ACK: [SRU D/E/F/G/U 0/1] Revert code that causes crashes on default configurations

Ian May ian.may at
Thu Jul 9 20:33:10 UTC 2020

Acked-by: Ian May <ian.may at>

On 7/9/20 2:54 PM, Thadeu Lima de Souza Cascardo wrote:
> BugLink:
> This is the same patch as sent to Bionic 4.15 kernels.
> [Impact]
> On systems using cgroups and sockets extensively, like docker, kubernetes,
> lxd, libvirt, a crash might happen when using linux 4.15.0-109-generic.
> [Fix]
> Revert the patch that disables sk_alloc cgroup refcounting when tasks
> are added to net_prio cgroup.
> [Test case]
> Test that such environments where the issue is reproduced survive some hours of
> uptime. A different bug was reproduced with a work-in-progress code and was not
> reproduced with the culprit reverted.
> [Regression potential]
> The reverted commit fix a memory leak on similar scenarios. But a leak is
> better than a crash. Two other bugs have been opened to track a real fix for
> this issue and the leak.
> Thadeu Lima de Souza Cascardo (1):
>   UBUNTU: SAUCE: Revert "netprio_cgroup: Fix unlimited memory leak of v2
>     cgroups"
>  net/core/netprio_cgroup.c | 2 --
>  1 file changed, 2 deletions(-)

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