Kernel update to version 4.4.155-94.50.1 / 4.4.156-94.57 / 4.4.156-94.61.1 breaks XEN virtualization

[ 2720.184804] ------------[ cut here ]------------

[ 2720.184871] kernel BUG at ../drivers/block/xen-blkfront.c:277!

[ 2720.184937] invalid opcode: 0000 [#1] SMP 

[ 2720.184998] Modules linked in: ip6t_REJECT nf_log_ipv6 nf_conntrack_ipv6 nf_defrag_ipv6 xt_REDIRECT nf_nat_redirect ipt_REJECT xt_tcpudp nf_log_ipv4 nf_log_common xt_LOG xt_limit xt_comment ip6table_filter iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 xt_conntrack iptable_filter af_packet 8021q garp mrp stp llc ip6_tables nf_nat_pptp nf_nat_proto_gre nf_conntrack_pptp iscsi_ibft nf_conntrack_proto_gre iscsi_boot_sysfs nf_nat_tftp nf_conntrack_tftp nf_nat_ftp nf_nat nf_conntrack_ftp xt_state nf_conntrack ip_tables x_tables intel_rapl sb_edac edac_core crct10dif_pclmul xen_fbfront crc32_pclmul syscopyarea crc32c_intel sysfillrect sysimgblt fb_sys_fops ghash_clmulni_intel joydev drbg xen_netfront ansi_cprng xen_kbdfront aesni_intel aes_x86_64 lrw gf128mul glue_helper ablk_helper cryptd pcspkr ext4 crc16 jbd2 mbcache xen_blkfront dm_mirror dm_region_hash dm_log sg dm_multipath dm_mod scsi_dh_rdac scsi_dh_emc scsi_dh_alua scsi_mod autofs4

[ 2720.186404] Supported: Yes

[ 2720.186438] CPU: 2 PID: 5849 Comm: file Not tainted 4.4.155-94.50-default #1

[ 2720.186506] task: ffff880002e3cc80 ti: ffff8800ffbc0000 task.ti: ffff8800ffbc0000

[ 2720.186576] RIP: e030:[<ffffffffa00be685>]  [<ffffffffa00be685>] get_free_grant+0x55/0x60 [xen_blkfront]

[ 2720.186683] RSP: e02b:ffff8800ffbc36d8  EFLAGS: 00010046

[ 2720.186738] RAX: ffff880002c330f8 RBX: ffff8800033c06d0 RCX: ffff8800ffbc37a8

[ 2720.186805] RDX: ffff880002c330f8 RSI: 0000000000000000 RDI: ffff880002c20000

[ 2720.186872] RBP: ffff8800ffbc37a8 R08: ffff8800ffbc37a8 R09: 0000000000001000

[ 2720.186933] R10: 0000000000000000 R11: 00000000000000bc R12: 0000000000001000

[ 2720.186995] R13: ffff880002c20000 R14: ffff880002c20358 R15: ffff8800ffbc37c8

[ 2720.187076] FS:  00007ff74f1d0700(0000) GS:ffff8801f5d00000(0000) knlGS:0000000000000000

[ 2720.187146] CS:  e033 DS: 0000 ES: 0000 CR0: 0000000080050033

[ 2720.187198] CR2: 00007ff74e51d098 CR3: 0000000002ff6000 CR4: 0000000000042660

[ 2720.187266] Stack:

[ 2720.187291]  ffffffffa00c4127 0000000000000019 000000000013c474 ffff8800031ce220

[ 2720.187385]  ffff8800031f04c0 ffff8801f3465200 0000000000f5c3a0 0000000000001000

[ 2720.188013]  ffff8800ffbc37a8 ffffffffa00c40d0 00000000001eb875 0000000000001000

[ 2720.188013] Call Trace:

[ 2720.188013]  [<ffffffffa00c4127>] blkif_setup_rw_req_grant+0x57/0x4c5 [xen_blkfront]

[ 2720.188013]  [<ffffffff81404fa6>] gnttab_foreach_grant_in_range+0x66/0x100

[ 2720.188013]  [<ffffffffa00c0112>] blkif_queue_rq+0x3c2/0x6e0 [xen_blkfront]

[ 2720.188013]  [<ffffffff81306065>] blk_mq_dispatch_rq_list+0xd5/0x1e0

[ 2720.188013]  [<ffffffff8130629e>] blk_mq_process_rq_list+0x12e/0x150

[ 2720.188013]  [<ffffffff8130647b>] __blk_mq_delay_run_hw_queue+0xcb/0xd0

[ 2720.188013]  [<ffffffff81307ede>] blk_mq_flush_plug_list+0x11e/0x130

[ 2720.188013]  [<ffffffff812fc06c>] blk_flush_plug_list+0xcc/0x210

[ 2720.188013]  [<ffffffff8130720c>] blk_sq_make_request+0x16c/0x480

[ 2720.188013]  [<ffffffff812fa6a4>] generic_make_request+0x104/0x2e0

[ 2720.188013]  [<ffffffff812fa8ee>] submit_bio+0x6e/0x140

[ 2720.188013]  [<ffffffffa0144063>] ext4_mpage_readpages+0x373/0x6a0 [ext4]

[ 2720.188013]  [<ffffffff811a1dd7>] __do_page_cache_readahead+0x177/0x200

[ 2720.188013]  [<ffffffff811a1fc8>] ondemand_readahead+0x168/0x2b0

[ 2720.188013]  [<ffffffff8119750d>] filemap_fault+0x2cd/0x420

[ 2720.188013]  [<ffffffffa0102f11>] ext4_filemap_fault+0x31/0x50 [ext4]

[ 2720.188013]  [<ffffffff811c01f7>] __do_fault+0x67/0xe0

[ 2720.188013]  [<ffffffff811c3a6e>] handle_pte_fault+0xbae/0x1660

[ 2720.188013]  [<ffffffff811c60da>] handle_mm_fault+0x2fa/0x640

[ 2720.188013]  [<ffffffff81067dda>] __do_page_fault+0x23a/0x4b0

[ 2720.188013]  [<ffffffff8106807b>] do_page_fault+0x2b/0x70

[ 2720.188013]  [<ffffffff8161f658>] page_fault+0x28/0x30

[ 2720.188013] DWARF2 unwinder stuck at page_fault+0x28/0x30

[ 2720.188013] 

[ 2720.188013] Leftover inexact backtrace:

[ 2720.188013] 

[ 2720.188013] Code: 48 b9 00 01 00 00 00 00 ad de 48 be 00 02 00 00 00 00 ad de 48 89 0a 48 89 72 08 8b 52 f0 85 d2 74 07 83 af 18 31 01 00 01 f3 c3 <0f> 0b 66 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 8b 87 94 00 00 

[ 2720.188013] RIP  [<ffffffffa00be685>] get_free_grant+0x55/0x60 [xen_blkfront]

[ 2720.188013]  RSP <ffff8800ffbc36d8>

[ 2720.188013] ---[ end trace 1b8113c29a7c42df ]---