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 3AA17386102E; Wed,  4 Aug 2021 10:20:32 +0000 (GMT)
DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 3AA17386102E
From: "vincent-gcc at vinc17 dot net" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug gcov-profile/101773] New: errors when writing to .gcda file are
 not checked
Date: Wed, 04 Aug 2021 10:20:31 +0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: new
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: gcc
X-Bugzilla-Component: gcov-profile
X-Bugzilla-Version: 12.0
X-Bugzilla-Keywords: 
X-Bugzilla-Severity: normal
X-Bugzilla-Who: vincent-gcc at vinc17 dot net
X-Bugzilla-Status: UNCONFIRMED
X-Bugzilla-Resolution: 
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: bug_id short_desc product version bug_status
 bug_severity priority component assigned_to reporter cc target_milestone
Message-ID: <bug-101773-4@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: Wed, 04 Aug 2021 10:20:32 -0000

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D101773

            Bug ID: 101773
           Summary: errors when writing to .gcda file are not checked
           Product: gcc
           Version: 12.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: gcov-profile
          Assignee: unassigned at gcc dot gnu.org
          Reporter: vincent-gcc at vinc17 dot net
                CC: marxin at gcc dot gnu.org
  Target Milestone: ---

When I run a program compiled with -fprofile-generate, this program creates=
 a
.gcda file, but write/close errors are not checked. With GCC 12.0.0 20210729
built from master and an almost full file system for the .gcda file:

$ gcc-test -O -fprofile-generate=3Ddir tst.c
$ strace ./a.out
[...]
openat(AT_FDCWD, "dir/#home#vlefevre#a-tst.gcda", O_RDWR|O_CREAT, 0666) =3D=
 3
fcntl(3, F_SETLKW, {l_type=3DF_WRLCK, l_whence=3DSEEK_SET, l_start=3D0, l_l=
en=3D0}) =3D 0
fcntl(3, F_GETFL)                       =3D 0x8002 (flags O_RDWR|O_LARGEFIL=
E)
fstat(3, {st_mode=3DS_IFREG|0644, st_size=3D0, ...}) =3D 0
read(3, "", 1024)                       =3D 0
lseek(3, 0, SEEK_SET)                   =3D 0
write(3, "adcg 02B\21\20\217\20\0\0\0\241\10\0\0\0\1\0\0\0\1\0\0\0\0\0\0\1"=
...,
84) =3D -1 ENOSPC (No space left on device)
close(3)                                =3D 0
exit_group(0)                           =3D ?
+++ exited with 0 +++

Note that with gcc (Debian 10.2.1-6) 10.2.1 20210110, I get an error messag=
e:

$ ./a.out
libgcov profiling error:dir/#home#vlefevre#tst.gcda:Error writing

but the exit status is also 0, so that the error cannot be detected in scri=
pts.=