======================================
| [ 248.149338][ T55] #0: ffff8880010a9548 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work (kernel/workqueue.c:3210 (discriminator 4)) 
| [ 248.149630][ T55] #1: ffffc900003bfd40 ((work_completion)(&trans->work)){+.+.}-{0:0}, at: process_one_work (kernel/workqueue.c:3212) 
| [  248.149912][   T55]
| [  248.149912][   T55] stack backtrace:
[  248.150088][   T55] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[  248.150090][   T55] Workqueue: events xfrm_trans_reinject
[  248.150097][   T55] Call Trace:
[  248.150099][   T55]  <TASK>
[ 248.150102][ T55] dump_stack_lvl (lib/dump_stack.c:123) 
[ 248.150110][ T55] lockdep_rcu_suspicious (kernel/locking/lockdep.c:6848) 
[ 248.150121][ T55] ip6_input (./include/net/net_namespace.h:404 ./include/linux/netdevice.h:2669 net/ipv6/ip6_input.c:490) 
[ 248.150127][ T55] ? __pfx_ip6_input (net/ipv6/ip6_input.c:489) 
[ 248.150130][ T55] ? 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) 
[ 248.150133][ T55] ? mark_lock (kernel/locking/lockdep.c:4729 (discriminator 3)) 
[ 248.150141][ T55] ? mark_held_locks (kernel/locking/lockdep.c:4323) 
[ 248.150151][ T55] ? __pfx_ip6_rcv_finish (net/ipv6/ip6_input.c:70) 
[ 248.150157][ T55] xfrm_trans_reinject (net/xfrm/xfrm_input.c:787) 
[ 248.150161][ T55] ? lock_acquire.part.0 (kernel/locking/lockdep.c:469 kernel/locking/lockdep.c:5853) 
[ 248.150167][ T55] ? __pfx_xfrm_trans_reinject (net/xfrm/xfrm_input.c:775) 
[ 248.150174][ T55] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5816) 
[ 248.150180][ T55] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 21)) 
[ 248.150183][ T55] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 21)) 
[ 248.150189][ T55] ? lock_acquire (kernel/locking/lockdep.c:5824) 
[ 248.150192][ T55] ? process_one_work (kernel/workqueue.c:3212) 
[ 248.150201][ T55] process_one_work (kernel/workqueue.c:3236) 
[ 248.150214][ T55] ? __pfx___lock_release (kernel/locking/lockdep.c:5503) 
[ 248.150220][ T55] ? __pfx_process_one_work (kernel/workqueue.c:3138) 
[ 248.150233][ T55] ? assign_work (kernel/workqueue.c:1200) 
[ 248.150243][ T55] worker_thread (kernel/workqueue.c:3311 kernel/workqueue.c:3398) 
[ 248.150250][ T55] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4349 kernel/locking/lockdep.c:4408) 
[ 248.150261][ T55] ? __pfx_worker_thread (kernel/workqueue.c:3344) 
[ 248.150267][ T55] kthread (kernel/kthread.c:464) 
[ 248.150272][ T55] ? __pfx_kthread (kernel/kthread.c:413) 
[ 248.150281][ T55] ? __pfx_kthread (kernel/kthread.c:413) 
[ 248.150287][ T55] ret_from_fork (arch/x86/kernel/process.c:148) 
[ 248.150291][ T55] ? __pfx_kthread (kernel/kthread.c:413) 


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