======================================
| [ 25.507845][ T375] #0: ffffffffbbde7a48 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_dellink (net/core/rtnetlink.c:3521)
| [ 25.508122][ T375] #1: ffffffffbbdd6630 ((netdev_chain).rwsem){++++}-{4:4}, at: blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368)
| [ 25.508429][ T375]
| [ 25.508429][ T375] stack backtrace:
[ 25.508841][ T375] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 25.509035][ T375] Call Trace:
[ 25.509156][ T375] <TASK>
[ 25.509237][ T375] dump_stack_lvl (lib/dump_stack.c:123)
[ 25.509395][ T375] print_deadlock_bug (kernel/locking/lockdep.c:3040)
[ 25.509546][ T375] validate_chain (kernel/locking/lockdep.c:3894)
[ 25.509697][ T375] ? __pfx_validate_chain (kernel/locking/lockdep.c:3860)
[ 25.509848][ T375] ? 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)
[ 25.509997][ T375] ? mark_lock (kernel/locking/lockdep.c:4727 (discriminator 3))
[ 25.510119][ T375] __lock_acquire (kernel/locking/lockdep.c:5226)
[ 25.510272][ T375] lock_acquire.part.0 (kernel/locking/lockdep.c:467 kernel/locking/lockdep.c:5851)
[ 25.510424][ T375] ? blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368)
[ 25.510609][ T375] ? netconsole_process_cleanups_core (drivers/net/netconsole.c:242 (discriminator 11))
[ 25.510802][ T375] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814)
[ 25.510953][ T375] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 37))
[ 25.511107][ T375] ? lock_acquire (kernel/locking/lockdep.c:5822)
[ 25.511259][ T375] ? blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368)
[ 25.511445][ T375] down_read (./arch/x86/include/asm/preempt.h:79 kernel/locking/rwsem.c:1246 kernel/locking/rwsem.c:1261 kernel/locking/rwsem.c:1526)
[ 25.511559][ T375] ? blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368)
[ 25.511745][ T375] ? __pfx_down_read (kernel/locking/rwsem.c:1522)
[ 25.511894][ T375] ? __lock_release (kernel/locking/lockdep.c:5525)
[ 25.512043][ T375] ? netconsole_netdev_event (drivers/net/netconsole.c:1082)
[ 25.512202][ T375] ? __pfx___lock_release (kernel/locking/lockdep.c:5501)
[ 25.512355][ T375] blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368)
[ 25.512505][ T375] __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))
[ 25.512656][ T375] ? __pfx___netdev_upper_dev_unlink (net/core/dev.c:8151)
[ 25.512844][ T375] ? __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)
[ 25.512995][ T375] ? __pfx___mutex_unlock_slowpath (kernel/locking/mutex.c:890)
[ 25.513178][ T375] ? rtnl_is_locked (net/core/rtnetlink.c:163)
[ 25.513335][ T375] netdev_upper_dev_unlink (net/core/dev.c:8190)
[ 25.513492][ T375] ? __pfx_netdev_upper_dev_unlink (net/core/dev.c:8190)
[ 25.513685][ T375] ? netconsole_netdev_event (drivers/net/netconsole.c:1082)
[ 25.513846][ T375] ? 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)
[ 25.513995][ T375] ? rtnl_is_locked (net/core/rtnetlink.c:163)
[ 25.514143][ T375] ? netdev_master_upper_dev_get (net/core/dev.c:7230)
[ 25.514329][ T375] vrf_device_event (drivers/net/vrf.c:1110 drivers/net/vrf.c:1119 drivers/net/vrf.c:1804) vrf
[ 25.514483][ T375] notifier_call_chain (kernel/notifier.c:85 (discriminator 2))
[ 25.514643][ T375] blocking_notifier_call_chain (kernel/notifier.c:381 kernel/notifier.c:368)
[ 25.514791][ T375] unregister_netdevice_many_notify (net/core/dev.c:11575)
[ 25.514973][ T375] ? __lock_release (kernel/locking/lockdep.c:5525)
[ 25.515120][ T375] ? __pfx___lock_release (kernel/locking/lockdep.c:5501)
[ 25.515269][ T375] ? __pfx_unregister_netdevice_many_notify (net/core/dev.c:11516)
[ 25.515453][ T375] ? 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)
[ 25.515609][ T375] ? mark_held_locks (kernel/locking/lockdep.c:4321)
[ 25.515760][ T375] ? __pfx_vlan_info_rcu_free (net/8021q/vlan_core.c:145)
[ 25.515912][ T375] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4347 kernel/locking/lockdep.c:4406)
[ 25.516098][ T375] rtnl_dellink (net/core/rtnetlink.c:3487 net/core/rtnetlink.c:3527)
[ 25.516250][ T375] ? __pfx_rtnl_dellink (net/core/rtnetlink.c:3493)
[ 25.516416][ T375] ? find_held_lock (kernel/locking/lockdep.c:5339)
[ 25.516566][ T375] ? __lock_release (kernel/locking/lockdep.c:5525)
[ 25.516717][ T375] ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/core/rtnetlink.c:6909)
[ 25.516875][ T375] ? __pfx___lock_release (kernel/locking/lockdep.c:5501)
[ 25.517023][ T375] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814)
[ 25.517179][ T375] ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/core/rtnetlink.c:6909)
[ 25.517330][ T375] ? __pfx_rtnl_dellink (net/core/rtnetlink.c:3493)
[ 25.517480][ T375] rtnetlink_rcv_msg (net/core/rtnetlink.c:6911)
[ 25.517631][ T375] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6814)
[ 25.517781][ T375] ? 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)
[ 25.517933][ T375] ? mark_lock (kernel/locking/lockdep.c:4727 (discriminator 3))
[ 25.518044][ T375] ? __lock_acquire (kernel/locking/lockdep.c:5226)
[ 25.518199][ T375] netlink_rcv_skb (net/netlink/af_netlink.c:2543)
[ 25.518351][ T375] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6814)
[ 25.518498][ T375] ? __pfx_netlink_rcv_skb (net/netlink/af_netlink.c:2520)
[ 25.518648][ T375] ? netlink_deliver_tap (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/netlink/af_netlink.c:340)
[ 25.518798][ T375] ? 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)
[ 25.518953][ T375] netlink_unicast (net/netlink/af_netlink.c:1322 net/netlink/af_netlink.c:1348)
[ 25.519103][ T375] ? __pfx_netlink_unicast (net/netlink/af_netlink.c:1333)
[ 25.519249][ T375] ? find_held_lock (kernel/locking/lockdep.c:5339)
[ 25.519430][ T375] netlink_sendmsg (net/netlink/af_netlink.c:1892)
[ 25.519593][ T375] ? __pfx_netlink_sendmsg (net/netlink/af_netlink.c:1811)
[ 25.519743][ T375] ____sys_sendmsg (net/socket.c:711 net/socket.c:726 net/socket.c:2594)
[ 25.519891][ T375] ? __pfx_____sys_sendmsg (net/socket.c:2540)
[ 25.520045][ T375] ? __pfx_copy_msghdr_from_user (net/socket.c:2520)
[ 25.520232][ T375] ___sys_sendmsg (net/socket.c:2650)
[ 25.520378][ T375] ? __pfx____sys_sendmsg (net/socket.c:2637)
[ 25.520527][ T375] ? kasan_save_stack (mm/kasan/common.c:49)
[ 25.520679][ T375] ? kasan_save_stack (mm/kasan/common.c:48)
[ 25.520826][ T375] ? __kasan_record_aux_stack (mm/kasan/generic.c:544)
[ 25.520975][ T375] ? __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)
[ 25.521167][ T375] ? __x64_sys_close (fs/open.c:1557 fs/open.c:1539 fs/open.c:1539)
[ 25.521315][ T375] ? do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83)
[ 25.521464][ T375] ? entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[ 25.521653][ T375] ? __lock_acquire (kernel/locking/lockdep.c:5226)
[ 25.521804][ T375] ? find_held_lock (kernel/locking/lockdep.c:5339)
[ 25.521955][ T375] ? __lock_release (kernel/locking/lockdep.c:5525)
[ 25.522104][ T375] ? __virt_addr_valid (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:962 ./include/linux/mmzone.h:2058 arch/x86/mm/physaddr.c:65)
[ 25.522254][ T375] ? __pfx___lock_release (kernel/locking/lockdep.c:5501)
[ 25.522409][ T375] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814)
[ 25.522559][ T375] __sys_sendmsg (net/socket.c:2680)
[ 25.522707][ T375] ? __pfx___sys_sendmsg (net/socket.c:2665)
[ 25.522853][ T375] ? __pfx_slab_free_after_rcu_debug (mm/slub.c:4643)
[ 25.523044][ T375] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83)
[ 25.523189][ T375] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[ 25.523377][ T375] RIP: 0033:0x7fb45d7739a7
[ 25.523535][ T375] 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)
[ 25.524074][ T375] RSP: 002b:00007ffd9b535d38 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[ 25.524301][ T375] RAX: ffffffffffffffda RBX: 00007ffd9b536460 RCX: 00007fb45d7739a7
[ 25.524536][ T375] RDX: 0000000000000000 RSI: 00007ffd9b535da0 RDI: 0000000000000005
[ 25.524762][ T375] RBP: 0000000000000002 R08: 0000000000000003 R09: 0000000000000078
[ 25.524982][ T375] R10: 00007fb45d631ef8 R11: 0000000000000246 R12: 0000000000000002
Finger prints:
print_deadlock_bug:validate_chain:__lock_acquire:down_read:blocking_notifier_call_chain