Date: Fri, 28 Jul 2017 18:18:59 +0000 From: Glen Barber <gjb@FreeBSD.org> To: Peter <pmc@citylink.dinoex.sub.org> Cc: freebsd-stable@FreeBSD.ORG, Allan Jude <allanjude@freebsd.org> Subject: Re: 11.1-RELEASE: new line containing garbage added to "top" Message-ID: <20170728181859.GI32551@FreeBSD.org> In-Reply-To: <olfqrk$2eou$1@oper.dinoex.de> References: <olfdv2$17v5$1@oper.dinoex.de> <20170728160436.GE32551@FreeBSD.org> <olfqrk$2eou$1@oper.dinoex.de>
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On Fri, Jul 28, 2017 at 07:04:51PM +0200, Peter wrote:
> Glen Barber wrote:
> > On Fri, Jul 28, 2017 at 03:24:50PM +0200, Peter wrote:
> > > After upgrading to 11.1-RELEASE, a new line appears in the output of =
"top"
> > > which contains rubbish:
> > >=20
> > > > last pid: 10789; load averages: 5.75, 5.19, 3.89 up 0+00:34:=
46 03:23:51
> > > > 1030 processes:9 running, 1004 sleeping, 17 waiting
> > > > CPU 0: 16.0% user, 0.0% nice, 78.7% system, 4.9% interrupt, 0.4%=
idle
> > > > CPU 1: 8.0% user, 0.0% nice, 82.5% system, 9.1% interrupt, 0.4%=
idle
> > > > Mem: 218M Active, 34M Inact, 105M Laundry, 600M Wired, 18M Buf, 34M=
Free
> > > > ARC: 324M Total, 54M MFU, 129M MRU, 2970K Anon, 13M Header, 125M Ot=
her
> > > > 136=BF176M Compress185 194M Uncompressed361.94:1 Ratio
> > > > Swap: 2441M Total, 277M Used, 2164M Free, 11% Inuse
> > >=20
> > > > PID USERNAME PRI NICE SIZE RES STATE C TIME WCPU CO=
MMAND
> > > ..
> > >=20
> > >=20
> > > That looks funny. But I dont like it.
> > >=20
> >=20
> > It appears to be fixed in 11-STABLE (r321419).
> >=20
> > Glen
> >=20
>=20
> I don't think so. At least there is nothing in the commitlog. r318449 is =
the
> last commit in 11-STABLE for the respective file; and thats before the
> 11.1-RELEASE branch.
>=20
See r321419.
> The error is in the screen-formatting in "top", and that error was already
> present back in 1997 (and probably earlier), and it is also present in HE=
AD.
>=20
> What "top" does is basically this:
>=20
> > char *string =3D some_buffer_to_print;
> > printf("%.5s", &string[-4]);
>=20
> A negative index on a string usually yields a nullified area. (Except if
> otherwise *eg*) Thats why we usually don't see the matter - nullbytes are
> invisible on screen.
>=20
> Fix is very simple:
>=20
> Index: contrib/top/display.c
> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
> --- display.c (revision 321434)
> +++ display.c (working copy)
> @@ -1310,7 +1310,7 @@
> cursor_on_line =3D Yes;
> putchar(ch);
> *old =3D ch;
> - lastcol =3D 1;
> + lastcol++;
> }
> old++;
>=20
>=20
> ---------------------------------------------------------
> Then, since I was at it, I decided to beautify the proc display as well, =
as
> I usually see >1000 procs:
>=20
>=20
> --- display.c (revision 321434)
> +++ display.c (working copy)
> @@ -100,7 +100,7 @@
> int y_loadave =3D 0;
> int x_procstate =3D 0;
> int y_procstate =3D 1;
> -int x_brkdn =3D 15;
> +int x_brkdn =3D 16;
> int y_brkdn =3D 1;
> int x_mem =3D 5;
> int y_mem =3D 3;
> @@ -373,9 +373,9 @@
> printf("%d processes:", total);
> ltotal =3D total;
>=20
> - /* put out enough spaces to get to column 15 */
> + /* put out enough spaces to get to column 16 */
> i =3D digits(total);
> - while (i++ < 4)
> + while (i++ < 5)
> {
> putchar(' ');
> }
>=20
>=20
> ----------------------------------------------------------------
> Then, concerning the complaint about the empty line (bug #220996), I
> couldn't really reproduce this. But it seems that specifically this issue
> was already fixed in HEAD by this one here:
> https://reviews.freebsd.org/D11693
>=20
> ----------------------------------------------------------------
> Now, can anybody make the above snippets appear in HEAD and 11-STABLE?
>=20
I've CC'd allanjude, who has touched some of these in the past.
Glen
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