https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64265
Bug ID: 64265
Summary: r217669 broke tsan
Product: gcc
Version: 5.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: bernd.edlinger at hotmail dot de
Created attachment 34249
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=34249&action=edit
test case
starting with r217669 tsan instrumentation gets wrong code:
g++ -g -fsanitize=thread test.cpp
./a.out
=> soaks all memory up.
reason is this function calls __tsan_func_entry in a loop:
_ZNSt12_Destroy_auxILb0EE9__destroyIN9__gnu_cxx17__normal_iteratorIPSsSt6vectorISsSaISsEEEEEEvT_S9_:
.LFB982:
.loc 5 100 0
.cfi_startproc
pushq %rbp
.cfi_def_cfa_offset 16
.cfi_offset 6, -16
movq %rsp, %rbp
.cfi_def_cfa_register 6
subq $32, %rsp
movq %rdi, -16(%rbp)
movq %rsi, -32(%rbp)
.L153:
movq 8(%rbp), %rax
movq %rax, %rdi
call __tsan_func_entry
.loc 5 102 0 discriminator 2
leaq -32(%rbp), %rdx
leaq -16(%rbp), %rax
movq %rdx, %rsi
movq %rax, %rdi
call
_ZN9__gnu_cxxneIPSsSt6vectorISsSaISsEEEEbRKNS_17__normal_iteratorIT_T0_EESA_
testb %al, %al
je .L152
.loc 5 103 0 discriminator 1
leaq -16(%rbp), %rax
movq %rax, %rdi
call _ZNK9__gnu_cxx17__normal_iteratorIPSsSt6vectorISsSaISsEEEdeEv
movq %rax, %rdi
call _ZSt11__addressofISsEPT_RS0_
movq %rax, %rdi
call _ZSt8_DestroyISsEvPT_
.loc 5 102 0 discriminator 1
leaq -16(%rbp), %rax
movq %rax, %rdi
call _ZN9__gnu_cxx17__normal_iteratorIPSsSt6vectorISsSaISsEEEppEv
jmp .L153
.L152:
.loc 5 104 0
call __tsan_func_exit
leave
.cfi_def_cfa 7, 8
ret
.cfi_endproc
it is generated from bits/stl_container.h, line 95-105:
template<bool>
struct _Destroy_aux
{
template<typename _ForwardIterator>
static void
__destroy(_ForwardIterator __first, _ForwardIterator __last)
{
for (; __first != __last; ++__first)
std::_Destroy(std::__addressof(*__first));
}
};
