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-rwxr-xr-xcontrib/cirrus/setup_environment.sh10
1 files changed, 10 insertions, 0 deletions
diff --git a/contrib/cirrus/setup_environment.sh b/contrib/cirrus/setup_environment.sh
index a3840d7e6..8ccbd95d9 100755
--- a/contrib/cirrus/setup_environment.sh
+++ b/contrib/cirrus/setup_environment.sh
@@ -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*) ;;