I experienced a similar problem, with constant disk writing at low rate
(few hundred KB/s) and after inspecting the snapd process running on a
container we found the following:
root@focal:/# snap changes
ID Status Spawn Ready Summary
234 Doing 2 days ago, at 16:40 UTC - Auto-refresh snap "snapd"
root@focal:/# snap change 234
Status Spawn Ready Summary
Done 2 days ago, at 16:40 UTC 2 days ago, at 16:40 UTC Ensure
prerequisites for "snapd" are available
Doing 2 days ago, at 16:40 UTC - Download snap
"snapd" (8008) from channel "latest/edge" (8.71%)
Do 2 days ago, at 16:40 UTC - Fetch and check
assertions for snap "snapd" (8008)
Do 2 days ago, at 16:40 UTC - Mount snap "snapd"
(8008)
Do 2 days ago, at 16:40 UTC - Run pre-refresh
hook of "snapd" snap if present
Do 2 days ago, at 16:40 UTC - Stop snap "snapd"
services
Do 2 days ago, at 16:40 UTC - Remove aliases for
snap "snapd"
Do 2 days ago, at 16:40 UTC - Make current
revision for snap "snapd" unavailable
Do 2 days ago, at 16:40 UTC - Copy snap "snapd"
data
Do 2 days ago, at 16:40 UTC - Setup snap "snapd"
(8008) security profiles
Do 2 days ago, at 16:40 UTC - Make snap "snapd"
(8008) available to the system
Do 2 days ago, at 16:40 UTC - Automatically
connect eligible plugs and slots of snap "snapd"
Do 2 days ago, at 16:40 UTC - Set automatic
aliases for snap "snapd"
Do 2 days ago, at 16:40 UTC - Setup snap "snapd"
aliases
Do 2 days ago, at 16:40 UTC - Run post-refresh
hook of "snapd" snap if present
Do 2 days ago, at 16:40 UTC - Start snap "snapd"
(8008) services
Do 2 days ago, at 16:40 UTC - Remove data for
snap "snapd" (7988)
Do 2 days ago, at 16:40 UTC - Remove snap "snapd"
(7988) from the system
Do 2 days ago, at 16:40 UTC - Clean up "snapd"
(8008) install
Do 2 days ago, at 16:40 UTC - Run health check of
"snapd" snap
Doing 2 days ago, at 16:40 UTC - Consider re-refresh
of "snapd"
The download is stalled at 8.71%. It's worth noting that I experienced
connectivity issues two days ago and snap downloads were affected and
they were very slow for a couple of hours before getting back to normal.
** Changed in: snapd (Ubuntu)
Status: Expired => Confirmed
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https://bugs.launchpad.net/bugs/1831629
Title:
snapd hammers SSD for long periods
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