| Issue |
148838
|
| Summary |
LLDB crashes evaluating a no_unique_address structure with tail padding
|
| Labels |
lldb
|
| Assignees |
|
| Reporter |
labath
|
(Note you need to have assertions enabled for this to crash. With assertions disabled this seems to work, but presumably the assertion is there for a reason.)
```
$ cat a.cc
struct NoAddr {
private:
int large_member;
char small_member;
};
struct Padder {
[[no_unique_address]] NoAddr no_addr;
char member_in_padding;
};
Padder *padder;
$ clang++ a.cc -c -g -o a.o -fstandalone-debug
$ lldb a.o -o "expr -- *padder"
(lldb) target create "a.o"
Current executable set to '/tmp/a.o' (x86_64).
(lldb) expr -- *padder
lldb: clang/lib/CodeGen/CGRecordLayoutBuilder.cpp:960: void {anonymous}::CGRecordLow
ering::checkBitfieldClipping(bool) const: Assertion `M.Offset >= Tail && "Bitfield access unit is not clipped"' failed.
LLDB diagnostics will be written to /tmp/diagnostics-ef7e28
Please include the directory content when filing a bug report
PLEASE submit a bug report to https://github.com/llvm/llvm-project/issues/ and include the crash backtrac
e.
Stack dump:
0. Program arguments: lldb a.o -o "expr -- *padder"
#0 0x00005625ccf52ad0 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (lldb+0x65ad0)
#1 0x00005625ccf500da SignalHandler(int, siginfo_t*, void*) Signals.cpp:0:0
#2 0x00007f2324e4ac50 (/lib64/libc.so.6+0x3cc50)
#3 0x00007f2324f2024d syscall (/lib64/libc.so.6+0x11224d)
#4 0x00007f2329fcf3e2 SignalHandler(int, siginfo_t*, void*) Signals.cpp:0:0
#5 0x00007f2324e4ac50 (/lib64/libc.so.6+0x3cc50)
#6 0x00007f2324ea11bc (/lib64/libc.so.6+0x931bc)
#7 0x00007f2324e4aba6 raise (/lib64/libc.so.6+0x3cba6)
#8 0x00007f2324e328fa abort (/lib64/libc.so.6+0x248fa)
#9 0x00007f2324e3281e (/lib64/libc.so.6+0x2481e)
#10 0x00007f2324e42f16 (/lib64/libc.so.6+0x34f16)
#11 0x00007f232bc869bc (anonymous namespace)::CGRecordLowering::lower(bool) CGRecordLayoutBuilder.cpp:0:0
#12 0x00007f232bc86ef5 clang::CodeGen::CodeGenTypes::ComputeRecordLayout(clang::RecordDecl const*, llvm::
StructType*) CGRecordLayoutBuilder.cpp:0:0
#13 0x00007f232bc78e7f clang::CodeGen::CodeGenTypes::ConvertRecordDeclType(clang::RecordDecl const*) Code
GenTypes.cpp:0:0
#14 0x00007f232bc7c575 clang::CodeGen::CodeGenTypes::ConvertTypeForMem(clang::QualType) CodeGenTypes.cpp:
0:0
#15 0x00007f232bc9f89a EmitPointerWithAlignment(clang::Expr const*, clang::CodeGen::LValueBaseInfo*, clan
g::CodeGen::TBAAAccessInfo*, clang::CodeGen::KnownNonNull_t, clang::CodeGen::CodeGenFunction&) CGExpr.cpp
:0:0
...
```
A possible fix in #122197.
![]()
_______________________________________________
llvm-bugs mailing list
llvm-bugs@lists.llvm.org
https://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-bugs
