====================================== | [ 78.782015][ T72] ret_from_fork_asm (arch/x86/entry/entry_64.S:256) | [ 78.782239][ T72] | [ 78.782313][ T72] | [ 78.782313][ T72] stack backtrace: [ 78.782704][ T72] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014 [ 78.783101][ T72] Workqueue: ipv6_addrconf addrconf_dad_work [ 78.783285][ T72] Call Trace: [ 78.783393][ T72] [ 78.783472][ T72] dump_stack_lvl (lib/dump_stack.c:117) [ 78.783698][ T72] print_bad_irq_dependency (kernel/locking/lockdep.c:2626) [ 78.783838][ T72] ? __pfx_validate_chain (kernel/locking/lockdep.c:3825) [ 78.783985][ T72] ? __pfx_print_bad_irq_dependency (kernel/locking/lockdep.c:2569) [ 78.784163][ T72] ? __pfx_usage_skip (kernel/locking/lockdep.c:2264) [ 78.784462][ T72] ? __bfs (kernel/locking/lockdep.c:1787) [ 78.784562][ T72] ? __pfx_usage_match (kernel/locking/lockdep.c:2256) [ 78.784706][ T72] check_irq_usage (kernel/locking/lockdep.c:2871) [ 78.784853][ T72] ? __pfx_check_irq_usage (kernel/locking/lockdep.c:2790) [ 78.785077][ T72] ? __bfs (kernel/locking/lockdep.c:1787) [ 78.785185][ T72] ? __pfx_hlock_conflict (kernel/locking/lockdep.c:2016) [ 78.785333][ T72] ? check_path.constprop.0 (kernel/locking/lockdep.c:2145) [ 78.785477][ T72] ? check_noncircular (kernel/locking/lockdep.c:2172) [ 78.785625][ T72] ? __pfx_check_noncircular (kernel/locking/lockdep.c:2163) [ 78.785850][ T72] ? check_prev_add (kernel/locking/lockdep.c:3138) [ 78.785995][ T72] check_prev_add (kernel/locking/lockdep.c:3138) [ 78.786145][ T72] ? validate_chain (./include/linux/hash.h:78 kernel/locking/lockdep.c:3759 kernel/locking/lockdep.c:3782 kernel/locking/lockdep.c:3837) [ 78.786289][ T72] validate_chain (kernel/locking/lockdep.c:3254 kernel/locking/lockdep.c:3869) [ 78.786513][ T72] ? mark_lock (kernel/locking/lockdep.c:4656 (discriminator 3)) [ 78.786623][ T72] ? __pfx_validate_chain (kernel/locking/lockdep.c:3825) [ 78.786770][ 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) [ 78.786915][ T72] ? mark_lock (kernel/locking/lockdep.c:4656 (discriminator 3)) [ 78.787023][ T72] __lock_acquire (kernel/locking/lockdep.c:5137) [ 78.787246][ T72] lock_acquire.part.0 (kernel/locking/lockdep.c:467 kernel/locking/lockdep.c:5756) [ 78.787388][ T72] ? __get_task_comm (fs/exec.c:1234) [ 78.787538][ T72] ? mark_lock (kernel/locking/lockdep.c:4656 (discriminator 3)) [ 78.787649][ T72] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5719) [ 78.787871][ T72] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 52)) [ 78.788017][ T72] ? __get_task_comm (fs/exec.c:1234) [ 78.788159][ T72] ? lock_acquire (kernel/locking/lockdep.c:5727) [ 78.788304][ T72] ? __get_task_comm (fs/exec.c:1234) [ 78.788450][ T72] _raw_spin_lock (./include/linux/spinlock_api_smp.h:134 kernel/locking/spinlock.c:154) [ 78.788670][ T72] ? __get_task_comm (fs/exec.c:1234) [ 78.788815][ T72] __get_task_comm (fs/exec.c:1234) [ 78.788964][ T72] ref_tracker_alloc (lib/ref_tracker.c:217) [ 78.789109][ T72] ? __pfx_ref_tracker_alloc (lib/ref_tracker.c:193) [ 78.789327][ T72] ? dev_get_by_index (./include/linux/rcupdate.h:339 ./include/linux/rcupdate.h:814 net/core/dev.c:888) [ 78.789471][ T72] ? netdev_get_by_index (net/core/dev.c:914) [ 78.789615][ T72] ? fib6_nh_init (net/ipv6/route.c:3541) [ 78.789759][ T72] ? ip6_route_info_create (net/ipv6/route.c:3808) [ 78.789980][ T72] ? addrconf_f6i_alloc (net/ipv6/route.c:4584) [ 78.790130][ T72] ? __ipv6_dev_ac_inc (net/ipv6/anycast.c:309) [ 78.790277][ T72] ? addrconf_join_anycast (net/ipv6/addrconf.c:2264) [ 78.790421][ T72] ? __ipv6_ifa_notify (net/ipv6/addrconf.c:6273) [ 78.790566][ T72] ? addrconf_dad_completed (net/ipv6/addrconf.c:4324) [ 78.790711][ T72] ? addrconf_dad_begin (net/ipv6/addrconf.c:4094) [ 78.790853][ T72] ? 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) [ 78.790984][ T72] ? process_one_work (kernel/workqueue.c:3254) [ 78.791117][ T72] ? worker_thread (kernel/workqueue.c:3329 kernel/workqueue.c:3416) [ 78.791251][ T72] ? kthread (kernel/kthread.c:388) [ 78.791355][ T72] ? ret_from_fork (arch/x86/kernel/process.c:147) [ 78.791486][ T72] ? ret_from_fork_asm (arch/x86/entry/entry_64.S:256) [ 78.791622][ T72] ? dev_get_by_index (./include/linux/rcupdate.h:339 ./include/linux/rcupdate.h:814 net/core/dev.c:888) [ 78.791832][ T72] netdev_get_by_index (net/core/dev.c:914) [ 78.791964][ T72] fib6_nh_init (net/ipv6/route.c:3541) [ 78.792095][ T72] ? lockdep_hardirqs_on_prepare.part.0 (kernel/locking/lockdep.c:4292 kernel/locking/lockdep.c:4359) [ 78.792258][ T72] ? __pfx_fib6_nh_init (net/ipv6/route.c:3522) [ 78.792473][ T72] ? kasan_save_track (./arch/x86/include/asm/current.h:49 mm/kasan/common.c:60 mm/kasan/common.c:69) [ 78.792607][ T72] ? __kasan_kmalloc (mm/kasan/common.c:391) [ 78.792739][ T72] ? __kmalloc (mm/slub.c:3980) [ 78.792871][ T72] ? fib6_get_table (net/ipv6/ip6_fib.c:295) [ 78.793080][ T72] ip6_route_info_create (net/ipv6/route.c:3808) [ 78.793212][ T72] ? __lock_release (kernel/locking/lockdep.c:5430) [ 78.793352][ T72] ? __pfx_ip6_route_info_create (net/ipv6/route.c:3691) [ 78.793530][ T72] ? addrconf_f6i_alloc (./include/linux/rcupdate.h:339 ./include/linux/rcupdate.h:814 ./include/net/l3mdev.h:138 net/ipv6/route.c:4564) [ 78.793751][ T72] addrconf_f6i_alloc (net/ipv6/route.c:4584) [ 78.793899][ T72] ? __pfx_addrconf_f6i_alloc (net/ipv6/route.c:4562) [ 78.794036][ 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) [ 78.794168][ T72] ? __pfx_do_raw_write_lock (kernel/locking/spinlock_debug.c:209) [ 78.794303][ T72] ? lock_acquire (kernel/locking/lockdep.c:5727) [ 78.794513][ T72] __ipv6_dev_ac_inc (net/ipv6/anycast.c:309) [ 78.794644][ T72] ? mark_held_locks (kernel/locking/lockdep.c:4274) [ 78.794777][ T72] addrconf_join_anycast (net/ipv6/addrconf.c:2264) [ 78.794909][ T72] ? ip6_ins_rt (net/ipv6/route.c:1320) [ 78.795196][ T72] ? __pfx_addrconf_join_anycast (net/ipv6/addrconf.c:2256) [ 78.795367][ T72] __ipv6_ifa_notify (net/ipv6/addrconf.c:6273) [ 78.795499][ T72] ? __pfx___ipv6_ifa_notify (net/ipv6/addrconf.c:6247) [ 78.795631][ T72] ? __pfx___cancel_work (kernel/workqueue.c:4273) [ 78.795841][ T72] ? find_held_lock (kernel/locking/lockdep.c:5244) [ 78.795973][ T72] ? addrconf_dad_completed (net/ipv6/addrconf.c:4324) [ 78.796103][ T72] addrconf_dad_completed (net/ipv6/addrconf.c:4324) [ 78.796237][ 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) [ 78.796450][ T72] ? __pfx_addrconf_dad_completed (net/ipv6/addrconf.c:4307) [ 78.796614][ T72] ? mark_held_locks (kernel/locking/lockdep.c:4274) [ 78.796748][ T72] ? addrconf_dad_begin (net/ipv6/addrconf.c:4094) [ 78.796879][ T72] addrconf_dad_begin (net/ipv6/addrconf.c:4094) [ 78.797086][ 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) [ 78.797217][ T72] ? __pfx_addrconf_dad_begin (net/ipv6/addrconf.c:4094) [ 78.797351][ T72] ? lockdep_hardirqs_on_prepare.part.0 (kernel/locking/lockdep.c:4300 kernel/locking/lockdep.c:4359) [ 78.797519][ T72] 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) [ 78.797725][ T72] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5719) [ 78.797857][ T72] ? __pfx_addrconf_dad_work (net/ipv6/addrconf.c:4178) [ 78.797988][ T72] ? process_one_work (kernel/workqueue.c:3230) [ 78.798119][ T72] ? lock_acquire (kernel/locking/lockdep.c:5727) [ 78.798325][ T72] ? process_one_work (kernel/workqueue.c:3230) [ 78.798458][ T72] process_one_work (kernel/workqueue.c:3254) [ 78.798591][ T72] ? __pfx___lock_release (kernel/locking/lockdep.c:5406) [ 78.798727][ T72] ? __pfx_process_one_work (kernel/workqueue.c:3156) [ 78.798861][ T72] ? assign_work (kernel/workqueue.c:1209) [ 78.799081][ T72] worker_thread (kernel/workqueue.c:3329 kernel/workqueue.c:3416) [ 78.799216][ T72] ? lockdep_hardirqs_on_prepare.part.0 (kernel/locking/lockdep.c:4300 kernel/locking/lockdep.c:4359) [ 78.799392][ T72] ? __pfx_worker_thread (kernel/workqueue.c:3362) [ 78.799538][ T72] ? __pfx_worker_thread (kernel/workqueue.c:3362) [ 78.799682][ T72] kthread (kernel/kthread.c:388) [ 78.799795][ T72] ? __pfx_kthread (kernel/kthread.c:341) [ 78.799936][ T72] ret_from_fork (arch/x86/kernel/process.c:147) [ 78.800073][ T72] ? __pfx_kthread (kernel/kthread.c:341) Finger prints: ret_from_fork_asm:dump_stack_lvl:print_bad_irq_dependency:check_irq_usage