Comment 4 for bug 1667527

Kernel panic when running this kernel on Ubuntu 1604 on HyperV with Mellanox CX3 SR-IOV enabled.
Could you please build a test kernel based on this one (test kernel 4.4.0-65):

https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1667007
http://kernel.ubuntu.com/~jsalisbury/lp1667007/xenial/

[ 7.976040] Modules linked in: mlx4_core(+) pci_hyperv i2c_piix4 8250_fintek hyperv_fb hv_ballo on input_leds joydev serio_raw mac_hid ib_iser rdma_cm iw_cm ib_cm ib_sa ib_mad ib_core ib_addr is csi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi parport_pc ppdev lp parport autofs4 btrfs raid1 0 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor raid6_pq libcrc32c raid1 raid0 multipath linear hid_generic hyperv_keyboard crct10dif_pclmul crc32_pclmul hid_hyperv hv_net vsc hv_storvsc hid scsi_transport_fc ghash_clmulni_intel hv_utils aesni_intel aes_x86_64 lrw gf128 mul glue_helper ablk_helper cryptd psmouse tulip pata_acpi hv_vmbus floppy fjes
[ 7.976040] CPU: 0 PID: 668 Comm: systemd-udevd Tainted: G B D 4.4.0-64-generic #85~ lp1667527
[ 7.976041] Hardware name: Microsoft Corporation Virtual Machine/Virtual Machine, BIOS 090006 04/28/2016
[ 7.976042] 0000000000000286 0000000096836efa ffff8800f277f1e8 ffffffff813f8083
[ 7.976043] ffffea0003a87500 ffffffff81cd75a2 ffff8800f277f210 ffffffff811937ee
[ 7.976043] ffffea0003a87540 ffff880107ffbf80 ffff8800f277f320 ffff8800f277f2d8
[ 7.976044] Call Trace:
[ 7.976044] [<ffffffff813f8083>] dump_stack+0x63/0x90
[ 7.976045] [<ffffffff811937ee>] bad_page.part.68+0xae/0x100
[ 7.976046] [<ffffffff81197c86>] get_page_from_freelist+0x516/0xa50
[ 7.976048] [<ffffffff81198f19>] __alloc_pages_nodemask+0x159/0x2a0
[ 7.976049] [<ffffffff811e2a7c>] alloc_pages_current+0x8c/0x110
[ 7.976050] [<ffffffff8119354e>] __get_free_pages+0xe/0x40
[ 7.976051] [<ffffffff811beba4>] __tlb_remove_page+0x54/0xa0
[ 7.976053] [<ffffffff811bfa9e>] unmap_page_range+0x50e/0x7a0
[ 7.976054] [<ffffffff811bfdad>] unmap_single_vma+0x7d/0xe0
[ 7.976055] [<ffffffff811c0871>] unmap_vmas+0x51/0xa0
[ 7.976056] [<ffffffff811c9df7>] exit_mmap+0xa7/0x170
[ 7.976057] [<ffffffff8107e0a7>] mmput+0x57/0x130
[ 7.976058] [<ffffffff81083f2a>] do_exit+0x27a/0xb00
[ 7.976059] [<ffffffff81031c41>] oops_end+0xa1/0xd0
[ 7.976060] [<ffffffff810320fb>] die+0x4b/0x70
[ 7.976061] [<ffffffff8102f121>] do_trap+0xb1/0x140
[ 7.976062] [<ffffffff8102f4a9>] do_error_trap+0x89/0x110
[ 7.976063] [<ffffffff811edef7>] ? kfree+0x147/0x150
[ 7.976064] [<ffffffff81558c5e>] ? dev_printk_emit+0x4e/0x70
[ 7.976068] [<ffffffffc0443c0d>] ? mlx4_free_eq+0x11d/0x190 [mlx4_core]
[ 7.976069] [<ffffffff8102fa10>] do_invalid_op+0x20/0x30
[ 7.976070] [<ffffffff8183e10e>] invalid_op+0x1e/0x30
[ 7.976074] [<ffffffffc0443c0d>] ? mlx4_free_eq+0x11d/0x190 [mlx4_core]
[ 7.976075] [<ffffffff811edef7>] ? kfree+0x147/0x150
[ 7.976079] [<ffffffffc0443c0d>] mlx4_free_eq+0x11d/0x190 [mlx4_core]
[ 7.976083] [<ffffffffc04443f2>] mlx4_init_eq_table+0x2b2/0x630 [mlx4_core]
[ 7.976087] [<ffffffffc044efe8>] mlx4_setup_hca+0x1f8/0x7a0 [mlx4_core]
[ 7.976091] [<ffffffffc04502d0>] mlx4_load_one+0xb60/0x1680 [mlx4_core]
[ 7.976095] [<ffffffffc0451312>] mlx4_init_one+0x522/0x6c0 [mlx4_core]
[ 7.976097] [<ffffffff8144a075>] local_pci_probe+0x45/0xa0
[ 7.976098] [<ffffffff8144b4b3>] pci_device_probe+0x103/0x150
[ 7.976099] [<ffffffff8155d4c2>] driver_probe_device+0x222/0x4a0
[ 7.976100] [<ffffffff8155d7c4>] __driver_attach+0x84/0x90
[ 7.976102] [<ffffffff8155d740>] ? driver_probe_device+0x4a0/0x4a0
[ 7.976103] [<ffffffff8155b0ec>] bus_for_each_dev+0x6c/0xc0
[ 7.976104] [<ffffffff8155cc7e>] driver_attach+0x1e/0x20
[ 7.976105] [<ffffffff8155c7bb>] bus_add_driver+0x1eb/0x280
[ 7.976105] [<ffffffffc03be000>] ? 0xffffffffc03be000
[ 7.976106] [<ffffffff8155e0d0>] driver_register+0x60/0xe0
[ 7.976107] [<ffffffff8144999c>] __pci_register_driver+0x4c/0x50
[ 7.976113] [<ffffffffc03be115>] mlx4_init+0x115/0x1000 [mlx4_core]
[ 7.976113] [<ffffffff81002123>] do_one_initcall+0xb3/0x200
[ 7.976115] [<ffffffff811ed0f3>] ? kmem_cache_alloc_trace+0x183/0x1f0
[ 7.976116] [<ffffffff8118dae3>] do_init_module+0x5f/0x1cf
[ 7.976117] [<ffffffff8110a94f>] load_module+0x166f/0x1c10
[ 7.976118] [<ffffffff81106ef0>] ? __symbol_put+0x60/0x60
[ 7.976119] [<ffffffff81214cf0>] ? kernel_read+0x50/0x80
[ 7.976120] [<ffffffff8110b134>] SYSC_finit_module+0xb4/0xe0
[ 7.976121] [<ffffffff8110b17e>] SyS_finit_module+0xe/0x10
[ 7.976122] [<ffffffff8183c5f2>] entry_SYSCALL_64_fastpath+0x16/0x71
[ 7.976123] BUG: Bad page state in process systemd-udevd pfn:ea1d3
[ 7.976123] page:ffffea0003a874c0 count:-1 mapcount:0 mapping: (null) index:0x0
[ 7.976124] flags: 0xffffc000000000()
[ 7.976124] page dumped because: nonzero _count