id = 1888
title = "megasas: Buffer I/O error on dev sda / critical target error, dev sda, sector 0 op 0x0:(READ)"
state = "opened"
created_at = "2023-09-14T05:09:17.340Z"
closed_at = "n/a"
labels = ["Storage"]
url = "https://gitlab.com/qemu-project/qemu/-/issues/1888"
host-os = "ALT Linux"
host-arch = "x86-64"
qemu-version = "7.2.0 - 8.0.0"
guest-os = "ALT Linux"
guest-arch = "x86_64"
description = """Since QEMU 7.2.0 when using `megasas` device the guest kernel is unable to I/O with the device (Input/output error) also producing errors messages in `dmesg` like these:
```
[   18.739344] critical target error, dev sda, sector 0 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 2
[   18.739925] Buffer I/O error on dev sda, logical block 0, async page read
[   18.740374] Dev sda: unable to read RDB block 0
```

Relevant options are: `-device megasas -blockdev driver=null-co,read-zeroes=on,node-name=null -device scsi-hd,drive=null` then in guest `modprobe megaraid-sas`. With qcow2 images - errors are the same.

I also tested that the same commands produce no errors on QEMU 6.0.0 - 7.1.0."""
reproduce = "n/a"
additional = "n/a"