====================================== | [ 24.894689][ T72] ret_from_fork_asm (arch/x86/entry/entry_64.S:256) | [ 24.894851][ T72] | [ 24.894934][ T72] | [ 24.894934][ T72] stack backtrace: [ 24.895371][ T72] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014 [ 24.895724][ T72] Workqueue: netns cleanup_net [ 24.895890][ T72] Call Trace: [ 24.896019][ T72] [ 24.896104][ T72] dump_stack_lvl (lib/dump_stack.c:117) [ 24.896270][ T72] print_bad_irq_dependency (kernel/locking/lockdep.c:2626) [ 24.896436][ T72] ? __pfx_print_bad_irq_dependency (kernel/locking/lockdep.c:2569) [ 24.896718][ T72] ? __pfx_usage_skip (kernel/locking/lockdep.c:2264) [ 24.896880][ T72] ? __bfs (kernel/locking/lockdep.c:1787) [ 24.897019][ T72] ? __pfx_usage_match (kernel/locking/lockdep.c:2256) [ 24.897189][ T72] check_irq_usage (kernel/locking/lockdep.c:2871) [ 24.897540][ T72] ? arch_stack_walk (arch/x86/kernel/stacktrace.c:24) [ 24.897708][ T72] ? __pfx_check_irq_usage (kernel/locking/lockdep.c:2790) [ 24.897876][ T72] ? __bfs (kernel/locking/lockdep.c:1787) [ 24.898022][ T72] ? __pfx_hlock_conflict (kernel/locking/lockdep.c:2016) [ 24.898189][ T72] ? check_path.constprop.0 (kernel/locking/lockdep.c:2145) [ 24.898363][ T72] ? check_noncircular (kernel/locking/lockdep.c:2172) [ 24.898527][ T72] ? __pfx_check_noncircular (kernel/locking/lockdep.c:2163) [ 24.898796][ T72] ? check_prev_add (kernel/locking/lockdep.c:3138) [ 24.898987][ T72] check_prev_add (kernel/locking/lockdep.c:3138) [ 24.899166][ T72] ? validate_chain (./include/linux/hash.h:78 kernel/locking/lockdep.c:3759 kernel/locking/lockdep.c:3782 kernel/locking/lockdep.c:3837) [ 24.899330][ T72] validate_chain (kernel/locking/lockdep.c:3254 kernel/locking/lockdep.c:3869) [ 24.899585][ T72] ? mark_lock (kernel/locking/lockdep.c:4656 (discriminator 3)) [ 24.899720][ T72] ? __pfx_validate_chain (kernel/locking/lockdep.c:3825) [ 24.899888][ 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) [ 24.900059][ T72] ? mark_lock (kernel/locking/lockdep.c:4656 (discriminator 3)) [ 24.900199][ T72] __lock_acquire (kernel/locking/lockdep.c:5137) [ 24.900370][ T72] lock_acquire.part.0 (kernel/locking/lockdep.c:467 kernel/locking/lockdep.c:5756) [ 24.900539][ T72] ? __get_task_comm (fs/exec.c:1234) [ 24.900801][ T72] ? mark_lock (kernel/locking/lockdep.c:4656 (discriminator 3)) [ 24.900926][ T72] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5719) [ 24.901107][ T72] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 52)) [ 24.901274][ T72] ? __get_task_comm (fs/exec.c:1234) [ 24.901518][ T72] ? lock_acquire (kernel/locking/lockdep.c:5727) [ 24.901706][ T72] ? __get_task_comm (fs/exec.c:1234) [ 24.901868][ T72] _raw_spin_lock (./include/linux/spinlock_api_smp.h:134 kernel/locking/spinlock.c:154) [ 24.902053][ T72] ? __get_task_comm (fs/exec.c:1234) [ 24.902217][ T72] __get_task_comm (fs/exec.c:1234) [ 24.902385][ T72] ref_tracker_alloc (lib/ref_tracker.c:217) [ 24.902574][ T72] ? __pfx_ref_tracker_alloc (lib/ref_tracker.c:193) [ 24.902736][ T72] ? __lock_release (kernel/locking/lockdep.c:5430) [ 24.902917][ T72] ? rt6_uncached_list_flush_dev (./include/linux/netdevice.h:4036 ./include/linux/netdevice.h:4114 net/ipv6/route.c:185) [ 24.903205][ T72] ? rt6_disable_ip (net/ipv6/route.c:4910) [ 24.903375][ T72] ? addrconf_ifdown.isra.0 (./include/net/addrconf.h:324 net/ipv6/addrconf.c:3856) [ 24.903558][ T72] ? addrconf_notify (net/ipv6/addrconf.c:3811) [ 24.903728][ T72] ? notifier_call_chain (kernel/notifier.c:93 (discriminator 2)) [ 24.903988][ T72] ? dev_close_many (net/core/dev.c:1571) [ 24.904155][ T72] ? unregister_netdevice_many_notify (net/core/dev.c:11146) [ 24.904364][ T72] ? default_device_exit_batch (net/core/dev.c:11707) [ 24.904653][ T72] ? cleanup_net (net/core/net_namespace.c:636 (discriminator 3)) [ 24.904837][ T72] ? process_one_work (kernel/workqueue.c:3254) [ 24.905161][ T72] ? worker_thread (kernel/workqueue.c:3329 kernel/workqueue.c:3416) [ 24.905335][ T72] ? kthread (kernel/kthread.c:388) [ 24.905481][ T72] ? ret_from_fork (arch/x86/kernel/process.c:147) [ 24.905646][ T72] ? ret_from_fork_asm (arch/x86/entry/entry_64.S:256) [ 24.905905][ T72] ? in6_dev_get (./include/linux/rcupdate.h:339 ./include/linux/rcupdate.h:814 ./include/net/addrconf.h:373) [ 24.906075][ T72] rt6_uncached_list_flush_dev (./include/linux/netdevice.h:4036 ./include/linux/netdevice.h:4114 net/ipv6/route.c:185) [ 24.906298][ T72] rt6_disable_ip (net/ipv6/route.c:4910) [ 24.906468][ T72] ? __pfx_rt6_disable_ip (net/ipv6/route.c:4907) [ 24.906637][ T72] ? mark_lock (kernel/locking/lockdep.c:4656 (discriminator 3)) [ 24.906850][ T72] addrconf_ifdown.isra.0 (./include/net/addrconf.h:324 net/ipv6/addrconf.c:3856) [ 24.907019][ T72] ? __try_to_del_timer_sync (kernel/time/timer.c:1500) [ 24.907197][ T72] ? __pfx_addrconf_ifdown.isra.0 (net/ipv6/addrconf.c:3841) [ 24.907414][ T72] addrconf_notify (net/ipv6/addrconf.c:3811) [ 24.907591][ T72] notifier_call_chain (kernel/notifier.c:93 (discriminator 2)) [ 24.907838][ T72] dev_close_many (net/core/dev.c:1571) [ 24.908007][ T72] ? __pfx_dev_close_many (net/core/dev.c:1558) [ 24.908187][ T72] ? default_device_exit_batch (net/core/dev.c:11693) [ 24.908356][ T72] ? trace_contention_end (./include/trace/events/lock.h:122 (discriminator 52)) [ 24.908526][ T72] unregister_netdevice_many_notify (net/core/dev.c:11146) [ 24.908840][ 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) [ 24.909013][ T72] ? __pfx_unregister_netdevice_many_notify (net/core/dev.c:11113) [ 24.909232][ T72] ? __pfx_unregister_netdevice_queue (net/core/dev.c:11097) [ 24.909534][ T72] default_device_exit_batch (net/core/dev.c:11707) [ 24.909704][ T72] ? __pfx_default_device_exit_batch (net/core/dev.c:11682) [ 24.909921][ T72] ? ops_exit_list (net/core/net_namespace.c:169 (discriminator 3)) [ 24.910086][ T72] cleanup_net (net/core/net_namespace.c:636 (discriminator 3)) [ 24.910354][ T72] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5719) [ 24.910595][ T72] ? __pfx_cleanup_net (net/core/net_namespace.c:581) [ 24.910760][ T72] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 52)) [ 24.910948][ T72] ? process_one_work (kernel/workqueue.c:3230) [ 24.911113][ T72] ? lock_acquire (kernel/locking/lockdep.c:5727) [ 24.911378][ T72] ? process_one_work (kernel/workqueue.c:3230) [ 24.911541][ T72] process_one_work (kernel/workqueue.c:3254) [ 24.911704][ T72] ? __pfx___lock_release (kernel/locking/lockdep.c:5406) [ 24.911867][ T72] ? __pfx_process_one_work (kernel/workqueue.c:3156) [ 24.912029][ T72] ? assign_work (kernel/workqueue.c:1209) [ 24.912269][ T72] worker_thread (kernel/workqueue.c:3329 kernel/workqueue.c:3416) [ 24.912435][ T72] ? lockdep_hardirqs_on_prepare.part.0 (kernel/locking/lockdep.c:4300 kernel/locking/lockdep.c:4359) [ 24.912642][ T72] ? __pfx_worker_thread (kernel/workqueue.c:3362) [ 24.912805][ T72] ? __pfx_worker_thread (kernel/workqueue.c:3362) [ 24.913042][ T72] kthread (kernel/kthread.c:388) [ 24.913165][ T72] ? __pfx_kthread (kernel/kthread.c:341) [ 24.913327][ T72] ret_from_fork (arch/x86/kernel/process.c:147) [ 24.913493][ T72] ? __pfx_kthread (kernel/kthread.c:341) Finger prints: ret_from_fork_asm:dump_stack_lvl:print_bad_irq_dependency:check_irq_usage