====================================== | [ 221.257401][ T10] ret_from_fork_asm (arch/x86/entry/entry_64.S:256) | [ 221.257631][ T10] | [ 221.257709][ T10] | [ 221.257709][ T10] stack backtrace: [ 221.258115][ T10] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014 [ 221.258521][ T10] Workqueue: netns cleanup_net [ 221.258679][ T10] Call Trace: [ 221.258798][ T10] [ 221.258875][ T10] dump_stack_lvl (lib/dump_stack.c:117) [ 221.259103][ T10] print_bad_irq_dependency (kernel/locking/lockdep.c:2626) [ 221.259252][ T10] ? __pfx_print_bad_irq_dependency (kernel/locking/lockdep.c:2569) [ 221.259446][ T10] ? __pfx_usage_skip (kernel/locking/lockdep.c:2264) [ 221.259672][ T10] ? __bfs (kernel/locking/lockdep.c:1787) [ 221.259785][ T10] ? __pfx_usage_match (kernel/locking/lockdep.c:2256) [ 221.259939][ T10] check_irq_usage (kernel/locking/lockdep.c:2871) [ 221.260237][ T10] ? arch_stack_walk (arch/x86/kernel/stacktrace.c:24) [ 221.260471][ T10] ? __pfx_check_irq_usage (kernel/locking/lockdep.c:2790) [ 221.260625][ T10] ? __bfs (kernel/locking/lockdep.c:1787) [ 221.260737][ T10] ? __pfx_hlock_conflict (kernel/locking/lockdep.c:2016) [ 221.260895][ T10] ? check_path.constprop.0 (kernel/locking/lockdep.c:2145) [ 221.261043][ T10] ? check_noncircular (kernel/locking/lockdep.c:2172) [ 221.261278][ T10] ? __pfx_check_noncircular (kernel/locking/lockdep.c:2163) [ 221.261431][ T10] ? check_prev_add (kernel/locking/lockdep.c:3138) [ 221.261587][ T10] check_prev_add (kernel/locking/lockdep.c:3138) [ 221.261737][ T10] ? validate_chain (./include/linux/hash.h:78 kernel/locking/lockdep.c:3759 kernel/locking/lockdep.c:3782 kernel/locking/lockdep.c:3837) [ 221.261987][ T10] validate_chain (kernel/locking/lockdep.c:3254 kernel/locking/lockdep.c:3869) [ 221.262138][ T10] ? mark_lock (kernel/locking/lockdep.c:4656 (discriminator 3)) [ 221.262252][ T10] ? __pfx_validate_chain (kernel/locking/lockdep.c:3825) [ 221.262403][ 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) [ 221.262552][ T10] ? mark_lock (kernel/locking/lockdep.c:4656 (discriminator 3)) [ 221.262669][ T10] __lock_acquire (kernel/locking/lockdep.c:5137) [ 221.262820][ T10] lock_acquire.part.0 (kernel/locking/lockdep.c:467 kernel/locking/lockdep.c:5756) [ 221.262970][ T10] ? __get_task_comm (fs/exec.c:1234) [ 221.263118][ T10] ? mark_lock (kernel/locking/lockdep.c:4656 (discriminator 3)) [ 221.263234][ T10] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5719) [ 221.263384][ T10] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 52)) [ 221.263533][ T10] ? __get_task_comm (fs/exec.c:1234) [ 221.263681][ T10] ? lock_acquire (kernel/locking/lockdep.c:5727) [ 221.263828][ T10] ? __get_task_comm (fs/exec.c:1234) [ 221.263979][ T10] _raw_spin_lock (./include/linux/spinlock_api_smp.h:134 kernel/locking/spinlock.c:154) [ 221.264126][ T10] ? __get_task_comm (fs/exec.c:1234) [ 221.264275][ T10] __get_task_comm (fs/exec.c:1234) [ 221.264427][ T10] ref_tracker_alloc (lib/ref_tracker.c:217) [ 221.264653][ T10] ? __pfx_ref_tracker_alloc (lib/ref_tracker.c:193) [ 221.264800][ T10] ? __lock_release (kernel/locking/lockdep.c:5430) [ 221.264949][ T10] ? rt6_uncached_list_flush_dev (./include/linux/netdevice.h:4036 ./include/linux/netdevice.h:4114 net/ipv6/route.c:185) [ 221.265132][ T10] ? rt6_disable_ip (net/ipv6/route.c:4910) [ 221.265359][ T10] ? addrconf_ifdown.isra.0 (./include/net/addrconf.h:324 net/ipv6/addrconf.c:3856) [ 221.265508][ T10] ? addrconf_notify (net/ipv6/addrconf.c:3811) [ 221.265657][ T10] ? notifier_call_chain (kernel/notifier.c:93 (discriminator 2)) [ 221.265803][ T10] ? dev_close_many (net/core/dev.c:1571) [ 221.266053][ T10] ? unregister_netdevice_many_notify (net/core/dev.c:11146) [ 221.266237][ T10] ? default_device_exit_batch (net/core/dev.c:11707) [ 221.266422][ T10] ? cleanup_net (net/core/net_namespace.c:636 (discriminator 3)) [ 221.266570][ T10] ? process_one_work (kernel/workqueue.c:3254) [ 221.266719][ T10] ? worker_thread (kernel/workqueue.c:3329 kernel/workqueue.c:3416) [ 221.266870][ T10] ? kthread (kernel/kthread.c:388) [ 221.266981][ T10] ? ret_from_fork (arch/x86/kernel/process.c:147) [ 221.267133][ T10] ? ret_from_fork_asm (arch/x86/entry/entry_64.S:256) [ 221.267283][ T10] ? in6_dev_get (./include/linux/rcupdate.h:339 ./include/linux/rcupdate.h:814 ./include/net/addrconf.h:373) [ 221.267435][ T10] rt6_uncached_list_flush_dev (./include/linux/netdevice.h:4036 ./include/linux/netdevice.h:4114 net/ipv6/route.c:185) [ 221.267621][ T10] rt6_disable_ip (net/ipv6/route.c:4910) [ 221.267770][ T10] ? __pfx_rt6_disable_ip (net/ipv6/route.c:4907) [ 221.267920][ T10] ? mark_lock (kernel/locking/lockdep.c:4656 (discriminator 3)) [ 221.268040][ T10] addrconf_ifdown.isra.0 (./include/net/addrconf.h:324 net/ipv6/addrconf.c:3856) [ 221.268191][ T10] ? __try_to_del_timer_sync (kernel/time/timer.c:1500) [ 221.268423][ T10] ? __pfx_addrconf_ifdown.isra.0 (net/ipv6/addrconf.c:3841) [ 221.268613][ T10] addrconf_notify (net/ipv6/addrconf.c:3811) [ 221.268767][ T10] notifier_call_chain (kernel/notifier.c:93 (discriminator 2)) [ 221.268915][ T10] dev_close_many (net/core/dev.c:1571) [ 221.269067][ T10] ? __pfx_dev_close_many (net/core/dev.c:1558) [ 221.269212][ T10] ? default_device_exit_batch (net/core/dev.c:11693) [ 221.269530][ T10] ? trace_contention_end (./include/trace/events/lock.h:122 (discriminator 52)) [ 221.269685][ T10] unregister_netdevice_many_notify (net/core/dev.c:11146) [ 221.269867][ 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) [ 221.270017][ T10] ? __pfx_unregister_netdevice_many_notify (net/core/dev.c:11113) [ 221.270204][ T10] ? __pfx_unregister_netdevice_queue (net/core/dev.c:11097) [ 221.270480][ T10] default_device_exit_batch (net/core/dev.c:11707) [ 221.270627][ T10] ? __pfx_default_device_exit_batch (net/core/dev.c:11682) [ 221.270818][ T10] ? ops_exit_list (net/core/net_namespace.c:169 (discriminator 3)) [ 221.270970][ T10] cleanup_net (net/core/net_namespace.c:636 (discriminator 3)) [ 221.271119][ T10] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5719) [ 221.271361][ T10] ? __pfx_cleanup_net (net/core/net_namespace.c:581) [ 221.271514][ T10] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 52)) [ 221.271668][ T10] ? process_one_work (kernel/workqueue.c:3230) [ 221.271816][ T10] ? lock_acquire (kernel/locking/lockdep.c:5727) [ 221.272068][ T10] ? process_one_work (kernel/workqueue.c:3230) [ 221.272225][ T10] process_one_work (kernel/workqueue.c:3254) [ 221.272376][ T10] ? __pfx___lock_release (kernel/locking/lockdep.c:5406) [ 221.272529][ T10] ? __pfx_process_one_work (kernel/workqueue.c:3156) [ 221.272679][ T10] ? assign_work (kernel/workqueue.c:1209) [ 221.272827][ T10] worker_thread (kernel/workqueue.c:3329 kernel/workqueue.c:3416) [ 221.272981][ T10] ? __pfx_worker_thread (kernel/workqueue.c:3362) [ 221.273214][ T10] kthread (kernel/kthread.c:388) [ 221.273326][ T10] ? __pfx_kthread (kernel/kthread.c:341) [ 221.273478][ T10] ret_from_fork (arch/x86/kernel/process.c:147) [ 221.273627][ T10] ? __pfx_kthread (kernel/kthread.c:341) Finger prints: ret_from_fork_asm:dump_stack_lvl:print_bad_irq_dependency:check_irq_usage