Date: Tue, 31 Jul 2007 10:10:02 -0700 From: "Maksim Yevmenkin" <maksim.yevmenkin@gmail.com> To: "Dmitry Morozovsky" <marck@rinet.ru> Cc: current@freebsd.org Subject: Re: possible showstopper: kbdmux hangs -current Message-ID: <bb4a86c70707311010h303fd8f5v69510157e08c5873@mail.gmail.com> In-Reply-To: <20070731123820.T29245@woozle.rinet.ru> References: <20070727141421.H42349@woozle.rinet.ru> <bb4a86c70707271018p45f3ccbap142bd6506c4dfc46@mail.gmail.com> <20070728173355.O42349@woozle.rinet.ru> <bb4a86c70707301518o5a6e3226j98e992cd4553e677@mail.gmail.com> <20070731123820.T29245@woozle.rinet.ru>
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On 7/31/07, Dmitry Morozovsky <marck@rinet.ru> wrote:
> On Mon, 30 Jul 2007, Maksim Yevmenkin wrote:
>
> MY> > MY> > on some of my mobos -current hangs early (when starning init) if kbdmux is
> MY> > MY> > included in kernel (both on i386 and amd64); this seems to be some race, as
> MY> > MY> > hangs are not 100% reproducible. What info should I provide to debug?
> MY> > MY>
> MY> > MY> the usual suspects are
> MY> > MY>
> MY> > MY> 1) while (KBDMUX_CHECK_CHAR(kbd)) { ... } loop in kbdmux_kbd_event().
> MY> > MY> could you please try to put some debug printf's into it and make sure
> MY> > MY> it does not stuck there.
> MY> >
> MY> > errrm. Added two printfs with ppsratecheck - and, as usual, 'specialist
> MY> > presense effect' is in place: no single hang since, both on stock GENERIC and
> MY> > my own stripped down kernel so far (approx 20 reboots).
> MY> >
> MY> > Will try further.
> MY>
> MY> if you remove your debug code and recompile kbdmux(4), does your
> MY> problem re-appear?
>
> Grrm. It does not (yet).
ok. i have to ask.
1) are you using any non-standard compiler options?
2) how are you building new kernel? (or rather do you use NO_CLEAN or
something like that?)
kbdmux(4) has not been changed for awhile. while i completely accept
possibility of bug in kbdmux(4), i find it somewhat strange that it
does not manifest itself all the time.
thanks,
max
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