====================================== | [ 238.041147][ T10] ret_from_fork_asm (arch/x86/entry/entry_64.S:256) | [ 238.041280][ T10] | [ 238.041347][ T10] | [ 238.041347][ T10] stack backtrace: [ 238.041706][ T10] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014 [ 238.041996][ T10] Workqueue: netns cleanup_net [ 238.042132][ T10] Call Trace: [ 238.042241][ T10] [ 238.042311][ T10] dump_stack_lvl (lib/dump_stack.c:117) [ 238.042451][ T10] print_bad_irq_dependency (kernel/locking/lockdep.c:2626) [ 238.042585][ T10] ? __pfx_print_bad_irq_dependency (kernel/locking/lockdep.c:2569) [ 238.042750][ T10] ? __pfx_usage_skip (kernel/locking/lockdep.c:2264) [ 238.042881][ T10] ? __bfs (kernel/locking/lockdep.c:1787) [ 238.042981][ T10] ? __pfx_usage_match (kernel/locking/lockdep.c:2256) [ 238.043112][ T10] check_irq_usage (kernel/locking/lockdep.c:2871) [ 238.043321][ T10] ? arch_stack_walk (arch/x86/kernel/stacktrace.c:24) [ 238.043466][ T10] ? __pfx_check_irq_usage (kernel/locking/lockdep.c:2790) [ 238.043610][ T10] ? __bfs (kernel/locking/lockdep.c:1787) [ 238.043719][ T10] ? __pfx_hlock_conflict (kernel/locking/lockdep.c:2016) [ 238.043864][ T10] ? check_path.constprop.0 (kernel/locking/lockdep.c:2145) [ 238.044083][ T10] ? check_noncircular (kernel/locking/lockdep.c:2172) [ 238.044229][ T10] ? __pfx_check_noncircular (kernel/locking/lockdep.c:2163) [ 238.044376][ T10] ? check_prev_add (kernel/locking/lockdep.c:3138) [ 238.044521][ T10] check_prev_add (kernel/locking/lockdep.c:3138) [ 238.044747][ T10] ? validate_chain (./include/linux/hash.h:78 kernel/locking/lockdep.c:3759 kernel/locking/lockdep.c:3782 kernel/locking/lockdep.c:3837) [ 238.044892][ T10] validate_chain (kernel/locking/lockdep.c:3254 kernel/locking/lockdep.c:3869) [ 238.045038][ T10] ? mark_lock (kernel/locking/lockdep.c:4656 (discriminator 3)) [ 238.045149][ T10] ? __pfx_validate_chain (kernel/locking/lockdep.c:3825) [ 238.045370][ 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) [ 238.045515][ T10] ? mark_lock (kernel/locking/lockdep.c:4656 (discriminator 3)) [ 238.045628][ T10] __lock_acquire (kernel/locking/lockdep.c:5137) [ 238.045775][ T10] lock_acquire.part.0 (kernel/locking/lockdep.c:467 kernel/locking/lockdep.c:5756) [ 238.045919][ T10] ? __get_task_comm (fs/exec.c:1234) [ 238.046141][ T10] ? mark_lock (kernel/locking/lockdep.c:4656 (discriminator 3)) [ 238.046241][ T10] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5719) [ 238.046374][ T10] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 52)) [ 238.046504][ T10] ? __get_task_comm (fs/exec.c:1234) [ 238.046710][ T10] ? lock_acquire (kernel/locking/lockdep.c:5727) [ 238.046840][ T10] ? __get_task_comm (fs/exec.c:1234) [ 238.046972][ T10] _raw_spin_lock (./include/linux/spinlock_api_smp.h:134 kernel/locking/spinlock.c:154) [ 238.047102][ T10] ? __get_task_comm (fs/exec.c:1234) [ 238.047237][ T10] __get_task_comm (fs/exec.c:1234) [ 238.047442][ T10] ref_tracker_alloc (lib/ref_tracker.c:217) [ 238.047574][ T10] ? __pfx_ref_tracker_alloc (lib/ref_tracker.c:193) [ 238.047705][ T10] ? __lock_release (kernel/locking/lockdep.c:5430) [ 238.047836][ T10] ? rt6_uncached_list_flush_dev (./include/linux/netdevice.h:4036 ./include/linux/netdevice.h:4114 net/ipv6/route.c:185) [ 238.048150][ T10] ? rt6_disable_ip (net/ipv6/route.c:4910) [ 238.048282][ T10] ? addrconf_ifdown.isra.0 (./include/net/addrconf.h:324 net/ipv6/addrconf.c:3856) [ 238.048413][ T10] ? addrconf_notify (net/ipv6/addrconf.c:3811) [ 238.048544][ T10] ? notifier_call_chain (kernel/notifier.c:93 (discriminator 2)) [ 238.048753][ T10] ? dev_close_many (net/core/dev.c:1571) [ 238.048885][ T10] ? unregister_netdevice_many_notify (net/core/dev.c:11146) [ 238.049055][ T10] ? default_device_exit_batch (net/core/dev.c:11707) [ 238.049219][ T10] ? cleanup_net (net/core/net_namespace.c:636 (discriminator 3)) [ 238.049425][ T10] ? process_one_work (kernel/workqueue.c:3254) [ 238.049558][ T10] ? worker_thread (kernel/workqueue.c:3329 kernel/workqueue.c:3416) [ 238.049693][ T10] ? kthread (kernel/kthread.c:388) [ 238.049796][ T10] ? ret_from_fork (arch/x86/kernel/process.c:147) [ 238.050005][ T10] ? ret_from_fork_asm (arch/x86/entry/entry_64.S:256) [ 238.050137][ T10] ? in6_dev_get (./include/linux/rcupdate.h:339 ./include/linux/rcupdate.h:814 ./include/net/addrconf.h:373) [ 238.050270][ T10] rt6_uncached_list_flush_dev (./include/linux/netdevice.h:4036 ./include/linux/netdevice.h:4114 net/ipv6/route.c:185) [ 238.050435][ T10] rt6_disable_ip (net/ipv6/route.c:4910) [ 238.050643][ T10] ? __pfx_rt6_disable_ip (net/ipv6/route.c:4907) [ 238.050775][ T10] ? mark_lock (kernel/locking/lockdep.c:4656 (discriminator 3)) [ 238.050876][ T10] addrconf_ifdown.isra.0 (./include/net/addrconf.h:324 net/ipv6/addrconf.c:3856) [ 238.051010][ T10] ? __try_to_del_timer_sync (kernel/time/timer.c:1500) [ 238.051147][ T10] ? __pfx_addrconf_ifdown.isra.0 (net/ipv6/addrconf.c:3841) [ 238.051392][ T10] addrconf_notify (net/ipv6/addrconf.c:3811) [ 238.051524][ T10] notifier_call_chain (kernel/notifier.c:93 (discriminator 2)) [ 238.051655][ T10] dev_close_many (net/core/dev.c:1571) [ 238.051787][ T10] ? __pfx_dev_close_many (net/core/dev.c:1558) [ 238.052023][ T10] ? default_device_exit_batch (net/core/dev.c:11693) [ 238.052154][ T10] ? trace_contention_end (./include/trace/events/lock.h:122 (discriminator 52)) [ 238.052290][ T10] unregister_netdevice_many_notify (net/core/dev.c:11146) [ 238.052454][ 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) [ 238.052585][ T10] ? __pfx_unregister_netdevice_many_notify (net/core/dev.c:11113) [ 238.052747][ T10] ? __pfx_unregister_netdevice_queue (net/core/dev.c:11097) [ 238.052911][ T10] default_device_exit_batch (net/core/dev.c:11707) [ 238.053042][ T10] ? __pfx_default_device_exit_batch (net/core/dev.c:11682) [ 238.053204][ T10] ? ops_exit_list (net/core/net_namespace.c:169 (discriminator 3)) [ 238.053336][ T10] cleanup_net (net/core/net_namespace.c:636 (discriminator 3)) [ 238.053470][ T10] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5719) [ 238.053602][ T10] ? __pfx_cleanup_net (net/core/net_namespace.c:581) [ 238.053732][ T10] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 52)) [ 238.053863][ T10] ? process_one_work (kernel/workqueue.c:3230) [ 238.053993][ T10] ? lock_acquire (kernel/locking/lockdep.c:5727) [ 238.054125][ T10] ? process_one_work (kernel/workqueue.c:3230) [ 238.054333][ T10] process_one_work (kernel/workqueue.c:3254) [ 238.054465][ T10] ? __pfx___lock_release (kernel/locking/lockdep.c:5406) [ 238.054599][ T10] ? __pfx_process_one_work (kernel/workqueue.c:3156) [ 238.054731][ T10] ? assign_work (kernel/workqueue.c:1209) [ 238.054963][ T10] worker_thread (kernel/workqueue.c:3329 kernel/workqueue.c:3416) [ 238.055097][ T10] ? __pfx_worker_thread (kernel/workqueue.c:3362) [ 238.055228][ T10] kthread (kernel/kthread.c:388) [ 238.055326][ T10] ? __pfx_kthread (kernel/kthread.c:341) [ 238.055457][ T10] ret_from_fork (arch/x86/kernel/process.c:147) [ 238.055588][ T10] ? __pfx_kthread (kernel/kthread.c:341) Finger prints: ret_from_fork_asm:dump_stack_lvl:print_bad_irq_dependency:check_irq_usage