On s390 4.9-rc1 + this patch set
I get the following on swapon
[ 308.206195] ------------[ cut here ]------------
[ 308.206203] WARNING: CPU: 5 PID: 20745 at mm/page_alloc.c:3511 __alloc_pages_nodemask+0x884/0xdf8
[ 308.206205] Modules linked in: xt_CHECKSUM iptable_mangle ipt_MASQUERADE nf_nat_masquerade_ipv4 iptable_nat nf_nat_ipv4 nf_nat nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack nf_conntrack ipt_REJECT nf_reject_ipv4 bridge stp llc ebtable_filter ebtables ip6table_filter ip6_tables iptable_filter btrfs raid6_pq xor dm_service_time ghash_s390 prng aes_s390 des_s390 des_generic qeth_l2 sha512_s390 sha256_s390 sha1_s390 sha_common nfsd eadm_sch auth_rpcgss qeth ccwgroup oid_registry nfs_acl lockd grace vhost_net vhost sunrpc macvtap macvlan kvm sch_fq_codel dm_multipath ip_tables
[ 308.206240] CPU: 5 PID: 20745 Comm: swapon Tainted: G W 4.9.0-rc1+ #23
[ 308.206241] Hardware name: IBM 2964 NC9 704 (LPAR)
[ 308.206243] task: 00000000e3bb8000 task.stack: 00000000d4270000
[ 308.206244] Krnl PSW : 0704c00180000000 000000000025db3c
[ 308.206246] (__alloc_pages_nodemask+0x884/0xdf8)
[ 308.206248] R:0 T:1 IO:1 EX:1 Key:0 M:1 W:0 P:0 AS:3 CC:0 PM:0
[ 308.206250] RI:0 EA:3
[ 308.206251]
Krnl GPRS: 000000000000000a 0000000000b2b0ec 0000000100000312 0000000000000001
[ 308.206267] 000000000025d3ec 0000000000000008 0000000000000075 000000000240c0c0
[ 308.206269] 0000000000000001 0000000000000000 000000000000000a 0000000000000000
[ 308.206270] 000000000000000a 000000000079d8c8 000000000025d3ec 00000000d4273ba0
[ 308.206280] Krnl Code: 000000000025db30: a774fd27 brc 7,25d57e
[ 308.206282]
000000000025db34: 92011000 mvi 0(%r1),1
[ 308.206285]
#000000000025db38: a7f40001 brc 15,25db3a
[ 308.206286]
>000000000025db3c: a7f4fd21 brc 15,25d57e
[ 308.206289]
000000000025db40: 4130f150 la %r3,336(%r15)
[ 308.206291]
000000000025db44: b904002c lgr %r2,%r12
[ 308.206293]
000000000025db48: c0e5ffffe11c brasl %r14,259d80
[ 308.206294]
000000000025db4e: a7f4fda3 brc 15,25d694
[ 308.206297] Call Trace:
[ 308.206299] ([<000000000025d3ec>] __alloc_pages_nodemask+0x134/0xdf8)
[ 308.206303] ([<0000000000280d6a>] kmalloc_order+0x42/0x70)
[ 308.206305] ([<0000000000280dd8>] kmalloc_order_trace+0x40/0xf0)
[ 308.206310] ([<00000000002a7090>] init_swap_address_space+0x68/0x138)
[ 308.206312] ([<00000000002ac858>] SyS_swapon+0xbd0/0xf80)
[ 308.206317] ([<0000000000785476>] system_call+0xd6/0x264)
[ 308.206318] Last Breaking-Event-Address:
[ 308.206319] [<000000000025db38>] __alloc_pages_nodemask+0x880/0xdf8
[ 308.206320] ---[ end trace aaeca736f47ac05b ]---
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