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On a system with memory-constrained cgroups, it is possible for a non-root user to lock up the system by continuously spawning new processes within a cgroup which is already in an OOM event. Upstream patches: The deadlock was inherent in the original memcg OOM killer design, so the entire rewrite of that mechanism is required for the fix: http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id= 759496ba6407c6994d6a5ce3a5e74937d7816208 3a13c4d761b4b979ba8767f42345fed3274991b0 519e52473ebe9db5cdef44670d5a97f1fd53d721 fb2a6fc56be66c169f8b80e07ed999ba453a2db2 3812c8c8f3953921ef18544110dafc3505c1ac62 4942642080ea82d99ab5b653abb9a12b7ba31f4a 84235de394d9775bfaa7fa9762a59d91fef0c1fc a0d8b00a3381f9d75764b3377590451cb0b4fe41 1f14c1ac19aa45118054b6d5425873c5c7fc23a1 3168ecbe1c04ec3feb7cb42388a17d7f047fe1a2
Statement: This issue does not affect the Linux kernel versions as shipped with Red Hat Enterprise Linux 5. This issue does affect the Linux kernel versions as shipped with Red Hat Enterprise Linux 6, 7 and Red Hat Enterprise MRG 2. Future updates may address this issue in the respective releases.
This issue has been addressed in the following products: Red Hat Enterprise Linux 6 Via RHSA-2015:0864 https://rhn.redhat.com/errata/RHSA-2015-0864.html
This issue has been addressed in the following products: Red Hat Enterprise Linux 7 Via RHSA-2015:2411 https://rhn.redhat.com/errata/RHSA-2015-2411.html
This issue has been addressed in the following products: Red Hat Enterprise Linux 7 Via RHSA-2015:2152 https://rhn.redhat.com/errata/RHSA-2015-2152.html