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Date: Tue, 6 Jun 2017 05:30:10 -0700
From: Tony Lindgren <tony@atomide.com>
To: Johannes Weiner <hannes@cmpxchg.org>
Cc: Russell King - ARM Linux <linux@armlinux.org.uk>,
        Andrew Morton <akpm@linux-foundation.org>,
        Josef Bacik <josef@toxicpanda.com>, Michal Hocko <mhocko@suse.com>,
        Vladimir Davydov <vdavydov.dev@gmail.com>,
        Rik van Riel <riel@redhat.com>, Mark Brown <broonie@kernel.org>,
        linux-kernel@vger.kernel.org
Subject: Re: Regression on ARMs in next-20170531
Message-ID: <20170606123009.GB3730@atomide.com>
References: <20170531164544.GF3730@atomide.com>
 <20170531174333.GA27796@n2100.armlinux.org.uk>
 <20170604113257.GA1095@cmpxchg.org>
 <20170606055516.GR3730@atomide.com>
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* Tony Lindgren <tony@atomide.com> [170605 22:55]:
> * Johannes Weiner <hannes@cmpxchg.org> [170604 04:36]:
> > I think it's NULL because the slab allocation happens before even the
> > root_mem_cgroup is set up, and so root_mem_cgroup -> lruvec -> pgdat
> > gives us garbage.
> > 
> > Tony, Josef, since the patches are dropped from -next, could you test
> > the -mm tree at git://git.cmpxchg.org/linux-mmots.git and verify that
> > this patch below fixes the issue?
> 
> Looks like next-20170605 is broken for ARMs again.. And the patch
> below does not apply for me against mmots/master or next.
> Care to update?

Oh I got it to apply on next-20170605, I must have had something
else applied causing issues on earlyer attempt. Now I'm getting the
following error.

Regards,

Tony

8< -----------------
Unable to handle kernel paging request at virtual address 2ea2d007
pgd = c0004000
[2ea2d007] *pgd=00000000
Internal error: Oops: 5 [#1] SMP ARM
Modules linked in:
CPU: 0 PID: 0 Comm: swapper Not tainted 4.12.0-rc3-next-20170605+ #1227
Hardware name: Generic OMAP4 (Flattened Device Tree)
task: c0d0ae00 task.stack: c0d00000
PC is at __mod_node_page_state+0x2c/0xc8
LR is at __per_cpu_offset+0x0/0x8
pc : [<c0280078>]    lr : [<c0d07d6c>]    psr: 200001d3
sp : c0d01eec  ip : 00000000  fp : 00000001
r10: c0c7cf68  r9 : 00008000  r8 : 00000000
r7 : 00000001  r6 : 00000006  r5 : 2ea2d000  r4 : 00000007
r3 : 00000007  r2 : 00000001  r1 : 00000006  r0 : c0dc1fc0
Flags: nzCv  IRQs off  FIQs off  Mode SVC_32  ISA ARM  Segment none
Control: 10c5387d  Table: 8000404a  DAC: 00000051
Process swapper (pid: 0, stack limit = 0xc0d00218)
Stack: (0xc0d01eec to 0xc0d02000)
1ee0:                            400001d3 c0dc1fc0 c028018c 00000001 c1599440
1f00: c0d58834 efd83000 00000000 c02af214 01000000 c157a890 00002000 00008000
1f20: 00000001 00000001 00008000 c02aeb4c 00000000 00008000 c0d58834 00008000
1f40: 01008000 c0c23a88 c0d58834 c1580034 400001d3 c02afa9c 00000000 c086b230
1f60: c0d58834 000000c0 01000000 c157a78c c0abe0fc 00000080 00002000 c0dd4000
1f80: efffec40 c0c55a48 00000000 c0c23a88 c157a78c c0c5be48 c0c5bde8 c157a890
1fa0: c0dd4000 c0c25a9c 00000000 ffffffff c0dd4000 c0d07940 c0dd4000 c0c00abc
1fc0: ffffffff ffffffff 00000000 c0c006a0 00000000 c0c55a48 c0dd4214 c0d07958
1fe0: c0c55a44 c0d0cae4 8000406a 411fc093 00000000 8000807c 00000000 00000000
[<c0280078>] (__mod_node_page_state) from [<c028018c>] (mod_node_page_state+0x2c/0x4c)
[<c028018c>] (mod_node_page_state) from [<c02af214>] (cache_alloc_refill+0x654/0x898)
[<c02af214>] (cache_alloc_refill) from [<c02afa9c>] (kmem_cache_alloc+0x2d4/0x364)
[<c02afa9c>] (kmem_cache_alloc) from [<c0c23a88>] (create_kmalloc_cache+0x20/0x8c)
[<c0c23a88>] (create_kmalloc_cache) from [<c0c25a9c>] (kmem_cache_init+0xac/0x11c)
[<c0c25a9c>] (kmem_cache_init) from [<c0c00abc>] (start_kernel+0x1b8/0x3d8)
[<c0c00abc>] (start_kernel) from [<8000807c>] (0x8000807c)
Code: e79e5103 e28c3001 e0833001 e1a04003 (e19440d5)