====================================== | [ 156.241879][ T72] ret_from_fork_asm (arch/x86/entry/entry_64.S:256) | [ 156.242104][ T72] | [ 156.242181][ T72] | [ 156.242181][ T72] stack backtrace: [ 156.242592][ T72] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014 [ 156.243012][ T72] Workqueue: netns cleanup_net [ 156.243167][ T72] Call Trace: [ 156.243283][ T72] [ 156.243362][ T72] dump_stack_lvl (lib/dump_stack.c:117) [ 156.243517][ T72] print_bad_irq_dependency (kernel/locking/lockdep.c:2626) [ 156.243745][ T72] ? __pfx_print_bad_irq_dependency (kernel/locking/lockdep.c:2569) [ 156.243931][ T72] ? __pfx_usage_skip (kernel/locking/lockdep.c:2264) [ 156.244073][ T72] ? __bfs (kernel/locking/lockdep.c:1787) [ 156.244269][ T72] ? __pfx_usage_match (kernel/locking/lockdep.c:2256) [ 156.244417][ T72] check_irq_usage (kernel/locking/lockdep.c:2871) [ 156.244569][ T72] ? arch_stack_walk (arch/x86/kernel/stacktrace.c:24) [ 156.244717][ T72] ? __pfx_check_irq_usage (kernel/locking/lockdep.c:2790) [ 156.244945][ T72] ? __bfs (kernel/locking/lockdep.c:1787) [ 156.245059][ T72] ? __pfx_hlock_conflict (kernel/locking/lockdep.c:2016) [ 156.245211][ T72] ? check_path.constprop.0 (kernel/locking/lockdep.c:2145) [ 156.245360][ T72] ? check_noncircular (kernel/locking/lockdep.c:2172) [ 156.245510][ T72] ? __pfx_check_noncircular (kernel/locking/lockdep.c:2163) [ 156.245747][ T72] ? check_prev_add (kernel/locking/lockdep.c:3138) [ 156.245977][ T72] check_prev_add (kernel/locking/lockdep.c:3138) [ 156.246128][ T72] ? validate_chain (./include/linux/hash.h:78 kernel/locking/lockdep.c:3759 kernel/locking/lockdep.c:3782 kernel/locking/lockdep.c:3837) [ 156.246282][ T72] validate_chain (kernel/locking/lockdep.c:3254 kernel/locking/lockdep.c:3869) [ 156.246431][ T72] ? mark_lock (kernel/locking/lockdep.c:4656 (discriminator 3)) [ 156.246542][ T72] ? __pfx_validate_chain (kernel/locking/lockdep.c:3825) [ 156.246786][ 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) [ 156.246931][ T72] ? mark_lock (kernel/locking/lockdep.c:4656 (discriminator 3)) [ 156.247041][ T72] __lock_acquire (kernel/locking/lockdep.c:5137) [ 156.247191][ T72] lock_acquire.part.0 (kernel/locking/lockdep.c:467 kernel/locking/lockdep.c:5756) [ 156.247347][ T72] ? __get_task_comm (fs/exec.c:1234) [ 156.247582][ T72] ? mark_lock (kernel/locking/lockdep.c:4656 (discriminator 3)) [ 156.247696][ T72] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5719) [ 156.247845][ T72] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 52)) [ 156.248079][ T72] ? __get_task_comm (fs/exec.c:1234) [ 156.248230][ T72] ? lock_acquire (kernel/locking/lockdep.c:5727) [ 156.248377][ T72] ? __get_task_comm (fs/exec.c:1234) [ 156.248532][ T72] _raw_spin_lock (./include/linux/spinlock_api_smp.h:134 kernel/locking/spinlock.c:154) [ 156.248765][ T72] ? __get_task_comm (fs/exec.c:1234) [ 156.248920][ T72] __get_task_comm (fs/exec.c:1234) [ 156.249064][ T72] ref_tracker_alloc (lib/ref_tracker.c:217) [ 156.249214][ T72] ? __pfx_ref_tracker_alloc (lib/ref_tracker.c:193) [ 156.249444][ T72] ? __lock_release (kernel/locking/lockdep.c:5430) [ 156.249588][ T72] ? rt6_uncached_list_flush_dev (./include/linux/netdevice.h:4036 ./include/linux/netdevice.h:4114 net/ipv6/route.c:185) [ 156.249780][ T72] ? rt6_disable_ip (net/ipv6/route.c:4910) [ 156.249925][ T72] ? addrconf_ifdown.isra.0 (./include/net/addrconf.h:324 net/ipv6/addrconf.c:3856) [ 156.250073][ T72] ? addrconf_notify (net/ipv6/addrconf.c:3811) [ 156.250216][ T72] ? notifier_call_chain (kernel/notifier.c:93 (discriminator 2)) [ 156.250362][ T72] ? unregister_netdevice_many_notify (net/core/dev.c:11171) [ 156.250542][ T72] ? default_device_exit_batch (net/core/dev.c:11707) [ 156.250799][ T72] ? cleanup_net (net/core/net_namespace.c:636 (discriminator 3)) [ 156.250944][ T72] ? process_one_work (kernel/workqueue.c:3254) [ 156.251091][ T72] ? worker_thread (kernel/workqueue.c:3329 kernel/workqueue.c:3416) [ 156.251236][ T72] ? kthread (kernel/kthread.c:388) [ 156.251423][ T72] ? ret_from_fork (arch/x86/kernel/process.c:147) [ 156.251568][ T72] ? ret_from_fork_asm (arch/x86/entry/entry_64.S:256) [ 156.251714][ T72] ? in6_dev_get (./include/linux/rcupdate.h:339 ./include/linux/rcupdate.h:814 ./include/net/addrconf.h:373) [ 156.251860][ T72] rt6_uncached_list_flush_dev (./include/linux/netdevice.h:4036 ./include/linux/netdevice.h:4114 net/ipv6/route.c:185) [ 156.252130][ T72] rt6_disable_ip (net/ipv6/route.c:4910) [ 156.252274][ T72] ? __pfx_rt6_disable_ip (net/ipv6/route.c:4907) [ 156.252420][ 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) [ 156.252562][ T72] addrconf_ifdown.isra.0 (./include/net/addrconf.h:324 net/ipv6/addrconf.c:3856) [ 156.252796][ T72] ? __try_to_del_timer_sync (kernel/time/timer.c:1500) [ 156.252943][ T72] ? __pfx_addrconf_ifdown.isra.0 (net/ipv6/addrconf.c:3841) [ 156.253126][ T72] addrconf_notify (net/ipv6/addrconf.c:3811) [ 156.253271][ T72] notifier_call_chain (kernel/notifier.c:93 (discriminator 2)) [ 156.253420][ T72] unregister_netdevice_many_notify (net/core/dev.c:11171) [ 156.253600][ T72] ? mutex_is_locked (./arch/x86/include/asm/atomic64_64.h:15 ./include/linux/atomic/atomic-arch-fallback.h:2583 ./include/linux/atomic/atomic-long.h:38 ./include/linux/atomic/atomic-instrumented.h:3189 kernel/locking/mutex.c:81 kernel/locking/mutex.c:91) [ 156.253750][ T72] ? __pfx_unregister_netdevice_many_notify (net/core/dev.c:11113) [ 156.253937][ T72] ? __pfx_unregister_netdevice_queue (net/core/dev.c:11097) [ 156.254197][ T72] default_device_exit_batch (net/core/dev.c:11707) [ 156.254339][ T72] ? __pfx_default_device_exit_batch (net/core/dev.c:11682) [ 156.254520][ T72] ? ops_exit_list (net/core/net_namespace.c:169 (discriminator 3)) [ 156.254673][ T72] cleanup_net (net/core/net_namespace.c:636 (discriminator 3)) [ 156.254906][ T72] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5719) [ 156.255047][ T72] ? __pfx_cleanup_net (net/core/net_namespace.c:581) [ 156.255189][ T72] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 52)) [ 156.255340][ T72] ? process_one_work (kernel/workqueue.c:3230) [ 156.255491][ T72] ? lock_acquire (kernel/locking/lockdep.c:5727) [ 156.255638][ T72] ? process_one_work (kernel/workqueue.c:3230) [ 156.255884][ T72] process_one_work (kernel/workqueue.c:3254) [ 156.256034][ T72] ? __pfx___lock_release (kernel/locking/lockdep.c:5406) [ 156.256186][ T72] ? __pfx_process_one_work (kernel/workqueue.c:3156) [ 156.256340][ T72] ? assign_work (kernel/workqueue.c:1209) [ 156.256485][ T72] worker_thread (kernel/workqueue.c:3329 kernel/workqueue.c:3416) [ 156.256627][ T72] ? lockdep_hardirqs_on_prepare.part.0 (kernel/locking/lockdep.c:4300 kernel/locking/lockdep.c:4359) [ 156.256817][ T72] ? __pfx_worker_thread (kernel/workqueue.c:3362) [ 156.256968][ T72] ? __pfx_worker_thread (kernel/workqueue.c:3362) [ 156.257121][ T72] kthread (kernel/kthread.c:388) [ 156.257326][ T72] ? __pfx_kthread (kernel/kthread.c:341) [ 156.257478][ T72] ret_from_fork (arch/x86/kernel/process.c:147) [ 156.257627][ T72] ? __pfx_kthread (kernel/kthread.c:341) Finger prints: ret_from_fork_asm:dump_stack_lvl:print_bad_irq_dependency:check_irq_usage