Date: Wed, 30 Nov 2016 09:59:27 +0800 From: Sepherosa Ziehau <sepherosa@gmail.com> To: John Baldwin <jhb@freebsd.org> Cc: "freebsd-current@freebsd.org" <current@freebsd.org> Subject: Re: Please test EARLY_AP_STARTUP Message-ID: <CAMOc5cz_KzkJnh-QDTWhpr%2BF0nOPcp9YF3YLseUJ=qQQvW_-EA@mail.gmail.com> In-Reply-To: <5196546.NF2ntCjvkx@ralph.baldwin.cx> References: <7005233.xZtqgRZ2t6@ralph.baldwin.cx> <CAMOc5czd5LF5pGmgVeEgp4N-SqCh26a4LFo96Jxhi4wHFQehFw@mail.gmail.com> <5196546.NF2ntCjvkx@ralph.baldwin.cx>
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On Tue, Nov 29, 2016 at 2:27 AM, John Baldwin <jhb@freebsd.org> wrote: > On Monday, November 28, 2016 02:35:07 PM Sepherosa Ziehau wrote: >> Hi John, >> >> fdc seems to cause panic on Hyper-V: >> https://people.freebsd.org/~sephe/fdc_panic.png > > You shouldn't get this panic in latest HEAD (post-r309148). The base of my kernel tree is ~20 days old :) > >> I then commented out device fdc, and I fixed one panic on Hyper-V here: >> https://reviews.freebsd.org/D8656 > > Replied to the review. > >> After fdc is disabled and hyperv/storvsc is fixed, it seems to boot >> fine, except a long delay (28~30seconds) here: >> .... >> Timecounters tick every 1.000 msec >> ----- >> 28 ~ 30 seconds delay >> ----- >> vlan: initialized, using hash tables with chaining >> .... >> >> I have the bootverbose dmesg here: >> https://people.freebsd.org/~sephe/dmesg_earlyap.txt >> >> I booted 10 times, only one boot does not suffer this 30 seconds >> delay. It sounds like some races to me. Any hints? > > It is likely a race as we start running things sooner now, yes. Can you > break into DDB during the hang and see what thread0 is waiting on? If > it is in the interrupt hooks you can use 'show conifhk' in DDB to see the > list of pending interrupt hooks. That provides a list of candidate drivers > to inspect (e.g. stack traces of relevant kthreads) for what is actually > waiting (and what it is waiting on) Just tried, but I failed to break into DDB during the 30 seconds delay. DDB was entered after the 30 seconds delay, though I press the break key when the delay started. Thanks, sephe -- Tomorrow Will Never Die
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