====================================== | [674.462624][T21953] #0: ffffffff9bbe7a48 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_dellink (net/core/rtnetlink.c:3521) | [674.462894][T21953] #1: ffffffff9bbd6630 ((netdev_chain).rwsem){++++}-{4:4}, at: blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368) | [ 674.463189][T21953] | [ 674.463189][T21953] stack backtrace: [ 674.463616][T21953] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 674.463800][T21953] Call Trace: [ 674.463915][T21953] [674.463992][T21953] dump_stack_lvl (lib/dump_stack.c:123) [674.464162][T21953] print_deadlock_bug (kernel/locking/lockdep.c:3040) [674.464313][T21953] validate_chain (kernel/locking/lockdep.c:3894) [674.464478][T21953] ? __pfx_validate_chain (kernel/locking/lockdep.c:3860) [674.464649][T21953] ? 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) [674.464798][T21953] ? mark_lock (kernel/locking/lockdep.c:4727 (discriminator 3)) [674.464913][T21953] __lock_acquire (kernel/locking/lockdep.c:5226) [674.465064][T21953] lock_acquire.part.0 (kernel/locking/lockdep.c:467 kernel/locking/lockdep.c:5851) [674.465209][T21953] ? blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368) [674.465396][T21953] ? netconsole_process_cleanups_core (drivers/net/netconsole.c:242 (discriminator 11)) [674.465615][T21953] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814) [674.465770][T21953] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 37)) [674.465919][T21953] ? lock_acquire (kernel/locking/lockdep.c:5822) [674.466065][T21953] ? blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368) [674.466249][T21953] down_read (./arch/x86/include/asm/preempt.h:79 kernel/locking/rwsem.c:1246 kernel/locking/rwsem.c:1261 kernel/locking/rwsem.c:1526) [674.466363][T21953] ? blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368) [674.466550][T21953] ? __pfx_down_read (kernel/locking/rwsem.c:1522) [674.466700][T21953] ? __lock_release (kernel/locking/lockdep.c:5525) [674.466851][T21953] ? netconsole_netdev_event (drivers/net/netconsole.c:1082) [674.466999][T21953] ? __pfx___lock_release (kernel/locking/lockdep.c:5501) [674.467151][T21953] blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368) [674.467308][T21953] __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)) [674.467463][T21953] ? __pfx___netdev_upper_dev_unlink (net/core/dev.c:8151) [674.467645][T21953] ? __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) [674.467803][T21953] ? __pfx___mutex_unlock_slowpath (kernel/locking/mutex.c:890) [674.467991][T21953] ? rtnl_is_locked (net/core/rtnetlink.c:163) [674.468168][T21953] netdev_upper_dev_unlink (net/core/dev.c:8190) [674.468317][T21953] ? __pfx_netdev_upper_dev_unlink (net/core/dev.c:8190) [674.468506][T21953] ? netconsole_netdev_event (drivers/net/netconsole.c:1082) [674.468676][T21953] ? 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) [674.468822][T21953] ? rtnl_is_locked (net/core/rtnetlink.c:163) [674.468997][T21953] ? netdev_master_upper_dev_get (net/core/dev.c:7230) [674.469181][T21953] vrf_device_event (drivers/net/vrf.c:1110 drivers/net/vrf.c:1119 drivers/net/vrf.c:1804) vrf [674.469331][T21953] notifier_call_chain (kernel/notifier.c:85 (discriminator 2)) [674.469477][T21953] blocking_notifier_call_chain (kernel/notifier.c:381 kernel/notifier.c:368) [674.469654][T21953] unregister_netdevice_many_notify (net/core/dev.c:11575) [674.469836][T21953] ? 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) [674.470002][T21953] ? mark_lock (kernel/locking/lockdep.c:4727 (discriminator 3)) [674.470153][T21953] ? __pfx_unregister_netdevice_many_notify (net/core/dev.c:11516) [674.470367][T21953] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4347 kernel/locking/lockdep.c:4406) [674.470588][T21953] ? kfree (mm/slub.c:4613 mm/slub.c:4761) [674.470750][T21953] ? vlan_vid_del (net/8021q/vlan_core.c:368 net/8021q/vlan_core.c:387) [674.470908][T21953] ? vlan_vid_del (net/8021q/vlan_core.c:368 net/8021q/vlan_core.c:387) [674.471104][T21953] rtnl_dellink (net/core/rtnetlink.c:3487 net/core/rtnetlink.c:3527) [674.471277][T21953] ? __pfx_rtnl_dellink (net/core/rtnetlink.c:3493) [674.471479][T21953] ? find_held_lock (kernel/locking/lockdep.c:5339) [674.471677][T21953] ? __lock_release (kernel/locking/lockdep.c:5525) [674.471824][T21953] ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/core/rtnetlink.c:6909) [674.472005][T21953] ? __pfx___lock_release (kernel/locking/lockdep.c:5501) [674.472178][T21953] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814) [674.472342][T21953] ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/core/rtnetlink.c:6909) [674.472528][T21953] ? __pfx_rtnl_dellink (net/core/rtnetlink.c:3493) [674.472685][T21953] rtnetlink_rcv_msg (net/core/rtnetlink.c:6911) [674.472869][T21953] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6814) [674.473027][T21953] ? 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) [674.473195][T21953] ? mark_lock (kernel/locking/lockdep.c:4727 (discriminator 3)) [674.473340][T21953] ? __lock_acquire (kernel/locking/lockdep.c:5226) [674.473517][T21953] netlink_rcv_skb (net/netlink/af_netlink.c:2543) [674.473726][T21953] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6814) [674.473902][T21953] ? __pfx_netlink_rcv_skb (net/netlink/af_netlink.c:2520) [674.474114][T21953] ? netlink_deliver_tap (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/netlink/af_netlink.c:340) [674.474302][T21953] ? 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) [674.474481][T21953] netlink_unicast (net/netlink/af_netlink.c:1322 net/netlink/af_netlink.c:1348) [674.474647][T21953] ? __pfx_netlink_unicast (net/netlink/af_netlink.c:1333) [674.474795][T21953] ? find_held_lock (kernel/locking/lockdep.c:5339) [674.474972][T21953] netlink_sendmsg (net/netlink/af_netlink.c:1892) [674.475132][T21953] ? __pfx_netlink_sendmsg (net/netlink/af_netlink.c:1811) [674.475321][T21953] ____sys_sendmsg (net/socket.c:711 net/socket.c:726 net/socket.c:2594) [674.475484][T21953] ? __pfx_____sys_sendmsg (net/socket.c:2540) [674.475676][T21953] ? __pfx_copy_msghdr_from_user (net/socket.c:2520) [674.475922][T21953] ___sys_sendmsg (net/socket.c:2650) [674.476078][T21953] ? __pfx____sys_sendmsg (net/socket.c:2637) [674.476252][T21953] ? kasan_save_stack (mm/kasan/common.c:49) [674.476431][T21953] ? kasan_save_stack (mm/kasan/common.c:48) [674.476611][T21953] ? __kasan_record_aux_stack (mm/kasan/generic.c:544) [674.476801][T21953] ? __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) [674.477018][T21953] ? __x64_sys_close (fs/open.c:1557 fs/open.c:1539 fs/open.c:1539) [674.477178][T21953] ? do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) [674.477358][T21953] ? entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) [674.477588][T21953] ? __lock_acquire (kernel/locking/lockdep.c:5226) [674.477760][T21953] ? find_held_lock (kernel/locking/lockdep.c:5339) [674.477953][T21953] ? __lock_release (kernel/locking/lockdep.c:5525) [674.478098][T21953] ? __virt_addr_valid (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:962 ./include/linux/mmzone.h:2058 arch/x86/mm/physaddr.c:65) [674.478285][T21953] ? __pfx___lock_release (kernel/locking/lockdep.c:5501) [674.478439][T21953] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814) [674.478656][T21953] __sys_sendmsg (net/socket.c:2680) [674.478803][T21953] ? __pfx___sys_sendmsg (net/socket.c:2665) [674.478988][T21953] ? __pfx_slab_free_after_rcu_debug (mm/slub.c:4643) [674.479225][T21953] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) [674.479374][T21953] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) [ 674.479596][T21953] RIP: 0033:0x7ff3396cf9a7 [ 674.479788][T21953] 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) [ 674.480347][T21953] RSP: 002b:00007fffef4ff648 EFLAGS: 00000246 ORIG_RAX: 000000000000002e [ 674.480595][T21953] RAX: ffffffffffffffda RBX: 00007fffef4ffd70 RCX: 00007ff3396cf9a7 [ 674.480863][T21953] RDX: 0000000000000000 RSI: 00007fffef4ff6b0 RDI: 0000000000000005 [ 674.481103][T21953] RBP: 0000000000000002 R08: 0000000000000003 R09: 0000000000000078 [ 674.481328][T21953] R10: 00007ff33958def8 R11: 0000000000000246 R12: 0000000000000002 Finger prints: print_deadlock_bug:validate_chain:__lock_acquire:down_read:blocking_notifier_call_chain