======================================
| [ 4217.655656][ T1528] #0: ffffffff92c59770 (cb_lock){++++}-{3:3}, at: genl_rcv (net/netlink/genetlink.c:1219) 
| [ 4217.655976][ T1528] #1: ffffffff92c02408 (rtnl_mutex){+.+.}-{3:3}, at: netdev_nl_napi_set_doit (net/core/netdev-genl.c:350) 
| [ 4217.656331][ T1528]
| [ 4217.656331][ T1528] stack backtrace:
[ 4217.656958][ T1528] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 4217.657202][ T1528] Call Trace:
[ 4217.657355][ T1528]  <TASK>
[ 4217.657467][ T1528] dump_stack_lvl (lib/dump_stack.c:123) 
[ 4217.657697][ T1528] lockdep_rcu_suspicious (kernel/locking/lockdep.c:6822) 
[ 4217.657903][ T1528] napi_by_id (net/core/dev.c:6300 (discriminator 7)) 
[ 4217.658060][ T1528] netdev_nl_napi_set_doit (net/core/netdev-genl.c:350) 
[ 4217.658264][ T1528] ? __pfx_netdev_nl_napi_set_doit (net/core/netdev-genl.c:338) 
[ 4217.658532][ T1528] ? __nla_parse (lib/nlattr.c:732) 
[ 4217.658735][ T1528] ? genl_family_rcv_msg_attrs_parse.constprop.0 (net/netlink/genetlink.c:947) 
[ 4217.659039][ T1528] genl_family_rcv_msg_doit (net/netlink/genetlink.c:1115) 
[ 4217.659252][ T1528] ? __pfx_genl_family_rcv_msg_doit (net/netlink/genetlink.c:1088) 
[ 4217.659504][ T1528] ? __pfx___lock_release (kernel/locking/lockdep.c:5477) 
[ 4217.659702][ T1528] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5790) 
[ 4217.659930][ T1528] ? validate_chain (kernel/locking/lockdep.c:3797 kernel/locking/lockdep.c:3817 kernel/locking/lockdep.c:3872) 
[ 4217.660150][ T1528] genl_family_rcv_msg (net/netlink/genetlink.c:1195) 
[ 4217.660353][ T1528] ? __pfx_genl_family_rcv_msg (net/netlink/genetlink.c:1160) 
[ 4217.660554][ T1528] ? __pfx_netdev_nl_napi_set_doit (net/core/netdev-genl.c:338) 
[ 4217.660823][ T1528] genl_rcv_msg (net/netlink/genetlink.c:65 net/netlink/genetlink.c:1211) 
[ 4217.661026][ T1528] netlink_rcv_skb (net/netlink/af_netlink.c:2551) 
[ 4217.661226][ T1528] ? __pfx_genl_rcv_msg (net/netlink/genetlink.c:1201) 
[ 4217.661428][ T1528] ? __pfx_netlink_rcv_skb (net/netlink/af_netlink.c:2528) 
[ 4217.661642][ T1528] ? genl_rcv (net/netlink/genetlink.c:1219) 
[ 4217.661800][ T1528] ? __pfx_down_read (kernel/locking/rwsem.c:1522) 
[ 4217.662001][ T1528] ? netlink_deliver_tap (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/netlink/af_netlink.c:340) 
[ 4217.662206][ T1528] genl_rcv (net/netlink/genetlink.c:1220) 
[ 4217.662366][ T1528] netlink_unicast (net/netlink/af_netlink.c:1331 net/netlink/af_netlink.c:1357) 
[ 4217.662581][ T1528] ? __pfx_netlink_unicast (net/netlink/af_netlink.c:1342) 
[ 4217.662779][ T1528] ? __wake_up (kernel/sched/wait.c:110 kernel/sched/wait.c:127) 
[ 4217.662936][ T1528] netlink_sendmsg (net/netlink/af_netlink.c:1901) 
[ 4217.663144][ T1528] ? __pfx_netlink_sendmsg (net/netlink/af_netlink.c:1820) 
[ 4217.663351][ T1528] ? fdget (./include/linux/atomic/atomic-arch-fallback.h:479 ./include/linux/atomic/atomic-instrumented.h:50 fs/file.c:1114 fs/file.c:1128) 
[ 4217.663521][ T1528] __sys_sendto (net/socket.c:729 net/socket.c:744 net/socket.c:2216) 
[ 4217.663721][ T1528] ? __pfx___sys_sendto (net/socket.c:2186) 
[ 4217.663933][ T1528] ? do_user_addr_fault (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 ./include/linux/mm.h:729 arch/x86/mm/fault.c:1340) 
[ 4217.664138][ T1528] ? __pfx___lock_release (kernel/locking/lockdep.c:5477) 
[ 4217.664337][ T1528] ? __up_read (./arch/x86/include/asm/atomic64_64.h:79 ./include/linux/atomic/atomic-arch-fallback.h:2749 ./include/linux/atomic/atomic-long.h:184 ./include/linux/atomic/atomic-instrumented.h:3317 kernel/locking/rwsem.c:1345) 
[ 4217.664540][ T1528] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 52)) 
[ 4217.664751][ T1528] ? __pfx___up_read (kernel/locking/rwsem.c:1337) 
[ 4217.664964][ T1528] ? do_user_addr_fault (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 ./include/linux/mm.h:729 arch/x86/mm/fault.c:1340) 
[ 4217.665162][ T1528] ? do_user_addr_fault (./include/linux/rcupdate.h:882 ./include/linux/mm.h:729 arch/x86/mm/fault.c:1340) 
[ 4217.665363][ T1528] __x64_sys_sendto (net/socket.c:2224) 
[ 4217.665557][ T1528] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4347 kernel/locking/lockdep.c:4406) 
[ 4217.665799][ T1528] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
[ 4217.665999][ T1528] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
[ 4217.666240][ T1528] RIP: 0033:0x7f147ba5f700
[ 4217.666447][ T1528] Code: Unable to access opcode bytes at 0x7f147ba5f6d6.

Code starting with the faulting instruction
===========================================
[ 4217.666730][ T1528] RSP: 002b:00007ffcb256a188 EFLAGS: 00000246 ORIG_RAX: 000000000000002c
[ 4217.667031][ T1528] RAX: ffffffffffffffda RBX: 00007ffcb256a1a0 RCX: 00007f147ba5f700
[ 4217.667333][ T1528] RDX: 0000000000000034 RSI: 00007f147b8cc270 RDI: 0000000000000005
[ 4217.667651][ T1528] RBP: 00007f147b8cc010 R08: 0000000000000000 R09: 0000000000000000
[ 4217.667952][ T1528] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000018f732f0


Finger prints:
lockdep_rcu_suspicious:napi_by_id:netdev_nl_napi_set_doit:genl_family_rcv_msg_doit:genl_family_rcv_msg