Date: Fri, 27 Jul 2007 10:18:35 -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: <bb4a86c70707271018p45f3ccbap142bd6506c4dfc46@mail.gmail.com> In-Reply-To: <20070727141421.H42349@woozle.rinet.ru> References: <20070727141421.H42349@woozle.rinet.ru>
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On 7/27/07, Dmitry Morozovsky <marck@rinet.ru> wrote:
> Hi there,
>
> on some of my mobos -current hangs early (when starning init) if kbdmux is
> included in kernel (both on i386 and amd64); this seems to be some race, as
> hangs are not 100% reproducible. What info should I provide to debug?
the usual suspects are
1) while (KBDMUX_CHECK_CHAR(kbd)) { ... } loop in kbdmux_kbd_event().
could you please try to put some debug printf's into it and make sure
it does not stuck there.
2) callout. kbdmux callout initialized as non mp-safe to make sure
giant is held.
3) task queue. kbdmux(4) uses taskqueue_swi_giant.
you might want to try uncomment section at line 81 in kbdmux.c. this
should add private lock for kbdmux(4). not sure it will work though -
many things has changed since i tried it.
> I'm using only PS2 keyboards, and have no other format keyboards handy;
> however, I can obtain USB keyb if needed.
are you using ps/2 mouse? if so, try to disconnect it and see if this helps.
as you said, you could try to use usb keyboard instead of ps/2.
thanks,
max
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