====================================== | [ 32.342253][ T419] #0: ffffffff99be7a48 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_dellink (net/core/rtnetlink.c:3521) | [ 32.342592][ T419] #1: ffffffff99bd6630 ((netdev_chain).rwsem){++++}-{4:4}, at: blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368) | [ 32.342958][ T419] | [ 32.342958][ T419] stack backtrace: [ 32.343484][ T419] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 32.343782][ T419] Call Trace: [ 32.344004][ T419] [ 32.344122][ T419] dump_stack_lvl (lib/dump_stack.c:123) [ 32.344356][ T419] print_deadlock_bug (kernel/locking/lockdep.c:3040) [ 32.344591][ T419] validate_chain (kernel/locking/lockdep.c:3894) [ 32.344765][ T419] ? __pfx_validate_chain (kernel/locking/lockdep.c:3860) [ 32.344942][ T419] ? 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) [ 32.345101][ T419] ? mark_lock (kernel/locking/lockdep.c:4727 (discriminator 3)) [ 32.345213][ T419] __lock_acquire (kernel/locking/lockdep.c:5226) [ 32.345441][ T419] lock_acquire.part.0 (kernel/locking/lockdep.c:467 kernel/locking/lockdep.c:5851) [ 32.345655][ T419] ? blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368) [ 32.345888][ T419] ? netconsole_process_cleanups_core (drivers/net/netconsole.c:242 (discriminator 11)) [ 32.346189][ T419] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814) [ 32.346390][ T419] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 37)) [ 32.346591][ T419] ? lock_acquire (kernel/locking/lockdep.c:5822) [ 32.346803][ T419] ? blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368) [ 32.347035][ T419] down_read (./arch/x86/include/asm/preempt.h:79 kernel/locking/rwsem.c:1246 kernel/locking/rwsem.c:1261 kernel/locking/rwsem.c:1526) [ 32.347164][ T419] ? blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368) [ 32.347365][ T419] ? __pfx_down_read (kernel/locking/rwsem.c:1522) [ 32.347538][ T419] ? __lock_release (kernel/locking/lockdep.c:5525) [ 32.347755][ T419] ? netconsole_netdev_event (drivers/net/netconsole.c:1082) [ 32.347968][ T419] ? __pfx___lock_release (kernel/locking/lockdep.c:5501) [ 32.348177][ T419] blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368) [ 32.348394][ T419] __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)) [ 32.348616][ T419] ? __pfx___netdev_upper_dev_unlink (net/core/dev.c:8151) [ 32.348818][ T419] ? __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) [ 32.348981][ T419] ? __pfx___mutex_unlock_slowpath (kernel/locking/mutex.c:890) [ 32.349185][ T419] ? rtnl_is_locked (net/core/rtnetlink.c:163) [ 32.349352][ T419] netdev_upper_dev_unlink (net/core/dev.c:8190) [ 32.349573][ T419] ? __pfx_netdev_upper_dev_unlink (net/core/dev.c:8190) [ 32.349759][ T419] ? netconsole_netdev_event (drivers/net/netconsole.c:1082) [ 32.349913][ T419] ? 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) [ 32.350061][ T419] ? rtnl_is_locked (net/core/rtnetlink.c:163) [ 32.350214][ T419] ? netdev_master_upper_dev_get (net/core/dev.c:7230) [ 32.350400][ T419] vrf_device_event (drivers/net/vrf.c:1110 drivers/net/vrf.c:1119 drivers/net/vrf.c:1804) vrf [ 32.350562][ T419] notifier_call_chain (kernel/notifier.c:85 (discriminator 2)) [ 32.350718][ T419] blocking_notifier_call_chain (kernel/notifier.c:381 kernel/notifier.c:368) [ 32.350881][ T419] unregister_netdevice_many_notify (net/core/dev.c:11575) [ 32.351129][ T419] ? __lock_release (kernel/locking/lockdep.c:5525) [ 32.351287][ T419] ? __pfx___lock_release (kernel/locking/lockdep.c:5501) [ 32.351458][ T419] ? __pfx_unregister_netdevice_many_notify (net/core/dev.c:11516) [ 32.351657][ T419] ? 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) [ 32.351823][ T419] ? mark_held_locks (kernel/locking/lockdep.c:4321) [ 32.351996][ T419] ? __pfx_vlan_info_rcu_free (net/8021q/vlan_core.c:145) [ 32.352211][ T419] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4347 kernel/locking/lockdep.c:4406) [ 32.352478][ T419] rtnl_dellink (net/core/rtnetlink.c:3487 net/core/rtnetlink.c:3527) [ 32.352648][ T419] ? __pfx_rtnl_dellink (net/core/rtnetlink.c:3493) [ 32.352833][ T419] ? find_held_lock (kernel/locking/lockdep.c:5339) [ 32.353052][ T419] ? __lock_release (kernel/locking/lockdep.c:5525) [ 32.353260][ T419] ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/core/rtnetlink.c:6909) [ 32.353494][ T419] ? __pfx___lock_release (kernel/locking/lockdep.c:5501) [ 32.353718][ T419] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814) [ 32.353894][ T419] ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/core/rtnetlink.c:6909) [ 32.354083][ T419] ? __pfx_rtnl_dellink (net/core/rtnetlink.c:3493) [ 32.354252][ T419] rtnetlink_rcv_msg (net/core/rtnetlink.c:6911) [ 32.354424][ T419] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6814) [ 32.354639][ T419] ? 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) [ 32.354808][ T419] ? mark_lock (kernel/locking/lockdep.c:4727 (discriminator 3)) [ 32.354931][ T419] ? __lock_acquire (kernel/locking/lockdep.c:5226) [ 32.355096][ T419] netlink_rcv_skb (net/netlink/af_netlink.c:2543) [ 32.355260][ T419] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6814) [ 32.355481][ T419] ? __pfx_netlink_rcv_skb (net/netlink/af_netlink.c:2520) [ 32.355692][ T419] ? netlink_deliver_tap (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/netlink/af_netlink.c:340) [ 32.355860][ T419] ? 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) [ 32.356034][ T419] netlink_unicast (net/netlink/af_netlink.c:1322 net/netlink/af_netlink.c:1348) [ 32.356251][ T419] ? __pfx_netlink_unicast (net/netlink/af_netlink.c:1333) [ 32.356462][ T419] ? find_held_lock (kernel/locking/lockdep.c:5339) [ 32.356643][ T419] netlink_sendmsg (net/netlink/af_netlink.c:1892) [ 32.356849][ T419] ? __pfx_netlink_sendmsg (net/netlink/af_netlink.c:1811) [ 32.357019][ T419] ____sys_sendmsg (net/socket.c:711 net/socket.c:726 net/socket.c:2594) [ 32.357237][ T419] ? __pfx_____sys_sendmsg (net/socket.c:2540) [ 32.357417][ T419] ? __pfx_copy_msghdr_from_user (net/socket.c:2520) [ 32.357643][ T419] ___sys_sendmsg (net/socket.c:2650) [ 32.357808][ T419] ? __pfx____sys_sendmsg (net/socket.c:2637) [ 32.357970][ T419] ? kasan_save_stack (mm/kasan/common.c:49) [ 32.358193][ T419] ? kasan_save_stack (mm/kasan/common.c:48) [ 32.358396][ T419] ? __kasan_record_aux_stack (mm/kasan/generic.c:544) [ 32.358607][ T419] ? __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) [ 32.358820][ T419] ? __x64_sys_close (fs/open.c:1557 fs/open.c:1539 fs/open.c:1539) [ 32.358985][ T419] ? do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) [ 32.359152][ T419] ? entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) [ 32.359414][ T419] ? __lock_acquire (kernel/locking/lockdep.c:5226) [ 32.359589][ T419] ? find_held_lock (kernel/locking/lockdep.c:5339) [ 32.359751][ T419] ? __lock_release (kernel/locking/lockdep.c:5525) [ 32.359956][ T419] ? __virt_addr_valid (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:962 ./include/linux/mmzone.h:2058 arch/x86/mm/physaddr.c:65) [ 32.360194][ T419] ? __pfx___lock_release (kernel/locking/lockdep.c:5501) [ 32.360364][ T419] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814) [ 32.360536][ T419] __sys_sendmsg (net/socket.c:2680) [ 32.360757][ T419] ? __pfx___sys_sendmsg (net/socket.c:2665) [ 32.360919][ T419] ? __pfx_slab_free_after_rcu_debug (mm/slub.c:4643) [ 32.361183][ T419] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) [ 32.361347][ T419] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) [ 32.361576][ T419] RIP: 0033:0x7fec9a7d29a7 [ 32.361798][ T419] 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) [ 32.362432][ T419] RSP: 002b:00007ffc2c63a008 EFLAGS: 00000246 ORIG_RAX: 000000000000002e [ 32.362701][ T419] RAX: ffffffffffffffda RBX: 00007ffc2c63a730 RCX: 00007fec9a7d29a7 [ 32.362955][ T419] RDX: 0000000000000000 RSI: 00007ffc2c63a070 RDI: 0000000000000005 [ 32.363253][ T419] RBP: 0000000000000002 R08: 0000000000000003 R09: 0000000000000078 [ 32.363555][ T419] R10: 00007fec9a690ef8 R11: 0000000000000246 R12: 0000000000000002 Finger prints: print_deadlock_bug:validate_chain:__lock_acquire:down_read:blocking_notifier_call_chain