Cirrus: Workaround F32 BFQ Kernel bug
@@ -85,6 +85,16 @@ case "$CG_FS_TYPE" in
*) die_unknown CG_FS_TYPE
esac
+if ((CONTAINER==0)); then # Not yet running inside a container
+ # Discovered reemergence of BFQ scheduler bug in kernel 5.8.12-200
+ # which causes a kernel panic when system is under heavy I/O load.
+ # Previously discovered in F32beta and confirmed fixed. It's been
+ # observed in F31 kernels as well. Deploy workaround for all VMs
+ # to ensure a more stable I/O scheduler (elevator).
+ echo "mq-deadline" > /sys/block/sda/queue/scheduler
+ warn "I/O scheduler: $(cat /sys/block/sda/queue/scheduler)"
+fi
+
# Which distribution are we testing on.
case "$OS_RELEASE_ID" in
ubuntu*) ;;
