From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <gcc-bugzilla@gcc.gnu.org>
Received: by sourceware.org (Postfix, from userid 48)
 id 5C1933858D35; Fri, 10 Dec 2021 13:13:08 +0000 (GMT)
DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 5C1933858D35
From: "mathieu.malaterre at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/103629] Possible miscompilation triggered by pthread +
 exception
Date: Fri, 10 Dec 2021 13:13:08 +0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: changed
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: gcc
X-Bugzilla-Component: c++
X-Bugzilla-Version: 11.2.0
X-Bugzilla-Keywords: wrong-code
X-Bugzilla-Severity: normal
X-Bugzilla-Who: mathieu.malaterre at gmail dot com
X-Bugzilla-Status: RESOLVED
X-Bugzilla-Resolution: INVALID
X-Bugzilla-Priority: P3
X-Bugzilla-Assigned-To: unassigned at gcc dot gnu.org
X-Bugzilla-Target-Milestone: ---
X-Bugzilla-Flags: 
X-Bugzilla-Changed-Fields: 
Message-ID: <bug-103629-4-ErWASGLkan@http.gcc.gnu.org/bugzilla/>
In-Reply-To: <bug-103629-4@http.gcc.gnu.org/bugzilla/>
References: <bug-103629-4@http.gcc.gnu.org/bugzilla/>
Content-Type: text/plain; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable
X-Bugzilla-URL: http://gcc.gnu.org/bugzilla/
Auto-Submitted: auto-generated
MIME-Version: 1.0
X-BeenThere: gcc-bugs@gcc.gnu.org
X-Mailman-Version: 2.1.29
Precedence: list
List-Id: Gcc-bugs mailing list <gcc-bugs.gcc.gnu.org>
List-Unsubscribe: <https://gcc.gnu.org/mailman/options/gcc-bugs>,
 <mailto:gcc-bugs-request@gcc.gnu.org?subject=unsubscribe>
List-Archive: <https://gcc.gnu.org/pipermail/gcc-bugs/>
List-Post: <mailto:gcc-bugs@gcc.gnu.org>
List-Help: <mailto:gcc-bugs-request@gcc.gnu.org?subject=help>
List-Subscribe: <https://gcc.gnu.org/mailman/listinfo/gcc-bugs>,
 <mailto:gcc-bugs-request@gcc.gnu.org?subject=subscribe>
X-List-Received-Date: Fri, 10 Dec 2021 13:13:08 -0000

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D103629

--- Comment #9 from Mathieu Malaterre <mathieu.malaterre at gmail dot com> =
---
Compiling the reduce test case without pthread lead to some kind of excepti=
on:

```
(gdb) bt full
#0  __GI_raise (sig=3Dsig@entry=3D6) at ../sysdeps/unix/sysv/linux/raise.c:=
49
        set =3D {__val =3D {0 <repeats 12 times>, 8245935278387129975,
5908832823118463008, 0, 0}}
        pid =3D <optimized out>
        tid =3D <optimized out>
        ret =3D <optimized out>
#1  0x00007ffff7bf9536 in __GI_abort () at abort.c:79
        save_stage =3D 1
        act =3D {__sigaction_handler =3D {sa_handler =3D 0x7ffff7d925e0
<_IO_2_1_stderr_>, sa_sigaction =3D 0x7ffff7d925e0 <_IO_2_1_stderr_>}, sa_m=
ask =3D
{__val =3D {140737350282933, 140737351591392, 140737351591392,
              140737351591523, 140737351595200, 3432, 140737350279750, 11, =
1,
140737351591392, 93824992325712, 140737352586656, 140737488347968, 0,
140737350287193, 140737351591840}}, sa_flags =3D -135945484,
          sa_restorer =3D 0x7ffff7d927a0 <stderr>}
        sigs =3D {__val =3D {32, 0, 0, 0, 17, 9223372036854775922, 14073735=
2422480,
140737350282933, 0, 140737350282933, 140737353353159, 140737351591392,
93824992325672, 140737351595200, 3432, 140737350279750}}
#2  0x00007ffff7e4f87a in __gnu_cxx::__verbose_terminate_handler () at
../../../../src/libstdc++-v3/libsupc++/vterminate.cc:95
        terminating =3D true
        t =3D <optimized out>
#3  0x00007ffff7e5b04a in __cxxabiv1::__terminate (handler=3D<optimized out=
>) at
../../../../src/libstdc++-v3/libsupc++/eh_terminate.cc:48
No locals.
#4  0x00007ffff7e5b0b5 in std::terminate () at
../../../../src/libstdc++-v3/libsupc++/eh_terminate.cc:58
No locals.
#5  0x00007ffff7e5b349 in __cxxabiv1::__cxa_throw (obj=3D<optimized out>,
tinfo=3D0x7ffff7fb1530 <typeinfo for std::system_error>, dest=3D0x7ffff7e85=
5a0
<std::system_error::~system_error()>)
    at ../../../../src/libstdc++-v3/libsupc++/eh_throw.cc:95
        globals =3D <optimized out>
        header =3D 0x55555556aeb0
#6  0x00007ffff7e525fa in std::__throw_system_error(int) () from
/usr/lib/x86_64-linux-gnu/libstdc++.so.6
No symbol table info available.
#7  0x00007ffff7fc740f in
std::call_once<Tree::treeType()::{lambda()#1}>(std::once_flag&,
Tree::treeType()::{lambda()#1}&&) (__once=3D..., __f=3D...) at
/usr/include/c++/11/mutex:784
        __e =3D -1
        __callable =3D {____f =3D @0x7fffffffe3ff}
        __exec =3D {<No data fields>}
```

I am not able to reproduce gcc behavior using clang++ (again Debian sid
version).=