Messages in this thread | | | From | "Jason A. Donenfeld" <> | Date | Sun, 26 Apr 2020 13:58:20 -0600 | Subject | Re: INFO: rcu detected stall in wg_packet_tx_worker |
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On Sun, Apr 26, 2020 at 1:52 PM Jason A. Donenfeld <Jason@zx2c4.com> 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.
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