====================================== | [ 48.526800][ T638] #0: ffffffffb43e7a48 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_dellink (net/core/rtnetlink.c:3521) | [ 48.527090][ T638] #1: ffffffffb43d6630 ((netdev_chain).rwsem){++++}-{4:4}, at: blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368) | [ 48.527419][ T638] | [ 48.527419][ T638] stack backtrace: [ 48.527866][ T638] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 48.528075][ T638] Call Trace: [ 48.528201][ T638] [ 48.528285][ T638] dump_stack_lvl (lib/dump_stack.c:123) [ 48.528454][ T638] print_deadlock_bug (kernel/locking/lockdep.c:3040) [ 48.528623][ T638] validate_chain (kernel/locking/lockdep.c:3894) [ 48.528791][ T638] ? __pfx_validate_chain (kernel/locking/lockdep.c:3860) [ 48.528959][ T638] ? 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) [ 48.529118][ T638] ? mark_lock (kernel/locking/lockdep.c:4727 (discriminator 3)) [ 48.529241][ T638] __lock_acquire (kernel/locking/lockdep.c:5226) [ 48.529406][ T638] lock_acquire.part.0 (kernel/locking/lockdep.c:467 kernel/locking/lockdep.c:5851) [ 48.529570][ T638] ? blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368) [ 48.529778][ T638] ? netconsole_process_cleanups_core (drivers/net/netconsole.c:242 (discriminator 11)) [ 48.529986][ T638] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814) [ 48.530150][ T638] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 37)) [ 48.530312][ T638] ? lock_acquire (kernel/locking/lockdep.c:5822) [ 48.530482][ T638] ? blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368) [ 48.530685][ T638] down_read (./arch/x86/include/asm/preempt.h:79 kernel/locking/rwsem.c:1246 kernel/locking/rwsem.c:1261 kernel/locking/rwsem.c:1526) [ 48.530808][ T638] ? blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368) [ 48.531029][ T638] ? __pfx_down_read (kernel/locking/rwsem.c:1522) [ 48.531185][ T638] ? __lock_release (kernel/locking/lockdep.c:5525) [ 48.531340][ T638] ? netconsole_netdev_event (drivers/net/netconsole.c:1082) [ 48.531501][ T638] ? __pfx___lock_release (kernel/locking/lockdep.c:5501) [ 48.531670][ T638] blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368) [ 48.531837][ T638] __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)) [ 48.532002][ T638] ? __pfx___netdev_upper_dev_unlink (net/core/dev.c:8151) [ 48.532203][ T638] ? __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) [ 48.532363][ T638] ? __pfx___mutex_unlock_slowpath (kernel/locking/mutex.c:890) [ 48.532566][ T638] ? rtnl_is_locked (net/core/rtnetlink.c:163) [ 48.532730][ T638] netdev_upper_dev_unlink (net/core/dev.c:8190) [ 48.532898][ T638] ? __pfx_netdev_upper_dev_unlink (net/core/dev.c:8190) [ 48.533098][ T638] ? netconsole_netdev_event (drivers/net/netconsole.c:1082) [ 48.533261][ T638] ? 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) [ 48.533423][ T638] ? rtnl_is_locked (net/core/rtnetlink.c:163) [ 48.533588][ T638] ? netdev_master_upper_dev_get (net/core/dev.c:7230) [ 48.533790][ T638] vrf_device_event (drivers/net/vrf.c:1110 drivers/net/vrf.c:1119 drivers/net/vrf.c:1804) vrf [ 48.533955][ T638] notifier_call_chain (kernel/notifier.c:85 (discriminator 2)) [ 48.534125][ T638] blocking_notifier_call_chain (kernel/notifier.c:381 kernel/notifier.c:368) [ 48.534286][ T638] unregister_netdevice_many_notify (net/core/dev.c:11575) [ 48.534488][ T638] ? 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) [ 48.534649][ T638] ? mark_lock (kernel/locking/lockdep.c:4727 (discriminator 3)) [ 48.534773][ T638] ? __pfx_unregister_netdevice_many_notify (net/core/dev.c:11516) [ 48.534975][ T638] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4347 kernel/locking/lockdep.c:4406) [ 48.535186][ T638] ? kfree (mm/slub.c:4613 mm/slub.c:4761) [ 48.535310][ T638] ? vlan_vid_del (net/8021q/vlan_core.c:368 net/8021q/vlan_core.c:387) [ 48.535477][ T638] ? vlan_vid_del (net/8021q/vlan_core.c:368 net/8021q/vlan_core.c:387) [ 48.535637][ T638] rtnl_dellink (net/core/rtnetlink.c:3487 net/core/rtnetlink.c:3527) [ 48.535802][ T638] ? __pfx_rtnl_dellink (net/core/rtnetlink.c:3493) [ 48.535980][ T638] ? find_held_lock (kernel/locking/lockdep.c:5339) [ 48.536145][ T638] ? __lock_release (kernel/locking/lockdep.c:5525) [ 48.536306][ T638] ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/core/rtnetlink.c:6909) [ 48.536473][ T638] ? __pfx___lock_release (kernel/locking/lockdep.c:5501) [ 48.536638][ T638] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814) [ 48.536800][ T638] ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/core/rtnetlink.c:6909) [ 48.536961][ T638] ? __pfx_rtnl_dellink (net/core/rtnetlink.c:3493) [ 48.537125][ T638] rtnetlink_rcv_msg (net/core/rtnetlink.c:6911) [ 48.537285][ T638] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6814) [ 48.537447][ T638] ? 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) [ 48.537612][ T638] ? mark_lock (kernel/locking/lockdep.c:4727 (discriminator 3)) [ 48.537737][ T638] ? __lock_acquire (kernel/locking/lockdep.c:5226) [ 48.537901][ T638] netlink_rcv_skb (net/netlink/af_netlink.c:2543) [ 48.538064][ T638] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6814) [ 48.538225][ T638] ? __pfx_netlink_rcv_skb (net/netlink/af_netlink.c:2520) [ 48.538391][ T638] ? netlink_deliver_tap (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/netlink/af_netlink.c:340) [ 48.538554][ T638] ? 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) [ 48.538721][ T638] netlink_unicast (net/netlink/af_netlink.c:1322 net/netlink/af_netlink.c:1348) [ 48.538884][ T638] ? __pfx_netlink_unicast (net/netlink/af_netlink.c:1333) [ 48.539047][ T638] ? find_held_lock (kernel/locking/lockdep.c:5339) [ 48.539213][ T638] netlink_sendmsg (net/netlink/af_netlink.c:1892) [ 48.539374][ T638] ? __pfx_netlink_sendmsg (net/netlink/af_netlink.c:1811) [ 48.539538][ T638] ____sys_sendmsg (net/socket.c:711 net/socket.c:726 net/socket.c:2594) [ 48.539704][ T638] ? __pfx_____sys_sendmsg (net/socket.c:2540) [ 48.539868][ T638] ? __pfx_copy_msghdr_from_user (net/socket.c:2520) [ 48.540085][ T638] ___sys_sendmsg (net/socket.c:2650) [ 48.540248][ T638] ? __pfx____sys_sendmsg (net/socket.c:2637) [ 48.540413][ T638] ? kasan_save_stack (mm/kasan/common.c:49) [ 48.540576][ T638] ? kasan_save_stack (mm/kasan/common.c:48) [ 48.540738][ T638] ? __kasan_record_aux_stack (mm/kasan/generic.c:544) [ 48.540902][ T638] ? __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) [ 48.541126][ T638] ? __x64_sys_close (fs/open.c:1557 fs/open.c:1539 fs/open.c:1539) [ 48.541299][ T638] ? do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) [ 48.541462][ T638] ? entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) [ 48.541665][ T638] ? __lock_acquire (kernel/locking/lockdep.c:5226) [ 48.541831][ T638] ? find_held_lock (kernel/locking/lockdep.c:5339) [ 48.541996][ T638] ? __lock_release (kernel/locking/lockdep.c:5525) [ 48.542158][ T638] ? __virt_addr_valid (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:962 ./include/linux/mmzone.h:2058 arch/x86/mm/physaddr.c:65) [ 48.542324][ T638] ? __pfx___lock_release (kernel/locking/lockdep.c:5501) [ 48.542488][ T638] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814) [ 48.542654][ T638] __sys_sendmsg (net/socket.c:2680) [ 48.542817][ T638] ? __pfx___sys_sendmsg (net/socket.c:2665) [ 48.542980][ T638] ? __pfx_slab_free_after_rcu_debug (mm/slub.c:4643) [ 48.543184][ T638] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) [ 48.543346][ T638] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) [ 48.543545][ T638] RIP: 0033:0x7f79913659a7 [ 48.543726][ T638] 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) [ 48.544290][ T638] RSP: 002b:00007ffeb1e55118 EFLAGS: 00000246 ORIG_RAX: 000000000000002e [ 48.544533][ T638] RAX: ffffffffffffffda RBX: 00007ffeb1e55840 RCX: 00007f79913659a7 [ 48.544779][ T638] RDX: 0000000000000000 RSI: 00007ffeb1e55180 RDI: 0000000000000005 [ 48.545025][ T638] RBP: 0000000000000002 R08: 0000000000000003 R09: 0000000000000078 [ 48.545262][ T638] R10: 00007f7991223ef8 R11: 0000000000000246 R12: 0000000000000002 Finger prints: print_deadlock_bug:validate_chain:__lock_acquire:down_read:blocking_notifier_call_chain