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--- proxmox:troubleshooting:kernel_panic [2021/07/24 16:50] – created peter
+++ proxmox:troubleshooting:kernel_panic [2021/07/24 17:08] (current) – [Possible Solution] peter
@@ Line 2: / Line 2: @@
 Proxmox freezing with Kernel Panic.
+This Kernel Panic seems to coincide with IO load.
 ----
-===== Solution =====
+===== Possible Solution =====
+Navigate to the specific VM causing the issue.
+  * Select the **Hardware** menu.
+  * Select the **Harddisk**.
+  * Changing cache from **No cache** to **Write back**
+  * Select **Memory** menu.
+  * Uncheck **Ballooning device**.
+<WRAP info>
+**NOTE:**  As the Kernel Panic seems to coincide with IO load, another option is to try disabling **io_uring**.
+  * With "cache=writeback" that is already the case, so it would seem to be a candidate of something that clearly changed in PVE 7.0.
-Seems linked to a specific VM.
+  * To test, edit the VM config in **/etc/pve/qemu-server/<vmid>.conf**:
+    * Add **,aio=native** to the end of your disks (i.e. scsi0, sata0, etc...).
+    * Verify by making sure **<nowiki>qm showcmd 100 --pretty | grep io_uring</nowiki>** does not show anything.
-Changing disks to use
+</WRAP>
 ----
-===== Install the latest amd64_microcode =====
+===== Solution - Install the latest amd64_microcode =====
-Edit /etc/apt/sources.list, and add in
+Edit **/etc/apt/sources.list**, and add in
 <file bash /etc/apt/sources.list>
 deb http://ftp.de.debian.org/debian bullseye main non-free
-</file?
+</file>
 Install the AMD Microcode:
@@ Line 32: / Line 50: @@
 ----
-====== References ======
+===== References =====
 https://packages.debian.org/bullseye/amd64-microcode