https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94810
Bug ID: 94810
Summary: std::cout segmentation fault in
__attribute__((constructor)) function
Product: gcc
Version: 9.3.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: libstdc++
Assignee: unassigned at gcc dot gnu.org
Reporter: gcasper42 at gmail dot com
Target Milestone: ---
Created attachment 48389
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=48389&action=edit
Code to reproduce bug
Exact Version of GCC:
g++ (Arch Linux 9.3.0-1) 9.3.0
System Type:
Arch Linux (under Windows Subsystem for Linux 1)
The attached code compiles and runs, but runs into a seg fault. The seg fault
occurs when trying to print using std::cout in my function marked with the
__attribute__((constructor)), but when I instead use printf to print there is
no seg fault.
See end for successful build environment.
GDB Stacktrace/Useful Output:
Program received signal SIGSEGV, Segmentation fault.
0x00007fffff6e661a in std::ostream::sentry::sentry (this=0x7ffffffee460,
__os=...)
at
/build/gcc/src/gcc-build/x86_64-pc-linux-gnu/libstdc++-v3/include/bits/ostream.tcc:46
46
/build/gcc/src/gcc-build/x86_64-pc-linux-gnu/libstdc++-v3/include/bits/ostream.tcc:
No such file or directory.
(gdb) bt
#0 0x00007fffff6e661a in std::ostream::sentry::sentry (this=0x7ffffffee460,
__os=...)
at
/build/gcc/src/gcc-build/x86_64-pc-linux-gnu/libstdc++-v3/include/bits/ostream.tcc:46
#1 0x00007fffff6e6d4c in std::__ostream_insert<char, std::char_traits<char> >
(__out=..., __s=__s@entry=0x8002005 "Starting", __n=8)
at
/build/gcc/src/gcc-build/x86_64-pc-linux-gnu/libstdc++-v3/include/bits/ostream_insert.h:76
#2 0x00007fffff6e722e in std::operator<< <std::char_traits<char> > (
__out=..., __s=0x8002005 "Starting")
at
/build/gcc/src/gcc-build/x86_64-pc-linux-gnu/libstdc++-v3/include/bits/char_traits.h:335
#3 0x0000000008001180 in constructor () at test.cpp:4
#4 0x00000000080012ad in __libc_csu_init ()
#5 0x00007fffff2b6fb0 in __libc_start_main () from /usr/lib/libc.so.6
#6 0x000000000800109e in _start ()
Something weird to mention (other build environment):
While using the below build environment, the attached code runs as expected.
Exact Version of GCC:
g++.exe (x86_64-posix-seh-rev0, Built by MinGW-W64 project) 8.1.0
System Type:
MinGW-W64 Windows 10
