====================================== | [ 77.245366][ T792] #0: ffffffffbbfe7a48 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_dellink (net/core/rtnetlink.c:3521) | [ 77.245636][ T792] #1: ffffffffbbfd6630 ((netdev_chain).rwsem){++++}-{4:4}, at: blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368) | [ 77.245938][ T792] | [ 77.245938][ T792] stack backtrace: [ 77.246351][ T792] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 77.246535][ T792] Call Trace: [ 77.246646][ T792] [ 77.246723][ T792] dump_stack_lvl (lib/dump_stack.c:123) [ 77.246890][ T792] print_deadlock_bug (kernel/locking/lockdep.c:3040) [ 77.247056][ T792] validate_chain (kernel/locking/lockdep.c:3894) [ 77.247206][ T792] ? __pfx_validate_chain (kernel/locking/lockdep.c:3860) [ 77.247358][ T792] ? 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) [ 77.247503][ T792] ? mark_lock (kernel/locking/lockdep.c:4727 (discriminator 3)) [ 77.247617][ T792] __lock_acquire (kernel/locking/lockdep.c:5226) [ 77.247772][ T792] lock_acquire.part.0 (kernel/locking/lockdep.c:467 kernel/locking/lockdep.c:5851) [ 77.247927][ T792] ? blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368) [ 77.248110][ T792] ? netconsole_process_cleanups_core (drivers/net/netconsole.c:242 (discriminator 11)) [ 77.248299][ T792] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814) [ 77.248446][ T792] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 37)) [ 77.248593][ T792] ? lock_acquire (kernel/locking/lockdep.c:5822) [ 77.248739][ T792] ? blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368) [ 77.248922][ T792] down_read (./arch/x86/include/asm/preempt.h:79 kernel/locking/rwsem.c:1246 kernel/locking/rwsem.c:1261 kernel/locking/rwsem.c:1526) [ 77.249037][ T792] ? blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368) [ 77.249218][ T792] ? __pfx_down_read (kernel/locking/rwsem.c:1522) [ 77.249432][ T792] ? __lock_release (kernel/locking/lockdep.c:5525) [ 77.249631][ T792] ? netconsole_netdev_event (drivers/net/netconsole.c:1082) [ 77.249806][ T792] ? __pfx___lock_release (kernel/locking/lockdep.c:5501) [ 77.249981][ T792] blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368) [ 77.250151][ T792] __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)) [ 77.250328][ T792] ? __pfx___netdev_upper_dev_unlink (net/core/dev.c:8151) [ 77.250537][ T792] ? __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) [ 77.250711][ T792] ? __pfx___mutex_unlock_slowpath (kernel/locking/mutex.c:890) [ 77.250921][ T792] ? rtnl_is_locked (net/core/rtnetlink.c:163) [ 77.251098][ T792] netdev_upper_dev_unlink (net/core/dev.c:8190) [ 77.251268][ T792] ? __pfx_netdev_upper_dev_unlink (net/core/dev.c:8190) [ 77.251488][ T792] ? netconsole_netdev_event (drivers/net/netconsole.c:1082) [ 77.251660][ T792] ? 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) [ 77.251831][ T792] ? rtnl_is_locked (net/core/rtnetlink.c:163) [ 77.252004][ T792] ? netdev_master_upper_dev_get (net/core/dev.c:7230) [ 77.252219][ T792] vrf_device_event (drivers/net/vrf.c:1110 drivers/net/vrf.c:1119 drivers/net/vrf.c:1804) vrf [ 77.252396][ T792] notifier_call_chain (kernel/notifier.c:85 (discriminator 2)) [ 77.252568][ T792] blocking_notifier_call_chain (kernel/notifier.c:381 kernel/notifier.c:368) [ 77.252745][ T792] unregister_netdevice_many_notify (net/core/dev.c:11575) [ 77.252958][ T792] ? 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) [ 77.253127][ T792] ? mark_lock (kernel/locking/lockdep.c:4727 (discriminator 3)) [ 77.253253][ T792] ? __pfx_unregister_netdevice_many_notify (net/core/dev.c:11516) [ 77.253467][ T792] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4347 kernel/locking/lockdep.c:4406) [ 77.253678][ T792] ? kfree (mm/slub.c:4613 mm/slub.c:4761) [ 77.253809][ T792] ? vlan_vid_del (net/8021q/vlan_core.c:368 net/8021q/vlan_core.c:387) [ 77.253985][ T792] ? vlan_vid_del (net/8021q/vlan_core.c:368 net/8021q/vlan_core.c:387) [ 77.254154][ T792] rtnl_dellink (net/core/rtnetlink.c:3487 net/core/rtnetlink.c:3527) [ 77.254327][ T792] ? __pfx_rtnl_dellink (net/core/rtnetlink.c:3493) [ 77.254511][ T792] ? find_held_lock (kernel/locking/lockdep.c:5339) [ 77.254683][ T792] ? __lock_release (kernel/locking/lockdep.c:5525) [ 77.254856][ T792] ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/core/rtnetlink.c:6909) [ 77.255026][ T792] ? __pfx___lock_release (kernel/locking/lockdep.c:5501) [ 77.255197][ T792] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814) [ 77.255373][ T792] ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/core/rtnetlink.c:6909) [ 77.255544][ T792] ? __pfx_rtnl_dellink (net/core/rtnetlink.c:3493) [ 77.255714][ T792] rtnetlink_rcv_msg (net/core/rtnetlink.c:6911) [ 77.255886][ T792] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6814) [ 77.256056][ T792] ? 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) [ 77.256231][ T792] ? mark_lock (kernel/locking/lockdep.c:4727 (discriminator 3)) [ 77.256362][ T792] ? __lock_acquire (kernel/locking/lockdep.c:5226) [ 77.256541][ T792] netlink_rcv_skb (net/netlink/af_netlink.c:2543) [ 77.256712][ T792] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6814) [ 77.256886][ T792] ? __pfx_netlink_rcv_skb (net/netlink/af_netlink.c:2520) [ 77.257061][ T792] ? netlink_deliver_tap (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/netlink/af_netlink.c:340) [ 77.257234][ T792] ? 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) [ 77.257403][ T792] netlink_unicast (net/netlink/af_netlink.c:1322 net/netlink/af_netlink.c:1348) [ 77.257572][ T792] ? __pfx_netlink_unicast (net/netlink/af_netlink.c:1333) [ 77.257743][ T792] ? find_held_lock (kernel/locking/lockdep.c:5339) [ 77.257912][ T792] netlink_sendmsg (net/netlink/af_netlink.c:1892) [ 77.258082][ T792] ? __pfx_netlink_sendmsg (net/netlink/af_netlink.c:1811) [ 77.258253][ T792] ____sys_sendmsg (net/socket.c:711 net/socket.c:726 net/socket.c:2594) [ 77.258426][ T792] ? __pfx_____sys_sendmsg (net/socket.c:2540) [ 77.258600][ T792] ? __pfx_copy_msghdr_from_user (net/socket.c:2520) [ 77.258820][ T792] ___sys_sendmsg (net/socket.c:2650) [ 77.259000][ T792] ? __pfx____sys_sendmsg (net/socket.c:2637) [ 77.259176][ T792] ? kasan_save_stack (mm/kasan/common.c:49) [ 77.259361][ T792] ? kasan_save_stack (mm/kasan/common.c:48) [ 77.259535][ T792] ? __kasan_record_aux_stack (mm/kasan/generic.c:544) [ 77.259709][ T792] ? __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) [ 77.259919][ T792] ? __x64_sys_close (fs/open.c:1557 fs/open.c:1539 fs/open.c:1539) [ 77.260081][ T792] ? do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) [ 77.260245][ T792] ? entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) [ 77.260449][ T792] ? __lock_acquire (kernel/locking/lockdep.c:5226) [ 77.260611][ T792] ? find_held_lock (kernel/locking/lockdep.c:5339) [ 77.260771][ T792] ? __lock_release (kernel/locking/lockdep.c:5525) [ 77.260934][ T792] ? __virt_addr_valid (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:962 ./include/linux/mmzone.h:2058 arch/x86/mm/physaddr.c:65) [ 77.261097][ T792] ? __pfx___lock_release (kernel/locking/lockdep.c:5501) [ 77.261260][ T792] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814) [ 77.261428][ T792] __sys_sendmsg (net/socket.c:2680) [ 77.261591][ T792] ? __pfx___sys_sendmsg (net/socket.c:2665) [ 77.261751][ T792] ? __pfx_slab_free_after_rcu_debug (mm/slub.c:4643) [ 77.261957][ T792] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) [ 77.262118][ T792] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) [ 77.262318][ T792] RIP: 0033:0x7efed5a629a7 [ 77.262494][ T792] 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) [ 77.263063][ T792] RSP: 002b:00007ffd3d809e68 EFLAGS: 00000246 ORIG_RAX: 000000000000002e [ 77.263309][ T792] RAX: ffffffffffffffda RBX: 00007ffd3d80a590 RCX: 00007efed5a629a7 [ 77.263554][ T792] RDX: 0000000000000000 RSI: 00007ffd3d809ed0 RDI: 0000000000000005 [ 77.263798][ T792] RBP: 0000000000000002 R08: 0000000000000003 R09: 0000000000000078 [ 77.264040][ T792] R10: 00007efed5920ef8 R11: 0000000000000246 R12: 0000000000000002 Finger prints: print_deadlock_bug:validate_chain:__lock_acquire:down_read:blocking_notifier_call_chain