[BUG] Container restarting, Catching signal: SIGTERM

[M0ssTee]

Is there an existing issue for this?

• I have searched the existing issues

Current Behavior

What is the problem?

After an unknown amount of time, the Docker container from Linuxserver.io will crash/exit with the following logs from docker logs qbittorrent:

───────────────────────────────────────
Linuxserver.io version: 5.1.2-r3-ls420
Build-date: 2025-10-12T06:54:18+00:00
───────────────────────────────────────

[custom-init] No custom files found, skipping...
WebUI will be started shortly after internal preparations. Please wait...

******** Information ********
To control qBittorrent, access the WebUI at: http://localhost:8081
Connection to localhost (::1) 8081 port [tcp/tproxy] succeeded!
[ls.io-init] done.
Catching signal: SIGTERM
Exiting cleanly

Additional context

This is similar to issues 19817, 23023, and 22956 in the qbittorrent/qBittorrent repo. I originally posted the issue there as 23383 and was redirected here.

Log(s) & preferences file(s)

qBittorrent.conf

[Application]
FileLogger\Age=1
FileLogger\AgeType=1
FileLogger\Backup=true
FileLogger\DeleteOld=true
FileLogger\Enabled=true
FileLogger\MaxSizeBytes=66560
FileLogger\Path=/config/qBittorrent/logs

[AutoRun]
enabled=false
program=

[BitTorrent]
Session\AddTorrentStopped=false
Session\DefaultSavePath=/downloads/downloads
Session\ExcludedFileNames=
Session\Port=6881
Session\QueueingSystemEnabled=false
Session\SSL\Port=52062
Session\ShareLimitAction=Stop
Session\TempPath=/downloads/incomplete/
Session\TorrentExportDirectory=/downloads/torrents
Session\UseAlternativeGlobalSpeedLimit=true

[Core]
AutoDeleteAddedTorrentFile=Never

[LegalNotice]
Accepted=true

[Meta]
MigrationVersion=8

[Network]
Cookies=@Invalid()
PortForwardingEnabled=false
Proxy\HostnameLookupEnabled=false
Proxy\Profiles\BitTorrent=true
Proxy\Profiles\Misc=true
Proxy\Profiles\RSS=true

[Preferences]
Connection\PortRangeMin=6881
Connection\UPnP=false
Downloads\SavePath=/downloads/
Downloads\TempPath=/downloads/incomplete/
General\Locale=en
MailNotification\req_auth=true
WebUI\Address=*
WebUI\Password_PBKDF2="@ByteArray(MnapLIRF0Jh+h/ymR8IL2g==:VUnP/M5d2uVe2GIs9lyBKQE/xuRwIxjHXC4rNMQjyuN4hZ+iA8xwflTNs57Zbs2cX4TgnSSOF9HJuizKWiMhIA==)"
WebUI\Port=8081
WebUI\ServerDomains=*

[RSS]
AutoDownloader\DownloadRepacks=true
AutoDownloader\SmartEpisodeFilter=s(\\d+)e(\\d+), (\\d+)x(\\d+), "(\\d{4}[.\\-]\\d{1,2}[.\\-]\\d{1,2})", "(\\d{1,2}[.\\-]\\d{1,2}[.\\-]\\d{4})"

Steps To Reproduce

Start the container with docker compose up -d.
Wait.
Attempt to access via webui
Check logs

Environment

qBittorrent: 5.1.2
Operating system: Ubuntu 24.04.3 LTS VM on top of Proxmox pve-manager/8.4.1
Qt: 6.9.3
libtorrent: 2.0.111.0
How docker service was installed: I do not recall

CPU architecture

x86-64

Docker creation

services:
        qbittorrent:
               container_name: qbittorrent
               restart: unless-stopped
               ports:
                       - 6881:6881
                       - 6881:6881/udp
                       - 8081:8081
                       - 8118:8118
               volumes:
                       - /home/mosstee/config/qbittorrent:/config
                       - /home/mosstee/mnt/media/torrents:/downloads
               environment:
                       - WEBUI_PORT=8081
                       - TORRENTING_PORT=6881
                       - TZ=Etc/UTC
                       - PUID=1000
                       - PGID=1000
               image: lscr.io/linuxserver/qbittorrent:latest

Container logs

qbittorrent.log


(N) 2025-10-14T20:00:03 - qBittorrent termination initiated
(N) 2025-10-14T20:00:04 - Saving resume data completed.
(N) 2025-10-14T20:00:05 - BitTorrent session successfully finished.
(N) 2025-10-14T20:00:05 - qBittorrent is now ready to exit
(N) 2025-10-14T22:04:09 - qBittorrent v5.1.2 started. Process ID: 147
(N) 2025-10-14T22:04:09 - Using config directory: /config/qBittorrent
(N) 2025-10-14T22:04:09 - Trying to listen on the following list of IP addresses: "0.0.0.0:6881,[::]:6881"
(I) 2025-10-14T22:04:10 - Peer ID: "-qB5120-"
(I) 2025-10-14T22:04:10 - HTTP User-Agent: "qBittorrent/5.1.2"
(I) 2025-10-14T22:04:10 - Distributed Hash Table (DHT) support: ON
(I) 2025-10-14T22:04:10 - Local Peer Discovery support: ON
(I) 2025-10-14T22:04:10 - Peer Exchange (PeX) support: ON
(I) 2025-10-14T22:04:10 - Anonymous mode: OFF
(I) 2025-10-14T22:04:10 - Encryption support: ON
(I) 2025-10-14T22:04:10 - Successfully listening on IP. IP: "127.0.0.1". Port: "TCP/6881"
(I) 2025-10-14T22:04:10 - Successfully listening on IP. IP: "127.0.0.1". Port: "UTP/6881"
(I) 2025-10-14T22:04:10 - Successfully listening on IP. IP: "172.18.0.4". Port: "TCP/6881"
(I) 2025-10-14T22:04:10 - Successfully listening on IP. IP: "172.18.0.4". Port: "UTP/6881"
(I) 2025-10-14T22:04:10 - Successfully listening on IP. IP: "::1". Port: "TCP/6881"
(I) 2025-10-14T22:04:10 - Successfully listening on IP. IP: "::1". Port: "UTP/6881"


docker logs qbittorrent


───────────────────────────────────────

      ██╗     ███████╗██╗ ██████╗
      ██║     ██╔════╝██║██╔═══██╗
      ██║     ███████╗██║██║   ██║
      ██║     ╚════██║██║██║   ██║
      ███████╗███████║██║╚██████╔╝
      ╚══════╝╚══════╝╚═╝ ╚═════╝

   Brought to you by linuxserver.io
───────────────────────────────────────

To support LSIO projects visit:
https://www.linuxserver.io/donate/

───────────────────────────────────────
GID/UID
───────────────────────────────────────

User UID:    1000
User GID:    1000
───────────────────────────────────────
Linuxserver.io version: 5.1.2-r3-ls420
Build-date: 2025-10-12T06:54:18+00:00
───────────────────────────────────────

[custom-init] No custom files found, skipping...
WebUI will be started shortly after internal preparations. Please wait...

******** Information ********
To control qBittorrent, access the WebUI at: http://localhost:8081
Connection to localhost (::1) 8081 port [tcp/tproxy] succeeded!
[ls.io-init] done.
Catching signal: SIGTERM
Exiting cleanly
[migrations] started
[migrations] no migrations found
usermod: no changes
───────────────────────────────────────

      ██╗     ███████╗██╗ ██████╗
      ██║     ██╔════╝██║██╔═══██╗
      ██║     ███████╗██║██║   ██║
      ██║     ╚════██║██║██║   ██║
      ███████╗███████║██║╚██████╔╝
      ╚══════╝╚══════╝╚═╝ ╚═════╝

   Brought to you by linuxserver.io
───────────────────────────────────────

To support LSIO projects visit:
https://www.linuxserver.io/donate/

───────────────────────────────────────
GID/UID
───────────────────────────────────────

User UID:    1000
User GID:    1000
───────────────────────────────────────
Linuxserver.io version: 5.1.2-r3-ls420
Build-date: 2025-10-12T06:54:18+00:00
───────────────────────────────────────

[custom-init] No custom files found, skipping...
WebUI will be started shortly after internal preparations. Please wait...

******** Information ********
To control qBittorrent, access the WebUI at: http://localhost:8081
Connection to localhost (::1) 8081 port [tcp/tproxy] succeeded!
[ls.io-init] done.
Catching signal: SIGTERM
Exiting cleanly
[migrations] started
[migrations] no migrations found
usermod: no changes
───────────────────────────────────────

      ██╗     ███████╗██╗ ██████╗
      ██║     ██╔════╝██║██╔═══██╗
      ██║     ███████╗██║██║   ██║
      ██║     ╚════██║██║██║   ██║
      ███████╗███████║██║╚██████╔╝
      ╚══════╝╚══════╝╚═╝ ╚═════╝

   Brought to you by linuxserver.io
───────────────────────────────────────

To support LSIO projects visit:
https://www.linuxserver.io/donate/

───────────────────────────────────────
GID/UID
───────────────────────────────────────

User UID:    1000
User GID:    1000
───────────────────────────────────────
Linuxserver.io version: 5.1.2-r3-ls420
Build-date: 2025-10-12T06:54:18+00:00
───────────────────────────────────────

[custom-init] No custom files found, skipping...
WebUI will be started shortly after internal preparations. Please wait...

******** Information ********
To control qBittorrent, access the WebUI at: http://localhost:8081
Connection to localhost (::1) 8081 port [tcp/tproxy] succeeded!
[ls.io-init] done.
Catching signal: SIGTERM
Exiting cleanly
[migrations] started
[migrations] no migrations found
usermod: no changes
───────────────────────────────────────

      ██╗     ███████╗██╗ ██████╗
      ██║     ██╔════╝██║██╔═══██╗
      ██║     ███████╗██║██║   ██║
      ██║     ╚════██║██║██║   ██║
      ███████╗███████║██║╚██████╔╝
      ╚══════╝╚══════╝╚═╝ ╚═════╝

   Brought to you by linuxserver.io
───────────────────────────────────────

To support LSIO projects visit:
https://www.linuxserver.io/donate/

───────────────────────────────────────
GID/UID
───────────────────────────────────────

User UID:    1000
User GID:    1000
───────────────────────────────────────
Linuxserver.io version: 5.1.2-r3-ls420
Build-date: 2025-10-12T06:54:18+00:00
───────────────────────────────────────

[custom-init] No custom files found, skipping...
WebUI will be started shortly after internal preparations. Please wait...

******** Information ********
To control qBittorrent, access the WebUI at: http://localhost:8081
Connection to localhost (::1) 8081 port [tcp/tproxy] succeeded!
[ls.io-init] done.
Catching signal: SIGTERM
Exiting cleanly

[github-actions]

Thanks for opening your first issue here! Be sure to follow the relevant issue templates, or risk having this issue marked as invalid.

[aptalca]

It's not crashing. Something is sending it a sigterm, possibly a docker stop or docker restart command. It's not the container, it's your environment. Maybe you have an external healthcheck that fails and tries to restart it.

[d8bauxit8]

I have the similar issue from today, after upgrade the latest version of this image. :(
I have downgrade to 4.6.7 and the issue is gone.

[zt64]

I'm having the same exact issue in my container as well with nothing useful in the logs. And it's been going on for weeks, I didn't realize until finding this issue others were having it too. It's really annoying

[M0ssTee]

Switching to version 4.6.7 didn't fix it for me, so I tried changing to the qbittorrent/docker-qbittorrent-nox docker container. It's only been a few hours, but no issues so far.

[d8bauxit8]

I started investigating, and I found the issue on my end.
A couple of hours, after I started to download a new item, the 4.x versions did not solve the problem for me too.

My main problem

When I gave high bandwidth to a download, the client restarted every 30–45 seconds. (Only the qbittorrent process restarted, not the container.)

Here are the steps I went through:

Unfortunately, I didn’t see anything unusual in the qbittorrent log, only that the process kept restarting.

...
WebUI will be started shortly after internal preparations. Please wait...

******** Information ********
To control qBittorrent, access the WebUI at: http://localhost:8080
Connection to localhost (::1) 8080 port [tcp/http-alt] succeeded!
WebUI will be started shortly after internal preparations. Please wait...

******** Information ********
To control qBittorrent, access the WebUI at: http://localhost:8080
Connection to localhost (::1) 8080 port [tcp/http-alt] succeeded!
...

Just to be sure, I checked if anything was happening with the container status, but nothing there either.

alpine:~$ docker inspect qbittorrent | grep -A4 Health
            "Health": {
                "Status": "healthy",
                "FailingStreak": 0,
                "Log": [
                    {
--
            "Healthcheck": {
                "Test": [
                    "CMD-SHELL",
                    "wget -q --tries=1 --spider http://localhost:8080 || exit 1"
                ],

Let’s take a step back: what triggers the restart?
In Linuxserver.io images, the s6 overlay is responsible for starting processes inside a container.
There’s also a restart script that monitors the process state and restarts it if it stops.

So now we know why it restarts.
However, what was strange is that there was no log about why it stopped.
That’s when I started thinking: if I killed the qbittorrent process externally, I wouldn’t see any error logs either, but the container would keep running and s6 overlay would restart the client.

From there, it was clear: let’s check the killed processes on Linux, which immediately revealed the cause of the problem.

alpine:~$ dmesg | grep -i 'killed process'
[246190.009624] Memory cgroup out of memory: Killed process 3194 (qbittorrent-nox) total-vm:9394776kB, anon-rss:12708kB, file-rss:2226380kB, shmem-rss:0kB, UID:1000 pgtables:5384kB oom_score_adj:0

In my compose file, qbittorrent had a 4 GB memory limit, which turned out to be insufficient during fast downloads. After doubling it, the problem disappeared.

    mem_limit: 8g
    mem_reservation: 128m
    memswap_limit: 16g

Additionally, increase the value in qbittorrent’s settings as well.
Make sure to enter the value in MiB, not MB.