linux-next 20160420 is whining at an incredible rate - in 20 minutes of uptime, I piled up some 41,000 hits from all over the place (cleaned up to skip the CPU and PID so the list isn't quite so long):
% grep include/net/sock.h /var/log/messages | cut -f5- -d: | sed -e 's/PID:
[0-9]* /PID: (elided) /' -e 's/CPU: [0-3]/CPU: +/' | sort | uniq -c | sort -nr
13468 CPU: + PID: (elided) at include/net/sock.h:1408 tcp_v6_rcv+0xc20/0xcb0
9770 CPU: + PID: (elided) at include/net/sock.h:1408
udp_queue_rcv_skb+0x3ca/0x6d0
7706 CPU: + PID: (elided) at include/net/sock.h:1408
sock_owned_by_user+0x91/0xa0
2818 CPU: + PID: (elided) at include/net/sock.h:1408
udpv6_queue_rcv_skb+0x3b6/0x6d0
1981 CPU: + PID: (elided) at include/net/sock.h:1408
tcp_write_timer+0xf2/0x110
1954 CPU: + PID: (elided) at include/net/sock.h:1408
tcp_delack_timer+0x110/0x130
1912 CPU: + PID: (elided) at include/net/sock.h:1408
tcp_keepalive_timer+0x136/0x2c0
882 CPU: + PID: (elided) at include/net/sock.h:1408 tcp_close+0x226/0x4f0
804 CPU: + PID: (elided) at include/net/sock.h:1408
tcp_tasklet_func+0x192/0x1e0
28 CPU: + PID: (elided) at include/net/sock.h:1408
tcp_child_process+0x17a/0x350
2 CPU: + PID: (elided) at include/net/sock.h:1408 tcp_v6_err+0x401/0x660
2 CPU: + PID: (elided) at include/net/sock.h:1408 tcp_v6_err+0x1fd/0x660
Seems to be from this commit, which is apparently over-stringent or
isn't handling some case correctly:
commit fafc4e1ea1a4c1eb13a30c9426fb799f5efacbc3
Author: Hannes Frederic Sowa <han...@stressinduktion.org>
Date: Fri Apr 8 15:11:27 2016 +0200
sock: tigthen lockdep checks for sock_owned_by_user
sock_owned_by_user should not be used without socket lock held. It seems
to be a common practice to check .owned before lock reclassification, so
provide a little help to abstract this check away.
Cc: linux-c...@vger.kernel.org
Cc: linux-blueto...@vger.kernel.org
Cc: linux-...@vger.kernel.org
Signed-off-by: Hannes Frederic Sowa <han...@stressinduktion.org>
Signed-off-by: David S. Miller <da...@davemloft.net>
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