------- Comment From hariharan.ts@ibm.com 2026-04-13 08:22 EDT------- mpellizzer Any updates here ------- Comment From sthoufee@in.ibm.com 2026-04-14 00:43 EDT------- let us know if this is going to fixed it soon. if not we will need to document it is known issue for current user's for this release. ------- Comment From hariharan.ts@ibm.com 2026-04-15 04:27 EDT------- Documentation bug raised. Bug 218567 - [Documentation] [Ubuntu 26.04] Running iperf3 client for longer duration causes OOM on guest ------- Comment From Aniket.Sahu1@ibm.com 2026-04-23 06:51 EDT------- Hi, I'll try reproducing this issue with the latest kernel available on the apt repos and update the bugzilla page ASAP. -- You received this bug notification because you are subscribed to linux in Ubuntu. Matching subscriptions: Bgg, Bmail, Nb https://bugs.launchpad.net/bugs/2143080 Title: [Ubuntu 26.04] Running iperf3 client for longer duration causes OOM on guest Status in The Ubuntu-power-systems project: New Status in linux package in Ubuntu: New Status in linux source package in Resolute: New Bug description: Problem Description: Brought up Ubuntu 26.04 guest with a single bridge interface, ran iperf3 in server mode on the host and started iperf3 client on the guest, connecting to the server on the host via the bridge IP, with 8000 sec test time on client. At some point in the first hour or two, OOM is observed on the guest, with sudden memory usage spike. Guest bridge xml snippet: <interface type='bridge'> <mac address='52:54:00:08:0d:f8'/> <source bridge='virbr0'/> <model type='rtl8139'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x0'/> </interface> System Information: Linux ltcden6-lp4 6.18.0-8-generic #8-Ubuntu SMP PREEMPT_DYNAMIC Wed Dec 17 15:52:06 UTC 2025 ppc64le GNU/Linux PRETTY_NAME="Ubuntu Resolute Raccoon (development branch)" NAME="Ubuntu" VERSION_ID="26.04" VERSION="26.04 (Resolute Raccoon)" VERSION_CODENAME=resolute ID=ubuntu ID_LIKE=debian HOME_URL="https://www.ubuntu.com/" SUPPORT_URL="https://help.ubuntu.com/" BUG_REPORT_URL="https://bugs.launchpad.net/ubuntu/" PRIVACY_POLICY_URL="https://www.ubuntu.com/legal/terms-and-policies/privacy-policy" UBUNTU_CODENAME=resolute LOGO=ubuntu-logo Steps to reproduce: 1. Start guest domain console with virsh start <domain name> --console 2. On a separate tab, start the iperf3 server on the host machine with the following command to use port 6969 (any port that is available is okay to use) iperf3 -s -p 6969 3. Check the ip of virbr0 (or the bridge network in use by the guest) ip addr keep a note of the ip of virbr0 (or the bridge network in use), lets assume 192.168.122.1 at the moment 4. In the guest console tab, run the iperf3 client in background, attach the server IP as the IP address of the bridge noted above, with the port you started the iperf3 server at, specify the time as 8000 seconds, and monitor dmesg logs - nohup iperf3 -c 192.198.122.1 -p 6969 -t 8000 > iperf3client.log & - dmesg -w 5. Monitor the dmesg logs for OOM errors. == Here's a log from a previous run where we see OOM logs dumped on the console: [ 5] 1339.00-1340.00 sec 0.00 Bytes 0.00 bits/sec 0 1.41 KBytes [ 5] 1340.00-1341.00 sec 0.00 Bytes 0.00 bits/sec 0 1.41 KBytes [ 5] 1341.00-1342.00 sec 0.00 Bytes 0.00 bits/sec 0 1.41 KBytes [63842.605982] Out of memory: Killed process 1291 (systemd) total-vm:30016kB, anon-rss:4096kB, file-rss:6144kB, shmem-rss:0kB, UID:0 pgtables:32kB oom_score_adj:100 [63842.616019] Out of memory: Killed process 1293 ((sd-pam)) total-vm:33728kB, anon-rss:6208kB, file-rss:2048kB, shmem-rss:0kB, UID:0 pgtables:28kB oom_score_adj:100 [ 5] 1342.00-1343.00 sec 0.00 Bytes 0.00 bits/sec 0 1.41 KBytes [ 5] 1343.00-1344.00 sec 0.00 Bytes 0.00 bits/sec 0 1.41 KBytes [ 5] 1344.00-1345.00 sec 0.00 Bytes 0.00 bits/sec 0 1.41 KBytes [ 5] 1345.00-1346.00 sec 0.00 Bytes 0.00 bits/sec 0 1.41 KBytes [ 5] 1346.00-1347.00 sec 0.00 Bytes 0.00 bits/sec 0 1.41 KBytes [ 5] 1347.00-1348.00 sec 0.00 Bytes 0.00 bits/sec 0 1.41 KBytes [ 5] 1348.00-1349.00 sec 0.00 Bytes 0.00 bits/sec 0 1.41 KBytes [ 5] 1349.00-1350.00 sec 0.00 Bytes 0.00 bits/sec 0 1.41 KBytes [ 5] 1350.00-1351.00 sec 0.00 Bytes 0.00 bits/sec 0 1.41 KBytes [ 5] 1351.00-1352.00 sec 0.00 Bytes 0.00 bits/sec 0 1.41 KBytes [ 5] 1352.00-1353.00 sec 0.00 Bytes 0.00 bits/sec 0 1.41 KBytes [ 5] 1353.00-1354.00 sec 0.00 Bytes 0.00 bits/sec 0 1.41 KBytes [ 5] 1354.00-1355.00 sec 0.00 Bytes 0.00 bits/sec 0 1.41 KBytes [ 5] 1355.00-1356.00 sec 0.00 Bytes 0.00 bits/sec 0 1.41 KBytes [ 5] 1356.00-1357.00 sec 0.00 Bytes 0.00 bits/sec 0 1.41 KBytes [63858.021746] Out of memory: Killed process 968 (named) total-vm:217088kB, anon-rss:77760kB, file-rss:6144kB, shmem-rss:0kB, UID:106 pgtables:42kB oom_score_adj:0 [ 5] 1357.00-1358.00 sec 0.00 Bytes 0.00 bits/sec 0 1.41 KBytes [ 5] 1358.00-1359.00 sec 0.00 Bytes 0.00 bits/sec 0 1.41 KBytes [ 5] 1359.00-1360.00 sec 0.00 Bytes 0.00 bits/sec 0 1.41 KBytes [ 5] 1360.00-1361.00 sec 0.00 Bytes 0.00 bits/sec 0 1.41 KBytes Some insight from recent tests: 1. This issue is not reproducible when the iperf3 guest and host are both run on the LPAR itself. 2. Issue is also not reproducible with virtio driver (All the previous tests have been with RTL8139 driver). To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu-power-systems/+bug/2143080/+subscriptions
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