Public bug reported:
We might have a memleak in snapd 2.38+ on install - this could be
related to the move from go-1.6 to go-1.10. This was reported by a
customer. The data points we have so far:
- happens on refresh for the customer
- on systems with low amounts of memory (256M) this can lead to install/revert
failures because e.g. unsquashfs will fail to extract the snap.yaml
- the customer is using a plugin that talks to the socket regularly, maybe we
leak there
I did some initial testing that refreshes/installs a bunch of times (20
in this test) to see how that affects the memory. Once for 2.37.4 once
for 2.38-git.
The data:
$ snap version
snap 2.37.4+18.04.1
snapd 2.37.4+18.04.1
series 16
ubuntu 18.04
kernel 4.15.0-46-generic
$ sudo systemctl restart snapd ; sudo snap install --dangerous
/tmp/hello_20.snap; ps -C snapd -ocmd,rsz,vsz; for i in $(seq 20); do sudo
snap install --dangerous /tmp/hello_20.snap ; done ; ps -C snapd -ocmd,rsz,vsz
hello 2.10 installed
CMD RSZ VSZ
/usr/lib/snapd/snapd 31580 1221524
hello 2.10 installed
...
hello 2.10 installed
CMD RSZ VSZ
/usr/lib/snapd/snapd 33952 1297088
and then with:
$ snap version
snap 2.38+git1216.13ed1b8~ubuntu16.04.1
snapd 2.38+git1216.13ed1b8~ubuntu16.04.1
series 16
ubuntu 18.04
kernel 4.15.0-46-generic
$ sudo systemctl restart snapd ; sudo snap install --dangerous
/tmp/hello_20.snap; ps -C snapd -ocmd,rsz,vsz; for i in $(seq 20); do sudo
snap install --dangerous /tmp/hello_20.snap ; done ; ps -C snapd -ocmd,rsz,vsz
hello 2.10 installed
CMD RSZ VSZ
/usr/lib/snapd/snapd 35832 1226080
hello 2.10 installed
...
hello 2.10 installed
CMD RSZ VSZ
/usr/lib/snapd/snapd 36760 1300068
So this looks like the RSZ size of snapd itself is bigger but it seems
like we indeed grow.
** Affects: snapd (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1822738
Title:
memleak in 2.38+ ?
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