My file server is usually very stable. The past week I had two mdadm arrays that required recync operations. * newly created raid6 array (14 x 16TB seagate exos) * existing raid 6 array, after a reboot resync on hot spare (14 x 4TB seagate barracuda) During both resync operations (they ran one at a time) the system would routinely experience a major error and require a hard reboot, every two or three hours. I saw several errors, such as: * kernel watchdog soft lockups [md127_raid6:364] * general protection faults (I have a few saved with the full exception stack) * exceptions in iommu routines (again I have the full error with exception stack saved) * full system lockup I doubt there is a bug in mdadm that caused this behavior. But it was very predictable and repeatable while the resync operations were in progress. How can I avoid these errors the next time I have an array in need of a resync? OS: debian 11 bullseye kernel: 5.10.0-8-amd64 #1 SMP Debian 5.10.46-4 (2021-08-03) mdadm: v4.1 - 2018-10-01 sata HBA: 3 x LSI SAS 9201-16i _____________ Ryan Patterson May the wings of liberty never lose a feather.
