Package: src:linux
Version: 4.19.37-5+deb10u1
Dear Maintainer,
* What led up to the situation?
The upgrade of a Xen host from Stretch to Buster.
* What was the outcome of this action?
After the upgrade from Stretch to Buster of the host (dom0), several domUs
developed
file system errors leading to file system corruption, causing the domUs to
remount in read-only mode.
It should be noted that Buster has Xen 4.11, allowing PHV(v2) mode, while
Stretch has Xen 4.8,
not allowing that mode. It was decided to switch supported Debian Linux
domUs from PV mode
to PVH mode after the upgrade. Xen PVH mode requires at least a Linux 4.11
domU kernel.
This requirement was satisfied by the stretch-backports
linux-image-4.19.0-0.bpo.5-amd64 kernel.
The domUs were configured to use drbd on lvm2 storage on an HP Smart Array
P410i controller using the
'hpsa' driver.
The domUs were configured with a swap file.
The domUs were started with the default XEN PV(H) configuration using a
kernel provided by the hypervisor, e.g.:
type = 'pvh'
kernel = '/boot/vmlinuz-4.19.0-0.bpo.5-amd64'
ramdisk = '/boot/initrd.img-4.19.0-0.bpo.5-amd64'
extra = 'elevator=noop noresume'
root = '/dev/xvda2 ro'
disk = 'drbd:volume,xvda2,w'
The file system corruption developed in a matter of days after starting the
domUs in PVH mode.
Output of /sys/block/drbd[n]/queue/scheduler (dom0): none
Output of /sys/module/scsi_mod/parameters/use_blk_mq (dom0): Y
The issue occurred only in Stretch domUs that were using the
stretch-backports
linux-image-4.19.0-0.bpo.5-amd64 kernel (as opposed to the standard stretch
4.9 kernel)
and only in PVH mode.
No information specific to the issue was found in either the dom0 or domU
log files nor the dom0 kernel log.
Information from the domU kernel log (dmesg) was not preserved.
* What outcome did you expect instead?
The expected outcome had been that after upgrading the Stretch host
to Buster, the domUs would run without issues, as before.
* What exactly did you do (or not do) that was effective (or ineffective)?
After reverting to the 4.9 kernel and PV mode on the domUs, the issue did
not reoccur on the same (Buster)
upgraded machine. The issue did not occur again in those domUs, even those
configured with a swap file.
As an additional precaution some domUs were reconfigured without a swap
file, using a swap partition instead.
The configuration with drbd on lvm2 volumes was maintained, as it had been
in use without issue for a number of years
on this machine and similar machines.
-- Package-specific info:
** Version:
Linux version 4.19.0-5-amd64 (debian-ker...@lists.debian.org) (gcc version
8.3.0 (Debian 8.3.0-6)) #1 SMP Debian 4.19.37-5+deb10u1 (2019-07-19)
** Command line:
placeholder root=/dev/mapper/host-vg-root ro console=tty0
console=ttyS1,115200n8 quiet
** Not tainted
** Model information
sys_vendor: HP
product_name: ProLiant DL360 G7
product_version:
chassis_vendor: HP
chassis_version:
bios_vendor: HP
bios_version: P68
** PCI devices:
05:00.0 RAID bus controller [0104]: Hewlett-Packard Company Smart Array G6
controllers [103c:323a] (rev 01)
Subsystem: Hewlett-Packard Company Smart Array P410i [103c:3245]
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 28
Region 0: Memory at fbe00000 (64-bit, non-prefetchable) [size=2M]
Region 2: Memory at fbdf0000 (64-bit, non-prefetchable) [size=4K]
Region 4: I/O ports at 4000 [size=256]
[virtual] Expansion ROM at fbd00000 [disabled] [size=512K]
Capabilities: <access denied>
Kernel driver in use: hpsa
Kernel modules: hpsa
-- System Information:
Debian Release: 10.0
APT prefers stable-updates
APT policy: (500, 'stable-updates'), (500, 'stable')
Architecture: amd64 (x86_64)
Kernel: Linux 4.19.0-5-amd64 (SMP w/2 CPU cores)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8),
LANGUAGE=en_US:en (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled
Nick
