====================================== | [ 138.413480][ T804] #0: ffffffff8e7e7a48 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_dellink (net/core/rtnetlink.c:3521) | [ 138.413766][ T804] #1: ffffffff8e7d6630 ((netdev_chain).rwsem){++++}-{4:4}, at: blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368) | [ 138.414077][ T804] | [ 138.414077][ T804] stack backtrace: [ 138.414501][ T804] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 138.414715][ T804] Call Trace: [ 138.414835][ T804] [ 138.414916][ T804] dump_stack_lvl (lib/dump_stack.c:123) [ 138.415079][ T804] print_deadlock_bug (kernel/locking/lockdep.c:3040) [ 138.415237][ T804] validate_chain (kernel/locking/lockdep.c:3894) [ 138.415390][ T804] ? __pfx_validate_chain (kernel/locking/lockdep.c:3860) [ 138.415556][ T804] ? 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) [ 138.415707][ T804] ? mark_lock (kernel/locking/lockdep.c:4727 (discriminator 3)) [ 138.415823][ T804] __lock_acquire (kernel/locking/lockdep.c:5226) [ 138.415978][ T804] lock_acquire.part.0 (kernel/locking/lockdep.c:467 kernel/locking/lockdep.c:5851) [ 138.416133][ T804] ? blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368) [ 138.416321][ T804] ? netconsole_process_cleanups_core (drivers/net/netconsole.c:242 (discriminator 11)) [ 138.416515][ T804] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814) [ 138.416665][ T804] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 37)) [ 138.416824][ T804] ? lock_acquire (kernel/locking/lockdep.c:5822) [ 138.416976][ T804] ? blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368) [ 138.417161][ T804] down_read (./arch/x86/include/asm/preempt.h:79 kernel/locking/rwsem.c:1246 kernel/locking/rwsem.c:1261 kernel/locking/rwsem.c:1526) [ 138.417277][ T804] ? blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368) [ 138.417508][ T804] ? __pfx_down_read (kernel/locking/rwsem.c:1522) [ 138.417658][ T804] ? __lock_release (kernel/locking/lockdep.c:5525) [ 138.417806][ T804] ? netconsole_netdev_event (drivers/net/netconsole.c:1082) [ 138.417963][ T804] ? __pfx___lock_release (kernel/locking/lockdep.c:5501) [ 138.418125][ T804] blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368) [ 138.418272][ T804] __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)) [ 138.418431][ T804] ? __pfx___netdev_upper_dev_unlink (net/core/dev.c:8151) [ 138.418623][ T804] ? __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) [ 138.418772][ T804] ? __pfx___mutex_unlock_slowpath (kernel/locking/mutex.c:890) [ 138.418956][ T804] ? rtnl_is_locked (net/core/rtnetlink.c:163) [ 138.419110][ T804] netdev_upper_dev_unlink (net/core/dev.c:8190) [ 138.419267][ T804] ? __pfx_netdev_upper_dev_unlink (net/core/dev.c:8190) [ 138.419461][ T804] ? netconsole_netdev_event (drivers/net/netconsole.c:1082) [ 138.419612][ T804] ? 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) [ 138.419761][ T804] ? rtnl_is_locked (net/core/rtnetlink.c:163) [ 138.419911][ T804] ? netdev_master_upper_dev_get (net/core/dev.c:7230) [ 138.420098][ T804] vrf_device_event (drivers/net/vrf.c:1110 drivers/net/vrf.c:1119 drivers/net/vrf.c:1804) vrf [ 138.420252][ T804] notifier_call_chain (kernel/notifier.c:85 (discriminator 2)) [ 138.420406][ T804] blocking_notifier_call_chain (kernel/notifier.c:381 kernel/notifier.c:368) [ 138.420565][ T804] unregister_netdevice_many_notify (net/core/dev.c:11575) [ 138.420750][ T804] ? 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) [ 138.420901][ T804] ? mark_lock (kernel/locking/lockdep.c:4727 (discriminator 3)) [ 138.421014][ T804] ? __pfx_unregister_netdevice_many_notify (net/core/dev.c:11516) [ 138.421202][ T804] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4347 kernel/locking/lockdep.c:4406) [ 138.421432][ T804] ? kfree (mm/slub.c:4613 mm/slub.c:4761) [ 138.421564][ T804] ? vlan_vid_del (net/8021q/vlan_core.c:368 net/8021q/vlan_core.c:387) [ 138.421721][ T804] ? vlan_vid_del (net/8021q/vlan_core.c:368 net/8021q/vlan_core.c:387) [ 138.421870][ T804] rtnl_dellink (net/core/rtnetlink.c:3487 net/core/rtnetlink.c:3527) [ 138.422020][ T804] ? __pfx_rtnl_dellink (net/core/rtnetlink.c:3493) [ 138.422183][ T804] ? find_held_lock (kernel/locking/lockdep.c:5339) [ 138.422333][ T804] ? __lock_release (kernel/locking/lockdep.c:5525) [ 138.422492][ T804] ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/core/rtnetlink.c:6909) [ 138.422648][ T804] ? __pfx___lock_release (kernel/locking/lockdep.c:5501) [ 138.422795][ T804] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814) [ 138.422944][ T804] ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/core/rtnetlink.c:6909) [ 138.423091][ T804] ? __pfx_rtnl_dellink (net/core/rtnetlink.c:3493) [ 138.423245][ T804] rtnetlink_rcv_msg (net/core/rtnetlink.c:6911) [ 138.423398][ T804] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6814) [ 138.423555][ T804] ? 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) [ 138.423704][ T804] ? mark_lock (kernel/locking/lockdep.c:4727 (discriminator 3)) [ 138.423816][ T804] ? __lock_acquire (kernel/locking/lockdep.c:5226) [ 138.423966][ T804] netlink_rcv_skb (net/netlink/af_netlink.c:2543) [ 138.424114][ T804] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6814) [ 138.424264][ T804] ? __pfx_netlink_rcv_skb (net/netlink/af_netlink.c:2520) [ 138.424420][ T804] ? netlink_deliver_tap (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/netlink/af_netlink.c:340) [ 138.424581][ T804] ? 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) [ 138.424752][ T804] netlink_unicast (net/netlink/af_netlink.c:1322 net/netlink/af_netlink.c:1348) [ 138.424900][ T804] ? __pfx_netlink_unicast (net/netlink/af_netlink.c:1333) [ 138.425046][ T804] ? find_held_lock (kernel/locking/lockdep.c:5339) [ 138.425197][ T804] netlink_sendmsg (net/netlink/af_netlink.c:1892) [ 138.425375][ T804] ? __pfx_netlink_sendmsg (net/netlink/af_netlink.c:1811) [ 138.425547][ T804] ____sys_sendmsg (net/socket.c:711 net/socket.c:726 net/socket.c:2594) [ 138.425703][ T804] ? __pfx_____sys_sendmsg (net/socket.c:2540) [ 138.425851][ T804] ? __pfx_copy_msghdr_from_user (net/socket.c:2520) [ 138.426052][ T804] ___sys_sendmsg (net/socket.c:2650) [ 138.426199][ T804] ? __pfx____sys_sendmsg (net/socket.c:2637) [ 138.426351][ T804] ? kasan_save_stack (mm/kasan/common.c:49) [ 138.426524][ T804] ? kasan_save_stack (mm/kasan/common.c:48) [ 138.426673][ T804] ? __kasan_record_aux_stack (mm/kasan/generic.c:544) [ 138.426821][ T804] ? __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) [ 138.427008][ T804] ? __x64_sys_close (fs/open.c:1557 fs/open.c:1539 fs/open.c:1539) [ 138.427162][ T804] ? do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) [ 138.427317][ T804] ? entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) [ 138.427594][ T804] ? __lock_acquire (kernel/locking/lockdep.c:5226) [ 138.427843][ T804] ? find_held_lock (kernel/locking/lockdep.c:5339) [ 138.428092][ T804] ? __lock_release (kernel/locking/lockdep.c:5525) [ 138.428326][ T804] ? __virt_addr_valid (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:962 ./include/linux/mmzone.h:2058 arch/x86/mm/physaddr.c:65) [ 138.428560][ T804] ? __pfx___lock_release (kernel/locking/lockdep.c:5501) [ 138.428810][ T804] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814) [ 138.429060][ T804] __sys_sendmsg (net/socket.c:2680) [ 138.429304][ T804] ? __pfx___sys_sendmsg (net/socket.c:2665) [ 138.429548][ T804] ? __pfx_slab_free_after_rcu_debug (mm/slub.c:4643) [ 138.429860][ T804] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) [ 138.430107][ T804] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) [ 138.430405][ T804] RIP: 0033:0x7fb54f66c9a7 [ 138.430676][ T804] 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) [ 138.431513][ T804] RSP: 002b:00007ffe2d446a58 EFLAGS: 00000246 ORIG_RAX: 000000000000002e [ 138.431877][ T804] RAX: ffffffffffffffda RBX: 00007ffe2d447180 RCX: 00007fb54f66c9a7 [ 138.432247][ T804] RDX: 0000000000000000 RSI: 00007ffe2d446ac0 RDI: 0000000000000005 [ 138.432602][ T804] RBP: 0000000000000002 R08: 0000000000000003 R09: 0000000000000078 [ 138.432963][ T804] R10: 00007fb54f52aef8 R11: 0000000000000246 R12: 0000000000000002 Finger prints: print_deadlock_bug:validate_chain:__lock_acquire:down_read:blocking_notifier_call_chain