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Your message dated Wed, 05 Nov 2025 21:32:17 +0000
with message-id
and subject line Bug#1116358: fixed in linux 6.12.57-1
has caused the Debian Bug report #1116358,
regarding linux-image-6.12.48+deb13-amd64: LVM snapshots causing I/O errors in
KVM guest with aio=io_uring set
to be marked as done.
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1116358: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1116358
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Message-ID:
Subject: linux-image-6.12.48+deb13-amd64: LVM snapshots causing I/O errors
in KVM guest with aio=io_uring set
From: Kevin Lumik
To: submit@bugs.debian.org
Organization: XF Systems =?ISO-8859-1?Q?O=DC?=
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Date: Fri, 26 Sep 2025 10:34:22 +0300
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Delivered-To: submit@bugs.debian.org
Package: src:linux
Version: 6.12.48-1
Severity: normal
Dear Maintainer,
After upgrading from Debian Bookworm to Trixie, an issue within KVM guests
when creating an LVM snapshot of its volume
has surfaced. When a LVM snapshot is taken from the host, the guest starts to
get I/O errors. The issue seems to only
appear when aio=io_uring is specified in the KVM drive parameters and also
seems to resolve when downgrading the kernel
package down to 6.1. The issue is also not reproducible when using aio=native.
KVM args for the drive: "-drive id=drive-
virtio0,format=raw,file=/dev/dom/vps_testsql,cache=none,aio=io_u
ing,index=0,media=disk,if=virtio"
An IO workload is being created in the VM using "fio --randrepeat=1
--ioengine=io_uring --direct=1 --gtod_reduce=1 --
name=randwrite --filename=/root/test.bin --bs=4k --iodepth=64 --runtime=60
--numjobs=32 --readwrite=randwrite --size=1G
--rwmixread=75 --group_reporting"
After running "lvcreate -s /dev/dom/vps_testsql -n test -L 1G" on the host we
can observe fio erroring out:
...
fio: io_u error on file /root/test.bin: Input/output error: write
offset=46977024, buflen=4096
fio: pid=7367, err=5/file:io_u.c:1876, func=io_u error, error=Input/output
error
fio: io_u error on file /root/test.bin: Input/output error: write
offset=261505024, buflen=4096
fio: pid=7374, err=5/file:io_u.c:1876, func=io_u error, error=Input/output
error
fio: io_u error on file /root/test.bin: Input/output error: write
offset=973840384, buflen=4096
fio: io_u error on file /root/test.bin: Input/output error: write
offset=9637888, buflen=4096
fio: io_u error on file /root/test.bin: Input/output error: write
offset=159965184, buflen=4096
fio: io_u error on file /root/test.bin: Input/output error: write
offset=857505792, buflen=4096
fio: io_u error on file /root/test.bin: Input/output error: write
offset=90787840, buflen=4096
fio: io_u error on file /root/test.bin: Input/output error: write
offset=26427392, buflen=4096
fio: io_u error on file /root/test.bin: Input/output error: write
offset=955621376, buflen=4096
fio: io_u error on file /root/test.bin: Input/output error: write
offset=96169984, buflen=4096
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