drivers/vhost/net.c:1010 vhost_net_rx_peek_head_len() error: double unlocked 'sk->sk_receive_queue.lock' (orig line 1002)

[kernel test robot <lkp@intel.com>]

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CC: kbuild-all(a)lists.01.org
CC: linux-kernel(a)vger.kernel.org
TO: Jason Wang <jasowang@redhat.com>
CC: "Michael S. Tsirkin" <mst@redhat.com>

Hi Jason,

First bad commit (maybe != root cause):

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   aa0c9086b40c17a7ad94425b3b70dd1fdd7497bf
commit: 20c384f1ea1a0bc7320bc445c72dd02d2970d594 vhost: refine vhost and vringh kconfig
date:   3 months ago
:::::: branch date: 4 hours ago
:::::: commit date: 3 months ago
config: microblaze-randconfig-m031-20200711 (attached as .config)
compiler: microblaze-linux-gcc (GCC) 9.3.0

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>

New smatch warnings:
drivers/vhost/net.c:1010 vhost_net_rx_peek_head_len() error: double unlocked 'sk->sk_receive_queue.lock' (orig line 1002)
drivers/vhost/net.c:1010 vhost_net_rx_peek_head_len() error: double unlocked 'sk->sk_receive_queue.lock' (orig line 1002)
drivers/vhost/net.c:1010 vhost_net_rx_peek_head_len() error: double unlocked 'sk->sk_receive_queue.lock' (orig line 1002)

Old smatch warnings:
arch/microblaze/include/asm/thread_info.h:94 current_thread_info() error: uninitialized symbol 'sp'.
drivers/vhost/net.c:1528 vhost_net_set_backend() warn: passing a valid pointer to 'PTR_ERR'

# https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=20c384f1ea1a0bc7320bc445c72dd02d2970d594
git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
git remote update linus
git checkout 20c384f1ea1a0bc7320bc445c72dd02d2970d594
vim +1010 drivers/vhost/net.c

8dd014adfea6f1 David Stevens   2010-07-27   994  
be294a51adfc1e Toshiaki Makita 2018-07-03   995  static int vhost_net_rx_peek_head_len(struct vhost_net *net, struct sock *sk,
be294a51adfc1e Toshiaki Makita 2018-07-03   996  				      bool *busyloop_intr)
03088137246065 Jason Wang      2016-03-04   997  {
28b9b33b983f4d Toshiaki Makita 2018-07-03   998  	struct vhost_net_virtqueue *rnvq = &net->vqs[VHOST_NET_VQ_RX];
28b9b33b983f4d Toshiaki Makita 2018-07-03   999  	struct vhost_net_virtqueue *tnvq = &net->vqs[VHOST_NET_VQ_TX];
6369fec5be0aad Toshiaki Makita 2018-07-03  1000  	struct vhost_virtqueue *rvq = &rnvq->vq;
28b9b33b983f4d Toshiaki Makita 2018-07-03  1001  	struct vhost_virtqueue *tvq = &tnvq->vq;
28b9b33b983f4d Toshiaki Makita 2018-07-03 @1002  	int len = peek_head_len(rnvq, sk);
03088137246065 Jason Wang      2016-03-04  1003  
dc151282bbdaed Tonghao Zhang   2018-09-25  1004  	if (!len && rvq->busyloop_timeout) {
f5a4941aa6d190 Jason Wang      2018-05-29  1005  		/* Flush batched heads first */
09c3248938c3e3 Jason Wang      2018-07-20  1006  		vhost_net_signal_used(rnvq);
03088137246065 Jason Wang      2016-03-04  1007  		/* Both tx vq and rx socket were polled here */
dc151282bbdaed Tonghao Zhang   2018-09-25  1008  		vhost_net_busy_poll(net, rvq, tvq, busyloop_intr, true);
03088137246065 Jason Wang      2016-03-04  1009  
28b9b33b983f4d Toshiaki Makita 2018-07-03 @1010  		len = peek_head_len(rnvq, sk);
03088137246065 Jason Wang      2016-03-04  1011  	}
03088137246065 Jason Wang      2016-03-04  1012  
03088137246065 Jason Wang      2016-03-04  1013  	return len;
03088137246065 Jason Wang      2016-03-04  1014  }
03088137246065 Jason Wang      2016-03-04  1015  

:::::: The code at line 1010 was first introduced by commit
:::::: 28b9b33b983f4de3ce9e660e3efe1e08adabf779 vhost_net: Rename local variables in vhost_net_rx_peek_head_len

:::::: TO: Toshiaki Makita <makita.toshiaki@lab.ntt.co.jp>
:::::: CC: David S. Miller <davem@davemloft.net>

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all(a)lists.01.org

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