====================================== | [ 54.895347][ T72] ret_from_fork_asm (arch/x86/entry/entry_64.S:256) | [ 54.895510][ T72] | [ 54.895586][ T72] | [ 54.895586][ T72] stack backtrace: [ 54.896008][ T72] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014 [ 54.896344][ T72] Workqueue: ipv6_addrconf addrconf_dad_work [ 54.896589][ T72] Call Trace: [ 54.896703][ T72] [ 54.896775][ T72] dump_stack_lvl (lib/dump_stack.c:117) [ 54.896922][ T72] print_bad_irq_dependency (kernel/locking/lockdep.c:2626) [ 54.897076][ T72] ? __pfx_validate_chain (kernel/locking/lockdep.c:3825) [ 54.897226][ T72] ? __pfx_print_bad_irq_dependency (kernel/locking/lockdep.c:2569) [ 54.897436][ T72] ? __pfx_usage_skip (kernel/locking/lockdep.c:2264) [ 54.897589][ T72] ? __bfs (kernel/locking/lockdep.c:1787) [ 54.897720][ T72] ? __pfx_usage_match (kernel/locking/lockdep.c:2256) [ 54.897903][ T72] check_irq_usage (kernel/locking/lockdep.c:2871) [ 54.898094][ T72] ? __pfx_check_irq_usage (kernel/locking/lockdep.c:2790) [ 54.898318][ T72] ? __bfs (kernel/locking/lockdep.c:1787) [ 54.898439][ T72] ? __pfx_hlock_conflict (kernel/locking/lockdep.c:2016) [ 54.898597][ T72] ? check_path.constprop.0 (kernel/locking/lockdep.c:2145) [ 54.898737][ T72] ? check_noncircular (kernel/locking/lockdep.c:2172) [ 54.898900][ T72] ? __pfx_check_noncircular (kernel/locking/lockdep.c:2163) [ 54.899059][ T72] ? check_prev_add (kernel/locking/lockdep.c:3138) [ 54.899206][ T72] check_prev_add (kernel/locking/lockdep.c:3138) [ 54.899371][ T72] ? validate_chain (./include/linux/hash.h:78 kernel/locking/lockdep.c:3759 kernel/locking/lockdep.c:3782 kernel/locking/lockdep.c:3837) [ 54.899537][ T72] validate_chain (kernel/locking/lockdep.c:3254 kernel/locking/lockdep.c:3869) [ 54.899746][ T72] ? mark_lock (kernel/locking/lockdep.c:4656 (discriminator 3)) [ 54.899854][ T72] ? __pfx_validate_chain (kernel/locking/lockdep.c:3825) [ 54.900018][ T72] ? 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) [ 54.900164][ T72] ? mark_lock (kernel/locking/lockdep.c:4656 (discriminator 3)) [ 54.900271][ T72] __lock_acquire (kernel/locking/lockdep.c:5137) [ 54.900485][ T72] lock_acquire.part.0 (kernel/locking/lockdep.c:467 kernel/locking/lockdep.c:5756) [ 54.900626][ T72] ? __get_task_comm (fs/exec.c:1234) [ 54.900786][ T72] ? mark_lock (kernel/locking/lockdep.c:4656 (discriminator 3)) [ 54.900890][ T72] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5719) [ 54.901038][ T72] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 52)) [ 54.901200][ T72] ? __get_task_comm (fs/exec.c:1234) [ 54.901357][ T72] ? lock_acquire (kernel/locking/lockdep.c:5727) [ 54.901523][ T72] ? __get_task_comm (fs/exec.c:1234) [ 54.901668][ T72] _raw_spin_lock (./include/linux/spinlock_api_smp.h:134 kernel/locking/spinlock.c:154) [ 54.901820][ T72] ? __get_task_comm (fs/exec.c:1234) [ 54.901956][ T72] __get_task_comm (fs/exec.c:1234) [ 54.902114][ T72] ref_tracker_alloc (lib/ref_tracker.c:217) [ 54.902257][ T72] ? __pfx_ref_tracker_alloc (lib/ref_tracker.c:193) [ 54.902408][ T72] ? dev_get_by_index (./include/linux/rcupdate.h:339 ./include/linux/rcupdate.h:814 net/core/dev.c:888) [ 54.902560][ T72] ? netdev_get_by_index (net/core/dev.c:914) [ 54.902704][ T72] ? fib6_nh_init (net/ipv6/route.c:3541) [ 54.902854][ T72] ? ip6_route_info_create (net/ipv6/route.c:3808) [ 54.902995][ T72] ? addrconf_f6i_alloc (net/ipv6/route.c:4584) [ 54.903132][ T72] ? __ipv6_dev_ac_inc (net/ipv6/anycast.c:309) [ 54.903366][ T72] ? addrconf_join_anycast (net/ipv6/addrconf.c:2264) [ 54.903540][ T72] ? __ipv6_ifa_notify (net/ipv6/addrconf.c:6273) [ 54.903677][ T72] ? addrconf_dad_completed (net/ipv6/addrconf.c:4324) [ 54.903900][ T72] ? addrconf_dad_work (net/ipv6/addrconf.c:4268) [ 54.904034][ T72] ? process_one_work (kernel/workqueue.c:3254) [ 54.904182][ T72] ? worker_thread (kernel/workqueue.c:3329 kernel/workqueue.c:3416) [ 54.904318][ T72] ? kthread (kernel/kthread.c:388) [ 54.904444][ T72] ? ret_from_fork (arch/x86/kernel/process.c:147) [ 54.904678][ T72] ? ret_from_fork_asm (arch/x86/entry/entry_64.S:256) [ 54.904816][ T72] ? dev_get_by_index (./include/linux/rcupdate.h:339 ./include/linux/rcupdate.h:814 net/core/dev.c:888) [ 54.904950][ T72] netdev_get_by_index (net/core/dev.c:914) [ 54.905098][ T72] fib6_nh_init (net/ipv6/route.c:3541) [ 54.905315][ T72] ? lockdep_hardirqs_on_prepare.part.0 (kernel/locking/lockdep.c:4292 kernel/locking/lockdep.c:4359) [ 54.905553][ T72] ? __pfx_fib6_nh_init (net/ipv6/route.c:3522) [ 54.905691][ T72] ? kasan_save_track (./arch/x86/include/asm/current.h:49 mm/kasan/common.c:60 mm/kasan/common.c:69) [ 54.905832][ T72] ? __kasan_kmalloc (mm/kasan/common.c:391) [ 54.906055][ T72] ? __kmalloc (mm/slub.c:3980) [ 54.906192][ T72] ? fib6_get_table (net/ipv6/ip6_fib.c:295) [ 54.906327][ T72] ip6_route_info_create (net/ipv6/route.c:3808) [ 54.906548][ T72] ? __lock_release (kernel/locking/lockdep.c:5430) [ 54.906699][ T72] ? __pfx_ip6_route_info_create (net/ipv6/route.c:3691) [ 54.906867][ T72] ? addrconf_f6i_alloc (./include/linux/rcupdate.h:339 ./include/linux/rcupdate.h:814 ./include/net/l3mdev.h:138 net/ipv6/route.c:4564) [ 54.907001][ T72] addrconf_f6i_alloc (net/ipv6/route.c:4584) [ 54.907211][ T72] ? __pfx_addrconf_f6i_alloc (net/ipv6/route.c:4562) [ 54.907370][ T72] ? do_raw_write_lock (./arch/x86/include/asm/atomic.h:115 ./include/linux/atomic/atomic-arch-fallback.h:2170 ./include/linux/atomic/atomic-instrumented.h:1302 ./include/asm-generic/qrwlock.h:98 kernel/locking/spinlock_debug.c:211) [ 54.907519][ T72] ? __pfx_do_raw_write_lock (kernel/locking/spinlock_debug.c:209) [ 54.907668][ T72] ? lock_acquire (kernel/locking/lockdep.c:5727) [ 54.907806][ T72] __ipv6_dev_ac_inc (net/ipv6/anycast.c:309) [ 54.908044][ T72] ? mark_held_locks (kernel/locking/lockdep.c:4274) [ 54.908198][ T72] addrconf_join_anycast (net/ipv6/addrconf.c:2264) [ 54.908357][ T72] ? ip6_ins_rt (net/ipv6/route.c:1320) [ 54.908533][ T72] ? __pfx_addrconf_join_anycast (net/ipv6/addrconf.c:2256) [ 54.908796][ T72] __ipv6_ifa_notify (net/ipv6/addrconf.c:6273) [ 54.908937][ T72] ? __pfx___ipv6_ifa_notify (net/ipv6/addrconf.c:6247) [ 54.909095][ T72] ? __pfx___cancel_work (kernel/workqueue.c:4273) [ 54.909233][ T72] ? find_held_lock (kernel/locking/lockdep.c:5244) [ 54.909646][ T72] ? addrconf_dad_completed (net/ipv6/addrconf.c:4324) [ 54.909787][ T72] addrconf_dad_completed (net/ipv6/addrconf.c:4324) [ 54.909930][ T72] ? 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) [ 54.910077][ T72] ? __pfx_addrconf_dad_completed (net/ipv6/addrconf.c:4307) [ 54.910251][ T72] ? mark_held_locks (kernel/locking/lockdep.c:4274) [ 54.910411][ T72] ? addrconf_dad_work (net/ipv6/addrconf.c:4268) [ 54.910572][ T72] addrconf_dad_work (net/ipv6/addrconf.c:4268) [ 54.910717][ T72] ? __pfx_addrconf_dad_work (net/ipv6/addrconf.c:4178) [ 54.910855][ T72] ? process_one_work (kernel/workqueue.c:3230) [ 54.911011][ T72] ? lock_acquire (kernel/locking/lockdep.c:5727) [ 54.911164][ T72] ? process_one_work (kernel/workqueue.c:3230) [ 54.911320][ T72] process_one_work (kernel/workqueue.c:3254) [ 54.911482][ T72] ? __pfx___lock_release (kernel/locking/lockdep.c:5406) [ 54.911657][ T72] ? __pfx_process_one_work (kernel/workqueue.c:3156) [ 54.911807][ T72] ? assign_work (kernel/workqueue.c:1209) [ 54.911962][ T72] worker_thread (kernel/workqueue.c:3329 kernel/workqueue.c:3416) [ 54.912100][ T72] ? lockdep_hardirqs_on_prepare.part.0 (kernel/locking/lockdep.c:4300 kernel/locking/lockdep.c:4359) [ 54.912385][ T72] ? __pfx_worker_thread (kernel/workqueue.c:3362) [ 54.912556][ T72] ? __pfx_worker_thread (kernel/workqueue.c:3362) [ 54.912739][ T72] kthread (kernel/kthread.c:388) [ 54.912844][ T72] ? __pfx_kthread (kernel/kthread.c:341) [ 54.913092][ T72] ret_from_fork (arch/x86/kernel/process.c:147) [ 54.913253][ T72] ? __pfx_kthread (kernel/kthread.c:341) Finger prints: ret_from_fork_asm:dump_stack_lvl:print_bad_irq_dependency:check_irq_usage