On Mon, Jun 20, 2016 at 06:14:01AM +0000, AMIT NAGAL wrote:
> Hi
> I am using Linux kernel version 3.10.28 (ARM platform) .
> I am getting NULL pointer dereference in tg_load_down() .
> At the time of error , tg->parent->cfs_rq value is 0 and tg->se value is
> 0x00000400 . ( refer to backtrace in 5) ).
Were you destroying cgroups at the time?
If so, there were some problems with cgroup teardown recently, see
patches:
6fe1f348b3dd ("sched/cgroup: Fix cgroup entity load tracking tear-down")
2f5177f0fd7e ("sched/cgroup: Fix/cleanup cgroup teardown/init")
Which depend on:
aa226ff4a1ce ("cgroup: make sure a parent css isn't offlined before its
children")
8bb5ef79bc0f ("cgroup: make sure a parent css isn't freed before its
children")
I've no idea if any of that is relevant to your ancient kernel, let
alone applies, that's your problem for using ancient wares.
If you can reproduce with a current kernel (4.6+) then I might look more.
