====================================== | [ 59.940692][ T552] #0: ffffffffb3fe7a48 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_dellink (net/core/rtnetlink.c:3521) | [ 59.940957][ T552] #1: ffffffffb3fd6630 ((netdev_chain).rwsem){++++}-{4:4}, at: blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368) | [ 59.941250][ T552] | [ 59.941250][ T552] stack backtrace: [ 59.941670][ T552] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 59.941862][ T552] Call Trace: [ 59.941978][ T552] [ 59.942055][ T552] dump_stack_lvl (lib/dump_stack.c:123) [ 59.942206][ T552] print_deadlock_bug (kernel/locking/lockdep.c:3040) [ 59.942353][ T552] validate_chain (kernel/locking/lockdep.c:3894) [ 59.942505][ T552] ? __pfx_validate_chain (kernel/locking/lockdep.c:3860) [ 59.942655][ T552] ? 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) [ 59.942799][ T552] ? mark_lock (kernel/locking/lockdep.c:4727 (discriminator 3)) [ 59.942912][ T552] __lock_acquire (kernel/locking/lockdep.c:5226) [ 59.943062][ T552] lock_acquire.part.0 (kernel/locking/lockdep.c:467 kernel/locking/lockdep.c:5851) [ 59.943208][ T552] ? blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368) [ 59.943388][ T552] ? netconsole_process_cleanups_core (drivers/net/netconsole.c:242 (discriminator 11)) [ 59.943578][ T552] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814) [ 59.943724][ T552] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 37)) [ 59.943870][ T552] ? lock_acquire (kernel/locking/lockdep.c:5822) [ 59.944015][ T552] ? blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368) [ 59.944197][ T552] down_read (./arch/x86/include/asm/preempt.h:79 kernel/locking/rwsem.c:1246 kernel/locking/rwsem.c:1261 kernel/locking/rwsem.c:1526) [ 59.944308][ T552] ? blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368) [ 59.944490][ T552] ? __pfx_down_read (kernel/locking/rwsem.c:1522) [ 59.944644][ T552] ? __lock_release (kernel/locking/lockdep.c:5525) [ 59.944788][ T552] ? netconsole_netdev_event (drivers/net/netconsole.c:1082) [ 59.944935][ T552] ? __pfx___lock_release (kernel/locking/lockdep.c:5501) [ 59.945081][ T552] blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368) [ 59.945226][ T552] __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)) [ 59.945370][ T552] ? __pfx___netdev_upper_dev_unlink (net/core/dev.c:8151) [ 59.945553][ T552] ? __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) [ 59.945705][ T552] ? __pfx___mutex_unlock_slowpath (kernel/locking/mutex.c:890) [ 59.945887][ T552] ? rtnl_is_locked (net/core/rtnetlink.c:163) [ 59.946034][ T552] netdev_upper_dev_unlink (net/core/dev.c:8190) [ 59.946180][ T552] ? __pfx_netdev_upper_dev_unlink (net/core/dev.c:8190) [ 59.946360][ T552] ? netconsole_netdev_event (drivers/net/netconsole.c:1082) [ 59.946505][ T552] ? 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) [ 59.946662][ T552] ? rtnl_is_locked (net/core/rtnetlink.c:163) [ 59.946826][ T552] ? netdev_master_upper_dev_get (net/core/dev.c:7230) [ 59.947009][ T552] vrf_device_event (drivers/net/vrf.c:1110 drivers/net/vrf.c:1119 drivers/net/vrf.c:1804) vrf [ 59.947157][ T552] notifier_call_chain (kernel/notifier.c:85 (discriminator 2)) [ 59.947305][ T552] blocking_notifier_call_chain (kernel/notifier.c:381 kernel/notifier.c:368) [ 59.947449][ T552] unregister_netdevice_many_notify (net/core/dev.c:11575) [ 59.947632][ T552] ? __lock_release (kernel/locking/lockdep.c:5525) [ 59.947779][ T552] ? __pfx___lock_release (kernel/locking/lockdep.c:5501) [ 59.947932][ T552] ? __pfx_unregister_netdevice_many_notify (net/core/dev.c:11516) [ 59.948112][ T552] ? 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) [ 59.948261][ T552] ? mark_held_locks (kernel/locking/lockdep.c:4321) [ 59.948405][ T552] ? __pfx_vlan_info_rcu_free (net/8021q/vlan_core.c:145) [ 59.948558][ T552] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4347 kernel/locking/lockdep.c:4406) [ 59.948739][ T552] rtnl_dellink (net/core/rtnetlink.c:3487 net/core/rtnetlink.c:3527) [ 59.948888][ T552] ? __pfx_rtnl_dellink (net/core/rtnetlink.c:3493) [ 59.949047][ T552] ? find_held_lock (kernel/locking/lockdep.c:5339) [ 59.949195][ T552] ? __lock_release (kernel/locking/lockdep.c:5525) [ 59.949345][ T552] ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/core/rtnetlink.c:6909) [ 59.949492][ T552] ? __pfx___lock_release (kernel/locking/lockdep.c:5501) [ 59.949642][ T552] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814) [ 59.949793][ T552] ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/core/rtnetlink.c:6909) [ 59.949956][ T552] ? __pfx_rtnl_dellink (net/core/rtnetlink.c:3493) [ 59.950115][ T552] rtnetlink_rcv_msg (net/core/rtnetlink.c:6911) [ 59.950276][ T552] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6814) [ 59.950437][ T552] ? 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) [ 59.950598][ T552] ? mark_lock (kernel/locking/lockdep.c:4727 (discriminator 3)) [ 59.950726][ T552] ? __lock_acquire (kernel/locking/lockdep.c:5226) [ 59.950888][ T552] netlink_rcv_skb (net/netlink/af_netlink.c:2543) [ 59.951050][ T552] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6814) [ 59.951226][ T552] ? __pfx_netlink_rcv_skb (net/netlink/af_netlink.c:2520) [ 59.951391][ T552] ? netlink_deliver_tap (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/netlink/af_netlink.c:340) [ 59.951556][ T552] ? 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) [ 59.951718][ T552] netlink_unicast (net/netlink/af_netlink.c:1322 net/netlink/af_netlink.c:1348) [ 59.951882][ T552] ? __pfx_netlink_unicast (net/netlink/af_netlink.c:1333) [ 59.952041][ T552] ? find_held_lock (kernel/locking/lockdep.c:5339) [ 59.952203][ T552] netlink_sendmsg (net/netlink/af_netlink.c:1892) [ 59.952369][ T552] ? __pfx_netlink_sendmsg (net/netlink/af_netlink.c:1811) [ 59.952525][ T552] ____sys_sendmsg (net/socket.c:711 net/socket.c:726 net/socket.c:2594) [ 59.952686][ T552] ? __pfx_____sys_sendmsg (net/socket.c:2540) [ 59.952837][ T552] ? __pfx_copy_msghdr_from_user (net/socket.c:2520) [ 59.953021][ T552] ___sys_sendmsg (net/socket.c:2650) [ 59.953167][ T552] ? __pfx____sys_sendmsg (net/socket.c:2637) [ 59.953312][ T552] ? kasan_save_stack (mm/kasan/common.c:49) [ 59.953466][ T552] ? kasan_save_stack (mm/kasan/common.c:48) [ 59.953621][ T552] ? __kasan_record_aux_stack (mm/kasan/generic.c:544) [ 59.953766][ T552] ? __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) [ 59.953945][ T552] ? __x64_sys_close (fs/open.c:1557 fs/open.c:1539 fs/open.c:1539) [ 59.954091][ T552] ? do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) [ 59.954235][ T552] ? entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) [ 59.954417][ T552] ? __lock_acquire (kernel/locking/lockdep.c:5226) [ 59.954573][ T552] ? find_held_lock (kernel/locking/lockdep.c:5339) [ 59.954721][ T552] ? __lock_release (kernel/locking/lockdep.c:5525) [ 59.954865][ T552] ? __virt_addr_valid (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:962 ./include/linux/mmzone.h:2058 arch/x86/mm/physaddr.c:65) [ 59.955010][ T552] ? __pfx___lock_release (kernel/locking/lockdep.c:5501) [ 59.955153][ T552] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814) [ 59.955300][ T552] __sys_sendmsg (net/socket.c:2680) [ 59.955445][ T552] ? __pfx___sys_sendmsg (net/socket.c:2665) [ 59.955601][ T552] ? __pfx_slab_free_after_rcu_debug (mm/slub.c:4643) [ 59.955801][ T552] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) [ 59.955945][ T552] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) [ 59.956122][ T552] RIP: 0033:0x7fae5615a9a7 [ 59.956275][ T552] 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) [ 59.956795][ T552] RSP: 002b:00007ffcc0970ee8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e [ 59.957029][ T552] RAX: ffffffffffffffda RBX: 00007ffcc0971610 RCX: 00007fae5615a9a7 [ 59.957255][ T552] RDX: 0000000000000000 RSI: 00007ffcc0970f50 RDI: 0000000000000005 [ 59.957475][ T552] RBP: 0000000000000002 R08: 0000000000000003 R09: 0000000000000078 [ 59.957707][ T552] R10: 00007fae56018ef8 R11: 0000000000000246 R12: 0000000000000002 Finger prints: print_deadlock_bug:validate_chain:__lock_acquire:down_read:blocking_notifier_call_chain