netlink: 8 bytes leftover after parsing attributes in process `syz-executor0'.
netlink: 8 bytes leftover after parsing attributes in process `syz-executor0'.

===============================
[ INFO: suspicious RCU usage. ]
4.4.159+ #44 Not tainted
-------------------------------
net/ipv4/xfrm4_protocol.c:80 suspicious rcu_dereference_check() usage!

other info that might help us debug this:


rcu_scheduler_active = 1, debug_locks = 0
no locks held by syz-executor3/3790.

stack backtrace:
CPU: 1 PID: 3790 Comm: syz-executor3 Not tainted 4.4.159+ #44
 0000000000000000 acf454bdabcac103 ffff8800a586f730 ffffffff81a994bd
 ffff8801bfccdf00 0000000000000000 0000000000000001 ffffffff82a90a40
 0000000000000002 ffff8800a586f760 ffffffff813a7ff2 ffffffff831abe40
Call Trace:
 [<ffffffff81a994bd>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81a994bd>] dump_stack+0xc1/0x124 lib/dump_stack.c:51
 [<ffffffff813a7ff2>] lockdep_rcu_suspicious.cold.30+0x110/0x141 kernel/locking/lockdep.c:4305
 [<ffffffff8252f41a>] xfrm4_rcv_encap+0x30a/0x370 net/ipv4/xfrm4_protocol.c:80
 [<ffffffff8252d925>] xfrm4_udp_encap_rcv+0x445/0x6b0 net/ipv4/xfrm4_input.c:148
 [<ffffffff8246f632>] udp_queue_rcv_skb+0xe72/0x1530 net/ipv4/udp.c:1547
 [<ffffffff821d0a9b>] sk_backlog_rcv include/net/sock.h:871 [inline]
 [<ffffffff821d0a9b>] __release_sock net/core/sock.c:2023 [inline]
 [<ffffffff821d0a9b>] release_sock+0x17b/0x500 net/core/sock.c:2473
 [<ffffffff8246cbb2>] udp_sendmsg+0x1152/0x1c70 net/ipv4/udp.c:1107
 [<ffffffff824963c3>] inet_sendmsg+0x203/0x4d0 net/ipv4/af_inet.c:755
 [<ffffffff821c2ebb>] sock_sendmsg_nosec net/socket.c:638 [inline]
 [<ffffffff821c2ebb>] sock_sendmsg+0xbb/0x110 net/socket.c:648
 [<ffffffff821c3133>] sock_write_iter+0x223/0x3b0 net/socket.c:847
 [<ffffffff81490fa4>] new_sync_write fs/read_write.c:478 [inline]
 [<ffffffff81490fa4>] __vfs_write+0x304/0x3e0 fs/read_write.c:491
 [<ffffffff81492a6e>] vfs_write+0x17e/0x4e0 fs/read_write.c:538
 [<ffffffff814950a9>] SYSC_write fs/read_write.c:585 [inline]
 [<ffffffff814950a9>] SyS_write+0xd9/0x1c0 fs/read_write.c:577
 [<ffffffff8100629e>] do_syscall_32_irqs_on arch/x86/entry/common.c:396 [inline]
 [<ffffffff8100629e>] do_fast_syscall_32+0x31e/0xa80 arch/x86/entry/common.c:463
 [<ffffffff82707410>] sysenter_flags_fixed+0xd/0x1a
blk_update_request: I/O error, dev loop0, sector 256
Buffer I/O error on dev loop0, logical block 256, lost async page write
blk_update_request: I/O error, dev loop0, sector 257
Buffer I/O error on dev loop0, logical block 257, lost async page write
blk_update_request: I/O error, dev loop0, sector 258
Buffer I/O error on dev loop0, logical block 258, lost async page write
blk_update_request: I/O error, dev loop0, sector 259
Buffer I/O error on dev loop0, logical block 259, lost async page write
blk_update_request: I/O error, dev loop0, sector 260
Buffer I/O error on dev loop0, logical block 260, lost async page write
blk_update_request: I/O error, dev loop0, sector 261
Buffer I/O error on dev loop0, logical block 261, lost async page write
blk_update_request: I/O error, dev loop0, sector 262
Buffer I/O error on dev loop0, logical block 262, lost async page write
blk_update_request: I/O error, dev loop0, sector 263
Buffer I/O error on dev loop0, logical block 263, lost async page write
VFS: Dirty inode writeback failed for block device loop0 (err=-5).
uinput: write device info first
uinput: write device info first
uinput: write device info first
blk_update_request: I/O error, dev loop0, sector 145
Buffer I/O error on dev loop0, logical block 145, lost async page write
blk_update_request: I/O error, dev loop0, sector 146
Buffer I/O error on dev loop0, logical block 146, lost async page write
uinput: write device info first
uinput: write device info first
uinput: write device info first
uinput: write device info first
uinput: write device info first
uinput: write device info first
uinput: write device info first
uinput: write device info first
uinput: write device info first
uinput: write device info first
uinput: write device info first
uinput: write device info first
uinput: write device info first
uinput: write device info first
uinput: write device info first
uinput: write device info first
uinput: write device info first
uinput: write device info first
blk_update_request: 24 callbacks suppressed
blk_update_request: I/O error, dev loop0, sector 1272
buffer_io_error: 22 callbacks suppressed
Buffer I/O error on dev loop0, logical block 159, lost async page write
blk_update_request: I/O error, dev loop0, sector 1040
Buffer I/O error on dev loop0, logical block 130, lost async page write
blk_update_request: I/O error, dev loop0, sector 1464
Buffer I/O error on dev loop0, logical block 183, lost async page write
blk_update_request: I/O error, dev loop0, sector 1528
Buffer I/O error on dev loop0, logical block 191, lost async page write