Message-ID: <CAGsgmAV9Emzqh9GE7Gfq7w9C_gjboLXQYqzfjircYCFR8ESUmQ@mail.gmail.com>
Date:   Wed, 12 Jul 2017 09:20:42 +0200
From:   Mateusz S <muttdini@...il.com>
To:     linux-ext4@...r.kernel.org
Subject: PROBLEM: lseek64 with SEEK_HOLE and negative offset causes EUCLEAN error

[1.] One line summary of the problem:
Calling lseek64 with SEEK_HOLE and negative offset on ext filesystems
returns with EUCLEAN error.

[2.] Full description of the problem/report:
Calling lseek64 with SEEK_HOLE and negative offset, on truncated file,
on ext filesystems returns with EUCLEAN error.
This seems to happen only on ext filesystems (ext2, ext3, ext4).
I have tested with btrfs, ext2-4, f2fs, fat32, jfs, nilfs2, reiserfs,
tmpfs, xfs and it only happens on ext.
This does not happen for me on 4.4.75 kernel, but it happens on 4.9.35
and newer.
I tried reproducing it on:
- Manjaro Linux machine with various kernels
- Arch Linux with 4.11.9 kernel
- Ubuntu 17.04 virtual machine on QEMU/KVM with 4.10.0-26 kernel
- Ubuntu 16.04 machine
and it reproduced on each of them (except from Manjaro with 4.4.75 kernel).

[3.] Keywords (i.e., modules, networking, kernel):
filesystem, fs, kernel

[4.] Kernel version (from /proc/version):
(output from Ubuntu 17.04 Virtual Machine)
Linux version 4.10.0-26-generic (buildd@...01-09) (gcc version 6.3.0
20170406 (Ubuntu 6.3.0-12ubuntu2) ) #30-Ubuntu SMP Tue Jun 27 09:30:12
UTC 2017

[6.] A small shell script or example program which triggers the
     problem (if possible)

C++ code:
#include <errno.h>
#include <fcntl.h>
#include <string>
#include <string.h>
#include <stdio.h>
#include <unistd.h>
#include <sys/stat.h>
#include <sys/types.h>

using namespace std;

int main(int argc, char** argv)
{
    string targetdir = argv[1];
    creat((targetdir + "/file").c_str(), 0777);
    int file = open((targetdir + "/file").c_str(), O_RDWR);

    errno = 0;
    off64_t lseekres = lseek64(file, -1, SEEK_HOLE);
    printf("lseek(%i, -1, SEEK_HOLE) = %lli\terrno: %i (%s)\n", file,
lseekres, errno, strerror(errno));

    return 0;
}

Run command:
./program /home/user/directory-on-ext-filesystem

Output:
lseek(4, -1, SEEK_HOLE) = -1    errno: 117 (Structure needs cleaning)

[7.] Environment
[7.1.] Software (add the output of the ver_linux script here)
(output from Ubuntu VM)

If some fields are empty or look unusual you may have an old version.
Compare to the current minimal requirements in Documentation/Changes.

DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=17.04
DISTRIB_CODENAME=zesty
DISTRIB_DESCRIPTION="Ubuntu 17.04"
NAME="Ubuntu"
VERSION="17.04 (Zesty Zapus)"
ID=ubuntu
ID_LIKE=debian
PRETTY_NAME="Ubuntu 17.04"
VERSION_ID="17.04"
HOME_URL="https://www.ubuntu.com/"
SUPPORT_URL="https://help.ubuntu.com/"
BUG_REPORT_URL="https://bugs.launchpad.net/ubuntu/"
PRIVACY_POLICY_URL="https://www.ubuntu.com/legal/terms-and-policies/privacy-policy"
VERSION_CODENAME=zesty
UBUNTU_CODENAME=zesty
Linux ubuntu 4.10.0-26-generic #30-Ubuntu SMP Tue Jun 27 09:30:12 UTC
2017 x86_64 x86_64 x86_64 GNU/Linux

Gnu C                  gcc (Ubuntu 6.3.0-12ubuntu2) 6.3.0 20170406
util-linux             linux 2.29
mount                  linux 2.29 (libmount 2.29.: selinux, btrfs,
assert, debug)
modutils               22
e2fsprogs              1.43.4
Linux C Library        > libc.2.24
Dynamic linker (ldd)   2.24
Procps                 3.3.12
Net-tools              2.10-alpha
iproute2              iproute2-ss161212
Kbd                    2.0.3
Sh-utils               8.26
Modules Loaded         ebtable_filter ebtables ip6table_filter
ip6_tables iptable_filter ppdev snd_hda_codec_generic snd_hda_intel
snd_hda_codec snd_hda_core snd_hwdep snd_pcm snd_timer snd input_leds
soundcore serio_raw i2c_piix4 parport_pc parport qemu_fw_cfg mac_hid
ib_iser rdma_cm iw_cm ib_cm ib_core configfs iscsi_tcp libiscsi_tcp
libiscsi scsi_transport_iscsi ip_tables x_tables autofs4 btrfs raid10
raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor
raid6_pq libcrc32c raid1 raid0 multipath linear crct10dif_pclmul
crc32_pclmul ghash_clmulni_intel pcbc 8139too aesni_intel aes_x86_64
crypto_simd glue_helper cryptd psmouse qxl ttm drm_kms_helper
syscopyarea sysfillrect floppy sysimgblt fb_sys_fops 8139cp mii
pata_acpi drm

free reports:
              total        used        free      shared  buff/cache   available
Mem:        2045740       92516     1464428        3272      488796     1796256
Swap:        969960           0      969960

[7.2.] Processor information (from /proc/cpuinfo):
/proc/cpuinfo
processor    : 0
vendor_id    : GenuineIntel
cpu family    : 6
model        : 94
model name    : Intel Core Processor (Skylake)
stepping    : 3
microcode    : 0x1
cpu MHz        : 3408.000
cache size    : 16384 KB
physical id    : 0
siblings    : 1
core id        : 0
cpu cores    : 1
apicid        : 0
initial apicid    : 0
fpu        : yes
fpu_exception    : yes
cpuid level    : 13
wp        : yes
flags        : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge
mca cmov pat pse36 clflush mmx fxsr sse sse2 syscall nx rdtscp lm
constant_tsc rep_good nopl xtopology pni pclmulqdq ssse3 fma cx16 pcid
sse4_1 sse4_2 x2apic movbe popcnt tsc_deadline_timer aes xsave avx
f16c rdrand hypervisor lahf_lm abm 3dnowprefetch fsgsbase bmi1 hle
avx2 smep bmi2 erms invpcid rtm mpx rdseed adx smap xsaveopt xsavec
xgetbv1 arat
bugs        :
bogomips    : 6816.00
clflush size    : 64
cache_alignment    : 64
address sizes    : 40 bits physical, 48 bits virtual
power management:

processor    : 1
vendor_id    : GenuineIntel
cpu family    : 6
model        : 94
model name    : Intel Core Processor (Skylake)
stepping    : 3
microcode    : 0x1
cpu MHz        : 3408.000
cache size    : 16384 KB
physical id    : 1
siblings    : 1
core id        : 0
cpu cores    : 1
apicid        : 1
initial apicid    : 1
fpu        : yes
fpu_exception    : yes
cpuid level    : 13
wp        : yes
flags        : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge
mca cmov pat pse36 clflush mmx fxsr sse sse2 syscall nx rdtscp lm
constant_tsc rep_good nopl xtopology pni pclmulqdq ssse3 fma cx16 pcid
sse4_1 sse4_2 x2apic movbe popcnt tsc_deadline_timer aes xsave avx
f16c rdrand hypervisor lahf_lm abm 3dnowprefetch fsgsbase bmi1 hle
avx2 smep bmi2 erms invpcid rtm mpx rdseed adx smap xsaveopt xsavec
xgetbv1 arat
bugs        :
bogomips    : 6816.00
clflush size    : 64
cache_alignment    : 64
address sizes    : 40 bits physical, 48 bits virtual
power management:

[7.3.] Module information (from /proc/modules):
ebtable_filter 16384 0 - Live 0x0000000000000000
ebtables 36864 1 ebtable_filter, Live 0x0000000000000000
ip6table_filter 16384 0 - Live 0x0000000000000000
ip6_tables 28672 1 ip6table_filter, Live 0x0000000000000000
iptable_filter 16384 0 - Live 0x0000000000000000
ppdev 20480 0 - Live 0x0000000000000000
snd_hda_codec_generic 73728 1 - Live 0x0000000000000000
snd_hda_intel 36864 0 - Live 0x0000000000000000
snd_hda_codec 126976 2 snd_hda_codec_generic,snd_hda_intel, Live
0x0000000000000000
snd_hda_core 81920 3
snd_hda_codec_generic,snd_hda_intel,snd_hda_codec, Live
0x0000000000000000
snd_hwdep 16384 1 snd_hda_codec, Live 0x0000000000000000
snd_pcm 102400 3 snd_hda_intel,snd_hda_codec,snd_hda_core, Live
0x0000000000000000
snd_timer 32768 1 snd_pcm, Live 0x0000000000000000
snd 77824 6 snd_hda_codec_generic,snd_hda_intel,snd_hda_codec,snd_hwdep,snd_pcm,snd_timer,
Live 0x0000000000000000
input_leds 16384 0 - Live 0x0000000000000000
soundcore 16384 1 snd, Live 0x0000000000000000
serio_raw 16384 0 - Live 0x0000000000000000
i2c_piix4 24576 0 - Live 0x0000000000000000
parport_pc 32768 0 - Live 0x0000000000000000
parport 49152 2 ppdev,parport_pc, Live 0x0000000000000000
qemu_fw_cfg 16384 0 - Live 0x0000000000000000
mac_hid 16384 0 - Live 0x0000000000000000
ib_iser 49152 0 - Live 0x0000000000000000
rdma_cm 53248 1 ib_iser, Live 0x0000000000000000
iw_cm 45056 1 rdma_cm, Live 0x0000000000000000
ib_cm 49152 1 rdma_cm, Live 0x0000000000000000
ib_core 196608 4 ib_iser,rdma_cm,iw_cm,ib_cm, Live 0x0000000000000000
configfs 36864 2 rdma_cm, Live 0x0000000000000000
iscsi_tcp 20480 0 - Live 0x0000000000000000
libiscsi_tcp 20480 1 iscsi_tcp, Live 0x0000000000000000
libiscsi 57344 3 ib_iser,iscsi_tcp,libiscsi_tcp, Live 0x0000000000000000
scsi_transport_iscsi 98304 4 ib_iser,iscsi_tcp,libiscsi, Live 0x0000000000000000
ip_tables 24576 1 iptable_filter, Live 0x0000000000000000
x_tables 36864 5
ebtables,ip6table_filter,ip6_tables,iptable_filter,ip_tables, Live
0x0000000000000000
autofs4 40960 2 - Live 0x0000000000000000
btrfs 1093632 0 - Live 0x0000000000000000
raid10 49152 0 - Live 0x0000000000000000
raid456 131072 0 - Live 0x0000000000000000
async_raid6_recov 20480 1 raid456, Live 0x0000000000000000
async_memcpy 16384 2 raid456,async_raid6_recov, Live 0x0000000000000000
async_pq 16384 2 raid456,async_raid6_recov, Live 0x0000000000000000
async_xor 16384 3 raid456,async_raid6_recov,async_pq, Live 0x0000000000000000
async_tx 16384 5
raid456,async_raid6_recov,async_memcpy,async_pq,async_xor, Live
0x0000000000000000
xor 24576 2 btrfs,async_xor, Live 0x0000000000000000
raid6_pq 114688 4 btrfs,raid456,async_raid6_recov,async_pq, Live
0x0000000000000000
libcrc32c 16384 1 raid456, Live 0x0000000000000000
raid1 40960 0 - Live 0x0000000000000000
raid0 20480 0 - Live 0x0000000000000000
multipath 16384 0 - Live 0x0000000000000000
linear 16384 0 - Live 0x0000000000000000
crct10dif_pclmul 16384 0 - Live 0x0000000000000000
crc32_pclmul 16384 0 - Live 0x0000000000000000
ghash_clmulni_intel 16384 0 - Live 0x0000000000000000
pcbc 16384 0 - Live 0x0000000000000000
8139too 36864 0 - Live 0x0000000000000000
aesni_intel 167936 0 - Live 0x0000000000000000
aes_x86_64 20480 1 aesni_intel, Live 0x0000000000000000
crypto_simd 16384 1 aesni_intel, Live 0x0000000000000000
glue_helper 16384 1 aesni_intel, Live 0x0000000000000000
cryptd 24576 3 ghash_clmulni_intel,aesni_intel,crypto_simd, Live
0x0000000000000000
psmouse 139264 0 - Live 0x0000000000000000
qxl 69632 1 - Live 0x0000000000000000
ttm 98304 1 qxl, Live 0x0000000000000000
drm_kms_helper 151552 1 qxl, Live 0x0000000000000000
syscopyarea 16384 1 drm_kms_helper, Live 0x0000000000000000
sysfillrect 16384 1 drm_kms_helper, Live 0x0000000000000000
floppy 77824 0 - Live 0x0000000000000000
sysimgblt 16384 1 drm_kms_helper, Live 0x0000000000000000
fb_sys_fops 16384 1 drm_kms_helper, Live 0x0000000000000000
8139cp 28672 0 - Live 0x0000000000000000
mii 16384 2 8139too,8139cp, Live 0x0000000000000000
pata_acpi 16384 0 - Live 0x0000000000000000
drm 352256 4 qxl,ttm,drm_kms_helper, Live 0x0000000000000000

[7.4.] Loaded driver and hardware information (/proc/ioports, /proc/iomem)
0000-0000 : PCI Bus 0000:00
  0000-0000 : dma1
  0000-0000 : pic1
  0000-0000 : timer0
  0000-0000 : timer1
  0000-0000 : keyboard
  0000-0000 : keyboard
  0000-0000 : rtc0
  0000-0000 : dma page reg
  0000-0000 : pic2
  0000-0000 : dma2
  0000-0000 : fpu
  0000-0000 : 0000:00:01.1
    0000-0000 : ata_piix
  0000-0000 : 0000:00:01.1
    0000-0000 : ata_piix
  0000-0000 : 0000:00:01.1
    0000-0000 : ata_piix
  0000-0000 : vesafb
  0000-0000 : floppy
  0000-0000 : floppy
  0000-0000 : 0000:00:01.1
    0000-0000 : ata_piix
  0000-0000 : floppy
  0000-0000 : serial
  0000-0000 : QEMU0002:00
    0000-0000 : fw_cfg_io
  0000-0000 : 0000:00:01.3
    0000-0000 : ACPI PM1a_EVT_BLK
    0000-0000 : ACPI PM1a_CNT_BLK
    0000-0000 : ACPI PM_TMR
  0000-0000 : 0000:00:01.3
    0000-0000 : piix4_smbus
0000-0000 : PCI conf1
0000-0000 : PCI Bus 0000:00
  0000-0000 : ACPI GPE0_BLK
  0000-0000 : 0000:00:03.0
    0000-0000 : 8139cp
  0000-0000 : 0000:00:06.0
  0000-0000 : 0000:00:02.0
  0000-0000 : 0000:00:05.0
    0000-0000 : uhci_hcd
  0000-0000 : 0000:00:05.1
    0000-0000 : uhci_hcd
  0000-0000 : 0000:00:05.2
    0000-0000 : uhci_hcd
  0000-0000 : 0000:00:07.0
  0000-0000 : 0000:00:01.1
    0000-0000 : ata_piix

[7.5.] PCI information ('lspci -vvv' as root)
00:00.0 Host bridge: Intel Corporation 440FX - 82441FX PMC [Natoma] (rev 02)
    Subsystem: Red Hat, Inc Qemu virtual machine
    Control: I/O+ Mem+ BusMaster- SpecCycle- MemWINV- VGASnoop-
ParErr- Stepping- SERR+ FastB2B- DisINTx-
    Status: Cap- 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort-
<TAbort- <MAbort- >SERR- <PERR- INTx-

00:01.0 ISA bridge: Intel Corporation 82371SB PIIX3 ISA [Natoma/Triton II]
    Subsystem: Red Hat, Inc Qemu virtual machine
    Control: I/O+ Mem+ BusMaster- SpecCycle- MemWINV- VGASnoop-
ParErr- Stepping- SERR+ FastB2B- DisINTx-
    Status: Cap- 66MHz- UDF- FastB2B- ParErr- DEVSEL=medium >TAbort-
<TAbort- <MAbort- >SERR- <PERR- INTx-

00:01.1 IDE interface: Intel Corporation 82371SB PIIX3 IDE
[Natoma/Triton II] (prog-if 80 [Master])
    Subsystem: Red Hat, Inc Qemu virtual machine
    Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop-
ParErr- Stepping- SERR+ FastB2B- DisINTx-
    Status: Cap- 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort-
<TAbort- <MAbort- >SERR- <PERR- INTx-
    Latency: 0
    Region 0: [virtual] Memory at 000001f0 (32-bit, non-prefetchable) [size=8]
    Region 1: [virtual] Memory at 000003f0 (type 3, non-prefetchable)
    Region 2: [virtual] Memory at 00000170 (32-bit, non-prefetchable) [size=8]
    Region 3: [virtual] Memory at 00000370 (type 3, non-prefetchable)
    Region 4: I/O ports at c1e0 [size=16]
    Kernel driver in use: ata_piix
    Kernel modules: pata_acpi

00:01.3 Bridge: Intel Corporation 82371AB/EB/MB PIIX4 ACPI (rev 03)
    Subsystem: Red Hat, Inc Qemu virtual machine
    Control: I/O+ Mem+ BusMaster- SpecCycle- MemWINV- VGASnoop-
ParErr- Stepping- SERR+ FastB2B- DisINTx-
    Status: Cap- 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort-
<TAbort- <MAbort- >SERR- <PERR- INTx-
    Interrupt: pin A routed to IRQ 9
    Kernel driver in use: piix4_smbus
    Kernel modules: i2c_piix4

00:02.0 VGA compatible controller: Red Hat, Inc. QXL paravirtual
graphic card (rev 04) (prog-if 00 [VGA controller])
    Subsystem: Red Hat, Inc QEMU Virtual Machine
    Control: I/O+ Mem+ BusMaster- SpecCycle- MemWINV- VGASnoop-
ParErr- Stepping- SERR+ FastB2B- DisINTx-
    Status: Cap- 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort-
<TAbort- <MAbort- >SERR- <PERR- INTx-
    Interrupt: pin A routed to IRQ 11
    Region 0: Memory at f4000000 (32-bit, non-prefetchable) [size=64M]
    Region 1: Memory at f8000000 (32-bit, non-prefetchable) [size=64M]
    Region 2: Memory at fc054000 (32-bit, non-prefetchable) [size=8K]
    Region 3: I/O ports at c140 [size=32]
    Expansion ROM at 000c0000 [disabled] [size=128K]
    Kernel driver in use: qxl
    Kernel modules: qxl

00:03.0 Ethernet controller: Realtek Semiconductor Co., Ltd.
RTL-8100/8101L/8139 PCI Fast Ethernet Adapter (rev 20)
    Subsystem: Red Hat, Inc QEMU Virtual Machine
    Physical Slot: 3
    Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop-
ParErr- Stepping- SERR+ FastB2B- DisINTx-
    Status: Cap- 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort-
<TAbort- <MAbort- >SERR- <PERR- INTx-
    Latency: 0, Cache Line Size: 64 bytes
    Interrupt: pin A routed to IRQ 11
    Region 0: I/O ports at c000 [size=256]
    Region 1: Memory at fc056000 (32-bit, non-prefetchable) [size=256]
    Expansion ROM at fc000000 [disabled] [size=256K]
    Kernel driver in use: 8139cp
    Kernel modules: 8139cp, 8139too

00:04.0 Audio device: Intel Corporation 82801FB/FBM/FR/FW/FRW (ICH6
Family) High Definition Audio Controller (rev 01)
    Subsystem: Red Hat, Inc QEMU Virtual Machine
    Physical Slot: 4
    Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop-
ParErr- Stepping- SERR+ FastB2B- DisINTx+
    Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort-
<TAbort- <MAbort- >SERR- <PERR- INTx-
    Latency: 0
    Interrupt: pin A routed to IRQ 26
    Region 0: Memory at fc050000 (32-bit, non-prefetchable) [size=16K]
    Capabilities: [60] MSI: Enable+ Count=1/1 Maskable- 64bit+
        Address: 00000000fee00000  Data: 4061
    Kernel driver in use: snd_hda_intel
    Kernel modules: snd_hda_intel

00:05.0 USB controller: Intel Corporation 82801I (ICH9 Family) USB
UHCI Controller #1 (rev 03) (prog-if 00 [UHCI])
    Subsystem: Red Hat, Inc QEMU Virtual Machine
    Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop-
ParErr- Stepping- SERR+ FastB2B- DisINTx-
    Status: Cap- 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort-
<TAbort- <MAbort- >SERR- <PERR- INTx-
    Latency: 0
    Interrupt: pin A routed to IRQ 10
    Region 4: I/O ports at c160 [size=32]
    Kernel driver in use: uhci_hcd

00:05.1 USB controller: Intel Corporation 82801I (ICH9 Family) USB
UHCI Controller #2 (rev 03) (prog-if 00 [UHCI])
    Subsystem: Red Hat, Inc QEMU Virtual Machine
    Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop-
ParErr- Stepping- SERR+ FastB2B- DisINTx-
    Status: Cap- 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort-
<TAbort- <MAbort- >SERR- <PERR- INTx-
    Latency: 0
    Interrupt: pin B routed to IRQ 11
    Region 4: I/O ports at c180 [size=32]
    Kernel driver in use: uhci_hcd

00:05.2 USB controller: Intel Corporation 82801I (ICH9 Family) USB
UHCI Controller #3 (rev 03) (prog-if 00 [UHCI])
    Subsystem: Red Hat, Inc QEMU Virtual Machine
    Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop-
ParErr- Stepping- SERR+ FastB2B- DisINTx-
    Status: Cap- 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort-
<TAbort- <MAbort- >SERR- <PERR- INTx-
    Latency: 0
    Interrupt: pin C routed to IRQ 11
    Region 4: I/O ports at c1a0 [size=32]
    Kernel driver in use: uhci_hcd

00:05.7 USB controller: Intel Corporation 82801I (ICH9 Family) USB2
EHCI Controller #1 (rev 03) (prog-if 20 [EHCI])
    Subsystem: Red Hat, Inc QEMU Virtual Machine
    Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop-
ParErr- Stepping- SERR+ FastB2B- DisINTx-
    Status: Cap- 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort-
<TAbort- <MAbort- >SERR- <PERR- INTx-
    Latency: 0, Cache Line Size: 64 bytes
    Interrupt: pin D routed to IRQ 10
    Region 0: Memory at fc057000 (32-bit, non-prefetchable) [size=4K]
    Kernel driver in use: ehci-pci

00:06.0 Communication controller: Red Hat, Inc Virtio console
    Subsystem: Red Hat, Inc Virtio console
    Physical Slot: 6
    Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop-
ParErr- Stepping- SERR+ FastB2B- DisINTx+
    Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort-
<TAbort- <MAbort- >SERR- <PERR- INTx-
    Latency: 0
    Interrupt: pin A routed to IRQ 11
    Region 0: I/O ports at c100 [size=64]
    Region 1: Memory at fc058000 (32-bit, non-prefetchable) [size=4K]
    Region 4: Memory at febf8000 (64-bit, prefetchable) [size=16K]
    Capabilities: [98] MSI-X: Enable+ Count=2 Masked-
        Vector table: BAR=1 offset=00000000
        PBA: BAR=1 offset=00000800
    Capabilities: [84] Vendor Specific Information: VirtIO: <unknown>
        BAR=0 offset=00000000 size=00000000
    Capabilities: [70] Vendor Specific Information: VirtIO: Notify
        BAR=4 offset=00003000 size=00001000 multiplier=00000004
    Capabilities: [60] Vendor Specific Information: VirtIO: DeviceCfg
        BAR=4 offset=00002000 size=00001000
    Capabilities: [50] Vendor Specific Information: VirtIO: ISR
        BAR=4 offset=00001000 size=00001000
    Capabilities: [40] Vendor Specific Information: VirtIO: CommonCfg
        BAR=4 offset=00000000 size=00001000
    Kernel driver in use: virtio-pci

00:07.0 Unclassified device [00ff]: Red Hat, Inc Virtio memory balloon
    Subsystem: Red Hat, Inc Virtio memory balloon
    Physical Slot: 7
    Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop-
ParErr- Stepping- SERR+ FastB2B- DisINTx-
    Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort-
<TAbort- <MAbort- >SERR- <PERR- INTx-
    Latency: 0
    Interrupt: pin A routed to IRQ 11
    Region 0: I/O ports at c1c0 [size=32]
    Region 4: Memory at febfc000 (64-bit, prefetchable) [size=16K]
    Capabilities: [84] Vendor Specific Information: VirtIO: <unknown>
        BAR=0 offset=00000000 size=00000000
    Capabilities: [70] Vendor Specific Information: VirtIO: Notify
        BAR=4 offset=00003000 size=00001000 multiplier=00000004
    Capabilities: [60] Vendor Specific Information: VirtIO: DeviceCfg
        BAR=4 offset=00002000 size=00001000
    Capabilities: [50] Vendor Specific Information: VirtIO: ISR
        BAR=4 offset=00001000 size=00001000
    Capabilities: [40] Vendor Specific Information: VirtIO: CommonCfg
        BAR=4 offset=00000000 size=00001000
    Kernel driver in use: virtio-pci

[7.6.] SCSI information (from /proc/scsi/scsi)
Attached devices:
Host: scsi0 Channel: 00 Id: 00 Lun: 00
  Vendor: ATA      Model: QEMU HARDDISK    Rev: 2.5+
  Type:   Direct-Access                    ANSI  SCSI revision: 05
Host: scsi0 Channel: 00 Id: 01 Lun: 00
  Vendor: QEMU     Model: QEMU DVD-ROM     Rev: 2.5+
  Type:   CD-ROM                           ANSI  SCSI revision: 05

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