http://bugzilla.suse.com/show_bug.cgi?id=1048348
http://bugzilla.suse.com/show_bug.cgi?id=1048348#c18
--- Comment #18 from Bruno Friedmann ---
Just before trying to test the kernel:head here what I've found in dmesg
(several time the same error, at different time)
kernel 4.4.76-1.g27249f3-default
[495980.069958] AMD-Vi: Command buffer timeout
[496013.970631] AMD-Vi: Command buffer timeout
[496013.970649] ------------[ cut here ]------------
[496013.970660] WARNING: CPU: 3 PID: 0 at ../drivers/iommu/amd_iommu.c:1287
__domain_flush_pages+0x15c/0x160()
[496013.970711] Modules linked in: dm_crypt nls_iso8859_1 nls_cp437 vfat fat
binfmt_misc vhost_net vhost macvtap macvlan fuse af_packet ip6t_MASQUERADE
nf_nat_masquerade_ipv6 ip6t_rpfilter ebtable_filter ebtables ip6t_ipv6header
act_police cls_basic cls_flow cls_fw cls_u32 sch_fq_codel sch_tbf sch_prio
sch_htb sch_hfsc sch_ingress sch_sfq xt_NETMAP xt_iface(O) xt_TARPIT(O)
xt_CHECKSUM xt_nfacct nfnetlink_acct ipt_rpfilter xt_geoip(O) xt_statistic
xt_CT xt_condition(O) xt_ACCOUNT(O) xt_LOGMARK(O) xt_connlimit xt_realm
xt_addrtype ip_set_hash_ip(O) xt_IPMARK(O) xt_comment xt_ipp2p(O)
compat_xtables(O) xt_recent ipt_REJECT nf_reject_ipv4 ipt_MASQUERADE
nf_nat_masquerade_ipv4 ipt_ECN ipt_CLUSTERIP ipt_ah ip6table_nat nf_log_ipv4
nf_nat_tftp nf_nat_snmp_basic nf_conntrack_snmp nf_nat_sip nf_nat_pptp
nf_nat_proto_gre
[496013.970712] nf_nat_irc nf_nat_h323 xt_set(O) ip_set(O) nf_nat_ftp xt_NFLOG
nf_nat_amanda xt_LOG nf_log_ipv6 nf_log_common nf_conntrack_tftp
nf_conntrack_sip nf_conntrack_sane nf_conntrack_proto_udplite
nf_conntrack_proto_sctp nf_conntrack_pptp nf_conntrack_proto_gre
nf_conntrack_netlink nf_conntrack_netbios_ns nf_conntrack_broadcast
nf_conntrack_irc nf_conntrack_h323 ts_kmp nf_conntrack_ftp nf_conntrack_amanda
xt_TPROXY xt_time xt_TCPMSS xt_tcpmss xt_sctp xt_policy xt_pkttype xt_physdev
xt_owner xt_NFQUEUE xt_nat xt_multiport xt_mark xt_mac xt_limit xt_length
xt_iprange xt_helper xt_hashlimit xt_DSCP xt_dscp xt_dccp ip6t_REJECT
nf_reject_ipv6 xt_connmark xt_CLASSIFY xt_AUDIT nf_nat_ipv6 xt_tcpudp
nf_conntrack_ipv6 nf_defrag_ipv6 xt_state xt_conntrack iptable_raw ip6table_raw
ip6table_mangle iptable_nat
[496013.970846] nf_nat_ipv4 nf_nat nf_conntrack_ipv4 nf_defrag_ipv4
nf_conntrack iptable_mangle iptable_filter ip_tables ip6table_filter ip6_tables
x_tables tun br_netfilter bridge stp llc iscsi_ibft iscsi_boot_sysfs
nfnetlink_log nfnetlink msr it87 hwmon_vid snd_hda_codec_hdmi kvm_amd kvm
irqbypass crct10dif_pclmul crc32_pclmul eeepc_wmi asus_wmi sparse_keymap
ghash_clmulni_intel rfkill video drbg ansi_cprng joydev uas edac_mce_amd
usb_storage aesni_intel aes_x86_64 lrw gf128mul glue_helper ablk_helper cryptd
pcspkr sp5100_tco k10temp edac_core fam15h_power i2c_piix4 e1000e ptp pps_core
shpchp tpm_infineon acpi_cpufreq fjes processor nfsd auth_rpcgss nfs_acl lockd
grace snd_hda_codec_realtek snd_hda_codec_generic snd_hda_intel snd_hda_codec
snd_hda_core snd_hwdep snd_pcm snd_seq snd_seq_device snd_timer
[496013.970992] snd
[496013.970994] sunrpc soundcore ext4 crc16 jbd2 mbcache raid1 hid_generic
usbhid md_mod sd_mod nvidia_drm(PO) nvidia_modeset(PO) ohci_pci nvidia_uvm(PO)
nvidia(PO) drm_kms_helper syscopyarea sysfillrect sysimgblt fb_sys_fops mxm_wmi
crc32c_intel ohci_hcd ehci_pci ehci_hcd ahci xhci_pci libahci xhci_hcd aacraid
usbcore usb_common libata drm wmi button dm_mirror dm_region_hash dm_log sg
dm_multipath dm_mod scsi_dh_rdac scsi_dh_emc scsi_dh_alua scsi_mod efivarfs
autofs4
[496013.971098] CPU: 3 PID: 0 Comm: swapper/3 Tainted: P W O
4.4.76-1.g27249f3-default #1
[496013.971102] Hardware name: To be filled by O.E.M. To be filled by
O.E.M./CROSSHAIR V FORMULA-Z, BIOS 2201 03/23/2015
[496013.971105] 0000000000000000 ffffffff81339d17 0000000000000000
ffffffff81a609a0
[496013.971115] ffffffff810804e1
[496013.971118] ffff88080a2da010 ffff88082ecc3e60 00000000fffffffb
[496013.971126] 0000000000000000
[496013.971133] 7fffffffffffffff ffffffff8146c6ac 3000001300000000
[496013.971136] Call Trace:
[496013.971154] [<ffffffff81019f29>] dump_trace+0x59/0x320
[496013.971164] [<ffffffff8101a2ea>] show_stack_log_lvl+0xfa/0x180
[496013.971170] [<ffffffff8101b091>] show_stack+0x21/0x40
[496013.971178] [<ffffffff81339d17>] dump_stack+0x5c/0x85
[496013.971185] [<ffffffff810804e1>] warn_slowpath_common+0x81/0xb0
[496013.971194] [<ffffffff8146c6ac>] __domain_flush_pages+0x15c/0x160
[496013.971203] [<ffffffff8146c6d4>] dma_ops_domain_flush_tlb+0x24/0x40
[496013.971210] [<ffffffff8146cb87>] queue_flush_timeout+0x27/0xa0
[496013.971216] [<ffffffff810f6af0>] call_timer_fn+0x30/0x140
[496013.971221] [<ffffffff810f8442>] run_timer_softirq+0x222/0x2d0
[496013.971229] [<ffffffff81084ec2>] __do_softirq+0xe2/0x300
[496013.971236] [<ffffffff810853aa>] irq_exit+0xfa/0x110
[496013.971248] [<ffffffff8163310e>] smp_apic_timer_interrupt+0x3e/0x50
[496013.971255] [<ffffffff816311dc>] apic_timer_interrupt+0x8c/0xa0
[496013.975215] DWARF2 unwinder stuck at apic_timer_interrupt+0x8c/0xa0
[496013.975217] Leftover inexact backtrace:
[496013.975235] <IRQ> <EOI> [<ffffffff814ed8f7>] ?
cpuidle_enter_state+0xd7/0x270
[496013.975241] [<ffffffff814ed8d2>] ? cpuidle_enter_state+0xb2/0x270
[496013.975246] [<ffffffff810c5a1d>] ? cpu_startup_entry+0x2ad/0x3a0
[496013.975252] [<ffffffff8104e730>] ? start_secondary+0x150/0x180
[496013.975261] ---[ end trace 9330d8f11add10b7 ]---
[581215.153607] AMD-Vi: Command buffer timeout
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