@anthoineb,
We checked both SMlog and xensource.log for the two latest incidents on hypervisor 172.30.50.181.
There was no VM or storage pause/unpause operation before either stall. The only matching pause/unpause pairs were part of our later forced VM.hard_reboot:
2026-08-19, VM 172.30.52.185: stall confirmed around 20:24; pause at 20:36:37 and unpause at 20:38:12.
2026-08-20, VM 172.30.52.182: stall confirmed around 20:24; pause at 20:30:07 and unpause at 20:31:26.
The first related VDI operations in SMlog were also the vdi_deactivate actions initiated by those reboots. Therefore, we do not see a pause/unpause immediately before or at the onset of either lock.