This bug is awaiting verification that the kernel in -proposed solves the problem. Please test the kernel and update this bug with the results. If the problem is solved, change the tag 'verification-needed- bionic' to 'verification-done-bionic'. If the problem still exists, change the tag 'verification-needed-bionic' to 'verification-failed- bionic'.
If verification is not done by 5 working days from today, this fix will be dropped from the source code, and this bug will be closed. See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to enable and use -proposed. Thank you! ** Tags added: verification-needed-bionic -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1886859 Title: memory is leaked when tasks are moved to net_prio Status in linux package in Ubuntu: Invalid Status in linux source package in Bionic: Fix Committed Status in linux source package in Focal: Fix Committed Bug description: [Impact] In some container scenarios, there will be a memory leak, leading to OOM. [Test case] Run the following: while true ; do mkdir net_prio/a unified/a ; bash -c 'echo $$ > unified/a/cgroup.procs ; echo $$ > net_prio/a/tasks ; ping -c 1 localhost > /dev/null' ; rmdir net_prio/a unified/a ; done Or the attached program cgroup_leak.c, which is faster. A leak would be produced without the fix, while there should be no constant leak with the fix applied. [Potential regression] This patch has also caused breakage with BPF cgroup in the past, when racing with its disabling, when one attachs a process to netprio cgroup. Similar breakage could happen. --------------------------------- When net_prio is used without setting ifpriomap and BFP cgroup is used, memory may be leaked. This was fixed by upstream commit 090e28b229af92dc5b40786ca673999d59e73056, but it had to be reverted to fix LP #1886668. When a real fix for this cgroup BFP crash lands, this patch should be reinstated. Cascardo. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1886859/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
