Thibault-Monnier wrote:
> it seems like the tsan instrumented binaries just segfault after one of these
> changes. cmake config used by the buildbot is:
>
> ```
> cmake -DCMAKE_C_COMPILER_LAUNCHER=ccache -DCMAKE_CXX_COMPILER_LAUNCHER=ccache
> -DLLVM_USE_SANITIZER=Thread -DCMAKE_BUILD_TYPE=Release
> -DLLVM_ENABLE_ASSERTIONS=ON -DLLVM_OPTIMIZED_TABLEGEN=ON
> '-DLLVM_ENABLE_PROJECTS=llvm;clang-tools-extra;clang' '-DLLVM_LIT_ARGS=-v
> -vv' -GNinja ../llvm-project/llvm
> ```
>
> relevant test target is `check-clangd`.
I'm able to reproduce, and executing the clang binary seg faults immediately.
Here's the stack trace:
```cpp
#0 0x000055555655c103 in __tsan_func_entry ()
#1 0x000055555f208c5b in fastParseASCIIIdentifier(char const*, char const*)
[clone .resolver] ()
#2 0x00007ffff7fceb82 in elf_machine_lazy_rel (map=0x7ffff7ffe2f0,
scope=<optimized out>, l_addr=<optimized out>, reloc=0x5555563e9280,
skip_ifunc=<optimized out>)
at ../sysdeps/x86_64/dl-machine.h:545
#3 elf_dynamic_do_Rela (map=0x7ffff7ffe2f0, scope=<optimized out>,
reladdr=<optimized out>, relsize=<optimized out>, nrelative=<optimized out>,
lazy=<optimized out>,
skip_ifunc=<optimized out>) at ./elf/do-rel.h:99
#4 _dl_relocate_object_no_relro (l=l@entry=0x7ffff7ffe2f0, scope=<optimized
out>, reloc_mode=<optimized out>, consider_profiling=<optimized out>) at
./elf/dl-reloc.c:296
#5 0x00007ffff7fd23c1 in _dl_relocate_object (l=l@entry=0x7ffff7ffe2f0,
scope=<optimized out>, reloc_mode=<optimized out>,
consider_profiling=consider_profiling@entry=0)
at ./elf/dl-reloc.c:346
#6 0x00007ffff7fe4363 in dl_main (phdr=<optimized out>, phnum=<optimized out>,
user_entry=<optimized out>, auxv=<optimized out>) at ./elf/rtld.c:2289
#7 0x00007ffff7fe0bc6 in _dl_sysdep_start
(start_argptr=start_argptr@entry=0x7fffffffdc50,
dl_main=dl_main@entry=0x7ffff7fe2560 <dl_main>) at
../sysdeps/unix/sysv/linux/dl-sysdep.c:140
#8 0x00007ffff7fe22a1 in _dl_start_final (arg=0x7fffffffdc50) at
./elf/rtld.c:497
#9 _dl_start (arg=0x7fffffffdc50) at ./elf/rtld.c:582
#10 0x00007ffff7fe1148 in _start () from /lib64/ld-linux-x86-64.so.2
```
Here's the disassembly:
```cpp
Dump of assembler code for function __tsan_func_entry:
0x000055555655c0f0 <+0>: endbr64
0x000055555655c0f4 <+4>: mov %rdi,%rsi
0x000055555655c0f7 <+7>: mov $0xfffffffffffff840,%rax
0x000055555655c0fe <+14>: mov %fs:0x28(%rax),%rdi
=> 0x000055555655c103 <+19>: mov 0x18(%rdi),%rax
0x000055555655c107 <+23>: lea 0x8(%rax),%rcx
0x000055555655c10b <+27>: test $0xff0,%ecx
0x000055555655c111 <+33>: je 0x5555565531f0
<_ZN6__tsan21TraceRestartFuncEntryEPNS_11ThreadStateEm>
```
>From here, I don't really know how to proceed. I would love some help if
>anybody has a clue.
https://github.com/llvm/llvm-project/pull/175452
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