[lkml]   [2020]   [Apr]   [26]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: INFO: rcu detected stall in wg_packet_tx_worker
On Sun, Apr 26, 2020 at 1:52 PM Jason A. Donenfeld <> wrote:
> It looks like part of the issue might be that I call
> udp_tunnel6_xmit_skb while holding rcu_read_lock_bh, in
> drivers/net/wireguard/socket.c. But I think there's good reason to do
> so, and udp_tunnel6_xmit_skb should be rcu safe. In fact,
> every.single.other user of udp_tunnel6_xmit_skb in the kernel uses it
> with rcu locked. So, hm...

In the syzkaller log, it looks like several runs are hitting:

run #0: crashed: INFO: rcu detected stall in netlink_sendmsg

And other runs are hitting yet different functions. So actually, it's
not clear that this is the fault of the call to udp_tunnel6_xmit_skb.

 \ /
  Last update: 2020-04-26 22:00    [W:0.045 / U:12.988 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site