divide error: 0000 [#1] SMP in task_numa_migrate - handle_mm_fault vanilla 4.4.6

[Stefan Priebe <s.priebe@profihost.ag>]

Hi,

while running qemu 2.5 on a host running 4.4.6 the host system has 
crashed (load > 200) 3 times in the last 3 days.

Always with this stack trace: (copy left here: 
http://pastebin.com/raw/bCWTLKyt)

[69068.874268] divide error: 0000 [#1] SMP
[69068.875242] Modules linked in: ebtable_filter ebtables ip6t_REJECT 
nf_reject_ipv6 nf_conntrack_ipv6 nf_defrag_ipv6 ip6table_filter 
ip6_tables ipt_REJECT nf_reject_ipv4 xt_physdev xt_comment 
nf_conntrack_ipv4 nf_defrag_ipv4 xt_tcpudp xt_mark xt_set xt_addrtype 
xt_conntrack nf_conntrack ip_set_hash_net ip_set vhost_net tun vhost 
macvtap macvlan kvm_intel nfnetlink_log kvm nfnetlink irqbypass 
netconsole dlm xt_multiport iptable_filter ip_tables x_tables iscsi_tcp 
libiscsi_tcp libiscsi scsi_transport_iscsi nfsd auth_rpcgss oid_registry 
bonding coretemp 8021q garp fuse i2c_i801 i7core_edac edac_core 
i5500_temp button btrfs xor raid6_pq dm_mod raid1 md_mod usb_storage 
ohci_hcd bcache sg usbhid sd_mod ata_generic uhci_hcd ehci_pci ehci_hcd 
usbcore ata_piix usb_common igb i2c_algo_bit mpt3sas raid_class ixgbe 
scsi_transport_sas i2c_core mdio ptp pps_core
[69068.895604] CPU: 14 PID: 6673 Comm: ceph-osd Not tainted 4.4.6+7-ph #1
[69068.897052] Hardware name: Supermicro X8DT3/X8DT3, BIOS 2.1 
03/17/2012
[69068.898578] task: ffff880fc7f28000 ti: ffff880fda2c4000 task.ti: 
ffff880fda2c4000
[69068.900377] RIP: 0010:[<ffffffff860b372c>]  [<ffffffff860b372c>] 
task_h_load+0xcc/0x100
[69068.961763] RSP: 0000:ffff880fda2c7b50  EFLAGS: 00010257
[69069.023910] RAX: 0000000000000000 RBX: ffff880fda2c7c10 RCX: 
0000000000000000
[69069.085953] RDX: 0000000000000000 RSI: 0000000000000001 RDI: 
ffff880fc7f28000
[69069.151731] RBP: ffff880fda2c7bc8 R08: 00000001041955df R09: 
ffff880fffd153f8
[69069.213757] R10: 0000000000000009 R11: 0000000000000193 R12: 
ffff881f6832c780
[69069.274271] R13: ffff88203fc35380 R14: 0000000000000007 R15: 
00000000000000b6
[69069.334727] FS:  00007f578a3fb700(0000) GS:ffff880fffd00000(0000) 
knlGS:0000000000000000
[69069.396435] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[69069.458522] CR2: 00007f5784f18468 CR3: 0000001fe9738000 CR4: 
00000000000026e0
[69069.520799] Stack:
[69069.581430]  ffffffff860b6855 ffff880fda2c7b78 0000000000000000 
0000000000000005
[69069.642629]  ffff880fffd00000 0000000000000015 fffffffffffffe7d 
0000000000000015
[69069.702815]  0000000000015380 ffff880fda2c7bc8 ffff880fc7f28000 
00000000000001e9
[69069.761881] Call Trace:
[69069.819883]  [<ffffffff860b6855>] ? task_numa_find_cpu+0x225/0x670
[69069.878368]  [<ffffffff860b79f0>] task_numa_migrate+0x550/0x950
[69069.936059]  [<ffffffff863d9138>] ? find_next_bit+0x18/0x20
[69069.993262]  [<ffffffff860b7e6d>] numa_migrate_preferred+0x7d/0x90
[69070.050528]  [<ffffffff860b89a5>] task_numa_fault+0x7c5/0xaa0
[69070.106544]  [<ffffffff861a2c0b>] ? mpol_misplaced+0x16b/0x1b0
[69070.163705]  [<ffffffff8618104e>] __handle_mm_fault+0x9ae/0x11f0
[69070.220013]  [<ffffffff865e4c52>] ? inet_recvmsg+0x72/0x90
[69070.276558]  [<ffffffff8655240b>] ? SYSC_recvfrom+0x12b/0x170
[69070.332283]  [<ffffffff8618196f>] handle_mm_fault+0xdf/0x180
[69070.388515]  [<ffffffff8604f324>] __do_page_fault+0x164/0x380
[69070.443897]  [<ffffffff860b25c3>] ? account_user_time+0x73/0x80
[69070.498534]  [<ffffffff860b2b3e>] ? vtime_account_user+0x4e/0x70
[69070.552598]  [<ffffffff8604f5a7>] do_page_fault+0x37/0x90
[69070.605960]  [<ffffffff86002a23>] ? syscall_return_slowpath+0x83/0xf0
[69070.660705]  [<ffffffff866b32f8>] page_fault+0x28/0x30
[69070.715707] Code: 86 b8 00 00 00 48 89 86 b0 00 00 00 48 85 c9 75 ca 
49 8b 81 b0 00 00 00 49 8b 49 78 31 d2 48 0f af 87 d8 01 00 00 5d 48 83 
c1 01 <48> f7 f1 c3 4c 89 ce 48 8b 8e c0 00 00 00 48 8b 46 78 4c 89 86
[69070.835144] RIP  [<ffffffff860b372c>] task_h_load+0xcc/0x100
[69070.894095]  RSP <ffff880fda2c7b50>
[69070.953213] ---[ end trace 8d6f449a03dacfd4 ]---

Would be nice if we can fix this in 4.4?

Greets,
Stefan