From: Toshiaki Makita
Date: Mon, 28 May 2018 19:37:49 +0900
> Calling XDP redirection requires bh disabled. Softirq can call another
> XDP function and redirection functions, then the percpu static variable
> ri->map can be overwritten to NULL.
...
> v2:
> - Removed preempt_disable/enable since
On 2018年05月28日 18:37, Toshiaki Makita wrote:
Calling XDP redirection requires bh disabled. Softirq can call another
XDP function and redirection functions, then the percpu static variable
ri->map can be overwritten to NULL.
This is a generic XDP case called from tun.
[ 3535.736058] BUG: unab
Calling XDP redirection requires bh disabled. Softirq can call another
XDP function and redirection functions, then the percpu static variable
ri->map can be overwritten to NULL.
This is a generic XDP case called from tun.
[ 3535.736058] BUG: unable to handle kernel NULL pointer dereference at
0
