** Changed in: linux (Ubuntu Bionic)
Status: In Progress => Fix Committed
** Changed in: linux (Ubuntu Focal)
Status: In Progress => Fix Committed
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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.
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