torvalds-linux

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History

Tetsuo Handa 43626dade3 cgroup: Add missing cpus_read_lock() to cgroup_attach_task_all()

syzbot is hitting percpu_rwsem_assert_held(&cpu_hotplug_lock) warning at
cpuset_attach() [1], for commit 4f7e7236435ca0ab ("cgroup: Fix
threadgroup_rwsem <-> cpus_read_lock() deadlock") missed that
cpuset_attach() is also called from cgroup_attach_task_all().
Add cpus_read_lock() like what cgroup_procs_write_start() does.

Link: https://syzkaller.appspot.com/bug?extid=29d3a3b4d86c8136ad9e [1]
Reported-by: syzbot <syzbot+29d3a3b4d86c8136ad9e@syzkaller.appspotmail.com>
Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Fixes: 4f7e7236435ca0ab ("cgroup: Fix threadgroup_rwsem <-> cpus_read_lock() deadlock")
Signed-off-by: Tejun Heo <tj@kernel.org>

2022-08-25 07:36:30 -10:00

cgroup-internal.h

cgroup: Make !percpu threadgroup_rwsem operations optional

2022-07-23 04:29:02 -10:00

cgroup-v1.c

cgroup: Add missing cpus_read_lock() to cgroup_attach_task_all()

2022-08-25 07:36:30 -10:00

cgroup.c

cgroup: Fix race condition at rebind_subsystems()

2022-08-23 08:11:06 -10:00

cpuset.c

cgroup: Fix threadgroup_rwsem <-> cpus_read_lock() deadlock