====================================== | [ 49.232301][ T637] #0: ffffffff9e1e7a48 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_dellink (net/core/rtnetlink.c:3521) | [ 49.232620][ T637] #1: ffffffff9e1d6630 ((netdev_chain).rwsem){++++}-{4:4}, at: blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368) | [ 49.233017][ T637] | [ 49.233017][ T637] stack backtrace: [ 49.233470][ T637] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 49.233679][ T637] Call Trace: [ 49.233805][ T637] [ 49.233899][ T637] dump_stack_lvl (lib/dump_stack.c:123) [ 49.234077][ T637] print_deadlock_bug (kernel/locking/lockdep.c:3040) [ 49.234265][ T637] validate_chain (kernel/locking/lockdep.c:3894) [ 49.234437][ T637] ? __pfx_validate_chain (kernel/locking/lockdep.c:3860) [ 49.234613][ T637] ? 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) [ 49.234789][ T637] ? mark_lock (kernel/locking/lockdep.c:4727 (discriminator 3)) [ 49.234919][ T637] __lock_acquire (kernel/locking/lockdep.c:5226) [ 49.235095][ T637] lock_acquire.part.0 (kernel/locking/lockdep.c:467 kernel/locking/lockdep.c:5851) [ 49.235279][ T637] ? blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368) [ 49.235510][ T637] ? netconsole_process_cleanups_core (drivers/net/netconsole.c:242 (discriminator 11)) [ 49.235760][ T637] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814) [ 49.235969][ T637] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 37)) [ 49.236167][ T637] ? lock_acquire (kernel/locking/lockdep.c:5822) [ 49.236364][ T637] ? blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368) [ 49.236603][ T637] down_read (./arch/x86/include/asm/preempt.h:79 kernel/locking/rwsem.c:1246 kernel/locking/rwsem.c:1261 kernel/locking/rwsem.c:1526) [ 49.236754][ T637] ? blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368) [ 49.236998][ T637] ? __pfx_down_read (kernel/locking/rwsem.c:1522) [ 49.237190][ T637] ? __lock_release (kernel/locking/lockdep.c:5525) [ 49.237378][ T637] ? netconsole_netdev_event (drivers/net/netconsole.c:1082) [ 49.237574][ T637] ? __pfx___lock_release (kernel/locking/lockdep.c:5501) [ 49.237771][ T637] blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368) [ 49.237946][ T637] __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)) [ 49.238131][ T637] ? __pfx___netdev_upper_dev_unlink (net/core/dev.c:8151) [ 49.238364][ T637] ? __mutex_unlock_slowpath (./arch/x86/include/asm/atomic64_64.h:101 ./include/linux/atomic/atomic-arch-fallback.h:4329 ./include/linux/atomic/atomic-long.h:1506 ./include/linux/atomic/atomic-instrumented.h:4481 kernel/locking/mutex.c:913) [ 49.238546][ T637] ? __pfx___mutex_unlock_slowpath (kernel/locking/mutex.c:890) [ 49.238770][ T637] ? rtnl_is_locked (net/core/rtnetlink.c:163) [ 49.238962][ T637] netdev_upper_dev_unlink (net/core/dev.c:8190) [ 49.239134][ T637] ? __pfx_netdev_upper_dev_unlink (net/core/dev.c:8190) [ 49.239369][ T637] ? netconsole_netdev_event (drivers/net/netconsole.c:1082) [ 49.239559][ T637] ? 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) [ 49.239752][ T637] ? rtnl_is_locked (net/core/rtnetlink.c:163) [ 49.239936][ T637] ? netdev_master_upper_dev_get (net/core/dev.c:7230) [ 49.240179][ T637] vrf_device_event (drivers/net/vrf.c:1110 drivers/net/vrf.c:1119 drivers/net/vrf.c:1804) vrf [ 49.240345][ T637] notifier_call_chain (kernel/notifier.c:85 (discriminator 2)) [ 49.240516][ T637] blocking_notifier_call_chain (kernel/notifier.c:381 kernel/notifier.c:368) [ 49.240684][ T637] unregister_netdevice_many_notify (net/core/dev.c:11575) [ 49.240913][ T637] ? 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) [ 49.241096][ T637] ? mark_lock (kernel/locking/lockdep.c:4727 (discriminator 3)) [ 49.241228][ T637] ? __pfx_unregister_netdevice_many_notify (net/core/dev.c:11516) [ 49.241433][ T637] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4347 kernel/locking/lockdep.c:4406) [ 49.241642][ T637] ? kfree (mm/slub.c:4613 mm/slub.c:4761) [ 49.241764][ T637] ? vlan_vid_del (net/8021q/vlan_core.c:368 net/8021q/vlan_core.c:387) [ 49.241936][ T637] ? vlan_vid_del (net/8021q/vlan_core.c:368 net/8021q/vlan_core.c:387) [ 49.242097][ T637] rtnl_dellink (net/core/rtnetlink.c:3487 net/core/rtnetlink.c:3527) [ 49.242273][ T637] ? __pfx_rtnl_dellink (net/core/rtnetlink.c:3493) [ 49.242446][ T637] ? find_held_lock (kernel/locking/lockdep.c:5339) [ 49.242606][ T637] ? __lock_release (kernel/locking/lockdep.c:5525) [ 49.242762][ T637] ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/core/rtnetlink.c:6909) [ 49.242920][ T637] ? __pfx___lock_release (kernel/locking/lockdep.c:5501) [ 49.243087][ T637] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814) [ 49.243245][ T637] ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/core/rtnetlink.c:6909) [ 49.243404][ T637] ? __pfx_rtnl_dellink (net/core/rtnetlink.c:3493) [ 49.243571][ T637] rtnetlink_rcv_msg (net/core/rtnetlink.c:6911) [ 49.243728][ T637] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6814) [ 49.243892][ T637] ? 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) [ 49.244044][ T637] ? mark_lock (kernel/locking/lockdep.c:4727 (discriminator 3)) [ 49.244179][ T637] ? __lock_acquire (kernel/locking/lockdep.c:5226) [ 49.244359][ T637] netlink_rcv_skb (net/netlink/af_netlink.c:2543) [ 49.244530][ T637] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6814) [ 49.244717][ T637] ? __pfx_netlink_rcv_skb (net/netlink/af_netlink.c:2520) [ 49.244910][ T637] ? netlink_deliver_tap (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/netlink/af_netlink.c:340) [ 49.245079][ T637] ? 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) [ 49.245236][ T637] netlink_unicast (net/netlink/af_netlink.c:1322 net/netlink/af_netlink.c:1348) [ 49.245392][ T637] ? __pfx_netlink_unicast (net/netlink/af_netlink.c:1333) [ 49.245548][ T637] ? find_held_lock (kernel/locking/lockdep.c:5339) [ 49.245717][ T637] netlink_sendmsg (net/netlink/af_netlink.c:1892) [ 49.245902][ T637] ? __pfx_netlink_sendmsg (net/netlink/af_netlink.c:1811) [ 49.246088][ T637] ____sys_sendmsg (net/socket.c:711 net/socket.c:726 net/socket.c:2594) [ 49.246269][ T637] ? __pfx_____sys_sendmsg (net/socket.c:2540) [ 49.246437][ T637] ? __pfx_copy_msghdr_from_user (net/socket.c:2520) [ 49.246643][ T637] ___sys_sendmsg (net/socket.c:2650) [ 49.246815][ T637] ? __pfx____sys_sendmsg (net/socket.c:2637) [ 49.246998][ T637] ? kasan_save_stack (mm/kasan/common.c:49) [ 49.247174][ T637] ? kasan_save_stack (mm/kasan/common.c:48) [ 49.247349][ T637] ? __kasan_record_aux_stack (mm/kasan/generic.c:544) [ 49.247537][ T637] ? __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) [ 49.247777][ T637] ? __x64_sys_close (fs/open.c:1557 fs/open.c:1539 fs/open.c:1539) [ 49.247968][ T637] ? do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) [ 49.248162][ T637] ? entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) [ 49.248401][ T637] ? __lock_acquire (kernel/locking/lockdep.c:5226) [ 49.248609][ T637] ? find_held_lock (kernel/locking/lockdep.c:5339) [ 49.248803][ T637] ? __lock_release (kernel/locking/lockdep.c:5525) [ 49.248979][ T637] ? __virt_addr_valid (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:962 ./include/linux/mmzone.h:2058 arch/x86/mm/physaddr.c:65) [ 49.249161][ T637] ? __pfx___lock_release (kernel/locking/lockdep.c:5501) [ 49.249340][ T637] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814) [ 49.249524][ T637] __sys_sendmsg (net/socket.c:2680) [ 49.249704][ T637] ? __pfx___sys_sendmsg (net/socket.c:2665) [ 49.249898][ T637] ? __pfx_slab_free_after_rcu_debug (mm/slub.c:4643) [ 49.250134][ T637] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) [ 49.250310][ T637] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) [ 49.250526][ T637] RIP: 0033:0x7f0a673599a7 [ 49.250717][ T637] 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) [ 49.251363][ T637] RSP: 002b:00007ffc064783d8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e [ 49.251635][ T637] RAX: ffffffffffffffda RBX: 00007ffc06478b00 RCX: 00007f0a673599a7 [ 49.251911][ T637] RDX: 0000000000000000 RSI: 00007ffc06478440 RDI: 0000000000000005 [ 49.252173][ T637] RBP: 0000000000000002 R08: 0000000000000003 R09: 0000000000000078 [ 49.252456][ T637] R10: 00007f0a67217ef8 R11: 0000000000000246 R12: 0000000000000002 Finger prints: print_deadlock_bug:validate_chain:__lock_acquire:down_read:blocking_notifier_call_chain