Michal Koutný d5b11bd893 cgroup: Remove duplicates in cgroup v1 tasks file ... commit 1ca0b60515 upstream. One PID may appear multiple times in a preloaded pidlist. (Possibly due to PID recycling but we have reports of the same task_struct appearing with different PIDs, thus possibly involving transfer of PID via de_thread().) Because v1 seq_file iterator uses PIDs as position, it leads to a message: > seq_file: buggy .next function kernfs_seq_next did not update position index Conservative and quick fix consists of removing duplicates from `tasks` file (as opposed to removing pidlists altogether). It doesn't affect correctness (it's sufficient to show a PID once), performance impact would be hidden by unconditional sorting of the pidlist already in place (asymptotically). Link: https://lore.kernel.org/r/20230823174804.23632-1-mkoutny@suse.com/ Suggested-by: Firo Yang <firo.yang@suse.com> Signed-off-by: Michal Koutný <mkoutny@suse.com> Signed-off-by: Tejun Heo <tj@kernel.org> Cc: stable@vger.kernel.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2023-10-25 11:53:19 +02:00
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cgroup-internal.h	memcg: fix possible use-after-free in memcg_write_event_control()	2022-12-14 11:30:43 +01:00
cgroup-v1.c	cgroup: Remove duplicates in cgroup v1 tasks file	2023-10-25 11:53:19 +02:00
cgroup.c	cgroup: Do not corrupt task iteration when rebinding subsystem	2023-06-28 10:18:36 +02:00
cpuset.c	cgroup/cpuset: Wake up cpuset_attach_wq tasks in cpuset_cancel_attach()	2023-04-20 12:07:32 +02:00
debug.c
freezer.c	cgroup: freezer: don't change task and cgroups status unnecessarily	2019-12-31 16:45:06 +01:00
legacy_freezer.c
Makefile
namespace.c
pids.c
rdma.c
rstat.c	Revert "cgroup: Add memory barriers to plug cgroup_rstat_updated() race window"	2020-06-07 13:18:46 +02:00