====================================== | [ 44.900471][ T10] ret_from_fork_asm (arch/x86/entry/entry_64.S:256) | [ 44.900612][ T10] | [ 44.900687][ T10] | [ 44.900687][ T10] stack backtrace: [ 44.901168][ T10] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014 [ 44.901477][ T10] Workqueue: ipv6_addrconf addrconf_dad_work [ 44.901663][ T10] Call Trace: [ 44.901775][ T10] [ 44.901856][ T10] dump_stack_lvl (lib/dump_stack.c:117) [ 44.902101][ T10] print_bad_irq_dependency (kernel/locking/lockdep.c:2626) [ 44.902241][ T10] ? __pfx_validate_chain (kernel/locking/lockdep.c:3825) [ 44.902387][ T10] ? __pfx_print_bad_irq_dependency (kernel/locking/lockdep.c:2569) [ 44.902556][ T10] ? __pfx_usage_skip (kernel/locking/lockdep.c:2264) [ 44.902694][ T10] ? __bfs (kernel/locking/lockdep.c:1787) [ 44.902796][ T10] ? __pfx_usage_match (kernel/locking/lockdep.c:2256) [ 44.902935][ T10] check_irq_usage (kernel/locking/lockdep.c:2871) [ 44.903073][ T10] ? __pfx_check_irq_usage (kernel/locking/lockdep.c:2790) [ 44.903209][ T10] ? __bfs (kernel/locking/lockdep.c:1787) [ 44.903311][ T10] ? __pfx_hlock_conflict (kernel/locking/lockdep.c:2016) [ 44.903531][ T10] ? check_path.constprop.0 (kernel/locking/lockdep.c:2145) [ 44.903666][ T10] ? check_noncircular (kernel/locking/lockdep.c:2172) [ 44.903806][ T10] ? __pfx_check_noncircular (kernel/locking/lockdep.c:2163) [ 44.903943][ T10] ? check_prev_add (kernel/locking/lockdep.c:3138) [ 44.904075][ T10] check_prev_add (kernel/locking/lockdep.c:3138) [ 44.904377][ T10] ? validate_chain (./include/linux/hash.h:78 kernel/locking/lockdep.c:3759 kernel/locking/lockdep.c:3782 kernel/locking/lockdep.c:3837) [ 44.904512][ T10] validate_chain (kernel/locking/lockdep.c:3254 kernel/locking/lockdep.c:3869) [ 44.904734][ T10] ? mark_lock (kernel/locking/lockdep.c:4656 (discriminator 3)) [ 44.904842][ T10] ? __pfx_validate_chain (kernel/locking/lockdep.c:3825) [ 44.904978][ 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) [ 44.905205][ T10] ? mark_lock (kernel/locking/lockdep.c:4656 (discriminator 3)) [ 44.905310][ T10] __lock_acquire (kernel/locking/lockdep.c:5137) [ 44.905462][ T10] lock_acquire.part.0 (kernel/locking/lockdep.c:467 kernel/locking/lockdep.c:5756) [ 44.905598][ T10] ? __get_task_comm (fs/exec.c:1234) [ 44.905737][ T10] ? mark_lock (kernel/locking/lockdep.c:4656 (discriminator 3)) [ 44.905840][ T10] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5719) [ 44.906067][ T10] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 52)) [ 44.906204][ T10] ? __get_task_comm (fs/exec.c:1234) [ 44.906351][ T10] ? lock_acquire (kernel/locking/lockdep.c:5727) [ 44.906485][ T10] ? __get_task_comm (fs/exec.c:1234) [ 44.906621][ T10] _raw_spin_lock (./include/linux/spinlock_api_smp.h:134 kernel/locking/spinlock.c:154) [ 44.906757][ T10] ? __get_task_comm (fs/exec.c:1234) [ 44.906888][ T10] __get_task_comm (fs/exec.c:1234) [ 44.907025][ T10] ref_tracker_alloc (lib/ref_tracker.c:217) [ 44.907160][ T10] ? __pfx_ref_tracker_alloc (lib/ref_tracker.c:193) [ 44.907304][ T10] ? dev_get_by_index (./include/linux/rcupdate.h:339 ./include/linux/rcupdate.h:814 net/core/dev.c:888) [ 44.907439][ T10] ? netdev_get_by_index (net/core/dev.c:914) [ 44.907571][ T10] ? fib6_nh_init (net/ipv6/route.c:3541) [ 44.907705][ T10] ? ip6_route_info_create (net/ipv6/route.c:3808) [ 44.907844][ T10] ? addrconf_f6i_alloc (net/ipv6/route.c:4584) [ 44.907981][ T10] ? __ipv6_dev_ac_inc (net/ipv6/anycast.c:309) [ 44.908122][ T10] ? addrconf_join_anycast (net/ipv6/addrconf.c:2264) [ 44.908336][ T10] ? __ipv6_ifa_notify (net/ipv6/addrconf.c:6273) [ 44.908475][ T10] ? addrconf_dad_completed (net/ipv6/addrconf.c:4324) [ 44.908618][ T10] ? addrconf_dad_work (net/ipv6/addrconf.c:4268) [ 44.908760][ T10] ? process_one_work (kernel/workqueue.c:3254) [ 44.908980][ T10] ? worker_thread (kernel/workqueue.c:3329 kernel/workqueue.c:3416) [ 44.909117][ T10] ? kthread (kernel/kthread.c:388) [ 44.909222][ T10] ? ret_from_fork (arch/x86/kernel/process.c:147) [ 44.909360][ T10] ? ret_from_fork_asm (arch/x86/entry/entry_64.S:256) [ 44.909575][ T10] ? dev_get_by_index (./include/linux/rcupdate.h:339 ./include/linux/rcupdate.h:814 net/core/dev.c:888) [ 44.909717][ T10] netdev_get_by_index (net/core/dev.c:914) [ 44.909853][ T10] fib6_nh_init (net/ipv6/route.c:3541) [ 44.909991][ T10] ? lockdep_hardirqs_on_prepare.part.0 (kernel/locking/lockdep.c:4292 kernel/locking/lockdep.c:4359) [ 44.910238][ T10] ? __pfx_fib6_nh_init (net/ipv6/route.c:3522) [ 44.910373][ T10] ? kasan_save_track (./arch/x86/include/asm/current.h:49 mm/kasan/common.c:60 mm/kasan/common.c:69) [ 44.910508][ T10] ? __kasan_kmalloc (mm/kasan/common.c:391) [ 44.910640][ T10] ? __kmalloc (mm/slub.c:3980) [ 44.910786][ T10] ? fib6_get_table (net/ipv6/ip6_fib.c:295) [ 44.911011][ T10] ip6_route_info_create (net/ipv6/route.c:3808) [ 44.911155][ T10] ? __lock_release (kernel/locking/lockdep.c:5430) [ 44.911290][ T10] ? __pfx_ip6_route_info_create (net/ipv6/route.c:3691) [ 44.911457][ T10] ? addrconf_f6i_alloc (./include/linux/rcupdate.h:339 ./include/linux/rcupdate.h:814 ./include/net/l3mdev.h:138 net/ipv6/route.c:4564) [ 44.911751][ T10] addrconf_f6i_alloc (net/ipv6/route.c:4584) [ 44.911889][ T10] ? __pfx_addrconf_f6i_alloc (net/ipv6/route.c:4562) [ 44.912027][ 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) [ 44.912161][ T10] ? __pfx_do_raw_write_lock (kernel/locking/spinlock_debug.c:209) [ 44.912380][ T10] ? lock_acquire (kernel/locking/lockdep.c:5727) [ 44.912516][ T10] __ipv6_dev_ac_inc (net/ipv6/anycast.c:309) [ 44.912650][ T10] ? mark_held_locks (kernel/locking/lockdep.c:4274) [ 44.912788][ T10] addrconf_join_anycast (net/ipv6/addrconf.c:2264) [ 44.913023][ T10] ? ip6_ins_rt (net/ipv6/route.c:1320) [ 44.913156][ T10] ? __pfx_addrconf_join_anycast (net/ipv6/addrconf.c:2256) [ 44.913335][ T10] __ipv6_ifa_notify (net/ipv6/addrconf.c:6273) [ 44.913472][ T10] ? __pfx___ipv6_ifa_notify (net/ipv6/addrconf.c:6247) [ 44.913616][ T10] ? __pfx___cancel_work (kernel/workqueue.c:4273) [ 44.913750][ T10] ? find_held_lock (kernel/locking/lockdep.c:5244) [ 44.913884][ T10] ? addrconf_dad_completed (net/ipv6/addrconf.c:4324) [ 44.914022][ T10] addrconf_dad_completed (net/ipv6/addrconf.c:4324) [ 44.914153][ 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) [ 44.914293][ T10] ? __pfx_addrconf_dad_completed (net/ipv6/addrconf.c:4307) [ 44.914460][ T10] ? mark_held_locks (kernel/locking/lockdep.c:4274) [ 44.914595][ T10] ? addrconf_dad_work (net/ipv6/addrconf.c:4268) [ 44.914816][ T10] addrconf_dad_work (net/ipv6/addrconf.c:4268) [ 44.914952][ T10] ? __pfx_addrconf_dad_work (net/ipv6/addrconf.c:4178) [ 44.915086][ T10] ? process_one_work (kernel/workqueue.c:3230) [ 44.915222][ T10] ? lock_acquire (kernel/locking/lockdep.c:5727) [ 44.915352][ T10] ? process_one_work (kernel/workqueue.c:3230) [ 44.915566][ T10] process_one_work (kernel/workqueue.c:3254) [ 44.915704][ T10] ? __pfx___lock_release (kernel/locking/lockdep.c:5406) [ 44.915836][ T10] ? __pfx_process_one_work (kernel/workqueue.c:3156) [ 44.915975][ T10] ? assign_work (kernel/workqueue.c:1209) [ 44.916185][ T10] worker_thread (kernel/workqueue.c:3329 kernel/workqueue.c:3416) [ 44.916320][ T10] ? __pfx_worker_thread (kernel/workqueue.c:3362) [ 44.916453][ T10] kthread (kernel/kthread.c:388) [ 44.916554][ T10] ? __pfx_kthread (kernel/kthread.c:341) [ 44.916765][ T10] ret_from_fork (arch/x86/kernel/process.c:147) [ 44.916900][ T10] ? __pfx_kthread (kernel/kthread.c:341) Finger prints: ret_from_fork_asm:dump_stack_lvl:print_bad_irq_dependency:check_irq_usage