Re: Latest net-next from GIT panic

On Wed, 2017-09-20 at 10:50 -0700, Cong Wang wrote:

On Wed, Sep 20, 2017 at 6:11 AM, Eric Dumazet [off-list ref] wrote:

quoted

Sorry for top-posting, but this is to give context to Wei, since Pawel
used a top posting way to report his bisection.

Wei, can you take a look at Pawel report ?

Crash happens in dst_destroy() at following :

if (dst->dev)
     dev_put(dst->dev); <<CRASH>>


dst->dev is not NULL, but netdev->pcpu_refcnt is NULL

65 ff 08                decl   %gs:(%rax)   // CRASH since rax = NULL



Pawel, please share your netdevices and routing setup  ?

Looks like a double dev_put() on some dev...

Pawel, do you have any idea how this is triggered? Does your
test try to remove some network device? If so which one?
I noticed you have at least multiple vlan, bond and ixgbe
devices.

Or a missing dev_hold() somewhere.