lkml.org 
[lkml]   [2018]   [Jun]   [6]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH 1/2] arm64: avoid alloc memory on offline node
On Thu, May 31, 2018 at 08:14:38PM +0800, Xie XiuQi wrote:
> A numa system may return node which is not online.
> For example, a numa node:
> 1) without memory
> 2) NR_CPUS is very small, and the cpus on the node are not brought up
>
> In this situation, we use NUMA_NO_NODE to avoid oops.
>
> [ 25.732905] Unable to handle kernel NULL pointer dereference at virtual address 00001988
> [ 25.740982] Mem abort info:
> [ 25.743762] ESR = 0x96000005
> [ 25.746803] Exception class = DABT (current EL), IL = 32 bits
> [ 25.752711] SET = 0, FnV = 0
> [ 25.755751] EA = 0, S1PTW = 0
> [ 25.758878] Data abort info:
> [ 25.761745] ISV = 0, ISS = 0x00000005
> [ 25.765568] CM = 0, WnR = 0
> [ 25.768521] [0000000000001988] user address but active_mm is swapper
> [ 25.774861] Internal error: Oops: 96000005 [#1] SMP
> [ 25.779724] Modules linked in:
> [ 25.782768] CPU: 1 PID: 1 Comm: swapper/0 Not tainted 4.17.0-rc6-mpam+ #115
> [ 25.789714] Hardware name: Huawei D06/D06, BIOS Hisilicon D06 EC UEFI Nemo 2.0 RC0 - B305 05/28/2018
> [ 25.798831] pstate: 80c00009 (Nzcv daif +PAN +UAO)
> [ 25.803612] pc : __alloc_pages_nodemask+0xf0/0xe70
> [ 25.808389] lr : __alloc_pages_nodemask+0x184/0xe70
> [ 25.813252] sp : ffff00000996f660
> [ 25.816553] x29: ffff00000996f660 x28: 0000000000000000
> [ 25.821852] x27: 00000000014012c0 x26: 0000000000000000
> [ 25.827150] x25: 0000000000000003 x24: ffff000008099eac
> [ 25.832449] x23: 0000000000400000 x22: 0000000000000000
> [ 25.837747] x21: 0000000000000001 x20: 0000000000000000
> [ 25.843045] x19: 0000000000400000 x18: 0000000000010e00
> [ 25.848343] x17: 000000000437f790 x16: 0000000000000020
> [ 25.853641] x15: 0000000000000000 x14: 6549435020524541
> [ 25.858939] x13: 20454d502067756c x12: 0000000000000000
> [ 25.864237] x11: ffff00000996f6f0 x10: 0000000000000006
> [ 25.869536] x9 : 00000000000012a4 x8 : ffff8023c000ff90
> [ 25.874834] x7 : 0000000000000000 x6 : ffff000008d73c08
> [ 25.880132] x5 : 0000000000000000 x4 : 0000000000000081
> [ 25.885430] x3 : 0000000000000000 x2 : 0000000000000000
> [ 25.890728] x1 : 0000000000000001 x0 : 0000000000001980
> [ 25.896027] Process swapper/0 (pid: 1, stack limit = 0x (ptrval))
> [ 25.902712] Call trace:
> [ 25.905146] __alloc_pages_nodemask+0xf0/0xe70
> [ 25.909577] allocate_slab+0x94/0x590
> [ 25.913225] new_slab+0x68/0xc8
> [ 25.916353] ___slab_alloc+0x444/0x4f8
> [ 25.920088] __slab_alloc+0x50/0x68
> [ 25.923562] kmem_cache_alloc_node_trace+0xe8/0x230
> [ 25.928426] pci_acpi_scan_root+0x94/0x278
> [ 25.932510] acpi_pci_root_add+0x228/0x4b0
> [ 25.936593] acpi_bus_attach+0x10c/0x218
> [ 25.940501] acpi_bus_attach+0xac/0x218
> [ 25.944323] acpi_bus_attach+0xac/0x218
> [ 25.948144] acpi_bus_scan+0x5c/0xc0
> [ 25.951708] acpi_scan_init+0xf8/0x254
> [ 25.955443] acpi_init+0x310/0x37c
> [ 25.958831] do_one_initcall+0x54/0x208
> [ 25.962653] kernel_init_freeable+0x244/0x340
> [ 25.966999] kernel_init+0x18/0x118
> [ 25.970474] ret_from_fork+0x10/0x1c
> [ 25.974036] Code: 7100047f 321902a4 1a950095 b5000602 (b9400803)
> [ 25.980162] ---[ end trace 64f0893eb21ec283 ]---
> [ 25.984765] Kernel panic - not syncing: Fatal exception
>
> Signed-off-by: Xie XiuQi <xiexiuqi@huawei.com>
> Tested-by: Huiqiang Wang <wanghuiqiang@huawei.com>
> Cc: Hanjun Guo <hanjun.guo@linaro.org>
> Cc: Tomasz Nowicki <Tomasz.Nowicki@caviumnetworks.com>
> Cc: Xishi Qiu <qiuxishi@huawei.com>
> ---
> arch/arm64/kernel/pci.c | 3 +++
> 1 file changed, 3 insertions(+)
>
> diff --git a/arch/arm64/kernel/pci.c b/arch/arm64/kernel/pci.c
> index 0e2ea1c..e17cc45 100644
> --- a/arch/arm64/kernel/pci.c
> +++ b/arch/arm64/kernel/pci.c
> @@ -170,6 +170,9 @@ struct pci_bus *pci_acpi_scan_root(struct acpi_pci_root *root)
> struct pci_bus *bus, *child;
> struct acpi_pci_root_ops *root_ops;
>
> + if (node != NUMA_NO_NODE && !node_online(node))
> + node = NUMA_NO_NODE;
> +

This really feels like a bodge, but it does appear to be what other
architectures do, so:

Acked-by: Will Deacon <will.deacon@arm.com>

Will

\
 
 \ /
  Last update: 2018-06-06 17:46    [W:0.058 / U:4.236 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site