor/nodeHash.c
I[21:17:50.515] ASTWorker building file /home/sshheebbee/opensource/postgres/src/include/executor/executor.h version 1 with command inferred from ../src/backend/executor/execAmi.c
[/home/sshheebbee/opensource/postgres/build]
/usr/lib/llvm-20/bin/cc -Isrc/backend/postgres_lib.a.p -Isrc/include -I../src/include -I/usr/include/libxml2 -fdiagnostics-color=always -D_FILE_OFFSET_BITS=64 -Wall -Winvalid-pch -O2 -g -fno-strict-aliasing -fwrapv -fexcess-precision=standard -D_GNU_SOURCE -Wmissing-prototypes -Wpointer-arith -Werror=vla -Wendif-labels -Wmissing-format-attribute -Wimplicit-fallthrough=3 -Wcast-function-type -Wshadow=compatible-local -Wformat-security -Wdeclaration-after-statement -Wmissing-variable-declarations -Wno-format-truncation -Wno-stringop-truncation -fPIC -pthread -DBUILDING_DLL -MD -MQ src/backend/postgres_lib.a.p/executor_execAmi.c.o -MF src/backend/postgres_lib.a.p/executor_execAmi.c.o.d -c -x c-header -resource-dir=/usr/lib/llvm-20/lib/clang/20 -- /home/sshheebbee/opensource/postgres/src/include/executor/executor.h
I[21:17:50.517] --> textDocument/clangd.fileStatus
I[21:17:50.517] --> textDocument/clangd.fileStatus
I[21:17:50.518] --> textDocument/clangd.fileStatus
I[21:17:50.580] Loaded compilation database from /home/sshheebbee/opensource/postgres/build/compile_commands.json
I[21:17:50.585] <-- textDocument/documentSymbol(1)
I[21:17:50.585] <-- textDocument/codeAction(2)
I[21:17:50.585] <-- textDocument/documentLink(3)
I[21:17:50.585] <-- textDocument/inlayHint(4)
I[21:17:50.586] --> window/workDoneProgress/create(0)
I[21:17:50.586] Enqueueing 1327 commands for indexing
I[21:17:50.609] <-- reply(0)
I[21:17:50.609] --> $/progress
I[21:17:50.609] --> $/progress
I[21:17:50.753] Built preamble of size 1926372 for file /home/sshheebbee/opensource/postgres/src/include/executor/executor.h version 1 in 0.23 seconds
I[21:17:50.754] --> workspace/semanticTokens/refresh(1)
I[21:17:50.754] Indexing c17 standard library in the context of /home/sshheebbee/opensource/postgres/src/include/executor/executor.h
I[21:17:50.756] <-- reply(1)
I[21:17:50.757] <-- textDocument/semanticTokens/full(5)
I[21:17:50.801] --> textDocument/publishDiagnostics
I[21:17:50.802] --> textDocument/inactiveRegions
I[21:17:50.829] --> reply:textDocument/documentSymbol(1) 244 ms
I[21:17:50.834] --> reply:textDocument/codeAction(2) 249 ms
I[21:17:50.834] --> reply:textDocument/documentLink(3) 249 ms
PLEASE submit a bug report to https://github.com/llvm/llvm-project/issues/ and include the crash backtrace.
Stack dump without symbol names (ensure you have llvm-symbolizer in your PATH or set the environment var LLVM_SYMBOLIZER_PATH to point to it):
0 libLLVM.so.20.1 0x00007d60b5e1dd1f llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) + 63
1 libLLVM.so.20.1 0x00007d60b5e1ba29 llvm::sys::RunSignalHandlers() + 89
2 libLLVM.so.20.1 0x00007d60b5e1e430
3 libc.so.6 0x00007d60b3c458d0
4 clangd 0x000059f26b203f50
5 clangd 0x000059f26b1f5d48
6 clangd 0x000059f26b1f5a2c
7 clangd 0x000059f26b1e9d5a
8 clangd 0x000059f26b208985
9 clangd 0x000059f26b1e3e51
10 clangd 0x000059f26b1e1701
11 clangd 0x000059f26b1e1ab8
12 clangd 0x000059f26b1e14de
13 clangd 0x000059f26b1e1203
14 clangd 0x000059f26b105304
15 clangd 0x000059f26b2d6f00
16 clangd 0x000059f26b2cefee
17 clangd 0x000059f26b2ceb8b
18 clangd 0x000059f26b439951
19 libc.so.6 0x00007d60b3ca27f1
20 libc.so.6 0x00007d60b3d33b5c
Signalled during AST worker action: InlayHints
Filename: /home/sshheebbee/opensource/postgres/src/include/executor/executor.h
Directory: /home/sshheebbee/opensource/postgres/build
Command Line: /usr/lib/llvm-20/bin/cc -Isrc/backend/postgres_lib.a.p -Isrc/include -I../src/include -I/usr/include/libxml2 -fdiagnostics-color=always -D_FILE_OFFSET_BITS=64 -Wall -Winvalid-pch -O2 -g -fno-strict-aliasing -fwrapv -fexcess-precision=standard -D_GNU_SOURCE -Wmissing-prototypes -Wpointer-arith -Werror=vla -Wendif-labels -Wmissing-format-attribute -Wimplicit-fallthrough=3 -Wcast-function-type -Wshadow=compatible-local -Wformat-security -Wdeclaration-after-statement -Wmissing-variable-declarations -Wno-format-truncation -Wno-stringop-truncation -fPIC -pthread -DBUILDING_DLL -MD -MQ src/backend/postgres_lib.a.p/executor_execAmi.c.o -MF src/backend/postgres_lib.a.p/executor_execAmi.c.o.d -c -x c-header -resource-dir=/usr/lib/llvm-20/lib/clang/20 -- /home/sshheebbee/opensource/postgres/src/include/executor/executor.h
Version: 1
[Info - 21:17:52] Connection to server got closed. Server will restart.
true
[Error - 21:17:52] Request textDocument/inlayHint failed.
[object Object]
[Error - 21:17:52] Request textDocument/semanticTokens/full failed.
[object Object]
[Error - 21:17:52] Request textDocument/codeAction failed.
[object Object]
[Error - 21:17:52] Request textDocument/inlayHint failed.
[object Object]
[Error - 21:17:52] Server process exited with signal SIGSEGV.