====================================== | [ 31.647439][ T72] ret_from_fork_asm (arch/x86/entry/entry_64.S:256) | [ 31.647568][ T72] | [ 31.647635][ T72] | [ 31.647635][ T72] stack backtrace: [ 31.647992][ T72] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014 [ 31.648433][ T72] Workqueue: ipv6_addrconf addrconf_dad_work [ 31.648600][ T72] Call Trace: [ 31.648700][ T72] [ 31.648770][ T72] dump_stack_lvl (lib/dump_stack.c:117) [ 31.648903][ T72] print_bad_irq_dependency (kernel/locking/lockdep.c:2626) [ 31.649111][ T72] ? __pfx_validate_chain (kernel/locking/lockdep.c:3825) [ 31.649243][ T72] ? __pfx_print_bad_irq_dependency (kernel/locking/lockdep.c:2569) [ 31.649404][ T72] ? __pfx_usage_skip (kernel/locking/lockdep.c:2264) [ 31.649536][ T72] ? __bfs (kernel/locking/lockdep.c:1787) [ 31.649714][ T72] ? __pfx_usage_match (kernel/locking/lockdep.c:2256) [ 31.649844][ T72] check_irq_usage (kernel/locking/lockdep.c:2871) [ 31.649976][ T72] ? __pfx_check_irq_usage (kernel/locking/lockdep.c:2790) [ 31.650107][ T72] ? __bfs (kernel/locking/lockdep.c:1787) [ 31.650205][ T72] ? __pfx_hlock_conflict (kernel/locking/lockdep.c:2016) [ 31.650413][ T72] ? check_path.constprop.0 (kernel/locking/lockdep.c:2145) [ 31.650542][ T72] ? check_noncircular (kernel/locking/lockdep.c:2172) [ 31.650678][ T72] ? __pfx_check_noncircular (kernel/locking/lockdep.c:2163) [ 31.650812][ T72] ? check_prev_add (kernel/locking/lockdep.c:3138) [ 31.651018][ T72] check_prev_add (kernel/locking/lockdep.c:3138) [ 31.651149][ T72] ? validate_chain (./include/linux/hash.h:78 kernel/locking/lockdep.c:3759 kernel/locking/lockdep.c:3782 kernel/locking/lockdep.c:3837) [ 31.651279][ T72] validate_chain (kernel/locking/lockdep.c:3254 kernel/locking/lockdep.c:3869) [ 31.651411][ T72] ? mark_lock (kernel/locking/lockdep.c:4656 (discriminator 3)) [ 31.651512][ T72] ? __pfx_validate_chain (kernel/locking/lockdep.c:3825) [ 31.651726][ 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) [ 31.651855][ T72] ? mark_lock (kernel/locking/lockdep.c:4656 (discriminator 3)) [ 31.651957][ T72] __lock_acquire (kernel/locking/lockdep.c:5137) [ 31.652092][ T72] lock_acquire.part.0 (kernel/locking/lockdep.c:467 kernel/locking/lockdep.c:5756) [ 31.652222][ T72] ? __get_task_comm (fs/exec.c:1234) [ 31.652352][ T72] ? mark_lock (kernel/locking/lockdep.c:4656 (discriminator 3)) [ 31.652455][ T72] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5719) [ 31.652586][ T72] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 52)) [ 31.652718][ T72] ? __get_task_comm (fs/exec.c:1234) [ 31.652848][ T72] ? lock_acquire (kernel/locking/lockdep.c:5727) [ 31.652979][ T72] ? __get_task_comm (fs/exec.c:1234) [ 31.653111][ T72] _raw_spin_lock (./include/linux/spinlock_api_smp.h:134 kernel/locking/spinlock.c:154) [ 31.653244][ T72] ? __get_task_comm (fs/exec.c:1234) [ 31.653451][ T72] __get_task_comm (fs/exec.c:1234) [ 31.653585][ T72] ref_tracker_alloc (lib/ref_tracker.c:217) [ 31.653717][ T72] ? __pfx_ref_tracker_alloc (lib/ref_tracker.c:193) [ 31.653846][ T72] ? dev_get_by_index (./include/linux/rcupdate.h:339 ./include/linux/rcupdate.h:814 net/core/dev.c:888) [ 31.654052][ T72] ? netdev_get_by_index (net/core/dev.c:914) [ 31.654181][ T72] ? fib6_nh_init (net/ipv6/route.c:3541) [ 31.654316][ T72] ? ip6_route_info_create (net/ipv6/route.c:3808) [ 31.654446][ T72] ? addrconf_f6i_alloc (net/ipv6/route.c:4584) [ 31.654652][ T72] ? __ipv6_dev_ac_inc (net/ipv6/anycast.c:309) [ 31.654789][ T72] ? addrconf_join_anycast (net/ipv6/addrconf.c:2264) [ 31.654927][ T72] ? __ipv6_ifa_notify (net/ipv6/addrconf.c:6273) [ 31.655057][ T72] ? addrconf_dad_completed (net/ipv6/addrconf.c:4324) [ 31.655190][ T72] ? addrconf_dad_work (net/ipv6/addrconf.c:4268) [ 31.655399][ T72] ? process_one_work (kernel/workqueue.c:3254) [ 31.655530][ T72] ? worker_thread (kernel/workqueue.c:3329 kernel/workqueue.c:3416) [ 31.655659][ T72] ? kthread (kernel/kthread.c:388) [ 31.655757][ T72] ? ret_from_fork (arch/x86/kernel/process.c:147) [ 31.655964][ T72] ? ret_from_fork_asm (arch/x86/entry/entry_64.S:256) [ 31.656097][ T72] ? dev_get_by_index (./include/linux/rcupdate.h:339 ./include/linux/rcupdate.h:814 net/core/dev.c:888) [ 31.656228][ T72] netdev_get_by_index (net/core/dev.c:914) [ 31.656358][ T72] fib6_nh_init (net/ipv6/route.c:3541) [ 31.656573][ T72] ? lockdep_hardirqs_on_prepare.part.0 (kernel/locking/lockdep.c:4292 kernel/locking/lockdep.c:4359) [ 31.656738][ T72] ? __pfx_fib6_nh_init (net/ipv6/route.c:3522) [ 31.656867][ T72] ? kasan_save_track (./arch/x86/include/asm/current.h:49 mm/kasan/common.c:60 mm/kasan/common.c:69) [ 31.657000][ T72] ? __kasan_kmalloc (mm/kasan/common.c:391) [ 31.657131][ T72] ? __kmalloc (mm/slub.c:3980) [ 31.657261][ T72] ? fib6_get_table (net/ipv6/ip6_fib.c:295) [ 31.657392][ T72] ip6_route_info_create (net/ipv6/route.c:3808) [ 31.657522][ T72] ? __lock_release (kernel/locking/lockdep.c:5430) [ 31.657654][ T72] ? __pfx_ip6_route_info_create (net/ipv6/route.c:3691) [ 31.657820][ T72] ? addrconf_f6i_alloc (./include/linux/rcupdate.h:339 ./include/linux/rcupdate.h:814 ./include/net/l3mdev.h:138 net/ipv6/route.c:4564) [ 31.657951][ T72] addrconf_f6i_alloc (net/ipv6/route.c:4584) [ 31.658083][ T72] ? __pfx_addrconf_f6i_alloc (net/ipv6/route.c:4562) [ 31.658218][ 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) [ 31.658500][ T72] ? __pfx_do_raw_write_lock (kernel/locking/spinlock_debug.c:209) [ 31.658630][ T72] ? lock_acquire (kernel/locking/lockdep.c:5727) [ 31.658762][ T72] __ipv6_dev_ac_inc (net/ipv6/anycast.c:309) [ 31.658894][ T72] ? mark_held_locks (kernel/locking/lockdep.c:4274) [ 31.659105][ T72] addrconf_join_anycast (net/ipv6/addrconf.c:2264) [ 31.659235][ T72] ? ip6_ins_rt (net/ipv6/route.c:1320) [ 31.659366][ T72] ? __pfx_addrconf_join_anycast (net/ipv6/addrconf.c:2256) [ 31.659529][ T72] __ipv6_ifa_notify (net/ipv6/addrconf.c:6273) [ 31.659736][ T72] ? __pfx___ipv6_ifa_notify (net/ipv6/addrconf.c:6247) [ 31.659870][ T72] ? __pfx___cancel_work (kernel/workqueue.c:4273) [ 31.660001][ T72] ? find_held_lock (kernel/locking/lockdep.c:5244) [ 31.660132][ T72] ? addrconf_dad_completed (net/ipv6/addrconf.c:4324) [ 31.660340][ T72] addrconf_dad_completed (net/ipv6/addrconf.c:4324) [ 31.660469][ 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) [ 31.660600][ T72] ? __pfx_addrconf_dad_completed (net/ipv6/addrconf.c:4307) [ 31.660767][ T72] ? mark_held_locks (kernel/locking/lockdep.c:4274) [ 31.660975][ T72] ? addrconf_dad_work (net/ipv6/addrconf.c:4268) [ 31.661103][ T72] addrconf_dad_work (net/ipv6/addrconf.c:4268) [ 31.661236][ T72] ? __pfx_addrconf_dad_work (net/ipv6/addrconf.c:4178) [ 31.661366][ T72] ? process_one_work (kernel/workqueue.c:3230) [ 31.661586][ T72] ? lock_acquire (kernel/locking/lockdep.c:5727) [ 31.661719][ T72] ? process_one_work (kernel/workqueue.c:3230) [ 31.661850][ T72] process_one_work (kernel/workqueue.c:3254) [ 31.661981][ T72] ? __pfx___lock_release (kernel/locking/lockdep.c:5406) [ 31.662112][ T72] ? __pfx_process_one_work (kernel/workqueue.c:3156) [ 31.662243][ T72] ? assign_work (kernel/workqueue.c:1209) [ 31.662375][ T72] worker_thread (kernel/workqueue.c:3329 kernel/workqueue.c:3416) [ 31.662506][ T72] ? lockdep_hardirqs_on_prepare.part.0 (kernel/locking/lockdep.c:4300 kernel/locking/lockdep.c:4359) [ 31.662671][ T72] ? __pfx_worker_thread (kernel/workqueue.c:3362) [ 31.662801][ T72] ? __pfx_worker_thread (kernel/workqueue.c:3362) [ 31.662931][ T72] kthread (kernel/kthread.c:388) [ 31.663030][ T72] ? __pfx_kthread (kernel/kthread.c:341) [ 31.663160][ T72] ret_from_fork (arch/x86/kernel/process.c:147) [ 31.663367][ T72] ? __pfx_kthread (kernel/kthread.c:341) Finger prints: ret_from_fork_asm:dump_stack_lvl:print_bad_irq_dependency:check_irq_usage