In the Linux kernel, the following vulnerability has been resolved:
cgroup: Add missing cpusreadlock() to cgroupattachtask_all()
syzbot is hitting percpurwsemassertheld(&cpuhotpluglock) warning at cpusetattach() [1], for commit 4f7e7236435ca0ab ("cgroup: Fix threadgrouprwsem <-> cpusreadlock() deadlock") missed that cpusetattach() is also called from cgroupattachtaskall(). Add cpusreadlock() like what cgroupprocswritestart() does.