63996: Acronis Cyber Protect Cloud, Acronis Cyber Backup: backup fails with 'Common I/O error'

Symptoms

A Linux machine backup fails with this error message:

Message: Failed to create volume snapshot.
------------------------
Error code: 5832705
Fields: {"$module":"disk_bundle_lxa64_15300","device":"/dev/md1"}
Message: Common I/O error.

You see these errors in /var/log/messages/
Jan  6 23:22:11 kernel: heartbeat_timer_func(swapper/0,0): Deadlock detected.dev=900001, cnt=6, state=4. Unfreezing...
Jan  6 23:22:11 kernel: find_deadlocked(snapapid,7404): dev=900001 state=1024
Jan  6 23:22:12 kernel: do_resolver(snapapid,7404): Real cleanup started... s=ffff9b7209fbc000(900001)
Jan  6 23:22:12 kernel: find_deadlocked(snapapid,7404): dev=900001 state=256
Jan  6 23:22:12 kernel: find_deadlocked(snapapid,7404): dev=900002 state=2

Cause

Root causes may vary. One of the reasons could be insufficient hardware resources to process the multi-volume snapshot. Taking snapshots of multiple volumes at the same time rather than one by one requires more resources.

Solution

Disable Multi-volume snapshots in backup plan settings and re-run backup.

More information

If the issue persist, please create a system report Acronis Cyber Protect Cloud: Collecting System Report of the affected machine and contact Acronis Support.