https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66624
Bug ID: 66624
Summary: libstdc++ iostream uninitialized data
Product: gcc
Version: 5.1.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: libstdc++
Assignee: unassigned at gcc dot gnu.org
Reporter: doko at gcc dot gnu.org
Target Milestone: ---
[forwarded from https://bugs.debian.org/789369]
richard@deodand:~/junk$ cat t.cc
#include <iostream>
int main() {
std::cout << std::hex;
return 0;
}
richard@deodand:~/junk$ clang++-3.6 -fsanitize=undefined -O0
-fno-optimize-sibling-calls -fno-omit-frame-pointer -g -o t t.cc
richard@deodand:~/junk$ ./t
/usr/bin/../lib/gcc/i586-linux-gnu/5.1.1/../../../../include/c++/5.1.1/bits/ios_base.h:102:24:
runtime error: load of value 4294967221, which is not a valid value for
type 'std::_Ios_Fmtflags'
/usr/bin/../lib/gcc/i586-linux-gnu/5.1.1/../../../../include/c++/5.1.1/bits/ios_base.h:82:67:
runtime error: load of value 4294967221, which is not a valid value for
type 'std::_Ios_Fmtflags'
As far as I can see the problem here is that ios_base::_M_flags is never
initialized.
