====================================== | [822.525536][T10877] #0: ffffffff997e7a48 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_dellink (net/core/rtnetlink.c:3521) | [822.525815][T10877] #1: ffffffff997d6630 ((netdev_chain).rwsem){++++}-{4:4}, at: blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368) | [ 822.526132][T10877] | [ 822.526132][T10877] stack backtrace: [ 822.526549][T10877] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 822.526741][T10877] Call Trace: [ 822.526861][T10877] [822.526956][T10877] dump_stack_lvl (lib/dump_stack.c:123) [822.527114][T10877] print_deadlock_bug (kernel/locking/lockdep.c:3040) [822.527266][T10877] validate_chain (kernel/locking/lockdep.c:3894) [822.527416][T10877] ? __pfx_validate_chain (kernel/locking/lockdep.c:3860) [822.527570][T10877] ? 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) [822.527722][T10877] ? mark_lock (kernel/locking/lockdep.c:4727 (discriminator 3)) [822.527837][T10877] __lock_acquire (kernel/locking/lockdep.c:5226) [822.527998][T10877] lock_acquire.part.0 (kernel/locking/lockdep.c:467 kernel/locking/lockdep.c:5851) [822.528147][T10877] ? blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368) [822.528332][T10877] ? netconsole_process_cleanups_core (drivers/net/netconsole.c:242 (discriminator 11)) [822.528530][T10877] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814) [822.528686][T10877] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 37)) [822.528839][T10877] ? lock_acquire (kernel/locking/lockdep.c:5822) [822.528999][T10877] ? blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368) [822.529185][T10877] down_read (./arch/x86/include/asm/preempt.h:79 kernel/locking/rwsem.c:1246 kernel/locking/rwsem.c:1261 kernel/locking/rwsem.c:1526) [822.529304][T10877] ? blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368) [822.529492][T10877] ? __pfx_down_read (kernel/locking/rwsem.c:1522) [822.529641][T10877] ? __lock_release (kernel/locking/lockdep.c:5525) [822.529844][T10877] ? netconsole_netdev_event (drivers/net/netconsole.c:1082) [822.530090][T10877] ? __pfx___lock_release (kernel/locking/lockdep.c:5501) [822.530348][T10877] blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368) [822.530602][T10877] __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)) [822.530853][T10877] ? __pfx___netdev_upper_dev_unlink (net/core/dev.c:8151) [822.531164][T10877] ? __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) [822.531414][T10877] ? __pfx___mutex_unlock_slowpath (kernel/locking/mutex.c:890) [822.531714][T10877] ? rtnl_is_locked (net/core/rtnetlink.c:163) [822.531966][T10877] netdev_upper_dev_unlink (net/core/dev.c:8190) [822.532219][T10877] ? __pfx_netdev_upper_dev_unlink (net/core/dev.c:8190) [822.532516][T10877] ? netconsole_netdev_event (drivers/net/netconsole.c:1082) [822.532758][T10877] ? 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) [822.532999][T10877] ? rtnl_is_locked (net/core/rtnetlink.c:163) [822.533236][T10877] ? netdev_master_upper_dev_get (net/core/dev.c:7230) [822.533533][T10877] vrf_device_event (drivers/net/vrf.c:1110 drivers/net/vrf.c:1119 drivers/net/vrf.c:1804) vrf [822.533783][T10877] notifier_call_chain (kernel/notifier.c:85 (discriminator 2)) [822.534024][T10877] blocking_notifier_call_chain (kernel/notifier.c:381 kernel/notifier.c:368) [822.534263][T10877] unregister_netdevice_many_notify (net/core/dev.c:11575) [822.534563][T10877] ? 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) [822.534804][T10877] ? mark_lock (kernel/locking/lockdep.c:4727 (discriminator 3)) [822.534989][T10877] ? __pfx_unregister_netdevice_many_notify (net/core/dev.c:11516) [822.535294][T10877] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4347 kernel/locking/lockdep.c:4406) [822.535596][T10877] ? kfree (mm/slub.c:4613 mm/slub.c:4761) [822.535781][T10877] ? vlan_vid_del (net/8021q/vlan_core.c:368 net/8021q/vlan_core.c:387) [822.536033][T10877] ? vlan_vid_del (net/8021q/vlan_core.c:368 net/8021q/vlan_core.c:387) [822.536282][T10877] rtnl_dellink (net/core/rtnetlink.c:3487 net/core/rtnetlink.c:3527) [822.536528][T10877] ? __pfx_rtnl_dellink (net/core/rtnetlink.c:3493) [822.536796][T10877] ? find_held_lock (kernel/locking/lockdep.c:5339) [822.537041][T10877] ? __lock_release (kernel/locking/lockdep.c:5525) [822.537291][T10877] ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/core/rtnetlink.c:6909) [822.537536][T10877] ? __pfx___lock_release (kernel/locking/lockdep.c:5501) [822.537775][T10877] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814) [822.538027][T10877] ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/core/rtnetlink.c:6909) [822.538273][T10877] ? __pfx_rtnl_dellink (net/core/rtnetlink.c:3493) [822.538516][T10877] rtnetlink_rcv_msg (net/core/rtnetlink.c:6911) [822.538760][T10877] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6814) [822.538999][T10877] ? 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) [822.539239][T10877] ? mark_lock (kernel/locking/lockdep.c:4727 (discriminator 3)) [822.539425][T10877] ? __lock_acquire (kernel/locking/lockdep.c:5226) [822.539668][T10877] netlink_rcv_skb (net/netlink/af_netlink.c:2543) [822.539907][T10877] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6814) [822.540162][T10877] ? __pfx_netlink_rcv_skb (net/netlink/af_netlink.c:2520) [822.540428][T10877] ? netlink_deliver_tap (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/netlink/af_netlink.c:340) [822.540670][T10877] ? 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) [822.540909][T10877] netlink_unicast (net/netlink/af_netlink.c:1322 net/netlink/af_netlink.c:1348) [822.541152][T10877] ? __pfx_netlink_unicast (net/netlink/af_netlink.c:1333) [822.541392][T10877] ? find_held_lock (kernel/locking/lockdep.c:5339) [822.541634][T10877] netlink_sendmsg (net/netlink/af_netlink.c:1892) [822.541880][T10877] ? __pfx_netlink_sendmsg (net/netlink/af_netlink.c:1811) [822.542123][T10877] ____sys_sendmsg (net/socket.c:711 net/socket.c:726 net/socket.c:2594) [822.542363][T10877] ? __pfx_____sys_sendmsg (net/socket.c:2540) [822.542601][T10877] ? __pfx_copy_msghdr_from_user (net/socket.c:2520) [822.542907][T10877] ___sys_sendmsg (net/socket.c:2650) [822.543147][T10877] ? __pfx____sys_sendmsg (net/socket.c:2637) [822.543386][T10877] ? kasan_save_stack (mm/kasan/common.c:49) [822.543632][T10877] ? kasan_save_stack (mm/kasan/common.c:48) [822.543869][T10877] ? __kasan_record_aux_stack (mm/kasan/generic.c:544) [822.544110][T10877] ? __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) [822.544405][T10877] ? __x64_sys_close (fs/open.c:1557 fs/open.c:1539 fs/open.c:1539) [822.544643][T10877] ? do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) [822.544883][T10877] ? entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) [822.545184][T10877] ? __lock_acquire (kernel/locking/lockdep.c:5226) [822.545434][T10877] ? find_held_lock (kernel/locking/lockdep.c:5339) [822.545675][T10877] ? __lock_release (kernel/locking/lockdep.c:5525) [822.545913][T10877] ? __virt_addr_valid (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:962 ./include/linux/mmzone.h:2058 arch/x86/mm/physaddr.c:65) [822.546156][T10877] ? __pfx___lock_release (kernel/locking/lockdep.c:5501) [822.546392][T10877] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814) [822.546632][T10877] __sys_sendmsg (net/socket.c:2680) [822.546870][T10877] ? __pfx___sys_sendmsg (net/socket.c:2665) [822.547115][T10877] ? __pfx_slab_free_after_rcu_debug (mm/slub.c:4643) [822.547420][T10877] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) [822.547656][T10877] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) [ 822.547951][T10877] RIP: 0033:0x7f8467e719a7 [ 822.548204][T10877] 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) [ 822.549060][T10877] RSP: 002b:00007ffc74d0fa48 EFLAGS: 00000246 ORIG_RAX: 000000000000002e [ 822.549420][T10877] RAX: ffffffffffffffda RBX: 00007ffc74d10170 RCX: 00007f8467e719a7 [ 822.549777][T10877] RDX: 0000000000000000 RSI: 00007ffc74d0fab0 RDI: 0000000000000005 [ 822.550134][T10877] RBP: 0000000000000002 R08: 0000000000000003 R09: 0000000000000078 [ 822.550511][T10877] R10: 00007f8467d2fef8 R11: 0000000000000246 R12: 0000000000000002 Finger prints: print_deadlock_bug:validate_chain:__lock_acquire:down_read:blocking_notifier_call_chain