====================================== | [ 138.668353][ T802] #0: ffffffffa3be7a48 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_dellink (net/core/rtnetlink.c:3521) | [ 138.668679][ T802] #1: ffffffffa3bd6630 ((netdev_chain).rwsem){++++}-{4:4}, at: blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368) | [ 138.669043][ T802] | [ 138.669043][ T802] stack backtrace: [ 138.669552][ T802] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 138.669786][ T802] Call Trace: [ 138.669928][ T802] [ 138.670024][ T802] dump_stack_lvl (lib/dump_stack.c:123) [ 138.670214][ T802] print_deadlock_bug (kernel/locking/lockdep.c:3040) [ 138.670401][ T802] validate_chain (kernel/locking/lockdep.c:3894) [ 138.670584][ T802] ? __pfx_validate_chain (kernel/locking/lockdep.c:3860) [ 138.670769][ T802] ? 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) [ 138.670950][ T802] ? mark_lock (kernel/locking/lockdep.c:4727 (discriminator 3)) [ 138.671095][ T802] __lock_acquire (kernel/locking/lockdep.c:5226) [ 138.671281][ T802] lock_acquire.part.0 (kernel/locking/lockdep.c:467 kernel/locking/lockdep.c:5851) [ 138.671470][ T802] ? blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368) [ 138.671706][ T802] ? netconsole_process_cleanups_core (drivers/net/netconsole.c:242 (discriminator 11)) [ 138.671933][ T802] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814) [ 138.672135][ T802] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 37)) [ 138.672322][ T802] ? lock_acquire (kernel/locking/lockdep.c:5822) [ 138.672509][ T802] ? blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368) [ 138.672737][ T802] down_read (./arch/x86/include/asm/preempt.h:79 kernel/locking/rwsem.c:1246 kernel/locking/rwsem.c:1261 kernel/locking/rwsem.c:1526) [ 138.672875][ T802] ? blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368) [ 138.673106][ T802] ? __pfx_down_read (kernel/locking/rwsem.c:1522) [ 138.673296][ T802] ? __lock_release (kernel/locking/lockdep.c:5525) [ 138.673477][ T802] ? netconsole_netdev_event (drivers/net/netconsole.c:1082) [ 138.673661][ T802] ? __pfx___lock_release (kernel/locking/lockdep.c:5501) [ 138.673860][ T802] blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368) [ 138.674043][ T802] __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)) [ 138.674224][ T802] ? __pfx___netdev_upper_dev_unlink (net/core/dev.c:8151) [ 138.674448][ T802] ? __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) [ 138.674630][ T802] ? __pfx___mutex_unlock_slowpath (kernel/locking/mutex.c:890) [ 138.674855][ T802] ? rtnl_is_locked (net/core/rtnetlink.c:163) [ 138.675039][ T802] netdev_upper_dev_unlink (net/core/dev.c:8190) [ 138.675226][ T802] ? __pfx_netdev_upper_dev_unlink (net/core/dev.c:8190) [ 138.675451][ T802] ? netconsole_netdev_event (drivers/net/netconsole.c:1082) [ 138.675632][ T802] ? 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) [ 138.675813][ T802] ? rtnl_is_locked (net/core/rtnetlink.c:163) [ 138.675992][ T802] ? netdev_master_upper_dev_get (net/core/dev.c:7230) [ 138.676220][ T802] vrf_device_event (drivers/net/vrf.c:1110 drivers/net/vrf.c:1119 drivers/net/vrf.c:1804) vrf [ 138.676412][ T802] notifier_call_chain (kernel/notifier.c:85 (discriminator 2)) [ 138.676596][ T802] blocking_notifier_call_chain (kernel/notifier.c:381 kernel/notifier.c:368) [ 138.676777][ T802] unregister_netdevice_many_notify (net/core/dev.c:11575) [ 138.677001][ T802] ? 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) [ 138.677183][ T802] ? mark_lock (kernel/locking/lockdep.c:4727 (discriminator 3)) [ 138.677320][ T802] ? __pfx_unregister_netdevice_many_notify (net/core/dev.c:11516) [ 138.677545][ T802] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4347 kernel/locking/lockdep.c:4406) [ 138.677774][ T802] ? kfree (mm/slub.c:4613 mm/slub.c:4761) [ 138.677913][ T802] ? vlan_vid_del (net/8021q/vlan_core.c:368 net/8021q/vlan_core.c:387) [ 138.678097][ T802] ? vlan_vid_del (net/8021q/vlan_core.c:368 net/8021q/vlan_core.c:387) [ 138.678278][ T802] rtnl_dellink (net/core/rtnetlink.c:3487 net/core/rtnetlink.c:3527) [ 138.678461][ T802] ? __pfx_rtnl_dellink (net/core/rtnetlink.c:3493) [ 138.678657][ T802] ? find_held_lock (kernel/locking/lockdep.c:5339) [ 138.678840][ T802] ? __lock_release (kernel/locking/lockdep.c:5525) [ 138.679019][ T802] ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/core/rtnetlink.c:6909) [ 138.679204][ T802] ? __pfx___lock_release (kernel/locking/lockdep.c:5501) [ 138.679384][ T802] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814) [ 138.679568][ T802] ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/core/rtnetlink.c:6909) [ 138.679750][ T802] ? __pfx_rtnl_dellink (net/core/rtnetlink.c:3493) [ 138.679932][ T802] rtnetlink_rcv_msg (net/core/rtnetlink.c:6911) [ 138.680113][ T802] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6814) [ 138.680293][ T802] ? 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) [ 138.680478][ T802] ? mark_lock (kernel/locking/lockdep.c:4727 (discriminator 3)) [ 138.680618][ T802] ? __lock_acquire (kernel/locking/lockdep.c:5226) [ 138.680802][ T802] netlink_rcv_skb (net/netlink/af_netlink.c:2543) [ 138.680983][ T802] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6814) [ 138.681164][ T802] ? __pfx_netlink_rcv_skb (net/netlink/af_netlink.c:2520) [ 138.681351][ T802] ? netlink_deliver_tap (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/netlink/af_netlink.c:340) [ 138.681533][ T802] ? 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) [ 138.681717][ T802] netlink_unicast (net/netlink/af_netlink.c:1322 net/netlink/af_netlink.c:1348) [ 138.681898][ T802] ? __pfx_netlink_unicast (net/netlink/af_netlink.c:1333) [ 138.682086][ T802] ? find_held_lock (kernel/locking/lockdep.c:5339) [ 138.682274][ T802] netlink_sendmsg (net/netlink/af_netlink.c:1892) [ 138.682456][ T802] ? __pfx_netlink_sendmsg (net/netlink/af_netlink.c:1811) [ 138.682639][ T802] ____sys_sendmsg (net/socket.c:711 net/socket.c:726 net/socket.c:2594) [ 138.682821][ T802] ? __pfx_____sys_sendmsg (net/socket.c:2540) [ 138.683007][ T802] ? __pfx_copy_msghdr_from_user (net/socket.c:2520) [ 138.683236][ T802] ___sys_sendmsg (net/socket.c:2650) [ 138.683419][ T802] ? __pfx____sys_sendmsg (net/socket.c:2637) [ 138.683602][ T802] ? kasan_save_stack (mm/kasan/common.c:49) [ 138.683781][ T802] ? kasan_save_stack (mm/kasan/common.c:48) [ 138.683960][ T802] ? __kasan_record_aux_stack (mm/kasan/generic.c:544) [ 138.684140][ T802] ? __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) [ 138.684372][ T802] ? __x64_sys_close (fs/open.c:1557 fs/open.c:1539 fs/open.c:1539) [ 138.684553][ T802] ? do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) [ 138.684736][ T802] ? entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) [ 138.684970][ T802] ? __lock_acquire (kernel/locking/lockdep.c:5226) [ 138.685154][ T802] ? find_held_lock (kernel/locking/lockdep.c:5339) [ 138.685339][ T802] ? __lock_release (kernel/locking/lockdep.c:5525) [ 138.685520][ T802] ? __virt_addr_valid (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:962 ./include/linux/mmzone.h:2058 arch/x86/mm/physaddr.c:65) [ 138.685704][ T802] ? __pfx___lock_release (kernel/locking/lockdep.c:5501) [ 138.685890][ T802] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814) [ 138.686072][ T802] __sys_sendmsg (net/socket.c:2680) [ 138.686253][ T802] ? __pfx___sys_sendmsg (net/socket.c:2665) [ 138.686433][ T802] ? __pfx_slab_free_after_rcu_debug (mm/slub.c:4643) [ 138.686666][ T802] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) [ 138.686846][ T802] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) [ 138.687068][ T802] RIP: 0033:0x7f472e28f9a7 [ 138.687261][ T802] 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) [ 138.687895][ T802] RSP: 002b:00007fffa5f152f8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e [ 138.688169][ T802] RAX: ffffffffffffffda RBX: 00007fffa5f15a20 RCX: 00007f472e28f9a7 [ 138.688441][ T802] RDX: 0000000000000000 RSI: 00007fffa5f15360 RDI: 0000000000000005 [ 138.688714][ T802] RBP: 0000000000000002 R08: 0000000000000003 R09: 0000000000000078 [ 138.688984][ T802] R10: 00007f472e14def8 R11: 0000000000000246 R12: 0000000000000002 Finger prints: print_deadlock_bug:validate_chain:__lock_acquire:down_read:blocking_notifier_call_chain