====================================== | [ 251.443419][ T71] ret_from_fork_asm (arch/x86/entry/entry_64.S:256) | [ 251.443557][ T71] | [ 251.443631][ T71] | [ 251.443631][ T71] stack backtrace: [ 251.444218][ T71] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014 [ 251.444515][ T71] Workqueue: netns cleanup_net [ 251.444665][ T71] Call Trace: [ 251.444848][ T71] [ 251.444924][ T71] dump_stack_lvl (lib/dump_stack.c:117) [ 251.445068][ T71] print_bad_irq_dependency (kernel/locking/lockdep.c:2626) [ 251.445207][ T71] ? __pfx_print_bad_irq_dependency (kernel/locking/lockdep.c:2569) [ 251.445376][ T71] ? __pfx_usage_skip (kernel/locking/lockdep.c:2264) [ 251.445595][ T71] ? __bfs (kernel/locking/lockdep.c:1787) [ 251.445696][ T71] ? __pfx_usage_match (kernel/locking/lockdep.c:2256) [ 251.445829][ T71] check_irq_usage (kernel/locking/lockdep.c:2871) [ 251.445974][ T71] ? arch_stack_walk (arch/x86/kernel/stacktrace.c:24) [ 251.446111][ T71] ? __pfx_check_irq_usage (kernel/locking/lockdep.c:2790) [ 251.446245][ T71] ? __bfs (kernel/locking/lockdep.c:1787) [ 251.446346][ T71] ? __pfx_hlock_conflict (kernel/locking/lockdep.c:2016) [ 251.446483][ T71] ? check_path.constprop.0 (kernel/locking/lockdep.c:2145) [ 251.446617][ T71] ? check_noncircular (kernel/locking/lockdep.c:2172) [ 251.446755][ T71] ? __pfx_check_noncircular (kernel/locking/lockdep.c:2163) [ 251.446893][ T71] ? check_prev_add (kernel/locking/lockdep.c:3138) [ 251.447028][ T71] check_prev_add (kernel/locking/lockdep.c:3138) [ 251.447163][ T71] ? validate_chain (./include/linux/hash.h:78 kernel/locking/lockdep.c:3759 kernel/locking/lockdep.c:3782 kernel/locking/lockdep.c:3837) [ 251.447374][ T71] validate_chain (kernel/locking/lockdep.c:3254 kernel/locking/lockdep.c:3869) [ 251.447511][ T71] ? mark_lock (kernel/locking/lockdep.c:4656 (discriminator 3)) [ 251.447617][ T71] ? __pfx_validate_chain (kernel/locking/lockdep.c:3825) [ 251.447754][ T71] ? 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) [ 251.447887][ T71] ? mark_lock (kernel/locking/lockdep.c:4656 (discriminator 3)) [ 251.448073][ T71] __lock_acquire (kernel/locking/lockdep.c:5137) [ 251.448209][ T71] lock_acquire.part.0 (kernel/locking/lockdep.c:467 kernel/locking/lockdep.c:5756) [ 251.448351][ T71] ? __get_task_comm (fs/exec.c:1234) [ 251.448489][ T71] ? mark_lock (kernel/locking/lockdep.c:4656 (discriminator 3)) [ 251.448666][ T71] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5719) [ 251.448809][ T71] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 52)) [ 251.448944][ T71] ? __get_task_comm (fs/exec.c:1234) [ 251.449088][ T71] ? lock_acquire (kernel/locking/lockdep.c:5727) [ 251.449228][ T71] ? __get_task_comm (fs/exec.c:1234) [ 251.449438][ T71] _raw_spin_lock (./include/linux/spinlock_api_smp.h:134 kernel/locking/spinlock.c:154) [ 251.449580][ T71] ? __get_task_comm (fs/exec.c:1234) [ 251.449721][ T71] __get_task_comm (fs/exec.c:1234) [ 251.449859][ T71] ref_tracker_alloc (lib/ref_tracker.c:217) [ 251.450077][ T71] ? __pfx_ref_tracker_alloc (lib/ref_tracker.c:193) [ 251.450215][ T71] ? __lock_release (kernel/locking/lockdep.c:5430) [ 251.450348][ T71] ? rt6_uncached_list_flush_dev (./include/linux/netdevice.h:4036 ./include/linux/netdevice.h:4114 net/ipv6/route.c:185) [ 251.450523][ T71] ? rt6_disable_ip (net/ipv6/route.c:4910) [ 251.450735][ T71] ? addrconf_ifdown.isra.0 (./include/net/addrconf.h:324 net/ipv6/addrconf.c:3856) [ 251.450874][ T71] ? addrconf_notify (net/ipv6/addrconf.c:3811) [ 251.451012][ T71] ? notifier_call_chain (kernel/notifier.c:93 (discriminator 2)) [ 251.451150][ T71] ? dev_close_many (net/core/dev.c:1571) [ 251.451362][ T71] ? unregister_netdevice_many_notify (net/core/dev.c:11146) [ 251.451536][ T71] ? default_device_exit_batch (net/core/dev.c:11707) [ 251.451706][ T71] ? cleanup_net (net/core/net_namespace.c:636 (discriminator 3)) [ 251.451840][ T71] ? process_one_work (kernel/workqueue.c:3254) [ 251.452058][ T71] ? worker_thread (kernel/workqueue.c:3329 kernel/workqueue.c:3416) [ 251.452196][ T71] ? kthread (kernel/kthread.c:388) [ 251.452299][ T71] ? ret_from_fork (arch/x86/kernel/process.c:147) [ 251.452433][ T71] ? ret_from_fork_asm (arch/x86/entry/entry_64.S:256) [ 251.452650][ T71] ? in6_dev_get (./include/linux/rcupdate.h:339 ./include/linux/rcupdate.h:814 ./include/net/addrconf.h:373) [ 251.452788][ T71] rt6_uncached_list_flush_dev (./include/linux/netdevice.h:4036 ./include/linux/netdevice.h:4114 net/ipv6/route.c:185) [ 251.452963][ T71] rt6_disable_ip (net/ipv6/route.c:4910) [ 251.453099][ T71] ? __pfx_rt6_disable_ip (net/ipv6/route.c:4907) [ 251.453311][ T71] ? mark_lock (kernel/locking/lockdep.c:4656 (discriminator 3)) [ 251.453416][ T71] addrconf_ifdown.isra.0 (./include/net/addrconf.h:324 net/ipv6/addrconf.c:3856) [ 251.453568][ T71] ? __try_to_del_timer_sync (kernel/time/timer.c:1500) [ 251.453704][ T71] ? __pfx_addrconf_ifdown.isra.0 (net/ipv6/addrconf.c:3841) [ 251.453875][ T71] addrconf_notify (net/ipv6/addrconf.c:3811) [ 251.454103][ T71] ? fib_netdev_event (net/ipv4/fib_frontend.c:1520) [ 251.454241][ T71] notifier_call_chain (kernel/notifier.c:93 (discriminator 2)) [ 251.454376][ T71] dev_close_many (net/core/dev.c:1571) [ 251.454514][ T71] ? __pfx_dev_close_many (net/core/dev.c:1558) [ 251.454803][ T71] ? default_device_exit_batch (net/core/dev.c:11693) [ 251.454942][ T71] ? trace_contention_end (./include/trace/events/lock.h:122 (discriminator 52)) [ 251.455082][ T71] unregister_netdevice_many_notify (net/core/dev.c:11146) [ 251.455255][ T71] ? 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) [ 251.455467][ T71] ? __pfx_unregister_netdevice_many_notify (net/core/dev.c:11113) [ 251.455643][ T71] ? __pfx_unregister_netdevice_queue (net/core/dev.c:11097) [ 251.455814][ T71] default_device_exit_batch (net/core/dev.c:11707) [ 251.455954][ T71] ? __pfx_default_device_exit_batch (net/core/dev.c:11682) [ 251.456215][ T71] ? 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) [ 251.456354][ T71] ? nexthop_net_exit_batch_rtnl (net/ipv4/nexthop.c:585 net/ipv4/nexthop.c:2145 net/ipv4/nexthop.c:2653 net/ipv4/nexthop.c:4003) [ 251.456526][ T71] cleanup_net (net/core/net_namespace.c:636 (discriminator 3)) [ 251.456741][ T71] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5719) [ 251.456874][ T71] ? __pfx_cleanup_net (net/core/net_namespace.c:581) [ 251.457037][ T71] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 52)) [ 251.457189][ T71] ? process_one_work (kernel/workqueue.c:3230) [ 251.457337][ T71] ? lock_acquire (kernel/locking/lockdep.c:5727) [ 251.457569][ T71] ? process_one_work (kernel/workqueue.c:3230) [ 251.457726][ T71] process_one_work (kernel/workqueue.c:3254) [ 251.457880][ T71] ? __pfx___lock_release (kernel/locking/lockdep.c:5406) [ 251.458032][ T71] ? __pfx_process_one_work (kernel/workqueue.c:3156) [ 251.458262][ T71] ? assign_work (kernel/workqueue.c:1209) [ 251.458413][ T71] worker_thread (kernel/workqueue.c:3329 kernel/workqueue.c:3416) [ 251.458566][ T71] ? lockdep_hardirqs_on_prepare.part.0 (kernel/locking/lockdep.c:4300 kernel/locking/lockdep.c:4359) [ 251.458760][ T71] ? __pfx_worker_thread (kernel/workqueue.c:3362) [ 251.458992][ T71] ? __pfx_worker_thread (kernel/workqueue.c:3362) [ 251.459143][ T71] kthread (kernel/kthread.c:388) [ 251.459258][ T71] ? __pfx_kthread (kernel/kthread.c:341) [ 251.459412][ T71] ret_from_fork (arch/x86/kernel/process.c:147) [ 251.459641][ T71] ? __pfx_kthread (kernel/kthread.c:341) Finger prints: ret_from_fork_asm:dump_stack_lvl:print_bad_irq_dependency:check_irq_usage