====================================== | [1342.755626][T17313] #0: ffffffffb55e7a48 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_dellink (net/core/rtnetlink.c:3521) | [1342.755890][T17313] #1: ffffffffb55d6630 ((netdev_chain).rwsem){++++}-{4:4}, at: blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368) | [ 1342.756189][T17313] | [ 1342.756189][T17313] stack backtrace: [ 1342.756592][T17313] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 1342.756779][T17313] Call Trace: [ 1342.756892][T17313] [1342.756971][T17313] dump_stack_lvl (lib/dump_stack.c:123) [1342.757126][T17313] print_deadlock_bug (kernel/locking/lockdep.c:3040) [1342.757275][T17313] validate_chain (kernel/locking/lockdep.c:3894) [1342.757426][T17313] ? __pfx_validate_chain (kernel/locking/lockdep.c:3860) [1342.757579][T17313] ? 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) [1342.757733][T17313] ? mark_lock (kernel/locking/lockdep.c:4727 (discriminator 3)) [1342.757847][T17313] __lock_acquire (kernel/locking/lockdep.c:5226) [1342.757995][T17313] lock_acquire.part.0 (kernel/locking/lockdep.c:467 kernel/locking/lockdep.c:5851) [1342.758141][T17313] ? blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368) [1342.758323][T17313] ? netconsole_process_cleanups_core (drivers/net/netconsole.c:242 (discriminator 11)) [1342.758506][T17313] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814) [1342.758654][T17313] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 37)) [1342.758806][T17313] ? lock_acquire (kernel/locking/lockdep.c:5822) [1342.758954][T17313] ? blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368) [1342.759134][T17313] down_read (./arch/x86/include/asm/preempt.h:79 kernel/locking/rwsem.c:1246 kernel/locking/rwsem.c:1261 kernel/locking/rwsem.c:1526) [1342.759245][T17313] ? blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368) [1342.759429][T17313] ? __pfx_down_read (kernel/locking/rwsem.c:1522) [1342.759577][T17313] ? __lock_release (kernel/locking/lockdep.c:5525) [1342.759729][T17313] ? netconsole_netdev_event (drivers/net/netconsole.c:1082) [1342.759877][T17313] ? __pfx___lock_release (kernel/locking/lockdep.c:5501) [1342.760029][T17313] blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368) [1342.760177][T17313] __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)) [1342.760323][T17313] ? __pfx___netdev_upper_dev_unlink (net/core/dev.c:8151) [1342.760504][T17313] ? __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) [1342.760652][T17313] ? __pfx___mutex_unlock_slowpath (kernel/locking/mutex.c:890) [1342.760833][T17313] ? rtnl_is_locked (net/core/rtnetlink.c:163) [1342.760985][T17313] netdev_upper_dev_unlink (net/core/dev.c:8190) [1342.761131][T17313] ? __pfx_netdev_upper_dev_unlink (net/core/dev.c:8190) [1342.761318][T17313] ? netconsole_netdev_event (drivers/net/netconsole.c:1082) [1342.761464][T17313] ? 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) [1342.761617][T17313] ? rtnl_is_locked (net/core/rtnetlink.c:163) [1342.761766][T17313] ? netdev_master_upper_dev_get (net/core/dev.c:7230) [1342.761948][T17313] vrf_device_event (drivers/net/vrf.c:1110 drivers/net/vrf.c:1119 drivers/net/vrf.c:1804) vrf [1342.762102][T17313] notifier_call_chain (kernel/notifier.c:85 (discriminator 2)) [1342.762252][T17313] blocking_notifier_call_chain (kernel/notifier.c:381 kernel/notifier.c:368) [1342.762400][T17313] unregister_netdevice_many_notify (net/core/dev.c:11575) [1342.762584][T17313] ? 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) [1342.762760][T17313] ? mark_lock (kernel/locking/lockdep.c:4727 (discriminator 3)) [1342.762872][T17313] ? __pfx_unregister_netdevice_many_notify (net/core/dev.c:11516) [1342.763056][T17313] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4347 kernel/locking/lockdep.c:4406) [1342.763250][T17313] ? kfree (mm/slub.c:4613 mm/slub.c:4761) [1342.763361][T17313] ? vlan_vid_del (net/8021q/vlan_core.c:368 net/8021q/vlan_core.c:387) [1342.763509][T17313] ? vlan_vid_del (net/8021q/vlan_core.c:368 net/8021q/vlan_core.c:387) [1342.763660][T17313] rtnl_dellink (net/core/rtnetlink.c:3487 net/core/rtnetlink.c:3527) [1342.763812][T17313] ? __pfx_rtnl_dellink (net/core/rtnetlink.c:3493) [1342.763975][T17313] ? find_held_lock (kernel/locking/lockdep.c:5339) [1342.764127][T17313] ? __lock_release (kernel/locking/lockdep.c:5525) [1342.764276][T17313] ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/core/rtnetlink.c:6909) [1342.764427][T17313] ? __pfx___lock_release (kernel/locking/lockdep.c:5501) [1342.764572][T17313] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814) [1342.764719][T17313] ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/core/rtnetlink.c:6909) [1342.764874][T17313] ? __pfx_rtnl_dellink (net/core/rtnetlink.c:3493) [1342.765025][T17313] rtnetlink_rcv_msg (net/core/rtnetlink.c:6911) [1342.765171][T17313] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6814) [1342.765322][T17313] ? 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) [1342.765469][T17313] ? mark_lock (kernel/locking/lockdep.c:4727 (discriminator 3)) [1342.765581][T17313] ? __lock_acquire (kernel/locking/lockdep.c:5226) [1342.765732][T17313] netlink_rcv_skb (net/netlink/af_netlink.c:2543) [1342.765881][T17313] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6814) [1342.766028][T17313] ? __pfx_netlink_rcv_skb (net/netlink/af_netlink.c:2520) [1342.766179][T17313] ? netlink_deliver_tap (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/netlink/af_netlink.c:340) [1342.766329][T17313] ? 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) [1342.766483][T17313] netlink_unicast (net/netlink/af_netlink.c:1322 net/netlink/af_netlink.c:1348) [1342.766635][T17313] ? __pfx_netlink_unicast (net/netlink/af_netlink.c:1333) [1342.766783][T17313] ? find_held_lock (kernel/locking/lockdep.c:5339) [1342.766931][T17313] netlink_sendmsg (net/netlink/af_netlink.c:1892) [1342.767076][T17313] ? __pfx_netlink_sendmsg (net/netlink/af_netlink.c:1811) [1342.767225][T17313] ____sys_sendmsg (net/socket.c:711 net/socket.c:726 net/socket.c:2594) [1342.767373][T17313] ? __pfx_____sys_sendmsg (net/socket.c:2540) [1342.767522][T17313] ? __pfx_copy_msghdr_from_user (net/socket.c:2520) [1342.767710][T17313] ___sys_sendmsg (net/socket.c:2650) [1342.767860][T17313] ? __pfx____sys_sendmsg (net/socket.c:2637) [1342.768006][T17313] ? kasan_save_stack (mm/kasan/common.c:49) [1342.768152][T17313] ? kasan_save_stack (mm/kasan/common.c:48) [1342.768297][T17313] ? __kasan_record_aux_stack (mm/kasan/generic.c:544) [1342.768445][T17313] ? __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) [1342.768634][T17313] ? __x64_sys_close (fs/open.c:1557 fs/open.c:1539 fs/open.c:1539) [1342.768781][T17313] ? do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) [1342.768929][T17313] ? entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) [1342.769116][T17313] ? __lock_acquire (kernel/locking/lockdep.c:5226) [1342.769267][T17313] ? find_held_lock (kernel/locking/lockdep.c:5339) [1342.769415][T17313] ? __lock_release (kernel/locking/lockdep.c:5525) [1342.769564][T17313] ? __virt_addr_valid (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:962 ./include/linux/mmzone.h:2058 arch/x86/mm/physaddr.c:65) [1342.769715][T17313] ? __pfx___lock_release (kernel/locking/lockdep.c:5501) [1342.769861][T17313] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814) [1342.770007][T17313] __sys_sendmsg (net/socket.c:2680) [1342.770155][T17313] ? __pfx___sys_sendmsg (net/socket.c:2665) [1342.770301][T17313] ? __pfx_slab_free_after_rcu_debug (mm/slub.c:4643) [1342.770489][T17313] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) [1342.770635][T17313] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) [ 1342.770825][T17313] RIP: 0033:0x7fe44c3239a7 [ 1342.770982][T17313] 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) [ 1342.771496][T17313] RSP: 002b:00007ffed0182918 EFLAGS: 00000246 ORIG_RAX: 000000000000002e [ 1342.771723][T17313] RAX: ffffffffffffffda RBX: 00007ffed0183040 RCX: 00007fe44c3239a7 [ 1342.771956][T17313] RDX: 0000000000000000 RSI: 00007ffed0182980 RDI: 0000000000000005 [ 1342.772179][T17313] RBP: 0000000000000002 R08: 0000000000000003 R09: 0000000000000078 [ 1342.772399][T17313] R10: 00007fe44c1e1ef8 R11: 0000000000000246 R12: 0000000000000002 Finger prints: print_deadlock_bug:validate_chain:__lock_acquire:down_read:blocking_notifier_call_chain