====================================== | [ 34.667160][ T436] #0: ffffffffbc407e88 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_dellink (net/core/rtnetlink.c:3521) | [ 34.667421][ T436] #1: ffffffffbc3f6a70 ((netdev_chain).rwsem){++++}-{4:4}, at: blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368) | [ 34.667711][ T436] | [ 34.667711][ T436] stack backtrace: [ 34.668117][ T436] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 34.668292][ T436] Call Trace: [ 34.668406][ T436] [ 34.668484][ T436] dump_stack_lvl (lib/dump_stack.c:123) [ 34.668647][ T436] print_deadlock_bug (kernel/locking/lockdep.c:3040) [ 34.668797][ T436] validate_chain (kernel/locking/lockdep.c:3894) [ 34.668946][ T436] ? __pfx_validate_chain (kernel/locking/lockdep.c:3860) [ 34.669096][ T436] ? 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) [ 34.669252][ T436] ? mark_lock (kernel/locking/lockdep.c:4727 (discriminator 3)) [ 34.669361][ T436] __lock_acquire (kernel/locking/lockdep.c:5226) [ 34.669515][ T436] lock_acquire.part.0 (kernel/locking/lockdep.c:467 kernel/locking/lockdep.c:5851) [ 34.669665][ T436] ? blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368) [ 34.669846][ T436] ? __lock_acquire (kernel/locking/lockdep.c:5226) [ 34.669989][ T436] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814) [ 34.670142][ T436] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 37)) [ 34.670286][ T436] ? lock_acquire (kernel/locking/lockdep.c:5822) [ 34.670432][ T436] ? blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368) [ 34.670610][ T436] down_read (./arch/x86/include/asm/preempt.h:79 kernel/locking/rwsem.c:1246 kernel/locking/rwsem.c:1261 kernel/locking/rwsem.c:1526) [ 34.670721][ T436] ? blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368) [ 34.670898][ T436] ? __pfx_down_read (kernel/locking/rwsem.c:1522) [ 34.671044][ T436] ? __lock_release (kernel/locking/lockdep.c:5525) [ 34.671188][ T436] blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368) [ 34.671331][ T436] __netdev_upper_dev_unlink (net/core/dev.c:8000 (discriminator 11) net/core/dev.c:8017 (discriminator 11) net/core/dev.c:8167 (discriminator 11)) [ 34.671481][ T436] ? mark_held_locks (kernel/locking/lockdep.c:4321) [ 34.671624][ T436] ? __pfx___netdev_upper_dev_unlink (net/core/dev.c:8151) [ 34.671799][ T436] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4347 kernel/locking/lockdep.c:4406) [ 34.671977][ T436] ? __try_to_del_timer_sync (kernel/time/timer.c:1498) [ 34.672120][ T436] ? __pfx___try_to_del_timer_sync (kernel/time/timer.c:1498) [ 34.672297][ T436] ? mark_held_locks (kernel/locking/lockdep.c:4321) [ 34.672441][ T436] netdev_upper_dev_unlink (net/core/dev.c:8190) [ 34.672589][ T436] ? __pfx_netdev_upper_dev_unlink (net/core/dev.c:8190) [ 34.672766][ T436] ? 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.h:47 kernel/locking/mutex.c:66) [ 34.672909][ T436] ? rtnl_is_locked (net/core/rtnetlink.c:163) [ 34.673053][ T436] ? netdev_master_upper_dev_get (net/core/dev.c:7230) [ 34.673230][ T436] vrf_device_event (drivers/net/vrf.c:1110 drivers/net/vrf.c:1119 drivers/net/vrf.c:1804) [ 34.673375][ T436] notifier_call_chain (kernel/notifier.c:85 (discriminator 2)) [ 34.673519][ T436] blocking_notifier_call_chain (kernel/notifier.c:381 kernel/notifier.c:368) [ 34.673670][ T436] unregister_netdevice_many_notify (net/core/dev.c:11575) [ 34.673851][ T436] ? __pfx_unregister_netdevice_many_notify (net/core/dev.c:11516) [ 34.674030][ T436] ? rtnl_dellink (net/core/rtnetlink.c:3521) [ 34.674178][ T436] ? sock_def_readable (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/core/sock.c:3479) [ 34.674325][ T436] ? rtnl_is_locked (net/core/rtnetlink.c:163) [ 34.674466][ T436] ? unregister_netdevice_queue (net/core/dev.c:11501) [ 34.674646][ T436] ? __pfx_unregister_netdevice_queue (net/core/dev.c:11500) [ 34.674825][ T436] ? __pfx_unregister_netdevice_queue (net/core/dev.c:11500) [ 34.675003][ T436] rtnl_dellink (net/core/rtnetlink.c:3487 net/core/rtnetlink.c:3527) [ 34.675147][ T436] ? __pfx_rtnl_dellink (net/core/rtnetlink.c:3493) [ 34.675303][ T436] ? find_held_lock (kernel/locking/lockdep.c:5339) [ 34.675446][ T436] ? __lock_release (kernel/locking/lockdep.c:5525) [ 34.675587][ T436] ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/core/rtnetlink.c:6909) [ 34.675729][ T436] ? __pfx___lock_release (kernel/locking/lockdep.c:5501) [ 34.675882][ T436] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814) [ 34.676030][ T436] ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/core/rtnetlink.c:6909) [ 34.676171][ T436] ? __pfx_rtnl_dellink (net/core/rtnetlink.c:3493) [ 34.676313][ T436] rtnetlink_rcv_msg (net/core/rtnetlink.c:6911) [ 34.676455][ T436] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6814) [ 34.676600][ T436] ? 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) [ 34.676740][ T436] ? mark_lock (kernel/locking/lockdep.c:4727 (discriminator 3)) [ 34.676854][ T436] ? __lock_acquire (kernel/locking/lockdep.c:5226) [ 34.676996][ T436] netlink_rcv_skb (net/netlink/af_netlink.c:2543) [ 34.677141][ T436] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6814) [ 34.677294][ T436] ? __pfx_netlink_rcv_skb (net/netlink/af_netlink.c:2520) [ 34.677453][ T436] ? netlink_deliver_tap (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/netlink/af_netlink.c:340) [ 34.677609][ T436] ? netlink_deliver_tap (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 ./include/net/netns/generic.h:48 net/netlink/af_netlink.c:333) [ 34.677766][ T436] netlink_unicast (net/netlink/af_netlink.c:1322 net/netlink/af_netlink.c:1348) [ 34.677929][ T436] ? __pfx_netlink_unicast (net/netlink/af_netlink.c:1333) [ 34.678085][ T436] ? find_held_lock (kernel/locking/lockdep.c:5339) [ 34.678246][ T436] netlink_sendmsg (net/netlink/af_netlink.c:1892) [ 34.678406][ T436] ? __pfx_netlink_sendmsg (net/netlink/af_netlink.c:1811) [ 34.678565][ T436] ____sys_sendmsg (net/socket.c:711 net/socket.c:726 net/socket.c:2594) [ 34.678724][ T436] ? __pfx_____sys_sendmsg (net/socket.c:2540) [ 34.678881][ T436] ? __pfx_copy_msghdr_from_user (net/socket.c:2520) [ 34.679088][ T436] ___sys_sendmsg (net/socket.c:2650) [ 34.679246][ T436] ? __pfx____sys_sendmsg (net/socket.c:2637) [ 34.679404][ T436] ? kasan_save_stack (mm/kasan/common.c:49) [ 34.679571][ T436] ? kasan_save_stack (mm/kasan/common.c:48) [ 34.679729][ T436] ? __kasan_record_aux_stack (mm/kasan/generic.c:544) [ 34.679888][ T436] ? __call_rcu_common.constprop.0 (./arch/x86/include/asm/irqflags.h:26 ./arch/x86/include/asm/irqflags.h:87 ./arch/x86/include/asm/irqflags.h:123 kernel/rcu/tree.c:3087) [ 34.680086][ T436] ? __x64_sys_close (fs/open.c:1557 fs/open.c:1539 fs/open.c:1539) [ 34.680251][ T436] ? do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) [ 34.680412][ T436] ? entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) [ 34.680609][ T436] ? __lock_acquire (kernel/locking/lockdep.c:5226) [ 34.680769][ T436] ? find_held_lock (kernel/locking/lockdep.c:5339) [ 34.680928][ T436] ? __lock_release (kernel/locking/lockdep.c:5525) [ 34.681088][ T436] ? __virt_addr_valid (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:962 ./include/linux/mmzone.h:2058 arch/x86/mm/physaddr.c:65) [ 34.681249][ T436] ? __pfx___lock_release (kernel/locking/lockdep.c:5501) [ 34.681411][ T436] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814) [ 34.681572][ T436] __sys_sendmsg (net/socket.c:2680) [ 34.681729][ T436] ? __pfx___sys_sendmsg (net/socket.c:2665) [ 34.681886][ T436] ? __pfx_slab_free_after_rcu_debug (mm/slub.c:4643) [ 34.682086][ T436] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) [ 34.682245][ T436] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) [ 34.682441][ T436] RIP: 0033:0x7fc53d4fb9a7 [ 34.682600][ T436] Code: 0a 00 f7 d8 64 89 02 48 c7 c0 ff ff ff ff eb b9 0f 1f 00 f3 0f 1e fa 64 8b 04 25 18 00 00 00 85 c0 75 10 b8 2e 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 51 c3 48 83 ec 28 89 54 24 1c 48 89 74 24 10 All code ======== 0: 0a 00 or (%rax),%al 2: f7 d8 neg %eax 4: 64 89 02 mov %eax,%fs:(%rdx) 7: 48 c7 c0 ff ff ff ff mov $0xffffffffffffffff,%rax e: eb b9 jmp 0xffffffffffffffc9 10: 0f 1f 00 nopl (%rax) 13: f3 0f 1e fa endbr64 17: 64 8b 04 25 18 00 00 mov %fs:0x18,%eax 1e: 00 1f: 85 c0 test %eax,%eax 21: 75 10 jne 0x33 23: b8 2e 00 00 00 mov $0x2e,%eax 28: 0f 05 syscall 2a:* 48 3d 00 f0 ff ff cmp $0xfffffffffffff000,%rax <-- trapping instruction 30: 77 51 ja 0x83 32: c3 ret 33: 48 83 ec 28 sub $0x28,%rsp 37: 89 54 24 1c mov %edx,0x1c(%rsp) 3b: 48 89 74 24 10 mov %rsi,0x10(%rsp) Code starting with the faulting instruction =========================================== 0: 48 3d 00 f0 ff ff cmp $0xfffffffffffff000,%rax 6: 77 51 ja 0x59 8: c3 ret 9: 48 83 ec 28 sub $0x28,%rsp d: 89 54 24 1c mov %edx,0x1c(%rsp) 11: 48 89 74 24 10 mov %rsi,0x10(%rsp) [ 34.683110][ T436] RSP: 002b:00007ffc76361c28 EFLAGS: 00000246 ORIG_RAX: 000000000000002e [ 34.683326][ T436] RAX: ffffffffffffffda RBX: 00007ffc76362350 RCX: 00007fc53d4fb9a7 [ 34.683545][ T436] RDX: 0000000000000000 RSI: 00007ffc76361c90 RDI: 0000000000000005 [ 34.683758][ T436] RBP: 0000000000000002 R08: 0000000000000003 R09: 0000000000000078 [ 34.683975][ T436] R10: 00007fc53d3b9ef8 R11: 0000000000000246 R12: 0000000000000002 Finger prints: print_deadlock_bug:validate_chain:__lock_acquire:down_read:blocking_notifier_call_chain