Messages in this thread Patch in this message | | | Date | Tue, 25 Jul 2006 09:51:00 +0000 | From | "gmu 2k6" <> | Subject | Re: Re: i686 hang on boot in userspace |
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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 > } > > /*
I patched Linus' HEAD/trunk/master tree with the following and it stuck in cciss init. I hope I didn't get your diff wrong: diff --git a/drivers/block/cciss.c b/drivers/block/cciss.c index 1c4df22..641dc2d 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); - blk_complete_request(cmd->rq); + #if 1 + cciss_softirq_done(cmd->rq); + #else + blk_complete_request(cmd->rq); + #endif }
/*
now I'm really going to try to get the remote serial console working. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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