====================================== | [ 101.116290][ T786] #0: ffffffff8b7e7a48 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_dellink (net/core/rtnetlink.c:3521) | [ 101.116567][ T786] #1: ffffffff8b7d6630 ((netdev_chain).rwsem){++++}-{4:4}, at: blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368) | [ 101.116870][ T786] | [ 101.116870][ T786] stack backtrace: [ 101.117287][ T786] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 101.117491][ T786] Call Trace: [ 101.117613][ T786] [ 101.117699][ T786] dump_stack_lvl (lib/dump_stack.c:123) [ 101.117853][ T786] print_deadlock_bug (kernel/locking/lockdep.c:3040) [ 101.118012][ T786] validate_chain (kernel/locking/lockdep.c:3894) [ 101.118175][ T786] ? __pfx_validate_chain (kernel/locking/lockdep.c:3860) [ 101.118332][ T786] ? 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) [ 101.118479][ T786] ? mark_lock (kernel/locking/lockdep.c:4727 (discriminator 3)) [ 101.118594][ T786] __lock_acquire (kernel/locking/lockdep.c:5226) [ 101.118758][ T786] lock_acquire.part.0 (kernel/locking/lockdep.c:467 kernel/locking/lockdep.c:5851) [ 101.118914][ T786] ? blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368) [ 101.119112][ T786] ? netconsole_process_cleanups_core (drivers/net/netconsole.c:242 (discriminator 11)) [ 101.119318][ T786] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814) [ 101.119485][ T786] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 37)) [ 101.119634][ T786] ? lock_acquire (kernel/locking/lockdep.c:5822) [ 101.119779][ T786] ? blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368) [ 101.119962][ T786] down_read (./arch/x86/include/asm/preempt.h:79 kernel/locking/rwsem.c:1246 kernel/locking/rwsem.c:1261 kernel/locking/rwsem.c:1526) [ 101.120075][ T786] ? blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368) [ 101.120264][ T786] ? __pfx_down_read (kernel/locking/rwsem.c:1522) [ 101.120419][ T786] ? __lock_release (kernel/locking/lockdep.c:5525) [ 101.120567][ T786] ? netconsole_netdev_event (drivers/net/netconsole.c:1082) [ 101.120715][ T786] ? __pfx___lock_release (kernel/locking/lockdep.c:5501) [ 101.120862][ T786] blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368) [ 101.121010][ T786] __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)) [ 101.121159][ T786] ? __pfx___netdev_upper_dev_unlink (net/core/dev.c:8151) [ 101.121355][ T786] ? __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) [ 101.121511][ T786] ? __pfx___mutex_unlock_slowpath (kernel/locking/mutex.c:890) [ 101.121701][ T786] ? rtnl_is_locked (net/core/rtnetlink.c:163) [ 101.121851][ T786] netdev_upper_dev_unlink (net/core/dev.c:8190) [ 101.121999][ T786] ? __pfx_netdev_upper_dev_unlink (net/core/dev.c:8190) [ 101.122182][ T786] ? netconsole_netdev_event (drivers/net/netconsole.c:1082) [ 101.122336][ T786] ? 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) [ 101.122495][ T786] ? rtnl_is_locked (net/core/rtnetlink.c:163) [ 101.122641][ T786] ? netdev_master_upper_dev_get (net/core/dev.c:7230) [ 101.122841][ T786] vrf_device_event (drivers/net/vrf.c:1110 drivers/net/vrf.c:1119 drivers/net/vrf.c:1804) vrf [ 101.122994][ T786] notifier_call_chain (kernel/notifier.c:85 (discriminator 2)) [ 101.123143][ T786] blocking_notifier_call_chain (kernel/notifier.c:381 kernel/notifier.c:368) [ 101.123294][ T786] unregister_netdevice_many_notify (net/core/dev.c:11575) [ 101.123480][ T786] ? __lock_release (kernel/locking/lockdep.c:5525) [ 101.123634][ T786] ? __pfx___lock_release (kernel/locking/lockdep.c:5501) [ 101.123789][ T786] ? __pfx_unregister_netdevice_many_notify (net/core/dev.c:11516) [ 101.123981][ T786] ? 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) [ 101.124137][ T786] ? mark_held_locks (kernel/locking/lockdep.c:4321) [ 101.124300][ T786] ? __pfx_vlan_info_rcu_free (net/8021q/vlan_core.c:145) [ 101.124454][ T786] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4347 kernel/locking/lockdep.c:4406) [ 101.124647][ T786] rtnl_dellink (net/core/rtnetlink.c:3487 net/core/rtnetlink.c:3527) [ 101.124799][ T786] ? __pfx_rtnl_dellink (net/core/rtnetlink.c:3493) [ 101.124961][ T786] ? find_held_lock (kernel/locking/lockdep.c:5339) [ 101.125124][ T786] ? __lock_release (kernel/locking/lockdep.c:5525) [ 101.125275][ T786] ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/core/rtnetlink.c:6909) [ 101.125440][ T786] ? __pfx___lock_release (kernel/locking/lockdep.c:5501) [ 101.125586][ T786] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814) [ 101.125736][ T786] ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/core/rtnetlink.c:6909) [ 101.125889][ T786] ? __pfx_rtnl_dellink (net/core/rtnetlink.c:3493) [ 101.126039][ T786] rtnetlink_rcv_msg (net/core/rtnetlink.c:6911) [ 101.126186][ T786] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6814) [ 101.126334][ T786] ? 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) [ 101.126479][ T786] ? mark_lock (kernel/locking/lockdep.c:4727 (discriminator 3)) [ 101.126593][ T786] ? __lock_acquire (kernel/locking/lockdep.c:5226) [ 101.126741][ T786] netlink_rcv_skb (net/netlink/af_netlink.c:2543) [ 101.126893][ T786] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6814) [ 101.127040][ T786] ? __pfx_netlink_rcv_skb (net/netlink/af_netlink.c:2520) [ 101.127193][ T786] ? netlink_deliver_tap (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/netlink/af_netlink.c:340) [ 101.127348][ T786] ? 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) [ 101.127498][ T786] netlink_unicast (net/netlink/af_netlink.c:1322 net/netlink/af_netlink.c:1348) [ 101.127645][ T786] ? __pfx_netlink_unicast (net/netlink/af_netlink.c:1333) [ 101.127793][ T786] ? find_held_lock (kernel/locking/lockdep.c:5339) [ 101.127945][ T786] netlink_sendmsg (net/netlink/af_netlink.c:1892) [ 101.128092][ T786] ? __pfx_netlink_sendmsg (net/netlink/af_netlink.c:1811) [ 101.128243][ T786] ____sys_sendmsg (net/socket.c:711 net/socket.c:726 net/socket.c:2594) [ 101.128401][ T786] ? __pfx_____sys_sendmsg (net/socket.c:2540) [ 101.128548][ T786] ? __pfx_copy_msghdr_from_user (net/socket.c:2520) [ 101.128735][ T786] ___sys_sendmsg (net/socket.c:2650) [ 101.128884][ T786] ? __pfx____sys_sendmsg (net/socket.c:2637) [ 101.129040][ T786] ? kasan_save_stack (mm/kasan/common.c:49) [ 101.129198][ T786] ? kasan_save_stack (mm/kasan/common.c:48) [ 101.129360][ T786] ? __kasan_record_aux_stack (mm/kasan/generic.c:544) [ 101.129522][ T786] ? __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) [ 101.129709][ T786] ? __x64_sys_close (fs/open.c:1557 fs/open.c:1539 fs/open.c:1539) [ 101.129857][ T786] ? do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) [ 101.130006][ T786] ? entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) [ 101.130198][ T786] ? __lock_acquire (kernel/locking/lockdep.c:5226) [ 101.130354][ T786] ? find_held_lock (kernel/locking/lockdep.c:5339) [ 101.130503][ T786] ? __lock_release (kernel/locking/lockdep.c:5525) [ 101.130659][ T786] ? __virt_addr_valid (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:962 ./include/linux/mmzone.h:2058 arch/x86/mm/physaddr.c:65) [ 101.130826][ T786] ? __pfx___lock_release (kernel/locking/lockdep.c:5501) [ 101.130974][ T786] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814) [ 101.131124][ T786] __sys_sendmsg (net/socket.c:2680) [ 101.131278][ T786] ? __pfx___sys_sendmsg (net/socket.c:2665) [ 101.131432][ T786] ? __pfx_slab_free_after_rcu_debug (mm/slub.c:4643) [ 101.131631][ T786] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) [ 101.131796][ T786] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) [ 101.131997][ T786] RIP: 0033:0x7f7489efc9a7 [ 101.132167][ T786] 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) [ 101.132750][ T786] RSP: 002b:00007ffeb4046448 EFLAGS: 00000246 ORIG_RAX: 000000000000002e [ 101.133005][ T786] RAX: ffffffffffffffda RBX: 00007ffeb4046b70 RCX: 00007f7489efc9a7 [ 101.133254][ T786] RDX: 0000000000000000 RSI: 00007ffeb40464b0 RDI: 0000000000000005 [ 101.133505][ T786] RBP: 0000000000000002 R08: 0000000000000003 R09: 0000000000000078 [ 101.133733][ T786] R10: 00007f7489dbaef8 R11: 0000000000000246 R12: 0000000000000002 Finger prints: print_deadlock_bug:validate_chain:__lock_acquire:down_read:blocking_notifier_call_chain