These two cases are associated with the use of SATA controllers, SATA_AHCI. I hope that I sent to the right people. :)

Domain; /etc/libvirt/qemu/<domain>.xml: <domain type='kvm'> <os> <type arch='x86_64' machine='pc-i440fx-1.6'>hvm</type> </os> <devices> <emulator>/usr/bin/qemu-kvm</emulator> <disk type='file' device='disk'> <driver name='qemu' type='qcow2'/> <source file='/var/lib/libvirt/images/rawhide209.img'/> <target dev='sda' bus='sata'/> <address type='drive' controller='0' bus='0' target='0' unit='0'/> </disk> <controller type='sata' index='0'> <address type='pci' domain='0x0000' bus='0x00' slot='0x09' function='0x0'/> </controller> </devices> </domain>

lspci: 00:09.0 SATA controller [0106]: Intel Corporation 82801IR/IO/IH (ICH9R/DO/DH) 6 port SATA Controller [AHCI mode] [8086:2922] (rev 02)

[ 456.462913] ------------[ cut here ]------------ [ 456.462926] WARNING: CPU: 1 PID: 3772 at lib/dma-debug.c:491 add_dma_entry+0x127/0x130() [ 456.462928] DMA-API: exceeded 7 overlapping mappings of pfn 2137 [ 456.462930] Modules linked in: xfs libcrc32c btrfs fcoe libfcoe libfc scsi_transport_fc scsi_tgt iscsi_ibft iscsi_boot_sysfs iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi dm_crypt vfat fat dm_round_robin dm_multipath raid10 raid456 async_raid6_recov async_memcpy async_pq raid6_pq async_xor xor async_tx raid1 raid0 uinput ip6t_rpfilter ip6t_REJECT xt_conntrack cfg80211 rfkill ebtable_nat ebtable_broute bridge stp llc ebtable_filter ebtables ip6table_nat nf_conntrack_ipv6 nf_defrag_ipv6 nf_nat_ipv6 ip6table_mangle ip6table_security ip6table_raw ip6table_filter ip6_tables iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 nf_nat nf_conntrack iptable_mangle iptable_security iptable_raw ppdev kvm joydev serio_raw snd_hda_intel virtio_console snd_hda_codec snd_hwdep snd_seq snd_seq_device [ 456.462997] snd_pcm parport_pc pvpanic snd_timer parport snd soundcore i2c_piix4 nfsd auth_rpcgss nfs_acl lockd isofs squashfs virtio_balloon virtio_net qxl sym53c8xx drm_kms_helper scsi_transport_spi ttm drm virtio_pci virtio_ring ata_generic i2c_core virtio pata_acpi sunrpc loop [ 456.463039] CPU: 1 PID: 3772 Comm: ext4lazyinit Not tainted 3.14.0-0.rc1.git3.1.fc21.x86_64 #1 [ 456.463042] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 456.463044] 0000000000000000 0000000084feec1b ffff88001c861898 ffffffff817cee9d [ 456.463049] ffff88001c8618e0 ffff88001c8618d0 ffffffff810967cd 0000000000002137 [ 456.463053] ffff88007288d540 0000000000000096 ffffffff82d645c0 0000000000000096 [ 456.463056] Call Trace: [ 456.463063] [<ffffffff817cee9d>] dump_stack+0x4d/0x66 [ 456.463068] [<ffffffff810967cd>] warn_slowpath_common+0x7d/0xa0 [ 456.463071] [<ffffffff8109684c>] warn_slowpath_fmt+0x5c/0x80 [ 456.463075] [<ffffffff813f373d>] ? active_pfn_read_overlap+0x2d/0x50 [ 456.463079] [<ffffffff813f3d07>] add_dma_entry+0x127/0x130 [ 456.463082] [<ffffffff813f43dd>] debug_dma_map_sg+0x13d/0x180 [ 456.463086] [<ffffffff8153f0c1>] ata_qc_issue+0x281/0x3e0 [ 456.463090] [<ffffffff81548395>] ata_scsi_queuecmd+0x135/0x420 [ 456.463094] [<ffffffff81545150>] ? ata_scsi_invalid_field+0x40/0x40 [ 456.463098] [<ffffffff8151b777>] scsi_dispatch_cmd+0xb7/0x4e0 [ 456.463101] [<ffffffff81523bcc>] scsi_request_fn+0x33c/0x540 [ 456.463106] [<ffffffff813956f3>] __blk_run_queue+0x33/0x40 [ 456.463109] [<ffffffff8139b913>] blk_queue_bio+0x343/0x4d0 [ 456.463113] [<ffffffff81395510>] generic_make_request+0xe0/0x130 [ 456.463116] [<ffffffff813955d8>] submit_bio+0x78/0x160 [ 456.463121] [<ffffffff81273628>] ? bio_alloc_bioset+0x1f8/0x2f0 [ 456.463125] [<ffffffff813a311f>] __blkdev_issue_zeroout+0x1ff/0x260 [ 456.463129] [<ffffffff813a3269>] blkdev_issue_zeroout+0xe9/0xf0 [ 456.463133] [<ffffffff81303d9e>] ? __ext4_journal_get_write_access+0x4e/0x90 [ 456.463137] [<ffffffff812ccc1c>] ext4_init_inode_table+0x17c/0x3c0 [ 456.463142] [<ffffffff812e2039>] ? ext4_lazyinit_thread+0xb9/0x320 [ 456.463145] [<ffffffff812e222d>] ext4_lazyinit_thread+0x2ad/0x320 [ 456.463149] [<ffffffff812e1f80>] ? ext4_unregister_li_request+0x70/0x70 [ 456.463153] [<ffffffff810c43ef>] kthread+0xff/0x120 [ 456.463156] [<ffffffff810c42f0>] ? insert_kthread_work+0x80/0x80 [ 456.463160] [<ffffffff817e2c3c>] ret_from_fork+0x7c/0xb0 [ 456.463163] [<ffffffff810c42f0>] ? insert_kthread_work+0x80/0x80 [ 456.463165] ---[ end trace d1e41b42a5f51fa8 ]---

https://bugzilla.redhat.com/attachment.cgi?id=861122

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Bare metal;

lspci: 00:09.0 SATA controller [0106]: NVIDIA Corporation MCP78S [GeForce 8200] AHCI Controller [10de:0ad4] (rev a2)

[ 72.012408] ------------[ cut here ]------------ [ 72.012418] WARNING: CPU: 0 PID: 9502 at lib/dma-debug.c:554 debug_dma_assert_idle+0xc4/0x140() [ 72.012420] ahci 0000:00:09.0: DMA-API: cpu touching an active dma mapped page [pfn=0x943ba] [ 72.012421] Modules linked in: ipt_MASQUERADE iptable_nat nf_nat_ipv4 nf_nat nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack nf_conntrack xt_CHECKSUM iptable_mangle fuse ip6table_filter ip6_tables ebtable_nat ebtables kvm_amd kvm ppdev microcode serio_raw nouveau mxm_wmi video i2c_algo_bit ttm edac_core edac_mce_amd drm_kms_helper k10temp drm parport_serial parport_pc parport wmi shpchp i2c_nforce2 i2c_core acpi_cpufreq nfsd auth_rpcgss nfs_acl lockd sunrpc binfmt_misc ata_generic pata_acpi pata_amd 8021q garp mrp tun bridge stp llc bonding [ 72.012542] CPU: 0 PID: 9502 Comm: ld-linux-x86-64 Not tainted 3.14.0-0.rc1.git5.1.fc21.1.x86_64 #1 [ 72.012544] Hardware name: Gigabyte Technology Co., Ltd. M720-US3/M720-US3, BIOS F7n 09/07/2010 [ 72.012546] 0000000000000000 00000000ff75c10e ffff8800970f3c48 ffffffff817cf05d [ 72.012550] ffff8800970f3c90 ffff8800970f3c80 ffffffff810966cd ffff8800c8dd7600 [ 72.012553] ffff8801286c2f40 00000000000943ba ffffea000255cc00 ffff8800b0756058 [ 72.012556] Call Trace: [ 72.012561] [<ffffffff817cf05d>] dump_stack+0x4d/0x66 [ 72.012565] [<ffffffff810966cd>] warn_slowpath_common+0x7d/0xa0 [ 72.012567] [<ffffffff8109674c>] warn_slowpath_fmt+0x5c/0x80 [ 72.012571] [<ffffffff810f899d>] ? trace_hardirqs_on+0xd/0x10 [ 72.012573] [<ffffffff813f5b24>] debug_dma_assert_idle+0xc4/0x140 [ 72.012576] [<ffffffff811de8b4>] do_wp_page+0xf4/0x7f0 [ 72.012578] [<ffffffff811e130c>] handle_mm_fault+0x66c/0xe90 [ 72.012582] [<ffffffff817dce53>] __do_page_fault+0x183/0x600 [ 72.012585] [<ffffffff810246c5>] ? native_sched_clock+0x35/0xa0 [ 72.012588] [<ffffffff81024739>] ? sched_clock+0x9/0x10 [ 72.012590] [<ffffffff810dd465>] ? local_clock+0x25/0x30 [ 72.012593] [<ffffffff810f5c6f>] ? lock_release_holdtime.part.29+0xf/0x190 [ 72.012595] [<ffffffff817d9018>] ? retint_swapgs+0x13/0x1b [ 72.012598] [<ffffffff813d55da>] ? trace_hardirqs_off_thunk+0x3a/0x3c [ 72.012601] [<ffffffff817dd2de>] do_page_fault+0xe/0x10 [ 72.012603] [<ffffffff817d9338>] page_fault+0x28/0x30 [ 72.012605] ---[ end trace 48bb75765e35d9de ]--- [ 72.012606] Mapped at: [ 72.012607] [<ffffffff813f42f9>] debug_dma_map_sg+0x159/0x180 [ 72.012609] [<ffffffff8153f151>] ata_qc_issue+0x281/0x3e0 [ 72.012613] [<ffffffff81548425>] ata_scsi_queuecmd+0x135/0x420 [ 72.012616] [<ffffffff8151b807>] scsi_dispatch_cmd+0xb7/0x4e0 [ 72.012619] [<ffffffff81523c5c>] scsi_request_fn+0x33c/0x540

https://bugzilla.redhat.com/show_bug.cgi?id=1063059

poma