Date: Thu, 12 Jun 2014 11:32:07 -0600 From: Ian Lepore <ian@FreeBSD.org> To: Hans Petter Selasky <hps@selasky.org> Cc: "arm@freebsd.org" <arm@FreeBSD.org>, Alan Cox <alc@rice.edu> Subject: Re: RPI-B VM panic Message-ID: <1402594327.20883.216.camel@revolution.hippie.lan> In-Reply-To: <5399E349.5050600@selasky.org> References: <539170AA.2000109@selasky.org> <5396947A.1060601@selasky.org> <5396A0D1.80309@selasky.org> <5396AF63.6040209@selasky.org> <8BA66A45-E08A-475D-A1FA-5047E862681E@rice.edu> <5398B6EA.9030408@selasky.org> <A9433B36-C15C-455E-AB80-3999596936F9@rice.edu> <5398BFD9.60502@selasky.org> <7390A211-C949-4079-B3DA-BF23798B8992@rice.edu> <539942C0.5010706@selasky.org> <5399DF7F.4010501@rice.edu> <5399E349.5050600@selasky.org>
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On Thu, 2014-06-12 at 19:28 +0200, Hans Petter Selasky wrote: > On 06/12/14 19:12, Alan Cox wrote: > > On 06/12/2014 01:03, Hans Petter Selasky wrote: > >> On 06/11/14 22:47, Alan Cox wrote: > >>> > >>> On Jun 11, 2014, at 3:45 PM, Hans Petter Selasky wrote: > >>> > >>>> On 06/11/14 22:20, Alan Cox wrote: > >>>>> > >>>>> On Jun 11, 2014, at 3:07 PM, Hans Petter Selasky wrote: > >>>>> > >>>>>> kernel: file format elf32-littlearm > >>>>>> > >>>>> > >>>>> Then this problem is unrelated to the one that I just fixed. It's > >>>>> also not a problem that I've seen before. > >>>> > >>>> It is happening after your recent patches to -current, optimising > >>>> the "page ordering". Happens every now and then during boot when > >>>> stack is growing looks like. > >>> > >>> More precisely, which commit is that? > >>> > >> > >>> commit 7d20e37fb658b0e2cd7f3c13dac8022e0e866a21 > >>> Author: alc <alc@FreeBSD.org> > >>> Date: Sun May 12 16:50:18 2013 +0000 > >>> > >>> Refactor vm_page_alloc()'s interactions with > >>> vm_reserv_alloc_page() and > >>> vm_page_insert() so that (1) vm_radix_lookup_le() is never called > >>> while the > >>> free page queues lock is held and (2) vm_radix_lookup_le() is > >>> called at most > >>> once. This change reduces the average time that the free page > >>> queues lock > >>> is held by vm_page_alloc() as well as vm_page_alloc()'s average > >>> overall > >>> running time. > >>> > >>> Sponsored by: EMC / Isilon Storage Division > >>> > >> > >> > > > > That's not exactly a recent commit. It was 13 months ago. And, this > > code is exercised by all page allocations except for page table pages > > and uma_small_alloc(). > > > > What this assertion is telling us is that somewhere else we have screwed > > up the vm object to which we are now trying to allocate a page. > > > > Try the attached patch. It will provide additional information the next > > time that the assertion fails. > > > > Here you go: > > > panic: vm_page_insert_after: msucc 0xc0993e50 (0) doesn't succeed pindex 4 > > object 0xc1a2b140 type 0 > > KDB: enter: panic > > [ thread pid 18 tid 100052 ] > > Stopped at $d: ldrb r15, [r15, r15, ror r15]! > > db> Could this be related to changing superpages to enabled by default recently? Easy to test by setting vm.pmap.sp_enabled=0 in ubldr -- Ian
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