Date: Thu, 12 Jun 2014 19:28:41 +0200 From: Hans Petter Selasky <hps@selasky.org> To: Alan Cox <alc@rice.edu>, "arm@freebsd.org" <arm@freebsd.org> Subject: Re: RPI-B VM panic Message-ID: <5399E349.5050600@selasky.org> In-Reply-To: <5399DF7F.4010501@rice.edu> 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>
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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> --HPS
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