Date: Sat, 4 Oct 2014 16:03:39 +0100 From: "Steven Hartland" <smh@freebsd.org> To: "Glen Barber" <gjb@FreeBSD.org> Cc: freebsd-stable@FreeBSD.org, FreeBSD Release Engineering Team <re@FreeBSD.org> Subject: Re: Heads-up: Possible regression between 10.0-RELEASE and 10.1-BETA1 with '/ on ZFS' setup Message-ID: <9E274FD2D44943ED9F9C6057068C8CE0@multiplay.co.uk> References: <20141004024011.GC1199@hub.FreeBSD.org> <64F0D761D09546C7B47DFAA1551500BE@multiplay.co.uk> <20141004031614.GD1199@hub.FreeBSD.org> <6618E7E0B17D41D09DB9B0160C2D4DF1@multiplay.co.uk>
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----- Original Message -----
From: "Steven Hartland" <smh@freebsd.org>
> ----- Original Message -----
> From: "Glen Barber" <gjb@FreeBSD.org>
>> On Sat, Oct 04, 2014 at 03:51:39AM +0100, Steven Hartland wrote:
>> > > [...]
>> > >A possible solution to this is to set kern.kstack_pages=4 via loader(8),
>> > >however in my tests (solely in VirtualBox), this has been ineffective.
>> > >
>> >
>> > This has been a known issue on i386 since the switch to Clang see UPDATING:
>> > 20121223:
>> > After switching to Clang as the default compiler some users of ZFS
>> > on i386 systems started to experience stack overflow kernel panics.
>> > Please consider using 'options KSTACK_PAGES=4' in such configurations.
>> >
>> > In my experience your millage may vary but essentially without 4 stack pages
>> > all bets are off in terms of stability.
>> >
>>
>> Did you read my email?
>
> Cleary 4am was too late to be reading emails and my brain didn't ingest the
> "has been ineffective" so sorry for that.
>
> That said setting options KSTACK_PAGES=4 has more reaching effects than
> kern.kstack_pages=4 so I wonder if you recompiled the kernel with this
> option if you would have any more luck?
Oh and just looking at the code kern.kstack_pages is read only so wont have
any effect, hence you will definitely need to set the kernel option as per
the UPDATING entry.
Regards
Steve
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