====================================== | [ 31.963241][ T10] ret_from_fork_asm (arch/x86/entry/entry_64.S:256) | [ 31.963375][ T10] | [ 31.963518][ T10] | [ 31.963518][ T10] stack backtrace: [ 31.963879][ T10] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014 [ 31.964266][ T10] Workqueue: ipv6_addrconf addrconf_dad_work [ 31.964455][ T10] Call Trace: [ 31.964569][ T10] [ 31.964646][ T10] dump_stack_lvl (lib/dump_stack.c:117) [ 31.964787][ T10] print_bad_irq_dependency (kernel/locking/lockdep.c:2626) [ 31.964926][ T10] ? __pfx_validate_chain (kernel/locking/lockdep.c:3825) [ 31.965060][ T10] ? __pfx_print_bad_irq_dependency (kernel/locking/lockdep.c:2569) [ 31.965237][ T10] ? __pfx_usage_skip (kernel/locking/lockdep.c:2264) [ 31.965374][ T10] ? __bfs (kernel/locking/lockdep.c:1787) [ 31.965473][ T10] ? __pfx_usage_match (kernel/locking/lockdep.c:2256) [ 31.965614][ T10] check_irq_usage (kernel/locking/lockdep.c:2871) [ 31.965761][ T10] ? __pfx_check_irq_usage (kernel/locking/lockdep.c:2790) [ 31.965906][ T10] ? __bfs (kernel/locking/lockdep.c:1787) [ 31.966004][ T10] ? __pfx_hlock_conflict (kernel/locking/lockdep.c:2016) [ 31.966136][ T10] ? check_path.constprop.0 (kernel/locking/lockdep.c:2145) [ 31.966284][ T10] ? check_noncircular (kernel/locking/lockdep.c:2172) [ 31.966416][ T10] ? __pfx_check_noncircular (kernel/locking/lockdep.c:2163) [ 31.966713][ T10] ? check_prev_add (kernel/locking/lockdep.c:3138) [ 31.966850][ T10] check_prev_add (kernel/locking/lockdep.c:3138) [ 31.966997][ T10] ? validate_chain (./include/linux/hash.h:78 kernel/locking/lockdep.c:3759 kernel/locking/lockdep.c:3782 kernel/locking/lockdep.c:3837) [ 31.967129][ T10] validate_chain (kernel/locking/lockdep.c:3254 kernel/locking/lockdep.c:3869) [ 31.967266][ T10] ? mark_lock (kernel/locking/lockdep.c:4656 (discriminator 3)) [ 31.967449][ T10] ? __pfx_validate_chain (kernel/locking/lockdep.c:3825) [ 31.967583][ T10] ? 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) [ 31.967715][ T10] ? mark_lock (kernel/locking/lockdep.c:4656 (discriminator 3)) [ 31.967816][ T10] __lock_acquire (kernel/locking/lockdep.c:5137) [ 31.968030][ T10] lock_acquire.part.0 (kernel/locking/lockdep.c:467 kernel/locking/lockdep.c:5756) [ 31.968162][ T10] ? __get_task_comm (fs/exec.c:1234) [ 31.968297][ T10] ? mark_lock (kernel/locking/lockdep.c:4656 (discriminator 3)) [ 31.968406][ T10] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5719) [ 31.968556][ T10] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 52)) [ 31.968768][ T10] ? __get_task_comm (fs/exec.c:1234) [ 31.968897][ T10] ? lock_acquire (kernel/locking/lockdep.c:5727) [ 31.969027][ T10] ? __get_task_comm (fs/exec.c:1234) [ 31.969157][ T10] _raw_spin_lock (./include/linux/spinlock_api_smp.h:134 kernel/locking/spinlock.c:154) [ 31.969367][ T10] ? __get_task_comm (fs/exec.c:1234) [ 31.969497][ T10] __get_task_comm (fs/exec.c:1234) [ 31.969638][ T10] ref_tracker_alloc (lib/ref_tracker.c:217) [ 31.969775][ T10] ? __pfx_ref_tracker_alloc (lib/ref_tracker.c:193) [ 31.969990][ T10] ? dev_get_by_index (./include/linux/rcupdate.h:339 ./include/linux/rcupdate.h:814 net/core/dev.c:888) [ 31.970119][ T10] ? netdev_get_by_index (net/core/dev.c:914) [ 31.970251][ T10] ? fib6_nh_init (net/ipv6/route.c:3541) [ 31.970397][ T10] ? ip6_route_info_create (net/ipv6/route.c:3808) [ 31.970529][ T10] ? addrconf_f6i_alloc (net/ipv6/route.c:4584) [ 31.970745][ T10] ? __ipv6_dev_ac_inc (net/ipv6/anycast.c:309) [ 31.970878][ T10] ? addrconf_join_anycast (net/ipv6/addrconf.c:2264) [ 31.971025][ T10] ? __ipv6_ifa_notify (net/ipv6/addrconf.c:6273) [ 31.971155][ T10] ? addrconf_dad_completed (net/ipv6/addrconf.c:4324) [ 31.971367][ T10] ? addrconf_dad_work (net/ipv6/addrconf.c:4268) [ 31.971503][ T10] ? process_one_work (kernel/workqueue.c:3254) [ 31.971640][ T10] ? worker_thread (kernel/workqueue.c:3329 kernel/workqueue.c:3416) [ 31.971781][ T10] ? kthread (kernel/kthread.c:388) [ 31.971962][ T10] ? ret_from_fork (arch/x86/kernel/process.c:147) [ 31.972104][ T10] ? ret_from_fork_asm (arch/x86/entry/entry_64.S:256) [ 31.972240][ T10] ? dev_get_by_index (./include/linux/rcupdate.h:339 ./include/linux/rcupdate.h:814 net/core/dev.c:888) [ 31.972372][ T10] netdev_get_by_index (net/core/dev.c:914) [ 31.972534][ T10] fib6_nh_init (net/ipv6/route.c:3541) [ 31.972753][ T10] ? lockdep_hardirqs_on_prepare.part.0 (kernel/locking/lockdep.c:4292 kernel/locking/lockdep.c:4359) [ 31.972915][ T10] ? __pfx_fib6_nh_init (net/ipv6/route.c:3522) [ 31.973054][ T10] ? kasan_save_track (./arch/x86/include/asm/current.h:49 mm/kasan/common.c:60 mm/kasan/common.c:69) [ 31.973186][ T10] ? __kasan_kmalloc (mm/kasan/common.c:391) [ 31.973405][ T10] ? __kmalloc (mm/slub.c:3980) [ 31.973540][ T10] ? fib6_get_table (net/ipv6/ip6_fib.c:295) [ 31.973676][ T10] ip6_route_info_create (net/ipv6/route.c:3808) [ 31.973806][ T10] ? __lock_release (kernel/locking/lockdep.c:5430) [ 31.974015][ T10] ? __pfx_ip6_route_info_create (net/ipv6/route.c:3691) [ 31.974178][ T10] ? addrconf_f6i_alloc (./include/linux/rcupdate.h:339 ./include/linux/rcupdate.h:814 ./include/net/l3mdev.h:138 net/ipv6/route.c:4564) [ 31.974313][ T10] addrconf_f6i_alloc (net/ipv6/route.c:4584) [ 31.974447][ T10] ? __pfx_addrconf_f6i_alloc (net/ipv6/route.c:4562) [ 31.974659][ T10] ? 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) [ 31.974794][ T10] ? __pfx_do_raw_write_lock (kernel/locking/spinlock_debug.c:209) [ 31.974923][ T10] ? lock_acquire (kernel/locking/lockdep.c:5727) [ 31.975057][ T10] __ipv6_dev_ac_inc (net/ipv6/anycast.c:309) [ 31.975266][ T10] ? mark_held_locks (kernel/locking/lockdep.c:4274) [ 31.975401][ T10] addrconf_join_anycast (net/ipv6/addrconf.c:2264) [ 31.975541][ T10] ? ip6_ins_rt (net/ipv6/route.c:1320) [ 31.975672][ T10] ? __pfx_addrconf_join_anycast (net/ipv6/addrconf.c:2256) [ 31.975922][ T10] __ipv6_ifa_notify (net/ipv6/addrconf.c:6273) [ 31.976060][ T10] ? __pfx___ipv6_ifa_notify (net/ipv6/addrconf.c:6247) [ 31.976192][ T10] ? __pfx___cancel_work (kernel/workqueue.c:4273) [ 31.976334][ T10] ? find_held_lock (kernel/locking/lockdep.c:5244) [ 31.976570][ T10] ? addrconf_dad_completed (net/ipv6/addrconf.c:4324) [ 31.976702][ T10] addrconf_dad_completed (net/ipv6/addrconf.c:4324) [ 31.976832][ T10] ? 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) [ 31.976962][ T10] ? __pfx_addrconf_dad_completed (net/ipv6/addrconf.c:4307) [ 31.977280][ T10] ? mark_held_locks (kernel/locking/lockdep.c:4274) [ 31.977428][ T10] ? addrconf_dad_work (net/ipv6/addrconf.c:4268) [ 31.977557][ T10] addrconf_dad_work (net/ipv6/addrconf.c:4268) [ 31.977697][ T10] ? __pfx_addrconf_dad_work (net/ipv6/addrconf.c:4178) [ 31.977827][ T10] ? process_one_work (kernel/workqueue.c:3230) [ 31.978046][ T10] ? lock_acquire (kernel/locking/lockdep.c:5727) [ 31.978178][ T10] ? process_one_work (kernel/workqueue.c:3230) [ 31.978317][ T10] process_one_work (kernel/workqueue.c:3254) [ 31.978457][ T10] ? __pfx___lock_release (kernel/locking/lockdep.c:5406) [ 31.978666][ T10] ? __pfx_process_one_work (kernel/workqueue.c:3156) [ 31.978799][ T10] ? assign_work (kernel/workqueue.c:1209) [ 31.978939][ T10] worker_thread (kernel/workqueue.c:3329 kernel/workqueue.c:3416) [ 31.979073][ T10] ? __pfx_worker_thread (kernel/workqueue.c:3362) [ 31.979278][ T10] kthread (kernel/kthread.c:388) [ 31.979389][ T10] ? __pfx_kthread (kernel/kthread.c:341) [ 31.979519][ T10] ret_from_fork (arch/x86/kernel/process.c:147) [ 31.979652][ T10] ? __pfx_kthread (kernel/kthread.c:341) Finger prints: ret_from_fork_asm:dump_stack_lvl:print_bad_irq_dependency:check_irq_usage