======================================
| [ 19.772690][ T9] #0: ffff8880010a9548 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work (kernel/workqueue.c:3210 (discriminator 4)) 
| [ 19.772984][ T9] #1: ffffc90000097d40 ((work_completion)(&trans->work)){+.+.}-{0:0}, at: process_one_work (kernel/workqueue.c:3212) 
| [   19.773266][    T9]
| [   19.773266][    T9] stack backtrace:
[   19.773453][    T9] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   19.773456][    T9] Workqueue: events xfrm_trans_reinject
[   19.773462][    T9] Call Trace:
[   19.773464][    T9]  <TASK>
[ 19.773467][ T9] dump_stack_lvl (lib/dump_stack.c:123) 
[ 19.773475][ T9] lockdep_rcu_suspicious (kernel/locking/lockdep.c:6848) 
[ 19.773485][ T9] ip6_input (./include/net/net_namespace.h:404 ./include/linux/netdevice.h:2669 net/ipv6/ip6_input.c:490) 
[ 19.773491][ T9] ? __pfx_ip6_input (net/ipv6/ip6_input.c:489) 
[ 19.773495][ T9] ? hlock_class (./arch/x86/include/asm/bitops.h:227 ./arch/x86/include/asm/bitops.h:239 ./include/asm-generic/bitops/instrumented-non-atomic.h:142 kernel/locking/lockdep.c:230) 
[ 19.773498][ T9] ? mark_lock (kernel/locking/lockdep.c:4729 (discriminator 3)) 
[ 19.773506][ T9] ? mark_held_locks (kernel/locking/lockdep.c:4323) 
[ 19.773515][ T9] ? __pfx_ip6_rcv_finish (net/ipv6/ip6_input.c:70) 
[ 19.773521][ T9] xfrm_trans_reinject (net/xfrm/xfrm_input.c:787) 
[ 19.773525][ T9] ? lock_acquire.part.0 (kernel/locking/lockdep.c:469 kernel/locking/lockdep.c:5853) 
[ 19.773531][ T9] ? __pfx_xfrm_trans_reinject (net/xfrm/xfrm_input.c:775) 
[ 19.773538][ T9] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5816) 
[ 19.773544][ T9] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 21)) 
[ 19.773546][ T9] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 21)) 
[ 19.773553][ T9] ? lock_acquire (kernel/locking/lockdep.c:5824) 
[ 19.773556][ T9] ? process_one_work (kernel/workqueue.c:3212) 
[ 19.773565][ T9] process_one_work (kernel/workqueue.c:3236) 
[ 19.773578][ T9] ? __pfx___lock_release (kernel/locking/lockdep.c:5503) 
[ 19.773583][ T9] ? __pfx_process_one_work (kernel/workqueue.c:3138) 
[ 19.773596][ T9] ? assign_work (kernel/workqueue.c:1200) 
[ 19.773607][ T9] worker_thread (kernel/workqueue.c:3311 kernel/workqueue.c:3398) 
[ 19.773612][ T9] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4349 kernel/locking/lockdep.c:4408) 
[ 19.773623][ T9] ? __pfx_worker_thread (kernel/workqueue.c:3344) 
[ 19.773629][ T9] kthread (kernel/kthread.c:464) 
[ 19.773635][ T9] ? __pfx_kthread (kernel/kthread.c:413) 
[ 19.773644][ T9] ? __pfx_kthread (kernel/kthread.c:413) 
[ 19.773649][ T9] ret_from_fork (arch/x86/kernel/process.c:148) 
[ 19.773655][ T9] ? __pfx_kthread (kernel/kthread.c:413) 


Finger prints:
lockdep_rcu_suspicious:ip6_input:xfrm_trans_reinject:process_one_work:worker_thread