Hi,
please include this 4.9-rc1 commit in stable trees:
commit cebf8fd16900fdfd58c0028617944f808f97fe50
Author: Ming Lei <ming.lei@xxxxxxxxxxxxx>
Date: Sun Jul 10 19:27:36 2016 +0800
driver core: fix race between creating/querying glue dir and its cleanup
It fixes an issue which can be easily triggered by:
while :; do for aa in `seq 1 10`; do ./pps & done; wait; done
where pps is from:
https://github.com/jirislaby/collected_sources/blob/master/pps.c
and the result is:
WARNING: CPU: 2 PID: 13078 at include/linux/kref.h:47
kobject_get+0x46/0x60()
I.e. kref->refcount is < 2.
It can be reproduced on 3.12 too. So older kernels are very likely
affected too.
For 3.12, I added also this 4.1-rc1 commit:
commit 5f0163a5ee9cc7c59751768bdfd94a73186debba
Author: Markus Elfring <elfring@xxxxxxxxxxxxxxxxxxxxx>
Date: Thu Feb 5 11:48:26 2015 +0100
driver core: Delete an unnecessary check before the function call
"put_device"
to let the former apply cleanly.
thanks,
--
js
suse labs
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