Johannes Weiner [off-list ref] writes:

From 89ed86b5b538d8debd3c29567d7e1d31257fa577 Mon Sep 17 00:00:00 2001
From: Johannes Weiner <redacted>
Date: Mon, 5 Jun 2017 14:12:15 -0400
Subject: [PATCH] mm: vmstat: move slab statistics from zone to node counters
 fix

Unable to handle kernel paging request at virtual address 2e116007
pgd = c0004000
[2e116007] *pgd=00000000
Internal error: Oops: 5 [#1] SMP ARM
Modules linked in:
CPU: 0 PID: 0 Comm: swapper Not tainted 4.12.0-rc3-00153-gb6bc6724488a #200
Hardware name: Generic DRA74X (Flattened Device Tree)
task: c0d0adc0 task.stack: c0d00000
PC is at __mod_node_page_state+0x2c/0xc8
LR is at __per_cpu_offset+0x0/0x8
pc : [<c0271de8>]    lr : [<c0d07da4>]    psr: 600000d3
sp : c0d01eec  ip : 00000000  fp : c15782f4
r10: 00000000  r9 : c1591280  r8 : 00004000
r7 : 00000001  r6 : 00000006  r5 : 2e116000  r4 : 00000007
r3 : 00000007  r2 : 00000001  r1 : 00000006  r0 : c0dc27c0
Flags: nZCv  IRQs off  FIQs off  Mode SVC_32  ISA ARM  Segment none
Control: 10c5387d  Table: 8000406a  DAC: 00000051
Process swapper (pid: 0, stack limit = 0xc0d00218)
Stack: (0xc0d01eec to 0xc0d02000)
1ee0:                            600000d3 c0dc27c0 c0271efc 00000001 c0d58864
1f00: ef470000 00008000 00004000 c029fbb0 01000000 c1572b5c 00002000 00000000
1f20: 00000001 00000001 00008000 c029f584 00000000 c0d58864 00008000 00008000
1f40: 01008000 c0c23790 c15782f4 a00000d3 c0d58864 c02a0364 00000000 c0819388
1f60: c0d58864 000000c0 01000000 c1572a58 c0aa57a4 00000080 00002000 c0dca000
1f80: efffe980 c0c53a48 00000000 c0c23790 c1572a58 c0c59e48 c0c59de8 c1572b5c
1fa0: c0dca000 c0c257a4 00000000 ffffffff c0dca000 c0d07940 c0dca000 c0c00a9c
1fc0: ffffffff ffffffff 00000000 c0c00680 00000000 c0c53a48 c0dca214 c0d07958
1fe0: c0c53a44 c0d0caa4 8000406a 412fc0f2 00000000 8000807c 00000000 00000000
[<c0271de8>] (__mod_node_page_state) from [<c0271efc>] (mod_node_page_state+0x2c/0x4c)
[<c0271efc>] (mod_node_page_state) from [<c029fbb0>] (cache_alloc_refill+0x5b8/0x828)
[<c029fbb0>] (cache_alloc_refill) from [<c02a0364>] (kmem_cache_alloc+0x24c/0x2d0)
[<c02a0364>] (kmem_cache_alloc) from [<c0c23790>] (create_kmalloc_cache+0x20/0x8c)
[<c0c23790>] (create_kmalloc_cache) from [<c0c257a4>] (kmem_cache_init+0xac/0x11c)
[<c0c257a4>] (kmem_cache_init) from [<c0c00a9c>] (start_kernel+0x1b8/0x3c0)
[<c0c00a9c>] (start_kernel) from [<8000807c>] (0x8000807c)
Code: e79e5103 e28c3001 e0833001 e1a04003 (e19440d5)
---[ end trace 0000000000000000 ]---

Just to be clear that's not my call trace.

The zone counters work earlier than the node counters because the
zones have special boot pagesets, whereas the nodes do not.

Add boot nodestats against which we account until the dynamic per-cpu
allocator is available.

This isn't working for me. I applied it on top of next-20170605, I still
get an oops:

  $ qemu-system-ppc64 -M pseries -m 1G  -kernel build/vmlinux -vga none -nographic
  SLOF **********************************************************************
  QEMU Starting
  ...
  Linux version 4.12.0-rc3-gcc-5.4.1-next-20170605-dirty (michael-3CFtikCczRkZu89psBSBvNBPR1lH4CV8@public.gmane.org) (gcc version 5.4.1 20170214 (Custom 2af61cd06c9fd8f5) ) #352 SMP Tue Jun 6 14:09:57 AEST 2017
  ...
  PID hash table entries: 4096 (order: -1, 32768 bytes)
  Memory: 1014592K/1048576K available (9920K kernel code, 1536K rwdata, 2608K rodata, 832K init, 1420K bss, 33984K reserved, 0K cma-reserved)
  Unable to handle kernel paging request for data at address 0x00000338
  Faulting instruction address: 0xc0000000002cf338
  Oops: Kernel access of bad area, sig: 11 [#1]
  SMP NR_CPUS=2048 
  NUMA 
  pSeries
  Modules linked in:
  CPU: 0 PID: 0 Comm: swapper Not tainted 4.12.0-rc3-gcc-5.4.1-next-20170605-dirty #352
  task: c000000000d11080 task.stack: c000000000e24000
  NIP: c0000000002cf338 LR: c0000000002cf0dc CTR: 0000000000000000
  REGS: c000000000e279a0 TRAP: 0380   Not tainted  (4.12.0-rc3-gcc-5.4.1-next-20170605-dirty)
  MSR: 8000000002001033 <SF,VEC,ME,IR,DR,RI,LE>
    CR: 22482242  XER: 00000000
  CFAR: c0000000002cf6a0 SOFTE: 0 
  GPR00: c0000000002cf0dc c000000000e27c20 c000000000e28300 c00000003ffc6300 
  GPR04: c000000000e556f8 0000000000000000 000000003f120000 0000000000000000 
  GPR08: c000000000ed3058 0000000000000330 0000000000000000 ffffffffffffff80 
  GPR12: 0000000028402824 c00000000fd40000 0000000000000060 0000000000f540a8 
  GPR16: 0000000000f540d8 fffffffffffffffd 000000003dc54ee0 0000000000000014 
  GPR20: c000000000b90e60 c000000000b90e90 0000000000002000 0000000000000000 
  GPR24: 0000000000000401 0000000000000000 0000000000000001 c00000003e000000 
  GPR28: 0000000080010400 f0000000000f8000 0000000000000006 c000000000cb4270 
  NIP [c0000000002cf338] new_slab+0x338/0x770
  LR [c0000000002cf0dc] new_slab+0xdc/0x770
  Call Trace:
  [c000000000e27c20] [c0000000002cf0dc] new_slab+0xdc/0x770 (unreliable)
  [c000000000e27cf0] [c0000000002d6bb4] __kmem_cache_create+0x1a4/0x6a0
  [c000000000e27e00] [c000000000c73098] create_boot_cache+0x98/0xdc
  [c000000000e27e80] [c000000000c77608] kmem_cache_init+0x5c/0x160
  [c000000000e27f00] [c000000000c43ec8] start_kernel+0x290/0x51c
  [c000000000e27f90] [c00000000000b070] start_here_common+0x1c/0x4ac
  Instruction dump:
  419e0388 893d0007 3d02000b 3908ad58 79291f24 7c68482a 60000000 3d230001 
  e9299a42 39290066 79291f24 7d2a4a14 <eb890008> e93c0080 7fa34800 409e03b0 
  ---[ end trace 0000000000000000 ]---


cheers