====================================== | [ 140.539167][ T803] #0: ffffffffa63e7a48 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_dellink (net/core/rtnetlink.c:3512) | [ 140.539444][ T803] #1: ffffffffa63d6630 ((netdev_chain).rwsem){++++}-{4:4}, at: blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368) | [ 140.539745][ T803] | [ 140.539745][ T803] stack backtrace: [ 140.540144][ T803] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 140.540337][ T803] Call Trace: [ 140.540449][ T803] [ 140.540527][ T803] dump_stack_lvl (lib/dump_stack.c:123) [ 140.540680][ T803] print_deadlock_bug (kernel/locking/lockdep.c:3040) [ 140.540830][ T803] validate_chain (kernel/locking/lockdep.c:3894) [ 140.540979][ T803] ? __pfx_validate_chain (kernel/locking/lockdep.c:3860) [ 140.541133][ T803] ? 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) [ 140.541288][ T803] ? mark_lock (kernel/locking/lockdep.c:4727 (discriminator 3)) [ 140.541404][ T803] __lock_acquire (kernel/locking/lockdep.c:5226) [ 140.541554][ T803] lock_acquire.part.0 (kernel/locking/lockdep.c:467 kernel/locking/lockdep.c:5851) [ 140.541707][ T803] ? blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368) [ 140.541890][ T803] ? netconsole_process_cleanups_core (drivers/net/netconsole.c:242 (discriminator 11)) [ 140.542075][ T803] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814) [ 140.542227][ T803] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 37)) [ 140.542404][ T803] ? lock_acquire (kernel/locking/lockdep.c:5822) [ 140.542554][ T803] ? blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368) [ 140.542739][ T803] down_read (./arch/x86/include/asm/preempt.h:79 kernel/locking/rwsem.c:1246 kernel/locking/rwsem.c:1261 kernel/locking/rwsem.c:1526) [ 140.542851][ T803] ? blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368) [ 140.543037][ T803] ? __pfx_down_read (kernel/locking/rwsem.c:1522) [ 140.543186][ T803] ? __lock_release (kernel/locking/lockdep.c:5525) [ 140.543348][ T803] ? netconsole_netdev_event (drivers/net/netconsole.c:1082) [ 140.543500][ T803] ? __pfx___lock_release (kernel/locking/lockdep.c:5501) [ 140.543657][ T803] blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368) [ 140.543808][ T803] __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)) [ 140.543957][ T803] ? __pfx___netdev_upper_dev_unlink (net/core/dev.c:8151) [ 140.544138][ T803] ? __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) [ 140.544291][ T803] ? __pfx___mutex_unlock_slowpath (kernel/locking/mutex.c:890) [ 140.544484][ T803] ? rtnl_is_locked (net/core/rtnetlink.c:164) [ 140.544644][ T803] netdev_upper_dev_unlink (net/core/dev.c:8190) [ 140.544792][ T803] ? __pfx_netdev_upper_dev_unlink (net/core/dev.c:8190) [ 140.544977][ T803] ? netconsole_netdev_event (drivers/net/netconsole.c:1082) [ 140.545130][ T803] ? 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) [ 140.545284][ T803] ? rtnl_is_locked (net/core/rtnetlink.c:164) [ 140.545439][ T803] ? netdev_master_upper_dev_get (net/core/dev.c:7230) [ 140.545625][ T803] vrf_device_event (drivers/net/vrf.c:1110 drivers/net/vrf.c:1119 drivers/net/vrf.c:1804) vrf [ 140.545788][ T803] notifier_call_chain (kernel/notifier.c:85 (discriminator 2)) [ 140.545936][ T803] blocking_notifier_call_chain (kernel/notifier.c:381 kernel/notifier.c:368) [ 140.546083][ T803] unregister_netdevice_many_notify (net/core/dev.c:11571) [ 140.546266][ T803] ? 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) [ 140.546423][ T803] ? mark_lock (kernel/locking/lockdep.c:4727 (discriminator 3)) [ 140.546540][ T803] ? __pfx_unregister_netdevice_many_notify (net/core/dev.c:11512) [ 140.546744][ T803] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4347 kernel/locking/lockdep.c:4406) [ 140.546938][ T803] ? kfree (mm/slub.c:4613 mm/slub.c:4761) [ 140.547053][ T803] ? vlan_vid_del (net/8021q/vlan_core.c:368 net/8021q/vlan_core.c:387) [ 140.547208][ T803] ? vlan_vid_del (net/8021q/vlan_core.c:368 net/8021q/vlan_core.c:387) [ 140.547395][ T803] rtnl_dellink (net/core/rtnetlink.c:3478 net/core/rtnetlink.c:3518) [ 140.547572][ T803] ? __pfx_rtnl_dellink (net/core/rtnetlink.c:3484) [ 140.547736][ T803] ? find_held_lock (kernel/locking/lockdep.c:5339) [ 140.547891][ T803] ? __lock_release (kernel/locking/lockdep.c:5525) [ 140.548035][ T803] ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/core/rtnetlink.c:6900) [ 140.548193][ T803] ? __pfx___lock_release (kernel/locking/lockdep.c:5501) [ 140.548368][ T803] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814) [ 140.548581][ T803] ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/core/rtnetlink.c:6900) [ 140.548799][ T803] ? __pfx_rtnl_dellink (net/core/rtnetlink.c:3484) [ 140.549021][ T803] rtnetlink_rcv_msg (net/core/rtnetlink.c:6902) [ 140.549239][ T803] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6805) [ 140.549461][ T803] ? 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) [ 140.549690][ T803] ? mark_lock (kernel/locking/lockdep.c:4727 (discriminator 3)) [ 140.549862][ T803] ? __lock_acquire (kernel/locking/lockdep.c:5226) [ 140.550089][ T803] netlink_rcv_skb (net/netlink/af_netlink.c:2543) [ 140.550317][ T803] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6805) [ 140.550545][ T803] ? __pfx_netlink_rcv_skb (net/netlink/af_netlink.c:2520) [ 140.550780][ T803] ? netlink_deliver_tap (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/netlink/af_netlink.c:340) [ 140.551015][ T803] ? 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) [ 140.551245][ T803] netlink_unicast (net/netlink/af_netlink.c:1322 net/netlink/af_netlink.c:1348) [ 140.551475][ T803] ? __pfx_netlink_unicast (net/netlink/af_netlink.c:1333) [ 140.551706][ T803] ? find_held_lock (kernel/locking/lockdep.c:5339) [ 140.551942][ T803] netlink_sendmsg (net/netlink/af_netlink.c:1892) [ 140.552166][ T803] ? __pfx_netlink_sendmsg (net/netlink/af_netlink.c:1811) [ 140.552360][ T803] ____sys_sendmsg (net/socket.c:711 net/socket.c:726 net/socket.c:2594) [ 140.552562][ T803] ? __pfx_____sys_sendmsg (net/socket.c:2540) [ 140.552738][ T803] ? __pfx_copy_msghdr_from_user (net/socket.c:2520) [ 140.552927][ T803] ___sys_sendmsg (net/socket.c:2650) [ 140.553081][ T803] ? __pfx____sys_sendmsg (net/socket.c:2637) [ 140.553230][ T803] ? kasan_save_stack (mm/kasan/common.c:49) [ 140.553388][ T803] ? kasan_save_stack (mm/kasan/common.c:48) [ 140.553535][ T803] ? __kasan_record_aux_stack (mm/kasan/generic.c:544) [ 140.553684][ T803] ? __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) [ 140.553879][ T803] ? __x64_sys_close (fs/open.c:1557 fs/open.c:1539 fs/open.c:1539) [ 140.554029][ T803] ? do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) [ 140.554184][ T803] ? entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) [ 140.554377][ T803] ? __lock_acquire (kernel/locking/lockdep.c:5226) [ 140.554534][ T803] ? find_held_lock (kernel/locking/lockdep.c:5339) [ 140.554683][ T803] ? __lock_release (kernel/locking/lockdep.c:5525) [ 140.554830][ T803] ? __virt_addr_valid (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:962 ./include/linux/mmzone.h:2058 arch/x86/mm/physaddr.c:65) [ 140.554982][ T803] ? __pfx___lock_release (kernel/locking/lockdep.c:5501) [ 140.555129][ T803] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814) [ 140.555279][ T803] __sys_sendmsg (net/socket.c:2680) [ 140.555436][ T803] ? __pfx___sys_sendmsg (net/socket.c:2665) [ 140.555583][ T803] ? __pfx_slab_free_after_rcu_debug (mm/slub.c:4643) [ 140.555773][ T803] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) [ 140.555919][ T803] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) [ 140.556115][ T803] RIP: 0033:0x7f53ad6aa9a7 [ 140.556274][ T803] 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) [ 140.556805][ T803] RSP: 002b:00007ffc0709ccb8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e [ 140.557029][ T803] RAX: ffffffffffffffda RBX: 00007ffc0709d3e0 RCX: 00007f53ad6aa9a7 [ 140.557256][ T803] RDX: 0000000000000000 RSI: 00007ffc0709cd20 RDI: 0000000000000005 [ 140.557488][ T803] RBP: 0000000000000002 R08: 0000000000000003 R09: 0000000000000078 [ 140.557711][ T803] R10: 00007f53ad568ef8 R11: 0000000000000246 R12: 0000000000000002 Finger prints: print_deadlock_bug:validate_chain:__lock_acquire:down_read:blocking_notifier_call_chain