Bug#930351: linux-image-4.9.0-9-amd64: soft lockup / stuck in pid_revalidate
Package: src:linux
Version: 4.9.168-1+deb9u2
Severity: important
Dear Maintainer,
*** Reporter, please consider answering these questions, where appropriate ***
* What led up to the situation?
ran the server for some days with KVM VMs on top
* What exactly did you do (or not do) that was effective (or
ineffective)?
Tried to ssh + ping.
* What was the outcome of this action?
ssh session got stuck. Ping still worked.
* What outcome did you expect instead?
should work
*** End of the template - remove these template lines ***
-- Package-specific info:
** Version:
Linux version 4.9.0-9-amd64 (debian-kernel@lists.debian.org) (gcc version 6.3.0 20170516 (Debian 6.3.0-18+deb9u1) ) #1 SMP Debian 4.9.168-1+deb9u2 (2019-05-13)
** Command line:
BOOT_IMAGE=/vmlinuz-4.9.0-9-amd64 root=UUID=83dcd5bf-42df-4931-aa7a-e09d8ecf6bb5 ro nomodeset nohz=off panic=30
** Not tainted
** Kernel log:
(obtained via netconsole)
Message from syslogd@golf at Jun 11 06:37:56 ...
kernel:[1616241.072680] NMI watchdog: BUG: soft lockup - CPU#5 stuck for 22s! [ps:28525]
[1626796.848128] CPU: 5 PID: 28525 Comm: ps Tainted: G D L 4.9.0-9-amd64 #1 Debian 4.9.168-1+deb9u2
[1626796.848205] Hardware name: MSI MS-7816/H87-G43 (MS-7816), BIOS V2.14B4 07/31/2013
[1626796.848277] task: ffff88d2c5923080 task.stack: ffff9e7fcf8a4000
[1626796.848337] RIP: 0010:[<ffffffff98ec5bdf>] [<ffffffff98ec5bdf>] native_queued_spin_lock_slowpath+0x10f/0x1a0
[1626796.848459] RSP: 0018:ffff9e7fcf8a7c70 EFLAGS: 00000246
[1626796.848518] RAX: 0000000000000000 RBX: ffff88da78f18140 RCX: 0000000000000003
[1626796.848595] RDX: ffff88da9eb59480 RSI: 0000000000180000 RDI: ffff88da78f18860
[1626796.848673] RBP: ffff88da787e5088 R08: 0000000000000000 R09: ffff88d4fc338025
[1626796.848745] R10: ffff88da9d1b99f8 R11: 0000000000000000 R12: ffff88da78f18860
[1626796.848817] R13: ffff88da786fecc0 R14: ffff9e7fcf8a7d70 R15: ffff88da9d4d44e0
[1626796.848889] FS: 00007f461c3ba880(0000) GS:ffff88da9eb40000(0000) knlGS:0000000000000000
[1626796.848962] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[1626796.849020] CR2: 0000557cc5139688 CR3: 000000007e5f0000 CR4: 0000000000162670
[1626796.849093] Stack:
[1626796.849147] ffffffff9941a79d ffffffff9907e5af ffff9e7fcf8a7d78 ffff9e7fcf8a7de0
[1626796.849370] ffff88da9d1b99c0 ffff9e7fcf8a7d78 ffffffff990175cf ffff9e7fcf8a7d6c
[1626796.849597] ffff9e7fcf8a7de0 ffff9e7fcf8a7cf0 679aab8063728a19 ffff9e7fcf8a7d78
[1626796.849817] Call Trace:
[1626796.849872] [<ffffffff9941a79d>] ? _raw_spin_lock+0x1d/0x20
[1626796.849931] [<ffffffff9907e5af>] ? pid_revalidate+0x4f/0xf0
[1626796.849994] [<ffffffff990175cf>] ? lookup_fast+0x2cf/0x2f0
[1626796.850054] [<ffffffff9901a908>] ? path_openat+0x178/0x15b0
[1626796.850113] [<ffffffff9901c301>] ? filename_lookup+0xf1/0x180
[1626796.850173] [<ffffffff9901d001>] ? do_filp_open+0x91/0x100
[1626796.850233] [<ffffffff99007c9a>] ? __check_object_size+0xfa/0x1d8
[1626796.850294] [<ffffffff9900a50e>] ? do_sys_open+0x12e/0x210
[1626796.850356] [<ffffffff98e03b7d>] ? do_syscall_64+0x8d/0x100
[1626796.850417] [<ffffffff9941a88e>] ? entry_SYSCALL_64_after_swapgs+0x58/0xc6
[1626796.850478] Code: 12 83 e0 03 83 e9 01 48 c1 e0 04 48 63 c9 48 05 80 94 01 00 48 03 04 cd e0 f3 86 99 48 89 10 8b 42 08 85 c0 75 09 f3 90 8b 42 08 <85> c0 74 f7 4c 8b 02 4d 85 c0 74 08 41 0f 18 08 eb 02 f3 90 8b
and another had
[1626780.842859] Call Trace:
[1626780.842914] [<ffffffff9941a79d>] ? _raw_spin_lock+0x1d/0x20
[1626780.842974] [<ffffffff9907e5af>] ? pid_revalidate+0x4f/0xf0
[1626780.843034] [<ffffffff990175cf>] ? lookup_fast+0x2cf/0x2f0
[1626780.843093] [<ffffffff99018334>] ? walk_component+0x44/0x330
[1626780.843153] [<ffffffff990195f7>] ? path_lookupat+0x67/0x120
[1626780.843216] [<ffffffff9901c2c1>] ? filename_lookup+0xb1/0x180
[1626780.843277] [<ffffffff990022f8>] ? mem_cgroup_commit_charge+0x78/0x4b0
[1626780.843340] [<ffffffff99007c9a>] ? __check_object_size+0xfa/0x1d8
[1626780.843401] [<ffffffff99163a38>] ? strncpy_from_user+0x48/0x160
[1626780.843465] [<ffffffff99010cf9>] ? vfs_fstatat+0x59/0xb0
[1626780.843526] [<ffffffff990112ad>] ? SYSC_newlstat+0x2d/0x60
[1626780.843586] [<ffffffff98e03b7d>] ? do_syscall_64+0x8d/0x100
[1626780.843648] [<ffffffff9941a88e>] ? entry_SYSCALL_64_after_swapgs+0x58/0xc6
** Model information
sys_vendor: MSI
product_name: MS-7816
product_version: 1.0
chassis_vendor: MSI
chassis_version: 1.0
bios_vendor: American Megatrends Inc.
bios_version: V2.14B4
board_vendor: MSI
board_name: H87-G43 (MS-7816)
board_version: 1.0
** Loaded modules:
ipt_REJECT
nf_reject_ipv4
iptable_filter
ipt_MASQUERADE
nf_nat_masquerade_ipv4
xt_multiport
xt_nat
xt_tcpudp
iptable_nat
nf_conntrack_ipv4
nf_defrag_ipv4
nf_nat_ipv4
nf_nat
nf_conntrack
ip_tables
x_tables
nfnetlink_queue
nfnetlink_log
nfnetlink
bluetooth
rfkill
cpufreq_conservative
cpufreq_powersave
cpufreq_userspace
algif_skcipher
af_alg
tun
loop
dm_crypt
intel_rapl
x86_pkg_temp_thermal
intel_powerclamp
coretemp
kvm_intel
kvm
irqbypass
crct10dif_pclmul
crc32_pclmul
i915
ghash_clmulni_intel
intel_cstate
iTCO_wdt
iTCO_vendor_support
mei_me
mei
intel_uncore
mxm_wmi
drm_kms_helper
intel_rapl_perf
pcspkr
lpc_ich
drm
evdev
serio_raw
shpchp
wmi
sg
button
mfd_core
video
i2c_algo_bit
ext4
crc16
jbd2
fscrypto
ecb
mbcache
btrfs
raid10
raid456
async_raid6_recov
async_memcpy
async_pq
async_xor
async_tx
xor
raid6_pq
libcrc32c
crc32c_generic
raid0
multipath
linear
dm_mirror
dm_region_hash
dm_log
dm_mod
netconsole
configfs
raid1
md_mod
sd_mod
ahci
libahci
crc32c_intel
aesni_intel
aes_x86_64
glue_helper
lrw
gf128mul
ablk_helper
cryptd
libata
xhci_pci
ehci_pci
ehci_hcd
xhci_hcd
i2c_i801
scsi_mod
i2c_smbus
r8169
mii
usbcore
usb_common
fan
thermal
** PCI devices:
00:00.0 Host bridge [0600]: Intel Corporation 4th Gen Core Processor DRAM Controller [8086:0c00] (rev 06)
Subsystem: Micro-Star International Co., Ltd. [MSI] 4th Gen Core Processor DRAM Controller [1462:7816]
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
Capabilities: <access denied>
Kernel driver in use: hsw_uncore
00:02.0 VGA compatible controller [0300]: Intel Corporation Xeon E3-1200 v3/4th Gen Core Processor Integrated Graphics Controller [8086:0412] (rev 06) (prog-if 00 [VGA controller])
Subsystem: Micro-Star International Co., Ltd. [MSI] Xeon E3-1200 v3/4th Gen Core Processor Integrated Graphics Controller [1462:7816]
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: Memory at f7800000 (64-bit, non-prefetchable) [size=4M]
Region 2: Memory at e0000000 (64-bit, prefetchable) [size=256M]
Region 4: I/O ports at f000 [size=64]
[virtual] Expansion ROM at 000c0000 [disabled] [size=128K]
Capabilities: <access denied>
Kernel modules: i915
00:14.0 USB controller [0c03]: Intel Corporation 8 Series/C220 Series Chipset Family USB xHCI [8086:8c31] (rev 04) (prog-if 30 [XHCI])
Subsystem: Micro-Star International Co., Ltd. [MSI] 8 Series/C220 Series Chipset Family USB xHCI [1462:7816]
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
Interrupt: pin A routed to IRQ 27
Region 0: Memory at f7c00000 (64-bit, non-prefetchable) [size=64K]
Capabilities: <access denied>
Kernel driver in use: xhci_hcd
Kernel modules: xhci_pci
00:16.0 Communication controller [0780]: Intel Corporation 8 Series/C220 Series Chipset Family MEI Controller #1 [8086:8c3a] (rev 04)
Subsystem: Micro-Star International Co., Ltd. [MSI] 8 Series/C220 Series Chipset Family MEI Controller [1462:7816]
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 29
Region 0: Memory at f7c16000 (64-bit, non-prefetchable) [size=16]
Capabilities: <access denied>
Kernel driver in use: mei_me
Kernel modules: mei_me
00:1a.0 USB controller [0c03]: Intel Corporation 8 Series/C220 Series Chipset Family USB EHCI #2 [8086:8c2d] (rev 04) (prog-if 20 [EHCI])
Subsystem: Micro-Star International Co., Ltd. [MSI] 8 Series/C220 Series Chipset Family USB EHCI [1462:7816]
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
Interrupt: pin A routed to IRQ 16
Region 0: Memory at f7c14000 (32-bit, non-prefetchable) [size=1K]
Capabilities: <access denied>
Kernel driver in use: ehci-pci
Kernel modules: ehci_pci
00:1c.0 PCI bridge [0604]: Intel Corporation 8 Series/C220 Series Chipset Family PCI Express Root Port #1 [8086:8c10] (rev d4) (prog-if 00 [Normal decode])
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 16
Bus: primary=00, secondary=01, subordinate=01, sec-latency=0
I/O behind bridge: 00002000-00002fff
Memory behind bridge: df200000-df3fffff
Prefetchable memory behind bridge: 00000000df400000-00000000df5fffff
Secondary status: 66MHz- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort+ <SERR- <PERR-
BridgeCtl: Parity- SERR- NoISA- VGA- MAbort- >Reset- FastB2B-
PriDiscTmr- SecDiscTmr- DiscTmrStat- DiscTmrSERREn-
Capabilities: <access denied>
Kernel driver in use: pcieport
Kernel modules: shpchp
00:1c.1 PCI bridge [0604]: Intel Corporation 8 Series/C220 Series Chipset Family PCI Express Root Port #2 [8086:8c12] (rev d4) (prog-if 00 [Normal decode])
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 B routed to IRQ 17
Bus: primary=00, secondary=02, subordinate=02, sec-latency=0
I/O behind bridge: 0000e000-0000efff
Prefetchable memory behind bridge: 00000000f0000000-00000000f00fffff
Secondary status: 66MHz- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- <SERR- <PERR-
BridgeCtl: Parity- SERR- NoISA- VGA- MAbort- >Reset- FastB2B-
PriDiscTmr- SecDiscTmr- DiscTmrStat- DiscTmrSERREn-
Capabilities: <access denied>
Kernel driver in use: pcieport
Kernel modules: shpchp
00:1c.3 PCI bridge [0604]: Intel Corporation 82801 PCI Bridge [8086:244e] (rev d4) (prog-if 01 [Subtractive decode])
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
Bus: primary=00, secondary=03, subordinate=04, sec-latency=0
Secondary status: 66MHz- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort+ <SERR- <PERR-
BridgeCtl: Parity- SERR- NoISA- VGA- MAbort- >Reset- FastB2B-
PriDiscTmr- SecDiscTmr- DiscTmrStat- DiscTmrSERREn-
Capabilities: <access denied>
00:1d.0 USB controller [0c03]: Intel Corporation 8 Series/C220 Series Chipset Family USB EHCI #1 [8086:8c26] (rev 04) (prog-if 20 [EHCI])
Subsystem: Micro-Star International Co., Ltd. [MSI] 8 Series/C220 Series Chipset Family USB EHCI [1462:7816]
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
Interrupt: pin A routed to IRQ 23
Region 0: Memory at f7c13000 (32-bit, non-prefetchable) [size=1K]
Capabilities: <access denied>
Kernel driver in use: ehci-pci
Kernel modules: ehci_pci
00:1f.0 ISA bridge [0601]: Intel Corporation H87 Express LPC Controller [8086:8c4a] (rev 04)
Subsystem: Micro-Star International Co., Ltd. [MSI] H87 Express LPC Controller [1462:7816]
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
Capabilities: <access denied>
Kernel driver in use: lpc_ich
Kernel modules: lpc_ich
00:1f.2 SATA controller [0106]: Intel Corporation 8 Series/C220 Series Chipset Family 6-port SATA Controller 1 [AHCI mode] [8086:8c02] (rev 04) (prog-if 01 [AHCI 1.0])
Subsystem: Micro-Star International Co., Ltd. [MSI] 8 Series/C220 Series Chipset Family 6-port SATA Controller 1 [AHCI mode] [1462:7816]
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
Interrupt: pin B routed to IRQ 28
Region 0: I/O ports at f0b0 [size=8]
Region 1: I/O ports at f0a0 [size=4]
Region 2: I/O ports at f090 [size=8]
Region 3: I/O ports at f080 [size=4]
Region 4: I/O ports at f060 [size=32]
Region 5: Memory at f7c12000 (32-bit, non-prefetchable) [size=2K]
Capabilities: <access denied>
Kernel driver in use: ahci
Kernel modules: ahci
00:1f.3 SMBus [0c05]: Intel Corporation 8 Series/C220 Series Chipset Family SMBus Controller [8086:8c22] (rev 04)
Subsystem: Micro-Star International Co., Ltd. [MSI] 8 Series/C220 Series Chipset Family SMBus Controller [1462:7816]
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 C routed to IRQ 18
Region 0: Memory at f7c11000 (64-bit, non-prefetchable) [size=256]
Region 4: I/O ports at f040 [size=32]
Kernel driver in use: i801_smbus
Kernel modules: i2c_i801
02:00.0 Ethernet controller [0200]: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller [10ec:8168] (rev 06)
Subsystem: Micro-Star International Co., Ltd. [MSI] RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller [1462:7816]
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 26
Region 0: I/O ports at e000 [size=256]
Region 2: Memory at f0004000 (64-bit, prefetchable) [size=4K]
Region 4: Memory at f0000000 (64-bit, prefetchable) [size=16K]
Capabilities: <access denied>
Kernel driver in use: r8169
Kernel modules: r8169
03:00.0 PCI bridge [0604]: ASMedia Technology Inc. ASM1083/1085 PCIe to PCI Bridge [1b21:1080] (rev 03) (prog-if 00 [Normal decode])
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 10
Bus: primary=03, secondary=04, subordinate=04, sec-latency=32
Secondary status: 66MHz+ FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort+ <SERR- <PERR-
BridgeCtl: Parity- SERR- NoISA- VGA- MAbort- >Reset- FastB2B-
PriDiscTmr- SecDiscTmr- DiscTmrStat- DiscTmrSERREn-
Capabilities: <access denied>
Kernel modules: shpchp
** USB devices:
Bus 002 Device 002: ID 8087:8000 Intel Corp.
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 001 Device 002: ID 8087:8008 Intel Corp.
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 004 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
-- System Information:
Debian Release: 9.9
APT prefers stable
APT policy: (500, 'stable')
Architecture: amd64 (x86_64)
Kernel: Linux 4.9.0-9-amd64 (SMP w/8 CPU cores)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_DK.utf8 (charmap=UTF-8), LANGUAGE=en_US.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: sysvinit (via /sbin/init)
Versions of packages linux-image-4.9.0-9-amd64 depends on:
ii initramfs-tools [linux-initramfs-tool] 0.130
ii kmod 23-2
ii linux-base 4.5
Versions of packages linux-image-4.9.0-9-amd64 recommends:
ii firmware-linux-free 3.4
ii irqbalance 1.1.0-2.3
Versions of packages linux-image-4.9.0-9-amd64 suggests:
pn debian-kernel-handbook <none>
ii grub-pc 2.02~beta3-5+deb9u1
pn linux-doc-4.9 <none>
Versions of packages linux-image-4.9.0-9-amd64 is related to:
pn firmware-amd-graphics <none>
pn firmware-atheros <none>
pn firmware-bnx2 <none>
pn firmware-bnx2x <none>
pn firmware-brcm80211 <none>
pn firmware-cavium <none>
pn firmware-intel-sound <none>
pn firmware-intelwimax <none>
pn firmware-ipw2x00 <none>
pn firmware-ivtv <none>
pn firmware-iwlwifi <none>
pn firmware-libertas <none>
pn firmware-linux-nonfree <none>
pn firmware-misc-nonfree <none>
pn firmware-myricom <none>
pn firmware-netxen <none>
pn firmware-qlogic <none>
ii firmware-realtek 20161130-5
pn firmware-samsung <none>
pn firmware-siano <none>
pn firmware-ti-connectivity <none>
pn xen-hypervisor <none>
-- no debconf information
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