====================================== | [ 34.026893][ T467] #0: ffffffff91de7a48 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_dellink (net/core/rtnetlink.c:3521) | [ 34.027206][ T467] #1: ffffffff91dd6630 ((netdev_chain).rwsem){++++}-{4:4}, at: blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368) | [ 34.027561][ T467] | [ 34.027561][ T467] stack backtrace: [ 34.028037][ T467] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 34.028254][ T467] Call Trace: [ 34.028402][ T467] [ 34.028493][ T467] dump_stack_lvl (lib/dump_stack.c:123) [ 34.028676][ T467] print_deadlock_bug (kernel/locking/lockdep.c:3040) [ 34.028858][ T467] validate_chain (kernel/locking/lockdep.c:3894) [ 34.029035][ T467] ? __pfx_validate_chain (kernel/locking/lockdep.c:3860) [ 34.029208][ T467] ? 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) [ 34.029378][ T467] ? mark_lock (kernel/locking/lockdep.c:4727 (discriminator 3)) [ 34.029512][ T467] __lock_acquire (kernel/locking/lockdep.c:5226) [ 34.029684][ T467] lock_acquire.part.0 (kernel/locking/lockdep.c:467 kernel/locking/lockdep.c:5851) [ 34.029856][ T467] ? blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368) [ 34.030070][ T467] ? netconsole_process_cleanups_core (drivers/net/netconsole.c:242 (discriminator 11)) [ 34.030294][ T467] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814) [ 34.030469][ T467] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 37)) [ 34.030642][ T467] ? lock_acquire (kernel/locking/lockdep.c:5822) [ 34.030817][ T467] ? blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368) [ 34.031032][ T467] down_read (./arch/x86/include/asm/preempt.h:79 kernel/locking/rwsem.c:1246 kernel/locking/rwsem.c:1261 kernel/locking/rwsem.c:1526) [ 34.031166][ T467] ? blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368) [ 34.031381][ T467] ? __pfx_down_read (kernel/locking/rwsem.c:1522) [ 34.031556][ T467] ? __lock_release (kernel/locking/lockdep.c:5525) [ 34.031726][ T467] ? netconsole_netdev_event (drivers/net/netconsole.c:1082) [ 34.031900][ T467] ? __pfx___lock_release (kernel/locking/lockdep.c:5501) [ 34.032075][ T467] blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368) [ 34.032248][ T467] __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)) [ 34.032424][ T467] ? __pfx___netdev_upper_dev_unlink (net/core/dev.c:8151) [ 34.032650][ T467] ? __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) [ 34.032822][ T467] ? __pfx___mutex_unlock_slowpath (kernel/locking/mutex.c:890) [ 34.033037][ T467] ? rtnl_is_locked (net/core/rtnetlink.c:163) [ 34.033213][ T467] netdev_upper_dev_unlink (net/core/dev.c:8190) [ 34.033383][ T467] ? __pfx_netdev_upper_dev_unlink (net/core/dev.c:8190) [ 34.033596][ T467] ? netconsole_netdev_event (drivers/net/netconsole.c:1082) [ 34.033767][ T467] ? 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) [ 34.033945][ T467] ? rtnl_is_locked (net/core/rtnetlink.c:163) [ 34.034118][ T467] ? netdev_master_upper_dev_get (net/core/dev.c:7230) [ 34.034327][ T467] vrf_device_event (drivers/net/vrf.c:1110 drivers/net/vrf.c:1119 drivers/net/vrf.c:1804) vrf [ 34.034499][ T467] notifier_call_chain (kernel/notifier.c:85 (discriminator 2)) [ 34.034679][ T467] blocking_notifier_call_chain (kernel/notifier.c:381 kernel/notifier.c:368) [ 34.034849][ T467] unregister_netdevice_many_notify (net/core/dev.c:11575) [ 34.035062][ T467] ? __lock_release (kernel/locking/lockdep.c:5525) [ 34.035237][ T467] ? __pfx___lock_release (kernel/locking/lockdep.c:5501) [ 34.035411][ T467] ? __pfx_unregister_netdevice_many_notify (net/core/dev.c:11516) [ 34.035622][ T467] ? 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) [ 34.035794][ T467] ? mark_held_locks (kernel/locking/lockdep.c:4321) [ 34.035967][ T467] ? __pfx_vlan_info_rcu_free (net/8021q/vlan_core.c:145) [ 34.036143][ T467] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4347 kernel/locking/lockdep.c:4406) [ 34.036357][ T467] rtnl_dellink (net/core/rtnetlink.c:3487 net/core/rtnetlink.c:3527) [ 34.036532][ T467] ? __pfx_rtnl_dellink (net/core/rtnetlink.c:3493) [ 34.036717][ T467] ? find_held_lock (kernel/locking/lockdep.c:5339) [ 34.036891][ T467] ? __lock_release (kernel/locking/lockdep.c:5525) [ 34.037061][ T467] ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/core/rtnetlink.c:6909) [ 34.037231][ T467] ? __pfx___lock_release (kernel/locking/lockdep.c:5501) [ 34.037402][ T467] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814) [ 34.037574][ T467] ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/core/rtnetlink.c:6909) [ 34.037752][ T467] ? __pfx_rtnl_dellink (net/core/rtnetlink.c:3493) [ 34.037921][ T467] rtnetlink_rcv_msg (net/core/rtnetlink.c:6911) [ 34.038096][ T467] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6814) [ 34.038267][ T467] ? 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) [ 34.038448][ T467] ? mark_lock (kernel/locking/lockdep.c:4727 (discriminator 3)) [ 34.038580][ T467] ? __lock_acquire (kernel/locking/lockdep.c:5226) [ 34.038753][ T467] netlink_rcv_skb (net/netlink/af_netlink.c:2543) [ 34.038931][ T467] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6814) [ 34.039110][ T467] ? __pfx_netlink_rcv_skb (net/netlink/af_netlink.c:2520) [ 34.039284][ T467] ? netlink_deliver_tap (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/netlink/af_netlink.c:340) [ 34.039464][ T467] ? 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) [ 34.039637][ T467] netlink_unicast (net/netlink/af_netlink.c:1322 net/netlink/af_netlink.c:1348) [ 34.039806][ T467] ? __pfx_netlink_unicast (net/netlink/af_netlink.c:1333) [ 34.039978][ T467] ? find_held_lock (kernel/locking/lockdep.c:5339) [ 34.040157][ T467] netlink_sendmsg (net/netlink/af_netlink.c:1892) [ 34.040333][ T467] ? __pfx_netlink_sendmsg (net/netlink/af_netlink.c:1811) [ 34.040511][ T467] ____sys_sendmsg (net/socket.c:711 net/socket.c:726 net/socket.c:2594) [ 34.040686][ T467] ? __pfx_____sys_sendmsg (net/socket.c:2540) [ 34.040863][ T467] ? __pfx_copy_msghdr_from_user (net/socket.c:2520) [ 34.041083][ T467] ___sys_sendmsg (net/socket.c:2650) [ 34.041256][ T467] ? __pfx____sys_sendmsg (net/socket.c:2637) [ 34.041437][ T467] ? kasan_save_stack (mm/kasan/common.c:49) [ 34.041616][ T467] ? kasan_save_stack (mm/kasan/common.c:48) [ 34.041789][ T467] ? __kasan_record_aux_stack (mm/kasan/generic.c:544) [ 34.041965][ T467] ? __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) [ 34.042183][ T467] ? __x64_sys_close (fs/open.c:1557 fs/open.c:1539 fs/open.c:1539) [ 34.042363][ T467] ? do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) [ 34.042538][ T467] ? entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) [ 34.042757][ T467] ? __lock_acquire (kernel/locking/lockdep.c:5226) [ 34.042937][ T467] ? find_held_lock (kernel/locking/lockdep.c:5339) [ 34.043114][ T467] ? __lock_release (kernel/locking/lockdep.c:5525) [ 34.043286][ T467] ? __virt_addr_valid (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:962 ./include/linux/mmzone.h:2058 arch/x86/mm/physaddr.c:65) [ 34.043466][ T467] ? __pfx___lock_release (kernel/locking/lockdep.c:5501) [ 34.043642][ T467] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814) [ 34.043822][ T467] __sys_sendmsg (net/socket.c:2680) [ 34.043997][ T467] ? __pfx___sys_sendmsg (net/socket.c:2665) [ 34.044176][ T467] ? __pfx_slab_free_after_rcu_debug (mm/slub.c:4643) [ 34.044402][ T467] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) [ 34.044575][ T467] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) [ 34.044795][ T467] RIP: 0033:0x7f30307009a7 [ 34.044978][ T467] 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) [ 34.045592][ T467] RSP: 002b:00007ffc200cc838 EFLAGS: 00000246 ORIG_RAX: 000000000000002e [ 34.045856][ T467] RAX: ffffffffffffffda RBX: 00007ffc200ccf60 RCX: 00007f30307009a7 [ 34.046117][ T467] RDX: 0000000000000000 RSI: 00007ffc200cc8a0 RDI: 0000000000000005 [ 34.046378][ T467] RBP: 0000000000000002 R08: 0000000000000003 R09: 0000000000000078 [ 34.046644][ T467] R10: 00007f30305beef8 R11: 0000000000000246 R12: 0000000000000002 Finger prints: print_deadlock_bug:validate_chain:__lock_acquire:down_read:blocking_notifier_call_chain