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Merge branch 'for-4.14-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup

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Pull cgroup fix from Tejun Heo:
 "The recent migration code updates assumed that migrations always
  execute from the top to the bottom once and didn't clean up internal
  states after each migration round; however, cgroup_transfer_tasks()
  repeats the inner steps multiple times and the garbage internal states
  from the previous iteration led to OOPS.

  Waiman fixed the bug by reinitializing the relevant states at the end
  of each migration round"

* 'for-4.14-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup:
  cgroup: Reinit cgroup_taskset structure before cgroup_migrate_execute() returns
This commit is contained in:
Linus Torvalds 2017-10-03 10:40:36 -07:00
commit 847d9fb477
1 changed files with 8 additions and 0 deletions
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8
kernel/cgroup/cgroup.c
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@ -2311,6 +2311,14 @@ out_release_tset:
list_del_init(&cset->mg_node);
}
spin_unlock_irq(&css_set_lock);
/*
* Re-initialize the cgroup_taskset structure in case it is reused
* again in another cgroup_migrate_add_task()/cgroup_migrate_execute()
* iteration.
*/
tset->nr_tasks = 0;
tset->csets = &tset->src_csets;
return ret;
}