====================================== | [ 68.501005][ T10] ret_from_fork_asm (arch/x86/entry/entry_64.S:256) | [ 68.501138][ T10] | [ 68.501206][ T10] | [ 68.501206][ T10] stack backtrace: [ 68.501564][ T10] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014 [ 68.501857][ T10] Workqueue: netns cleanup_net [ 68.501994][ T10] Call Trace: [ 68.502105][ T10] [ 68.502175][ T10] dump_stack_lvl (lib/dump_stack.c:117) [ 68.502315][ T10] print_bad_irq_dependency (kernel/locking/lockdep.c:2626) [ 68.502457][ T10] ? __pfx_print_bad_irq_dependency (kernel/locking/lockdep.c:2569) [ 68.502647][ T10] ? __pfx_usage_skip (kernel/locking/lockdep.c:2264) [ 68.502870][ T10] ? __bfs (kernel/locking/lockdep.c:1787) [ 68.502973][ T10] ? __pfx_usage_match (kernel/locking/lockdep.c:2256) [ 68.503112][ T10] check_irq_usage (kernel/locking/lockdep.c:2871) [ 68.503249][ T10] ? arch_stack_walk (arch/x86/kernel/stacktrace.c:24) [ 68.503463][ T10] ? __pfx_check_irq_usage (kernel/locking/lockdep.c:2790) [ 68.503595][ T10] ? __bfs (kernel/locking/lockdep.c:1787) [ 68.503694][ T10] ? __pfx_hlock_conflict (kernel/locking/lockdep.c:2016) [ 68.503826][ T10] ? check_path.constprop.0 (kernel/locking/lockdep.c:2145) [ 68.503964][ T10] ? check_noncircular (kernel/locking/lockdep.c:2172) [ 68.504247][ T10] ? __pfx_check_noncircular (kernel/locking/lockdep.c:2163) [ 68.504383][ T10] ? check_prev_add (kernel/locking/lockdep.c:3138) [ 68.504514][ T10] check_prev_add (kernel/locking/lockdep.c:3138) [ 68.504649][ T10] ? validate_chain (./include/linux/hash.h:78 kernel/locking/lockdep.c:3759 kernel/locking/lockdep.c:3782 kernel/locking/lockdep.c:3837) [ 68.504855][ T10] validate_chain (kernel/locking/lockdep.c:3254 kernel/locking/lockdep.c:3869) [ 68.504991][ T10] ? mark_lock (kernel/locking/lockdep.c:4656 (discriminator 3)) [ 68.505091][ T10] ? __pfx_validate_chain (kernel/locking/lockdep.c:3825) [ 68.505223][ 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) [ 68.505353][ T10] ? mark_lock (kernel/locking/lockdep.c:4656 (discriminator 3)) [ 68.505528][ T10] __lock_acquire (kernel/locking/lockdep.c:5137) [ 68.505668][ T10] lock_acquire.part.0 (kernel/locking/lockdep.c:467 kernel/locking/lockdep.c:5756) [ 68.505799][ T10] ? __get_task_comm (fs/exec.c:1234) [ 68.505935][ T10] ? mark_lock (kernel/locking/lockdep.c:4656 (discriminator 3)) [ 68.506109][ T10] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5719) [ 68.506240][ T10] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 52)) [ 68.506380][ T10] ? __get_task_comm (fs/exec.c:1234) [ 68.506516][ T10] ? lock_acquire (kernel/locking/lockdep.c:5727) [ 68.506651][ T10] ? __get_task_comm (fs/exec.c:1234) [ 68.506865][ T10] _raw_spin_lock (./include/linux/spinlock_api_smp.h:134 kernel/locking/spinlock.c:154) [ 68.507010][ T10] ? __get_task_comm (fs/exec.c:1234) [ 68.507151][ T10] __get_task_comm (fs/exec.c:1234) [ 68.507285][ T10] ref_tracker_alloc (lib/ref_tracker.c:217) [ 68.507498][ T10] ? __pfx_ref_tracker_alloc (lib/ref_tracker.c:193) [ 68.507632][ T10] ? __lock_release (kernel/locking/lockdep.c:5430) [ 68.507764][ T10] ? rt6_uncached_list_flush_dev (./include/linux/netdevice.h:4036 ./include/linux/netdevice.h:4114 net/ipv6/route.c:185) [ 68.507928][ T10] ? rt6_disable_ip (net/ipv6/route.c:4910) [ 68.508137][ T10] ? addrconf_ifdown.isra.0 (./include/net/addrconf.h:324 net/ipv6/addrconf.c:3856) [ 68.508273][ T10] ? addrconf_notify (net/ipv6/addrconf.c:3811) [ 68.508407][ T10] ? notifier_call_chain (kernel/notifier.c:93 (discriminator 2)) [ 68.508551][ T10] ? unregister_netdevice_many_notify (net/core/dev.c:11171) [ 68.508797][ T10] ? default_device_exit_batch (net/core/dev.c:11707) [ 68.509059][ T10] ? cleanup_net (net/core/net_namespace.c:636 (discriminator 3)) [ 68.509193][ T10] ? process_one_work (kernel/workqueue.c:3254) [ 68.509335][ T10] ? worker_thread (kernel/workqueue.c:3329 kernel/workqueue.c:3416) [ 68.509473][ T10] ? kthread (kernel/kthread.c:388) [ 68.509575][ T10] ? ret_from_fork (arch/x86/kernel/process.c:147) [ 68.509713][ T10] ? ret_from_fork_asm (arch/x86/entry/entry_64.S:256) [ 68.509854][ T10] ? in6_dev_get (./include/linux/rcupdate.h:339 ./include/linux/rcupdate.h:814 ./include/net/addrconf.h:373) [ 68.510082][ T10] rt6_uncached_list_flush_dev (./include/linux/netdevice.h:4036 ./include/linux/netdevice.h:4114 net/ipv6/route.c:185) [ 68.510257][ T10] rt6_disable_ip (net/ipv6/route.c:4910) [ 68.510402][ T10] ? __pfx_rt6_disable_ip (net/ipv6/route.c:4907) [ 68.510539][ 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) [ 68.510755][ T10] addrconf_ifdown.isra.0 (./include/net/addrconf.h:324 net/ipv6/addrconf.c:3856) [ 68.510896][ T10] ? __try_to_del_timer_sync (kernel/time/timer.c:1500) [ 68.511051][ T10] ? __pfx_addrconf_ifdown.isra.0 (net/ipv6/addrconf.c:3841) [ 68.511225][ T10] addrconf_notify (net/ipv6/addrconf.c:3811) [ 68.511447][ T10] notifier_call_chain (kernel/notifier.c:93 (discriminator 2)) [ 68.511586][ T10] unregister_netdevice_many_notify (net/core/dev.c:11171) [ 68.511760][ T10] ? 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) [ 68.511900][ T10] ? __pfx_unregister_netdevice_many_notify (net/core/dev.c:11113) [ 68.512224][ T10] ? __pfx_unregister_netdevice_queue (net/core/dev.c:11097) [ 68.512400][ T10] default_device_exit_batch (net/core/dev.c:11707) [ 68.512537][ T10] ? __pfx_default_device_exit_batch (net/core/dev.c:11682) [ 68.512735][ T10] ? ops_exit_list (net/core/net_namespace.c:169 (discriminator 3)) [ 68.512874][ T10] cleanup_net (net/core/net_namespace.c:636 (discriminator 3)) [ 68.513101][ T10] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5719) [ 68.513234][ T10] ? __pfx_cleanup_net (net/core/net_namespace.c:581) [ 68.513378][ T10] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 52)) [ 68.513524][ T10] ? process_one_work (kernel/workqueue.c:3230) [ 68.513658][ T10] ? lock_acquire (kernel/locking/lockdep.c:5727) [ 68.513791][ T10] ? process_one_work (kernel/workqueue.c:3230) [ 68.513926][ T10] process_one_work (kernel/workqueue.c:3254) [ 68.514143][ T10] ? __pfx___lock_release (kernel/locking/lockdep.c:5406) [ 68.514281][ T10] ? __pfx_process_one_work (kernel/workqueue.c:3156) [ 68.514418][ T10] ? assign_work (kernel/workqueue.c:1209) [ 68.514559][ T10] worker_thread (kernel/workqueue.c:3329 kernel/workqueue.c:3416) [ 68.514701][ T10] ? __pfx_worker_thread (kernel/workqueue.c:3362) [ 68.514920][ T10] kthread (kernel/kthread.c:388) [ 68.515021][ T10] ? __pfx_kthread (kernel/kthread.c:341) [ 68.515157][ T10] ret_from_fork (arch/x86/kernel/process.c:147) [ 68.515294][ T10] ? __pfx_kthread (kernel/kthread.c:341) Finger prints: ret_from_fork_asm:dump_stack_lvl:print_bad_irq_dependency:check_irq_usage