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    SubjectRe: Re: i686 hang on boot in userspace
    On 7/25/06, Jens Axboe <axboe@suse.de> wrote:
    > On Tue, Jul 25 2006, gmu 2k6 wrote:
    > > On 7/25/06, Jens Axboe <axboe@suse.de> wrote:
    > > >On Tue, Jul 25 2006, gmu 2k6 wrote:
    > > >> On 7/25/06, Jens Axboe <axboe@suse.de> wrote:
    > > >> >On Tue, Jul 25 2006, gmu 2k6 wrote:
    > > >> >> On 7/25/06, Jens Axboe <axboe@suse.de> wrote:
    > > >> >> >On Mon, Jul 24 2006, gmu 2k6 wrote:
    > > >> >> >> the problem I have with hangs is related to changes in CFQ and that
    > > >> >> >> CFQ is now the default. 2.6.17-git12 had the problem but booting
    > > >> >> >> it with elevator=deadline fixes the hang.
    > > >> >> >>
    > > >> >> >> symptoms encountered during git-bisecting between v2.6.17 and
    > > >> >> >v2.6.18-rc1:
    > > >> >> >> A hang while starting network services
    > > >> >> >> B hang while trying to login
    > > >> >> >> 1 on remote console [not SSH] it hang after typing <uid><CR>
    > > >> >> >> 1 via OpenSSH it hang after typing <pwd><CR> when doing slogin
    > > >> >> >root@<IP>
    > > >> >> >>
    > > >> >> >> A is the problem I got in the first place and this seems to be the
    > > >> >> >> case since 2.6.17-git11 definitely although git-bisect pointed me
    > > >at
    > > >> >> >> the following
    > > >> >> >> changeset which is included since 2.6.17-git12:
    > > >> >> >>
    > > >> >> >> caaa5f9f0a75d1dc5e812e69afdbb8720e077fd3
    > > >> >> >> by Jens Axboe
    > > >> >> >> titled "[PATCH] cfq-iosched: many performance fixes"
    > > >> >> >>
    > > >> >> >> strange enough it also hangs with 2.6.17-git11 which did not
    > > >include
    > > >> >that
    > > >> >> >> one changeset yet.
    > > >> >> >
    > > >> >> >So perhaps your bisect isn't 100% trust worthy? Can you do a manual
    > > >> >> >-gitX bisect to see which 2.6.17-gitX introduced the problem?
    > > >> >> >
    > > >> >> >Also please put a serial console or similar on the machine, so you
    > > >can
    > > >> >> >log + store the sysrq+t output.
    > > >> >>
    > > >> >> well I didn't say that caa....fd3 is the exact change which broke it,
    > > >> >> just that it's related to 1) CFQ changes and 2) CFQ being the default
    > > >> >> now.
    > > >> >> I have a Remote Serial Console via HP's integrated Lights-Out Java
    > > >> >> Applet but am not sure how to enable serial console via kernel boot
    > > >> >> params (will try to find out).
    > > >> >> I will first try to find the 2.6.17-git* revision working before
    > > >> >> bisecting it against -git11 or git12.
    > > >> >
    > > >> >Thanks, would be much appreciated to try and narrow it down to a
    > > >> >specific fix.
    > > >> >
    > > >> >Are you seeing the hang on cciss?
    > > >>
    > > >> I'm not sure it is in the cciss driver, but the SmartArray is driven by
    > > >> cciss.
    > > >> starting git<11 boot tests in a minute now.
    > > >
    > > >Ok, thanks for confirming it's cciss. The bug is likely an interaction
    > > >between cciss and cfq I think, so it would be very useful if you can pin
    > > >point which of the cfq patches make it stall.
    > >
    > > is there anything special about cciss or did you just deduce that it
    > > must be cciss in that particular box and are suspecting interaction
    > > problems with that driver and your CFQ changes?
    >
    > Nothing really special about cciss, but a few months ago I had a similar
    > discussion about cciss and a strange hang.
    >
    > If possible, please also try a known bad kernel and apply the below
    > patch and see if it still reproduces:
    >
    > diff --git a/drivers/block/cciss.c b/drivers/block/cciss.c
    > index 1c4df22..2b36e7a 100644
    > --- a/drivers/block/cciss.c
    > +++ b/drivers/block/cciss.c
    > @@ -2362,7 +2362,11 @@ static inline void complete_command(ctlr
    > cmd->rq->completion_data = cmd;
    > cmd->rq->errors = status;
    > blk_add_trace_rq(cmd->rq->q, cmd->rq, BLK_TA_COMPLETE);
    > +#if 1
    > + cciss_softirq_done(cmd->rq);
    > +#else
    > blk_complete_request(cmd->rq);
    > +#endif
    > }
    >
    > /*

    manually nailed it down to 2.6.17-git7 being the first broken revision.
    going to try whether Linus' git tree knows the -git revisions and do a bisect
    otherwise interdiff and looking for CFQ or cciss changes as best I can.
    -
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