====================================== | [ 53.576166][ T546] #0: ffffffffa5be7a48 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_dellink (net/core/rtnetlink.c:3521) | [ 53.576435][ T546] #1: ffffffffa5bd6630 ((netdev_chain).rwsem){++++}-{4:4}, at: blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368) | [ 53.576752][ T546] | [ 53.576752][ T546] stack backtrace: [ 53.577160][ T546] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 53.577361][ T546] Call Trace: [ 53.577477][ T546] [ 53.577561][ T546] dump_stack_lvl (lib/dump_stack.c:123) [ 53.577728][ T546] print_deadlock_bug (kernel/locking/lockdep.c:3040) [ 53.577874][ T546] validate_chain (kernel/locking/lockdep.c:3894) [ 53.578037][ T546] ? __pfx_validate_chain (kernel/locking/lockdep.c:3860) [ 53.578183][ T546] ? 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) [ 53.578329][ T546] ? mark_lock (kernel/locking/lockdep.c:4727 (discriminator 3)) [ 53.578441][ T546] __lock_acquire (kernel/locking/lockdep.c:5226) [ 53.578590][ T546] lock_acquire.part.0 (kernel/locking/lockdep.c:467 kernel/locking/lockdep.c:5851) [ 53.578740][ T546] ? blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368) [ 53.578918][ T546] ? netconsole_process_cleanups_core (drivers/net/netconsole.c:242 (discriminator 11)) [ 53.579102][ T546] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814) [ 53.579246][ T546] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 37)) [ 53.579391][ T546] ? lock_acquire (kernel/locking/lockdep.c:5822) [ 53.579535][ T546] ? blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368) [ 53.579717][ T546] down_read (./arch/x86/include/asm/preempt.h:79 kernel/locking/rwsem.c:1246 kernel/locking/rwsem.c:1261 kernel/locking/rwsem.c:1526) [ 53.579831][ T546] ? blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368) [ 53.580022][ T546] ? __pfx_down_read (kernel/locking/rwsem.c:1522) [ 53.580167][ T546] ? __lock_release (kernel/locking/lockdep.c:5525) [ 53.580314][ T546] ? netconsole_netdev_event (drivers/net/netconsole.c:1082) [ 53.580459][ T546] ? __pfx___lock_release (kernel/locking/lockdep.c:5501) [ 53.580607][ T546] blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368) [ 53.580754][ T546] __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)) [ 53.580907][ T546] ? __pfx___netdev_upper_dev_unlink (net/core/dev.c:8151) [ 53.581087][ T546] ? __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) [ 53.581234][ T546] ? __pfx___mutex_unlock_slowpath (kernel/locking/mutex.c:890) [ 53.581417][ T546] ? rtnl_is_locked (net/core/rtnetlink.c:163) [ 53.581566][ T546] netdev_upper_dev_unlink (net/core/dev.c:8190) [ 53.581711][ T546] ? __pfx_netdev_upper_dev_unlink (net/core/dev.c:8190) [ 53.581895][ T546] ? netconsole_netdev_event (drivers/net/netconsole.c:1082) [ 53.582044][ T546] ? 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) [ 53.582191][ T546] ? rtnl_is_locked (net/core/rtnetlink.c:163) [ 53.582338][ T546] ? netdev_master_upper_dev_get (net/core/dev.c:7230) [ 53.582518][ T546] vrf_device_event (drivers/net/vrf.c:1110 drivers/net/vrf.c:1119 drivers/net/vrf.c:1804) vrf [ 53.582670][ T546] notifier_call_chain (kernel/notifier.c:85 (discriminator 2)) [ 53.582817][ T546] blocking_notifier_call_chain (kernel/notifier.c:381 kernel/notifier.c:368) [ 53.582967][ T546] unregister_netdevice_many_notify (net/core/dev.c:11575) [ 53.583158][ T546] ? 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) [ 53.583306][ T546] ? mark_lock (kernel/locking/lockdep.c:4727 (discriminator 3)) [ 53.583417][ T546] ? __pfx_unregister_netdevice_many_notify (net/core/dev.c:11516) [ 53.583599][ T546] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4347 kernel/locking/lockdep.c:4406) [ 53.583782][ T546] ? kfree (mm/slub.c:4613 mm/slub.c:4761) [ 53.583895][ T546] ? vlan_vid_del (net/8021q/vlan_core.c:368 net/8021q/vlan_core.c:387) [ 53.584048][ T546] ? vlan_vid_del (net/8021q/vlan_core.c:368 net/8021q/vlan_core.c:387) [ 53.584194][ T546] rtnl_dellink (net/core/rtnetlink.c:3487 net/core/rtnetlink.c:3527) [ 53.584340][ T546] ? __pfx_rtnl_dellink (net/core/rtnetlink.c:3493) [ 53.584500][ T546] ? find_held_lock (kernel/locking/lockdep.c:5339) [ 53.584648][ T546] ? __lock_release (kernel/locking/lockdep.c:5525) [ 53.584791][ T546] ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/core/rtnetlink.c:6909) [ 53.584937][ T546] ? __pfx___lock_release (kernel/locking/lockdep.c:5501) [ 53.585082][ T546] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814) [ 53.585233][ T546] ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/core/rtnetlink.c:6909) [ 53.585377][ T546] ? __pfx_rtnl_dellink (net/core/rtnetlink.c:3493) [ 53.585522][ T546] rtnetlink_rcv_msg (net/core/rtnetlink.c:6911) [ 53.585668][ T546] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6814) [ 53.585814][ T546] ? 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) [ 53.585971][ T546] ? mark_lock (kernel/locking/lockdep.c:4727 (discriminator 3)) [ 53.586085][ T546] ? __lock_acquire (kernel/locking/lockdep.c:5226) [ 53.586245][ T546] netlink_rcv_skb (net/netlink/af_netlink.c:2543) [ 53.586389][ T546] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6814) [ 53.586552][ T546] ? __pfx_netlink_rcv_skb (net/netlink/af_netlink.c:2520) [ 53.586702][ T546] ? netlink_deliver_tap (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/netlink/af_netlink.c:340) [ 53.586849][ T546] ? 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) [ 53.586994][ T546] netlink_unicast (net/netlink/af_netlink.c:1322 net/netlink/af_netlink.c:1348) [ 53.587140][ T546] ? __pfx_netlink_unicast (net/netlink/af_netlink.c:1333) [ 53.587289][ T546] ? find_held_lock (kernel/locking/lockdep.c:5339) [ 53.587444][ T546] netlink_sendmsg (net/netlink/af_netlink.c:1892) [ 53.587590][ T546] ? __pfx_netlink_sendmsg (net/netlink/af_netlink.c:1811) [ 53.587736][ T546] ____sys_sendmsg (net/socket.c:711 net/socket.c:726 net/socket.c:2594) [ 53.587896][ T546] ? __pfx_____sys_sendmsg (net/socket.c:2540) [ 53.588045][ T546] ? __pfx_copy_msghdr_from_user (net/socket.c:2520) [ 53.588228][ T546] ___sys_sendmsg (net/socket.c:2650) [ 53.588383][ T546] ? __pfx____sys_sendmsg (net/socket.c:2637) [ 53.588529][ T546] ? kasan_save_stack (mm/kasan/common.c:49) [ 53.588675][ T546] ? kasan_save_stack (mm/kasan/common.c:48) [ 53.588817][ T546] ? __kasan_record_aux_stack (mm/kasan/generic.c:544) [ 53.588962][ T546] ? __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) [ 53.589145][ T546] ? __x64_sys_close (fs/open.c:1557 fs/open.c:1539 fs/open.c:1539) [ 53.589291][ T546] ? do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) [ 53.589436][ T546] ? entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) [ 53.589622][ T546] ? __lock_acquire (kernel/locking/lockdep.c:5226) [ 53.589771][ T546] ? find_held_lock (kernel/locking/lockdep.c:5339) [ 53.589916][ T546] ? __lock_release (kernel/locking/lockdep.c:5525) [ 53.590068][ T546] ? __virt_addr_valid (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:962 ./include/linux/mmzone.h:2058 arch/x86/mm/physaddr.c:65) [ 53.590213][ T546] ? __pfx___lock_release (kernel/locking/lockdep.c:5501) [ 53.590359][ T546] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814) [ 53.590505][ T546] __sys_sendmsg (net/socket.c:2680) [ 53.590653][ T546] ? __pfx___sys_sendmsg (net/socket.c:2665) [ 53.590800][ T546] ? __pfx_slab_free_after_rcu_debug (mm/slub.c:4643) [ 53.590985][ T546] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) [ 53.591130][ T546] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) [ 53.591310][ T546] RIP: 0033:0x7f931e9b69a7 [ 53.591464][ T546] 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) [ 53.591982][ T546] RSP: 002b:00007ffe4461dec8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e [ 53.592224][ T546] RAX: ffffffffffffffda RBX: 00007ffe4461e5f0 RCX: 00007f931e9b69a7 [ 53.592444][ T546] RDX: 0000000000000000 RSI: 00007ffe4461df30 RDI: 0000000000000005 [ 53.592669][ T546] RBP: 0000000000000002 R08: 0000000000000003 R09: 0000000000000078 [ 53.592887][ T546] R10: 00007f931e874ef8 R11: 0000000000000246 R12: 0000000000000002 Finger prints: print_deadlock_bug:validate_chain:__lock_acquire:down_read:blocking_notifier_call_chain