I'm getting network dropping and unable to re establish via-rhine.
I was working in bug #1460304 and had upgraded my CPU.
Is there more in common with these bugs?
I tested both kernels
4.1.0-040100rc6-generic
3.19.0-20-generic

A8V-VM
Athlon 64 2 dual core

 1640.820063] ------------[ cut here ]------------
[ 1640.820095] WARNING: CPU: 0 PID: 1297 at /build/buildd/linux-lts-vivid-3.19.0/net/sched/sch_generic.c:303 dev_watchdog+0x24f/0x260()
[ 1640.820099] NETDEV WATCHDOG: eth0 (via-rhine): transmit queue 0 timed out
[ 1640.820101] Modules linked in: snd_hda_codec_analog snd_hda_codec_generic snd_hda_intel snd_hda_controller snd_hda_codec snd_hwdep snd_pcm snd_seq_midi snd_seq_midi_event snd_rawmidi snd_seq snd_seq_device snd_timer nouveau snd joydev mxm_wmi serio_raw wmi k8temp edac_core edac_mce_amd video i2c_viapro soundcore rfcomm bnep ttm bluetooth drm_kms_helper drm i2c_algo_bit shpchp 8250_fintek asus_atk0110 mac_hid binfmt_misc parport_pc ppdev lp parport hid_logitech ff_memless usbhid hid pata_acpi uas usb_storage psmouse via_rhine mii ahci pata_via libahci
[ 1640.820164] CPU: 0 PID: 1297 Comm: Xorg Not tainted 3.19.0-20-generic #20~14.04.1-Ubuntu
[ 1640.820168] Hardware name: System manufacturer System Product Name/A8V-VM, BIOS 080012  01/05/2007
[ 1640.820171]  ffffffff81b3af30 ffff8800bfa03d58 ffffffff817ae4c0 0000000000000000
[ 1640.820174]  ffff8800bfa03da8 ffff8800bfa03d98 ffffffff81074c9a 0000000000000000
[ 1640.820177]  0000000000000000 ffff8800b7efc000 0000000000000001 ffff880000046480
[ 1640.820181] Call Trace:
[ 1640.820184]  <IRQ>  [<ffffffff817ae4c0>] dump_stack+0x45/0x57
[ 1640.820207]  [<ffffffff81074c9a>] warn_slowpath_common+0x8a/0xc0
[ 1640.820210]  [<ffffffff81074d16>] warn_slowpath_fmt+0x46/0x50
[ 1640.820217]  [<ffffffff816cc6ff>] dev_watchdog+0x24f/0x260
[ 1640.820220]  [<ffffffff816cc4b0>] ? dev_graft_qdisc+0x80/0x80
[ 1640.820224]  [<ffffffff810da829>] call_timer_fn+0x39/0x110
[ 1640.820227]  [<ffffffff816cc4b0>] ? dev_graft_qdisc+0x80/0x80
[ 1640.820231]  [<ffffffff810dbff0>] run_timer_softirq+0x220/0x320
[ 1640.820235]  [<ffffffff81078df4>] __do_softirq+0xe4/0x270
[ 1640.820239]  [<ffffffff810791bd>] irq_exit+0x9d/0xb0
[ 1640.820243]  [<ffffffff817b8eea>] smp_apic_timer_interrupt+0x4a/0x60
[ 1640.820250]  [<ffffffff817b6f7d>] apic_timer_interrupt+0x6d/0x80
[ 1640.820252]  <EOI>  [<ffffffff813b2947>] ? clear_page_c+0x7/0x10
[ 1640.820265]  [<ffffffff8117e2d2>] ? get_page_from_freelist+0x4b2/0xa00
[ 1640.820269]  [<ffffffff8117e981>] __alloc_pages_nodemask+0x161/0xa60
[ 1640.820277]  [<ffffffff810ac25f>] ? put_prev_task_fair+0x2f/0x50
[ 1640.820284]  [<ffffffff811cf6aa>] ? kmem_cache_alloc_node_trace+0xea/0x250
[ 1640.820290]  [<ffffffff811b270f>] ? alloc_vmap_area+0x6f/0x340
[ 1640.820324]  [<ffffffffc02f0691>] ? ttm_check_swapping+0x51/0x80 [ttm]
[ 1640.820332]  [<ffffffff811c4021>] alloc_pages_current+0x91/0x100
[ 1640.820342]  [<ffffffffc02f8c9c>] ttm_pool_populate+0x2dc/0x4d0 [ttm]
[ 1640.820347]  [<ffffffff811b44f1>] ? __vmalloc+0x41/0x50
[ 1640.820555]  [<ffffffffc03e96be>] nouveau_ttm_tt_populate+0xae/0x2d0 [nouveau]
[ 1640.820593]  [<ffffffffc03e815e>] ? nv04_gart_manager_new+0x2e/0xb0 [nouveau]
[ 1640.820605]  [<ffffffffc02f0d2e>] ttm_tt_bind+0x3e/0x70 [ttm]
[ 1640.820612]  [<ffffffffc02f31ff>] ttm_bo_handle_move_mem+0x55f/0x5c0 [ttm]
[ 1640.820618]  [<ffffffffc02f3931>] ? ttm_bo_mem_space+0x181/0x350 [ttm]
[ 1640.820625]  [<ffffffffc02f3fa1>] ttm_bo_validate+0x1e1/0x1f0 [ttm]
[ 1640.820715]  [<ffffffffc01f5522>] ? drm_vma_offset_add+0xb2/0xd0 [drm]
[ 1640.820723]  [<ffffffffc02f41e5>] ttm_bo_init+0x235/0x470 [ttm]
[ 1640.820764]  [<ffffffffc03ea423>] nouveau_bo_new+0x213/0x340 [nouveau]
[ 1640.820800]  [<ffffffffc03e8c40>] ? nv10_bo_put_tile_region+0x90/0x90 [nouveau]
[ 1640.820836]  [<ffffffffc03ecf06>] nouveau_gem_new+0x66/0x110 [nouveau]
[ 1640.820841]  [<ffffffff81200500>] ? poll_select_copy_remaining+0x130/0x130
[ 1640.820877]  [<ffffffffc03ed06b>] nouveau_gem_ioctl_new+0xbb/0x1f0 [nouveau]
[ 1640.820891]  [<ffffffffc01dba4c>] drm_ioctl+0x1ec/0x660 [drm]
[ 1640.820896]  [<ffffffff813aedb0>] ? timerqueue_add+0x60/0xb0
[ 1640.820931]  [<ffffffffc03e34a8>] nouveau_drm_ioctl+0x58/0xd0 [nouveau]
[ 1640.820934]  [<ffffffff811ff888>] do_vfs_ioctl+0x2f8/0x510
[ 1640.820937]  [<ffffffff8168fce2>] ? __sys_recvmsg+0x42/0x80
[ 1640.820940]  [<ffffffff811ffb21>] SyS_ioctl+0x81/0xa0
[ 1640.820944]  [<ffffffff817b5ecd>] system_call_fastpath+0x16/0x1b
[ 1640.820947] ---[ end trace 3a9b03ee9e4b166e ]---