======================================
| [ 33.345395][ C0] ret_from_fork_asm (arch/x86/entry/entry_64.S:256)
| [ 33.345550][ C0]
| [ 33.345627][ C0]
| [ 33.345627][ C0] stack backtrace:
[ 33.346154][ C0] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[ 33.346501][ C0] Workqueue: ipv6_addrconf addrconf_dad_work
[ 33.346900][ C0] Call Trace:
[ 33.347024][ C0]
[ 33.347105][ C0] dump_stack_lvl (lib/dump_stack.c:117)
[ 33.347263][ C0] print_irq_inversion_bug.part.0 (kernel/locking/lockdep.c:4024)
[ 33.347457][ C0] ? ret_from_fork_asm (arch/x86/entry/entry_64.S:256)
[ 33.347712][ C0] ? __pfx_print_irq_inversion_bug.part.0 (kernel/locking/lockdep.c:4024)
[ 33.347907][ C0] ? __pfx_usage_skip (kernel/locking/lockdep.c:2264)
[ 33.348070][ C0] ? __pfx_usage_match (kernel/locking/lockdep.c:2256)
[ 33.348224][ C0] ? arch_stack_walk (arch/x86/kernel/stacktrace.c:24)
[ 33.348514][ C0] mark_lock_irq (kernel/locking/lockdep.c:4244)
[ 33.348671][ C0] ? __pfx_mark_lock_irq (kernel/locking/lockdep.c:4207)
[ 33.348825][ C0] ? stack_trace_save (kernel/stacktrace.c:123)
[ 33.348982][ C0] ? save_trace (kernel/locking/lockdep.c:586)
[ 33.349141][ C0] mark_lock (kernel/locking/lockdep.c:4678)
[ 33.349259][ C0] mark_usage (kernel/locking/lockdep.c:4567)
[ 33.349380][ C0] __lock_acquire (kernel/locking/lockdep.c:5091)
[ 33.349537][ C0] lock_acquire.part.0 (kernel/locking/lockdep.c:467 kernel/locking/lockdep.c:5756)
[ 33.349693][ C0] ? ipv6_get_lladdr (net/ipv6/addrconf.c:1911 net/ipv6/addrconf.c:1934)
[ 33.349847][ C0] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5719)
[ 33.350002][ C0] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 52))
[ 33.350159][ C0] ? ipv6_get_lladdr (net/ipv6/addrconf.c:1911 net/ipv6/addrconf.c:1934)
[ 33.350313][ C0] ? lock_acquire (kernel/locking/lockdep.c:5727)
[ 33.350567][ C0] ? ipv6_get_lladdr (net/ipv6/addrconf.c:1911 net/ipv6/addrconf.c:1934)
[ 33.350723][ C0] _raw_read_lock_bh (./include/linux/rwlock_api_smp.h:177 kernel/locking/spinlock.c:252)
[ 33.350878][ C0] ? ipv6_get_lladdr (net/ipv6/addrconf.c:1911 net/ipv6/addrconf.c:1934)
[ 33.351032][ C0] ipv6_get_lladdr (net/ipv6/addrconf.c:1911 net/ipv6/addrconf.c:1934)
[ 33.351286][ C0] ndisc_send_ns (net/ipv6/ndisc.c:658)
[ 33.351441][ C0] ? __pfx_ndisc_send_ns (net/ipv6/ndisc.c:653)
[ 33.351596][ C0] ? __ipv6_chk_addr_and_flags (net/ipv6/addrconf.c:2009)
[ 33.351791][ C0] ndisc_solicit (net/ipv6/ndisc.c:736)
[ 33.352050][ C0] ? __pfx_ndisc_solicit (net/ipv6/ndisc.c:736)
[ 33.352206][ C0] ? neigh_probe (net/core/neighbour.c:1074)
[ 33.352368][ C0] neigh_probe (net/core/neighbour.c:1075)
[ 33.352489][ C0] __neigh_event_send (net/core/neighbour.c:1242)
[ 33.352649][ C0] neigh_resolve_output (net/core/neighbour.c:1547)
[ 33.352903][ C0] ? __local_bh_enable_ip (./arch/x86/include/asm/irqflags.h:42 ./arch/x86/include/asm/irqflags.h:77 kernel/softirq.c:387)
[ 33.353057][ C0] ? ___neigh_create (net/core/neighbour.c:722 (discriminator 9))
[ 33.353213][ C0] ip6_finish_output2 (./include/net/neighbour.h:542 net/ipv6/ip6_output.c:137)
[ 33.353369][ C0] ip6_finish_output (net/ipv6/ip6_output.c:211 net/ipv6/ip6_output.c:222)
[ 33.353625][ C0] ip6_output (./include/linux/netfilter.h:303 net/ipv6/ip6_output.c:243)
[ 33.353746][ C0] ? __pfx_ip6_output (net/ipv6/ip6_output.c:230)
[ 33.353902][ C0] ? ip6_dst_mtu_maybe_forward.constprop.0 (./include/linux/rcupdate.h:339 ./include/linux/rcupdate.h:814 ./include/net/ip6_route.h:336)
[ 33.354096][ C0] ip6_forward (./include/net/dst.h:450 net/ipv6/ip6_output.c:472 ./include/linux/netfilter.h:314 ./include/linux/netfilter.h:308 net/ipv6/ip6_output.c:660)
[ 33.354348][ C0] ? ip6_route_input (./include/linux/skbuff.h:1163 net/ipv6/route.c:2594)
[ 33.354505][ C0] ? __pfx_ip6_forward (net/ipv6/ip6_output.c:494)
[ 33.354664][ C0] ? ip6_rcv_core (./include/linux/skbuff.h:3202 net/ipv6/ip6_input.c:291)
[ 33.354819][ C0] ? ipv6_rcv (./include/net/dst.h:460 ./include/net/dst.h:458 net/ipv6/ip6_input.c:79 ./include/linux/netfilter.h:314 ./include/linux/netfilter.h:308 net/ipv6/ip6_input.c:310)
[ 33.354935][ C0] ipv6_rcv (./include/net/dst.h:460 ./include/net/dst.h:458 net/ipv6/ip6_input.c:79 ./include/linux/netfilter.h:314 ./include/linux/netfilter.h:308 net/ipv6/ip6_input.c:310)
[ 33.355149][ C0] ? __pfx_ipv6_rcv (net/ipv6/ip6_input.c:304)
[ 33.355308][ C0] ? lock_acquire.part.0 (kernel/locking/lockdep.c:467 kernel/locking/lockdep.c:5756)
[ 33.355463][ C0] ? process_backlog (./include/linux/rcupdate.h:329 ./include/linux/rcupdate.h:781 net/core/dev.c:6046)
[ 33.355618][ C0] ? __pfx_ipv6_rcv (net/ipv6/ip6_input.c:304)
[ 33.355873][ C0] __netif_receive_skb_one_core (net/core/dev.c:5597)
[ 33.356073][ C0] ? __pfx___netif_receive_skb_one_core (net/core/dev.c:5597)
[ 33.356265][ C0] ? process_backlog (./include/linux/rcupdate.h:329 ./include/linux/rcupdate.h:781 net/core/dev.c:6046)
[ 33.356419][ C0] ? lock_acquire (kernel/locking/lockdep.c:5727)
[ 33.356672][ C0] ? process_backlog (./include/linux/rcupdate.h:329 ./include/linux/rcupdate.h:781 net/core/dev.c:6046)
[ 33.356831][ C0] process_backlog (./include/linux/rcupdate.h:810 net/core/dev.c:6048)
[ 33.356988][ C0] ? find_held_lock (kernel/locking/lockdep.c:5244)
[ 33.357143][ C0] __napi_poll.constprop.0 (net/core/dev.c:6701)
[ 33.357406][ C0] net_rx_action (net/core/dev.c:6770 net/core/dev.c:6886)
[ 33.357564][ C0] ? __pfx_net_rx_action (net/core/dev.c:6850)
[ 33.357719][ C0] ? usage_skip (kernel/locking/lockdep.c:2295 kernel/locking/lockdep.c:2263)
[ 33.357874][ C0] ? mark_held_locks (kernel/locking/lockdep.c:4274)
[ 33.358033][ C0] __do_softirq (kernel/softirq.c:554)
[ 33.358190][ C0] ? __dev_queue_xmit (./include/linux/rcupdate.h:339 ./include/linux/rcupdate.h:849 net/core/dev.c:4399)
[ 33.358356][ C0] do_softirq (kernel/softirq.c:455 kernel/softirq.c:442)
[ 33.358473][ C0]
[ 33.358553][ C0]
[ 33.358631][ C0] __local_bh_enable_ip (kernel/softirq.c:382)
[ 33.358885][ C0] ? __dev_queue_xmit (./include/linux/rcupdate.h:339 ./include/linux/rcupdate.h:849 net/core/dev.c:4399)
[ 33.359042][ C0] __dev_queue_xmit (net/core/dev.c:4400)
[ 33.359196][ C0] ? mark_lock (kernel/locking/lockdep.c:4656 (discriminator 3))
[ 33.359312][ C0] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 52))
[ 33.359566][ C0] ? mark_held_locks (kernel/locking/lockdep.c:4274)
[ 33.359724][ C0] ? eth_header (net/ethernet/eth.c:100)
[ 33.359879][ C0] ? __pfx___dev_queue_xmit (net/core/dev.c:4281)
[ 33.360034][ C0] ? neigh_resolve_output (./include/linux/netdevice.h:3146 net/core/neighbour.c:1558 net/core/neighbour.c:1543)
[ 33.360193][ C0] ip6_finish_output2 (./include/net/neighbour.h:542 net/ipv6/ip6_output.c:137)
[ 33.360456][ C0] ip6_finish_output (net/ipv6/ip6_output.c:211 net/ipv6/ip6_output.c:222)
[ 33.360611][ C0] ip6_output (./include/linux/netfilter.h:303 net/ipv6/ip6_output.c:243)
[ 33.360728][ C0] ? __pfx_ip6_output (net/ipv6/ip6_output.c:230)
[ 33.360885][ C0] ? lock_acquire.part.0 (kernel/locking/lockdep.c:467 kernel/locking/lockdep.c:5756)
[ 33.361045][ C0] ? find_held_lock (kernel/locking/lockdep.c:5244)
[ 33.361201][ C0] ? __lock_release (kernel/locking/lockdep.c:5430)
[ 33.361355][ C0] ? icmp6_dst_alloc (net/ipv6/route.c:3293)
[ 33.361511][ C0] NF_HOOK.constprop.0 (./include/linux/rcupdate.h:329 ./include/linux/rcupdate.h:781 ./include/linux/netfilter.h:238 ./include/linux/netfilter.h:312)
[ 33.361667][ C0] ? __pfx_NF_HOOK.constprop.0 (./include/linux/netfilter.h:308)
[ 33.361821][ C0] ? __pfx_xfrm_lookup_with_ifid (net/xfrm/xfrm_policy.c:3136)
[ 33.362015][ C0] ? lockdep_hardirqs_on_prepare.part.0 (kernel/locking/lockdep.c:4300 kernel/locking/lockdep.c:4359)
[ 33.362209][ C0] ? icmp6_dst_alloc (net/ipv6/route.c:3293)
[ 33.362481][ C0] ? __local_bh_enable_ip (./arch/x86/include/asm/irqflags.h:42 ./arch/x86/include/asm/irqflags.h:77 kernel/softirq.c:387)
[ 33.362636][ C0] mld_sendpack (net/ipv6/mcast.c:1822)
[ 33.362792][ C0] ? __pfx_mld_sendpack (net/ipv6/mcast.c:1779)
[ 33.362950][ C0] ipv6_mc_dad_complete (./include/linux/refcount.h:192 net/ipv6/mcast.c:2244)
[ 33.363106][ C0] addrconf_dad_completed (net/ipv6/addrconf.c:4341)
[ 33.363262][ C0] ? 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:228)
[ 33.363416][ C0] ? __pfx_addrconf_dad_completed (net/ipv6/addrconf.c:4307)
[ 33.363608][ C0] ? mark_held_locks (kernel/locking/lockdep.c:4274)
[ 33.363768][ C0] ? addrconf_dad_begin (net/ipv6/addrconf.c:4094)
[ 33.363921][ C0] addrconf_dad_begin (net/ipv6/addrconf.c:4094)
[ 33.364074][ C0] ? 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:228)
[ 33.364233][ C0] ? __pfx_addrconf_dad_begin (net/ipv6/addrconf.c:4094)
[ 33.364389][ C0] ? lockdep_hardirqs_on_prepare.part.0 (kernel/locking/lockdep.c:4300 kernel/locking/lockdep.c:4359)
[ 33.364683][ C0] addrconf_dad_work (./include/linux/instrumented.h:96 ./include/linux/atomic/atomic-instrumented.h:400 ./include/linux/refcount.h:264 ./include/linux/refcount.h:307 ./include/linux/refcount.h:325 ./include/net/addrconf.h:427 net/ipv6/addrconf.c:4283)
[ 33.364837][ C0] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5719)
[ 33.364993][ C0] ? __pfx_addrconf_dad_work (net/ipv6/addrconf.c:4178)
[ 33.365151][ C0] ? process_one_work (kernel/workqueue.c:3230)
[ 33.365313][ C0] ? lock_acquire (kernel/locking/lockdep.c:5727)
[ 33.365467][ C0] ? process_one_work (kernel/workqueue.c:3230)
[ 33.365622][ C0] process_one_work (kernel/workqueue.c:3254)
[ 33.365779][ C0] ? __pfx___lock_release (kernel/locking/lockdep.c:5406)
[ 33.366033][ C0] ? __pfx_process_one_work (kernel/workqueue.c:3156)
[ 33.366189][ C0] ? assign_work (kernel/workqueue.c:1209)
[ 33.366349][ C0] worker_thread (kernel/workqueue.c:3329 kernel/workqueue.c:3416)
[ 33.366508][ C0] ? __pfx_worker_thread (kernel/workqueue.c:3362)
[ 33.366762][ C0] kthread (kernel/kthread.c:388)
[ 33.366880][ C0] ? __pfx_kthread (kernel/kthread.c:341)
[ 33.367035][ C0] ret_from_fork (arch/x86/kernel/process.c:147)
[ 33.367190][ C0] ? __pfx_kthread (kernel/kthread.c:341)
Finger prints:
ret_from_fork_asm:dump_stack_lvl:mark_lock_irq:mark_lock