====================================== | [ 34.511793][ T72] ret_from_fork_asm (arch/x86/entry/entry_64.S:256) | [ 34.511940][ T72] | [ 34.512014][ T72] | [ 34.512014][ T72] stack backtrace: [ 34.512499][ T72] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014 [ 34.512938][ T72] Workqueue: netns cleanup_net [ 34.513091][ T72] Call Trace: [ 34.513288][ T72] [ 34.513358][ T72] dump_stack_lvl (lib/dump_stack.c:117) [ 34.513512][ T72] print_bad_irq_dependency (kernel/locking/lockdep.c:2626) [ 34.513657][ T72] ? __pfx_print_bad_irq_dependency (kernel/locking/lockdep.c:2569) [ 34.513852][ T72] ? __pfx_usage_skip (kernel/locking/lockdep.c:2264) [ 34.514076][ T72] ? __bfs (kernel/locking/lockdep.c:1787) [ 34.514186][ T72] ? __pfx_usage_match (kernel/locking/lockdep.c:2256) [ 34.514334][ T72] check_irq_usage (kernel/locking/lockdep.c:2871) [ 34.514481][ T72] ? arch_stack_walk (arch/x86/kernel/stacktrace.c:24) [ 34.514716][ T72] ? __pfx_check_irq_usage (kernel/locking/lockdep.c:2790) [ 34.514864][ T72] ? __bfs (kernel/locking/lockdep.c:1787) [ 34.514978][ T72] ? __pfx_hlock_conflict (kernel/locking/lockdep.c:2016) [ 34.515130][ T72] ? check_path.constprop.0 (kernel/locking/lockdep.c:2145) [ 34.515278][ T72] ? check_noncircular (kernel/locking/lockdep.c:2172) [ 34.515587][ T72] ? __pfx_check_noncircular (kernel/locking/lockdep.c:2163) [ 34.515743][ T72] ? check_prev_add (kernel/locking/lockdep.c:3138) [ 34.515891][ T72] check_prev_add (kernel/locking/lockdep.c:3138) [ 34.516054][ T72] ? validate_chain (./include/linux/hash.h:78 kernel/locking/lockdep.c:3759 kernel/locking/lockdep.c:3782 kernel/locking/lockdep.c:3837) [ 34.516206][ T72] validate_chain (kernel/locking/lockdep.c:3254 kernel/locking/lockdep.c:3869) [ 34.516351][ T72] ? mark_lock (kernel/locking/lockdep.c:4656 (discriminator 3)) [ 34.516464][ T72] ? __pfx_validate_chain (kernel/locking/lockdep.c:3825) [ 34.516615][ 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) [ 34.516845][ T72] ? mark_lock (kernel/locking/lockdep.c:4656 (discriminator 3)) [ 34.516958][ T72] __lock_acquire (kernel/locking/lockdep.c:5137) [ 34.517108][ T72] lock_acquire.part.0 (kernel/locking/lockdep.c:467 kernel/locking/lockdep.c:5756) [ 34.517255][ T72] ? __get_task_comm (fs/exec.c:1234) [ 34.517403][ T72] ? mark_lock (kernel/locking/lockdep.c:4656 (discriminator 3)) [ 34.517598][ T72] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5719) [ 34.517750][ T72] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 52)) [ 34.517906][ T72] ? __get_task_comm (fs/exec.c:1234) [ 34.518053][ T72] ? lock_acquire (kernel/locking/lockdep.c:5727) [ 34.518277][ T72] ? __get_task_comm (fs/exec.c:1234) [ 34.518428][ T72] _raw_spin_lock (./include/linux/spinlock_api_smp.h:134 kernel/locking/spinlock.c:154) [ 34.518576][ T72] ? __get_task_comm (fs/exec.c:1234) [ 34.518727][ T72] __get_task_comm (fs/exec.c:1234) [ 34.518876][ T72] ref_tracker_alloc (lib/ref_tracker.c:217) [ 34.519170][ T72] ? __pfx_ref_tracker_alloc (lib/ref_tracker.c:193) [ 34.519314][ T72] ? __lock_release (kernel/locking/lockdep.c:5430) [ 34.519466][ T72] ? rt6_uncached_list_flush_dev (./include/linux/netdevice.h:4036 ./include/linux/netdevice.h:4114 net/ipv6/route.c:185) [ 34.519654][ T72] ? rt6_disable_ip (net/ipv6/route.c:4910) [ 34.519877][ T72] ? addrconf_ifdown.isra.0 (./include/net/addrconf.h:324 net/ipv6/addrconf.c:3856) [ 34.520105][ T72] ? addrconf_notify (net/ipv6/addrconf.c:3811) [ 34.520250][ T72] ? notifier_call_chain (kernel/notifier.c:93 (discriminator 2)) [ 34.520400][ T72] ? unregister_netdevice_many_notify (net/core/dev.c:11171) [ 34.520593][ T72] ? default_device_exit_batch (net/core/dev.c:11707) [ 34.520773][ T72] ? cleanup_net (net/core/net_namespace.c:636 (discriminator 3)) [ 34.521000][ T72] ? process_one_work (kernel/workqueue.c:3254) [ 34.521145][ T72] ? worker_thread (kernel/workqueue.c:3329 kernel/workqueue.c:3416) [ 34.521372][ T72] ? kthread (kernel/kthread.c:388) [ 34.521480][ T72] ? ret_from_fork (arch/x86/kernel/process.c:147) [ 34.521649][ T72] ? ret_from_fork_asm (arch/x86/entry/entry_64.S:256) [ 34.521802][ T72] ? in6_dev_get (./include/linux/rcupdate.h:339 ./include/linux/rcupdate.h:814 ./include/net/addrconf.h:373) [ 34.522034][ T72] rt6_uncached_list_flush_dev (./include/linux/netdevice.h:4036 ./include/linux/netdevice.h:4114 net/ipv6/route.c:185) [ 34.522215][ T72] rt6_disable_ip (net/ipv6/route.c:4910) [ 34.522362][ T72] ? __pfx_rt6_disable_ip (net/ipv6/route.c:4907) [ 34.522510][ 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) [ 34.522730][ T72] addrconf_ifdown.isra.0 (./include/net/addrconf.h:324 net/ipv6/addrconf.c:3856) [ 34.522879][ T72] ? __try_to_del_timer_sync (kernel/time/timer.c:1500) [ 34.523111][ T72] ? __pfx_addrconf_ifdown.isra.0 (net/ipv6/addrconf.c:3841) [ 34.523299][ T72] addrconf_notify (net/ipv6/addrconf.c:3811) [ 34.523454][ T72] notifier_call_chain (kernel/notifier.c:93 (discriminator 2)) [ 34.523604][ T72] unregister_netdevice_many_notify (net/core/dev.c:11171) [ 34.523874][ 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) [ 34.524032][ T72] ? __pfx_unregister_netdevice_many_notify (net/core/dev.c:11113) [ 34.524218][ T72] ? __pfx_unregister_netdevice_queue (net/core/dev.c:11097) [ 34.524414][ T72] default_device_exit_batch (net/core/dev.c:11707) [ 34.524561][ T72] ? __pfx_default_device_exit_batch (net/core/dev.c:11682) [ 34.524747][ T72] ? ops_exit_list (net/core/net_namespace.c:169 (discriminator 3)) [ 34.524975][ T72] cleanup_net (net/core/net_namespace.c:636 (discriminator 3)) [ 34.525120][ T72] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5719) [ 34.525271][ T72] ? __pfx_cleanup_net (net/core/net_namespace.c:581) [ 34.525416][ T72] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 52)) [ 34.525562][ T72] ? process_one_work (kernel/workqueue.c:3230) [ 34.525706][ T72] ? lock_acquire (kernel/locking/lockdep.c:5727) [ 34.525849][ T72] ? process_one_work (kernel/workqueue.c:3230) [ 34.526004][ T72] process_one_work (kernel/workqueue.c:3254) [ 34.526226][ T72] ? __pfx___lock_release (kernel/locking/lockdep.c:5406) [ 34.526369][ T72] ? __pfx_process_one_work (kernel/workqueue.c:3156) [ 34.526516][ T72] ? assign_work (kernel/workqueue.c:1209) [ 34.526661][ T72] worker_thread (kernel/workqueue.c:3329 kernel/workqueue.c:3416) [ 34.526883][ T72] ? lockdep_hardirqs_on_prepare.part.0 (kernel/locking/lockdep.c:4300 kernel/locking/lockdep.c:4359) [ 34.527066][ T72] ? __pfx_worker_thread (kernel/workqueue.c:3362) [ 34.527216][ T72] ? __pfx_worker_thread (kernel/workqueue.c:3362) [ 34.527360][ T72] kthread (kernel/kthread.c:388) [ 34.527469][ T72] ? __pfx_kthread (kernel/kthread.c:341) [ 34.527689][ T72] ret_from_fork (arch/x86/kernel/process.c:147) [ 34.527836][ T72] ? __pfx_kthread (kernel/kthread.c:341) Finger prints: ret_from_fork_asm:dump_stack_lvl:print_bad_irq_dependency:check_irq_usage