Qbittorent is eating all memory thrown at it. This looks like a memory leak and can't be right

[samuellazea]

qBittorrent & operating system versions

qBittorrent was built with the following libraries:
Qt: | 6.7.2
Libtorrent: | 2.0.10.0
Boost: | 1.84.0
OpenSSL: | 3.3.2
zlib: | 1.3.1

What is the problem?

I have it as a docker container and what used to be able to work with 1G of memory now I throw even 15G of memory at it and it eats all of the memory and then webui is not reachable anymore and looks like the process is restarting somehow.
I tried to limit the amount of downloads to 10 and tried multiple settings but without any luck. All that I tried it kept on eating it all

Steps to reproduce

1. Start the container
2. 1 min later all memory is consumed

Additional context

Log(s) & preferences file(s)

cat qbittorrent_seriale/data/qBittorrent/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\AlternativeGlobalDLSpeedLimit=0
Session\AlternativeGlobalUPSpeedLimit=0
Session\DefaultSavePath=/tv
Session\ExcludedFileNames=
Session\GlobalMaxSeedingMinutes=14500
Session\IgnoreLimitsOnLAN=true
Session\MaxActiveDownloads=10
Session\MaxActiveTorrents=15
Session\MaxActiveUploads=15
Session\MaxConnections=500
Session\MaxConnectionsPerTorrent=100
Session\MaxUploads=8
Session\MaxUploadsPerTorrent=4
Session\PerformanceWarning=true
Session\Port=32701
Session\QueueingSystemEnabled=true
Session\SSL\Port=20590
Session\ShareLimitAction=Stop
Session\TempPath=/seeding/incomplete
Session\TempPathEnabled=true
Session\uTPRateLimited=false

[Core]
AutoDeleteAddedTorrentFile=Never

[LegalNotice]
Accepted=true

[Meta]
MigrationVersion=8

[Network]
PortForwardingEnabled=false
Proxy\HostnameLookupEnabled=false
Proxy\Profiles\BitTorrent=true
Proxy\Profiles\Misc=true
Proxy\Profiles\RSS=true

[Preferences]
Advanced\RecheckOnCompletion=false
Advanced\trackerPort=9000
Connection\PortRangeMin=6881
Connection\ResolvePeerCountries=true
Connection\UPnP=false
Downloads\SavePath=/downloads/
Downloads\TempPath=/downloads/incomplete/
DynDNS\DomainName=changeme.dyndns.org
DynDNS\Enabled=false
DynDNS\Password=
DynDNS\Service=DynDNS
DynDNS\Username=
General\Locale=en
MailNotification\email=
MailNotification\enabled=false
MailNotification\password=
MailNotification\req_auth=true
MailNotification\req_ssl=false
MailNotification\[email protected]
MailNotification\smtp_server=smtp.changeme.com
MailNotification\username=
WebUI\Address=*
WebUI\AlternativeUIEnabled=false
WebUI\AuthSubnetWhitelist=192.168.200.0/24
WebUI\AuthSubnetWhitelistEnabled=true
WebUI\BanDuration=3600
WebUI\CSRFProtection=false
WebUI\ClickjackingProtection=false
WebUI\CustomHTTPHeaders=
WebUI\CustomHTTPHeadersEnabled=false
WebUI\HTTPS\CertificatePath=
WebUI\HTTPS\Enabled=false
WebUI\HTTPS\KeyPath=
WebUI\HostHeaderValidation=false
WebUI\LocalHostAuth=false
WebUI\MaxAuthenticationFailCount=5
WebUI\Password_PBKDF2="xxxxxx"
WebUI\Port=8086
WebUI\ReverseProxySupportEnabled=false
WebUI\RootFolder=
WebUI\SecureCookie=true
WebUI\ServerDomains=*
WebUI\SessionTimeout=3600
WebUI\TrustedReverseProxiesList=
WebUI\UseUPnP=true
WebUI\Username=something

[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})"
`

`cat qbittorrent_seriale/data/qBittorrent/watched_folders.json 
{
}
`

[ArcticGems]

Since you are using Libtorrent 2.0.X, have you tried the advanced option 'Simple pread/pwrite'?

[samuellazea]

Thanks for the mention. I didn't know about it before but I did try it now. And it's still the same. And yes, I restarted the container :) . It's eating 7G and then crashing and repeat

[muradbu]

I just suspected a memory leak as well then came here to see I'm not the only one. I'm running a qbittorrent-nox 5.0.1 instance on Linux with the default 512 MiB physical memory usage limit, only to see memory usage ramp up to above 40 GB.

[HanabishiRecca]

Duplicate of #21502.

[Pentaphon]

Libtorrent: | 2.0.10.0

@samuellazea Stop using these builds. Use the 1.2.19 builds.

[mustafa-kapadia1483]

@samuellazea hide the torrent names for obvious reasons. Could land you in trouble

[samuellazea]

@samuellazea hide the torrent names for obvious reasons. Could land you in trouble

You do have a really good point. Thank you lots :)

[nerdguy1338]

i had this problem too, qbittorrent eats ram slowly, over a day or so. upgraded to v 5.0.2 app image from v4.7 deb on ubuntu 24, no more ram gobbling!