The unexpected exit of `jsonfile.Encode` is blocking the container's stdout and stderr.

[zwtop]

Description

Any file write error will cause jsonfile.Encode to exit, stopping the copying of container logs. When buffer is full, container log writes will then block and hang.

Due to a full file system in our environment, a container hung on write logs. Despite our prompt cleanup, the issue persisted and was resolved by restarting the container finally.

relate containerd/containerd#12462

Container use json-file log driver have this issue.

nerdctl/pkg/logging/jsonfile/jsonfile.go

Lines 62 to 65 in 3c376a8

	if encErr != nil {
	log.L.WithError(encErr).Errorf("failed to encode JSON")
	return
	}

Steps to reproduce the issue

1. nerdctl run -d --name logging-test docker.io/library/busybox:latest ping 127.0.0.1 -i 0.1 -c 3000
2. chattr +i $(nerdctl inspect logging-test -f {{.LogPath}}); sleep 1; chattr -i $(nerdctl inspect logging-test -f {{.LogPath}})
3. The ping commands hangs forever.

Describe the results you received and expected

Received: container hang
Expected: container not hang

What version of nerdctl are you using?

Client:
 Version:       1.7.7
 OS/Arch:       linux/amd64
 Git commit:    23d838b457213765095992ddd2c1b26a0c402632.m
 buildctl:
  Version:

Server:
 containerd:
  Version:      1.6.32
  GitCommit:    8b3b7ca2e5ce38e8f31a34f35b2b68ceb8470d89
 runc:
  Version:      1.1.12
  GitCommit:    v1.1.12-0-g51d5e94

Are you using a variant of nerdctl? (e.g., Rancher Desktop)

None

Host information

Client:
 Namespace:     default
 Debug Mode:    false

Server:
 Server Version: 1.6.32
 Storage Driver: overlayfs
 Logging Driver: json-file
 Cgroup Driver: cgroupfs
 Cgroup Version: 1
 Plugins:
  Log: fluentd journald json-file syslog
  Storage: native overlayfs
 Security Options:
  seccomp
   Profile: builtin
 Kernel Version: 4.18.0-513.24.1.el8_9.v1.x86_64
 Operating System: Rocky Linux 8.9 (Green Obsidian)
 OSType: linux
 Architecture: x86_64
 CPUs: 2
 Total Memory: 1.718GiB
 Name: osbuild
 ID: ef318042-eff5-4f1c-9609-b726bd1e0a19

WARNING: IPv4 forwarding is disabled
WARNING: bridge-nf-call-iptables is disabled
WARNING: bridge-nf-call-ip6tables is disabled

[AkihiroSuda]

Version: 1.7.7

Seems quite old version.
Does it work with the latest version (2.2.0) ?

[zwtop]

Version: 1.7.7

Seems quite old version. Does it work with the latest version (2.2.0) ?

It don't works.