======================================
| [ 4326.037111][ T50] #0: ffff8880010a9548 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work (kernel/workqueue.c:3210 (discriminator 4)) 
| [ 4326.037439][ T50] #1: ffffc9000036fd40 ((work_completion)(&trans->work)){+.+.}-{0:0}, at: process_one_work (kernel/workqueue.c:3212) 
| [ 4326.037741][   T50]
| [ 4326.037741][   T50] stack backtrace:
[ 4326.037935][   T50] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 4326.037937][   T50] Workqueue: events xfrm_trans_reinject
[ 4326.037947][   T50] Call Trace:
[ 4326.037949][   T50]  <TASK>
[ 4326.037952][ T50] dump_stack_lvl (lib/dump_stack.c:123) 
[ 4326.037963][ T50] lockdep_rcu_suspicious (kernel/locking/lockdep.c:6848) 
[ 4326.037975][ T50] ip6_input (./include/net/net_namespace.h:404 ./include/linux/netdevice.h:2669 net/ipv6/ip6_input.c:490) 
[ 4326.037980][ T50] ? __pfx_ip6_input (net/ipv6/ip6_input.c:489) 
[ 4326.037982][ T50] ? 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) 
[ 4326.037986][ T50] ? mark_lock (kernel/locking/lockdep.c:4729 (discriminator 3)) 
[ 4326.037994][ T50] ? mark_held_locks (kernel/locking/lockdep.c:4323) 
[ 4326.038004][ T50] ? __pfx_ip6_rcv_finish (net/ipv6/ip6_input.c:70) 
[ 4326.038009][ T50] xfrm_trans_reinject (net/xfrm/xfrm_input.c:787) 
[ 4326.038013][ T50] ? lock_acquire.part.0 (kernel/locking/lockdep.c:469 kernel/locking/lockdep.c:5853) 
[ 4326.038020][ T50] ? __pfx_xfrm_trans_reinject (net/xfrm/xfrm_input.c:775) 
[ 4326.038027][ T50] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5816) 
[ 4326.038033][ T50] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 21)) 
[ 4326.038035][ T50] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 21)) 
[ 4326.038042][ T50] ? lock_acquire (kernel/locking/lockdep.c:5824) 
[ 4326.038045][ T50] ? process_one_work (kernel/workqueue.c:3212) 
[ 4326.038055][ T50] process_one_work (kernel/workqueue.c:3236) 
[ 4326.038068][ T50] ? __pfx___lock_release (kernel/locking/lockdep.c:5503) 
[ 4326.038073][ T50] ? __pfx_process_one_work (kernel/workqueue.c:3138) 
[ 4326.038086][ T50] ? assign_work (kernel/workqueue.c:1200) 
[ 4326.038098][ T50] worker_thread (kernel/workqueue.c:3311 kernel/workqueue.c:3398) 
[ 4326.038103][ T50] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4349 kernel/locking/lockdep.c:4408) 
[ 4326.038115][ T50] ? __pfx_worker_thread (kernel/workqueue.c:3344) 
[ 4326.038121][ T50] kthread (kernel/kthread.c:464) 
[ 4326.038127][ T50] ? __pfx_kthread (kernel/kthread.c:413) 
[ 4326.038136][ T50] ? __pfx_kthread (kernel/kthread.c:413) 
[ 4326.038141][ T50] ret_from_fork (arch/x86/kernel/process.c:148) 
[ 4326.038147][ T50] ? __pfx_kthread (kernel/kthread.c:413) 


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