Kernel OOPs triggered by big writes to ext4 FS

[ajtravis]

I've managed to avoid mounting filesystems in "sync" mode to stop Oops happening during heavy i/o by setting the Linux kernel "overcommit_memory" mode to never overcommit:

Code:

echo 2 > /proc/sys/vm/overcommit_memory

Also, to do it on boot:

Code:

echo "vm.overcommit_memory=2" >> /etc/sysctl.conf

I now have OMV6 working under Armbian 21.08.1 Bullseye with Linux 5.15.25-rockchip64 with u-boot in SPI, root on eMMC and dual 1TB SATA disks on an Adaptec AAR-1220SA controller. It's been a bit of an uphill struggle to get a working system. Most of the images I've tried have failed in the same way on ext4, Btrfs or ZFS - I think the overcommit occurs in the filesystem-independant kernel VFS. The system was quite stable under FreeBSD with root on eMMC, but my Adaptec controller is not supported so I couldn't test it. I want to run OMV6 under Armbian Bullseye, but tested my Rockpro64 under FreeBSD to see if the problem only occurs under Linux. What I find very puzzling is that I've not had the same Oops under heavy i/o on my Pinebook Pro, which is very similar hardware to the Rockpro64.