Date: Wed, 12 Jun 2013 15:54:17 -0700 From: Alfred Perlstein <bright@mu.org> To: Peter Wemm <peter@wemm.org> Cc: Alexander Leidinger <Alexander@leidinger.net>, Dimitry Andric <dim@freebsd.org>, current@freebsd.org Subject: Re: zfs kernel panic, known incompatibilities with clang & CPUTYPE/COPTFLAGS? Message-ID: <51B8FC19.2050309@mu.org> In-Reply-To: <CAGE5yCrPMNEmJ5dj2TcL5nsMMZApFsifLrXsctikYLZH23r1pw@mail.gmail.com> References: <20130612223024.00003980@unknown> <E9E313A1-AEA5-4926-86A2-6CEF0E7EB388@freebsd.org> <CAGE5yCrPMNEmJ5dj2TcL5nsMMZApFsifLrXsctikYLZH23r1pw@mail.gmail.com>
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On 6/12/13 3:10 PM, Peter Wemm wrote: > On Wed, Jun 12, 2013 at 1:39 PM, Dimitry Andric <dim@freebsd.org> wrote: >> On Jun 12, 2013, at 22:30, Alexander Leidinger <Alexander@Leidinger.net> wrote: >>> I try to update from a pre-clang world (r242511M) to "now" (r251618M). >>> The resulting kernel boots, but while starting some jails (with ezjail >>> from ports, so fairly late in the boot process) I get a kernel panic >>> (IIRC zfs trying to access page 0). >> If you are running on i386, it might be a stack overflow? Try >> increasing the stack a little, it might help in that case. >> > For i386 I'd be more inclined to suspect KVA exhaustion. > > For non-PAE, as a shot in the dark, increase > options KVA_PAGES=384 > .. the default is 256 for PAE. that increases kernel KVA from 1GB to 1.5GB. > > For a PAE system, this number is multipled by 2, so a corresponding > change is 512 -> 768. > > This is just a shot in the dark. If this is amd64, then never mind, > KVA_PAGES is meaningless there. Is there some way we can get a pps ratelimited (or even one-time) message when the kva is almost exhausted? Could that help people? -- Alfred Perlstein VP Software Engineering, iXsystems
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