Date: Fri, 27 Sep 2019 22:19:16 +0300 From: Oleksandr Rybalko <ray@ddteam.net> To: Warner Losh <imp@bsdimp.com> Cc: mike tancsa <mike@sentex.net>, freebsd-embedded <freebsd-embedded@freebsd.org> Subject: Re: watchdogd stat location Message-ID: <CAJ1Oi8FsG=nEBXdd0CS3U2zZSgh=SMcBO0ieY-KT5b1iDVFmJg@mail.gmail.com> In-Reply-To: <CANCZdfp6bym5b6eFXFH0MxjYsAX%2B1Bi9fGXgp7sFM206zmsveQ@mail.gmail.com> References: <5eba25eb-9ba4-0c93-27c8-e834491298ad@sentex.net> <CANCZdfp6bym5b6eFXFH0MxjYsAX%2B1Bi9fGXgp7sFM206zmsveQ@mail.gmail.com>
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=D0=BF=D1=82, 27 =D0=B2=D0=B5=D1=80. 2019 =D0=BE 19:22 Warner Losh <imp@bsd=
imp.com> =D0=BF=D0=B8=D1=88=D0=B5:
> On Fri, Sep 27, 2019 at 9:36 AM mike tancsa <mike@sentex.net> wrote:
>
> > We sometimes run into an issue where our embedded devices that boot off
> > a read only SD card, hang with a controller error. Its not clear if
> > this is a BIOS/firmware/SDCard or driver bug issue. Its pretty
> > infrequent, but annoying enough that I started to dig to see why the bo=
x
> > is not rebooting via the hardware watchdog. It seems to fail to reboo=
t
> > the box as the stat that it does on the filesystem is off the md backed
> > /etc which is not impacted. I know I could run an external program, bu=
t
> > would it be safer to change the default directory where the stat is don=
e
> > to something that is generally not mounted via ramdisk ?
> >
> > eg.
> >
> >
> > diff -u watchdogd.c.orig watchdogd.c
> > --- watchdogd.c.orig 2019-09-27 10:51:04.273113000 -0400
> > +++ watchdogd.c 2019-09-27 10:51:23.592200000 -0400
> > @@ -365,7 +365,7 @@
> > if (test_cmd !=3D NULL)
> > failed =3D system(test_cmd);
> > else
> > - failed =3D stat("/etc", &sb);
> > + failed =3D stat("/boot", &sb);
> >
> > error =3D watchdog_getuptime(&ts_end);
> > if (error) {
> >
>
> I think this is good.
>
> Warner
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g
> "
>
Why not just stat "/".
I think embedded devices may have monolithic kernel w/o any loadable
modules and book config.
--=20
WBW
-------
Rybalko Aleksandr <ray@ddteam.net>
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