Re: BUG: Unable to handle kernel paging request for data at address __percpu_counter_add

From: Tejun Heo
Date: Mon Nov 23 2015 - 16:13:39 EST


On Thu, Nov 19, 2015 at 03:54:35PM +0530, Raghavendra K T wrote:
> While I was creating thousands of docker container on a power8 baremetal
> (config: 4.3.0 kernel 1TB RAM, 20core (=160 cpu) system. After creating
> around 5600 container
> I have hit below problem.
> [This is looking similar to
>, but
> kernel had Revert "ext4: remove block_device_ejected" (bdfe0cbd746aa9) since
> it is 4.3.0 tagged kernel]
> Any hints on how to go about the fix. Please let me know if you think any
> more information needed.
> docker daemon is device mapper based. (and it took a day to recreate the
> problem)
> [ by disabling CONFIG_BLK_CGROUP and CONFIG_CGROUP_WRITEBACK I am able to
> create 10k containers without any problem]

Could be the same problem that Ilya is trying to fix. ie. blkdev i_wb
pointing to a stale wb. Can you please see whether the following
patch resolves the issue?


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