======================================
| [ 45.267211][ T482] #0: ffffffff8bfe7a48 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_dellink (net/core/rtnetlink.c:3521)
| [ 45.267478][ T482] #1: ffffffff8bfd6630 ((netdev_chain).rwsem){++++}-{4:4}, at: blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368)
| [ 45.267775][ T482]
| [ 45.267775][ T482] stack backtrace:
[ 45.268182][ T482] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 45.268366][ T482] Call Trace:
[ 45.268481][ T482] <TASK>
[ 45.268560][ T482] dump_stack_lvl (lib/dump_stack.c:123)
[ 45.268716][ T482] print_deadlock_bug (kernel/locking/lockdep.c:3040)
[ 45.268864][ T482] validate_chain (kernel/locking/lockdep.c:3894)
[ 45.269015][ T482] ? __pfx_validate_chain (kernel/locking/lockdep.c:3860)
[ 45.269170][ T482] ? 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)
[ 45.269318][ T482] ? mark_lock (kernel/locking/lockdep.c:4727 (discriminator 3))
[ 45.269431][ T482] __lock_acquire (kernel/locking/lockdep.c:5226)
[ 45.269583][ T482] lock_acquire.part.0 (kernel/locking/lockdep.c:467 kernel/locking/lockdep.c:5851)
[ 45.269736][ T482] ? blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368)
[ 45.269919][ T482] ? netconsole_process_cleanups_core (drivers/net/netconsole.c:242 (discriminator 11))
[ 45.270104][ T482] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814)
[ 45.270258][ T482] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 37))
[ 45.270406][ T482] ? lock_acquire (kernel/locking/lockdep.c:5822)
[ 45.270553][ T482] ? blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368)
[ 45.270738][ T482] down_read (./arch/x86/include/asm/preempt.h:79 kernel/locking/rwsem.c:1246 kernel/locking/rwsem.c:1261 kernel/locking/rwsem.c:1526)
[ 45.270850][ T482] ? blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368)
[ 45.271031][ T482] ? __pfx_down_read (kernel/locking/rwsem.c:1522)
[ 45.271176][ T482] ? __lock_release (kernel/locking/lockdep.c:5525)
[ 45.271331][ T482] ? netconsole_netdev_event (drivers/net/netconsole.c:1082)
[ 45.271479][ T482] ? __pfx___lock_release (kernel/locking/lockdep.c:5501)
[ 45.271626][ T482] blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368)
[ 45.271780][ T482] __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))
[ 45.271928][ T482] ? __pfx___netdev_upper_dev_unlink (net/core/dev.c:8151)
[ 45.272111][ T482] ? __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)
[ 45.272259][ T482] ? __pfx___mutex_unlock_slowpath (kernel/locking/mutex.c:890)
[ 45.272445][ T482] ? rtnl_is_locked (net/core/rtnetlink.c:163)
[ 45.272597][ T482] netdev_upper_dev_unlink (net/core/dev.c:8190)
[ 45.272743][ T482] ? __pfx_netdev_upper_dev_unlink (net/core/dev.c:8190)
[ 45.272931][ T482] ? netconsole_netdev_event (drivers/net/netconsole.c:1082)
[ 45.273078][ T482] ? 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)
[ 45.273227][ T482] ? rtnl_is_locked (net/core/rtnetlink.c:163)
[ 45.273373][ T482] ? netdev_master_upper_dev_get (net/core/dev.c:7230)
[ 45.273569][ T482] vrf_device_event (drivers/net/vrf.c:1110 drivers/net/vrf.c:1119 drivers/net/vrf.c:1804) vrf
[ 45.273718][ T482] notifier_call_chain (kernel/notifier.c:85 (discriminator 2))
[ 45.273868][ T482] blocking_notifier_call_chain (kernel/notifier.c:381 kernel/notifier.c:368)
[ 45.274030][ T482] unregister_netdevice_many_notify (net/core/dev.c:11575)
[ 45.274215][ T482] ? __lock_release (kernel/locking/lockdep.c:5525)
[ 45.274368][ T482] ? __pfx___lock_release (kernel/locking/lockdep.c:5501)
[ 45.274525][ T482] ? __pfx_unregister_netdevice_many_notify (net/core/dev.c:11516)
[ 45.274706][ T482] ? 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)
[ 45.274862][ T482] ? mark_held_locks (kernel/locking/lockdep.c:4321)
[ 45.275012][ T482] ? __pfx_vlan_info_rcu_free (net/8021q/vlan_core.c:145)
[ 45.275163][ T482] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4347 kernel/locking/lockdep.c:4406)
[ 45.275359][ T482] rtnl_dellink (net/core/rtnetlink.c:3487 net/core/rtnetlink.c:3527)
[ 45.275521][ T482] ? __pfx_rtnl_dellink (net/core/rtnetlink.c:3493)
[ 45.275688][ T482] ? find_held_lock (kernel/locking/lockdep.c:5339)
[ 45.275838][ T482] ? __lock_release (kernel/locking/lockdep.c:5525)
[ 45.275994][ T482] ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/core/rtnetlink.c:6909)
[ 45.276140][ T482] ? __pfx___lock_release (kernel/locking/lockdep.c:5501)
[ 45.276291][ T482] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814)
[ 45.276440][ T482] ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/core/rtnetlink.c:6909)
[ 45.276587][ T482] ? __pfx_rtnl_dellink (net/core/rtnetlink.c:3493)
[ 45.276738][ T482] rtnetlink_rcv_msg (net/core/rtnetlink.c:6911)
[ 45.276886][ T482] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6814)
[ 45.277034][ T482] ? 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)
[ 45.277192][ T482] ? mark_lock (kernel/locking/lockdep.c:4727 (discriminator 3))
[ 45.277303][ T482] ? __lock_acquire (kernel/locking/lockdep.c:5226)
[ 45.277456][ T482] netlink_rcv_skb (net/netlink/af_netlink.c:2543)
[ 45.277606][ T482] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6814)
[ 45.277752][ T482] ? __pfx_netlink_rcv_skb (net/netlink/af_netlink.c:2520)
[ 45.277921][ T482] ? netlink_deliver_tap (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/netlink/af_netlink.c:340)
[ 45.278072][ T482] ? 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)
[ 45.278221][ T482] netlink_unicast (net/netlink/af_netlink.c:1322 net/netlink/af_netlink.c:1348)
[ 45.278414][ T482] ? __pfx_netlink_unicast (net/netlink/af_netlink.c:1333)
[ 45.278647][ T482] ? find_held_lock (kernel/locking/lockdep.c:5339)
[ 45.278891][ T482] netlink_sendmsg (net/netlink/af_netlink.c:1892)
[ 45.279131][ T482] ? __pfx_netlink_sendmsg (net/netlink/af_netlink.c:1811)
[ 45.279365][ T482] ____sys_sendmsg (net/socket.c:711 net/socket.c:726 net/socket.c:2594)
[ 45.279610][ T482] ? __pfx_____sys_sendmsg (net/socket.c:2540)
[ 45.279847][ T482] ? __pfx_copy_msghdr_from_user (net/socket.c:2520)
[ 45.280161][ T482] ___sys_sendmsg (net/socket.c:2650)
[ 45.280395][ T482] ? __pfx____sys_sendmsg (net/socket.c:2637)
[ 45.280631][ T482] ? kasan_save_stack (mm/kasan/common.c:49)
[ 45.280854][ T482] ? kasan_save_stack (mm/kasan/common.c:48)
[ 45.281061][ T482] ? __kasan_record_aux_stack (mm/kasan/generic.c:544)
[ 45.281261][ T482] ? __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)
[ 45.281555][ T482] ? __x64_sys_close (fs/open.c:1557 fs/open.c:1539 fs/open.c:1539)
[ 45.281768][ T482] ? do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83)
[ 45.282010][ T482] ? entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[ 45.282307][ T482] ? __lock_acquire (kernel/locking/lockdep.c:5226)
[ 45.282556][ T482] ? find_held_lock (kernel/locking/lockdep.c:5339)
[ 45.282813][ T482] ? __lock_release (kernel/locking/lockdep.c:5525)
[ 45.283051][ T482] ? __virt_addr_valid (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:962 ./include/linux/mmzone.h:2058 arch/x86/mm/physaddr.c:65)
[ 45.283299][ T482] ? __pfx___lock_release (kernel/locking/lockdep.c:5501)
[ 45.283536][ T482] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814)
[ 45.283779][ T482] __sys_sendmsg (net/socket.c:2680)
[ 45.284019][ T482] ? __pfx___sys_sendmsg (net/socket.c:2665)
[ 45.284265][ T482] ? __pfx_slab_free_after_rcu_debug (mm/slub.c:4643)
[ 45.284576][ T482] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83)
[ 45.284810][ T482] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[ 45.285133][ T482] RIP: 0033:0x7f1bb2e5b9a7
[ 45.285383][ T482] 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)
[ 45.286150][ T482] RSP: 002b:00007ffc41de44d8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[ 45.286517][ T482] RAX: ffffffffffffffda RBX: 00007ffc41de4c00 RCX: 00007f1bb2e5b9a7
[ 45.286838][ T482] RDX: 0000000000000000 RSI: 00007ffc41de4540 RDI: 0000000000000005
[ 45.287186][ T482] RBP: 0000000000000002 R08: 0000000000000003 R09: 0000000000000078
[ 45.287546][ T482] R10: 00007f1bb2d19ef8 R11: 0000000000000246 R12: 0000000000000002
Finger prints:
print_deadlock_bug:validate_chain:__lock_acquire:down_read:blocking_notifier_call_chain