======================================
| [ 40.655538][ T487] #0: ffffffffb21e7a48 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_dellink (net/core/rtnetlink.c:3521)
| [ 40.655803][ T487] #1: ffffffffb21d6630 ((netdev_chain).rwsem){++++}-{4:4}, at: blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368)
| [ 40.656101][ T487]
| [ 40.656101][ T487] stack backtrace:
[ 40.656498][ T487] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 40.656679][ T487] Call Trace:
[ 40.656795][ T487] <TASK>
[ 40.656873][ T487] dump_stack_lvl (lib/dump_stack.c:123)
[ 40.657029][ T487] print_deadlock_bug (kernel/locking/lockdep.c:3040)
[ 40.657176][ T487] validate_chain (kernel/locking/lockdep.c:3894)
[ 40.657325][ T487] ? __pfx_validate_chain (kernel/locking/lockdep.c:3860)
[ 40.657474][ T487] ? 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)
[ 40.657619][ T487] ? mark_lock (kernel/locking/lockdep.c:4727 (discriminator 3))
[ 40.657731][ T487] __lock_acquire (kernel/locking/lockdep.c:5226)
[ 40.657881][ T487] lock_acquire.part.0 (kernel/locking/lockdep.c:467 kernel/locking/lockdep.c:5851)
[ 40.658027][ T487] ? blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368)
[ 40.658219][ T487] ? netconsole_process_cleanups_core (drivers/net/netconsole.c:242 (discriminator 11))
[ 40.658405][ T487] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814)
[ 40.658552][ T487] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 37))
[ 40.658699][ T487] ? lock_acquire (kernel/locking/lockdep.c:5822)
[ 40.658846][ T487] ? blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368)
[ 40.659028][ T487] down_read (./arch/x86/include/asm/preempt.h:79 kernel/locking/rwsem.c:1246 kernel/locking/rwsem.c:1261 kernel/locking/rwsem.c:1526)
[ 40.659148][ T487] ? blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368)
[ 40.659340][ T487] ? __pfx_down_read (kernel/locking/rwsem.c:1522)
[ 40.659487][ T487] ? __lock_release (kernel/locking/lockdep.c:5525)
[ 40.659633][ T487] ? netconsole_netdev_event (drivers/net/netconsole.c:1082)
[ 40.659781][ T487] ? __pfx___lock_release (kernel/locking/lockdep.c:5501)
[ 40.659931][ T487] blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368)
[ 40.660079][ T487] __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))
[ 40.660233][ T487] ? __pfx___netdev_upper_dev_unlink (net/core/dev.c:8151)
[ 40.660417][ T487] ? __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)
[ 40.660564][ T487] ? __pfx___mutex_unlock_slowpath (kernel/locking/mutex.c:890)
[ 40.660746][ T487] ? rtnl_is_locked (net/core/rtnetlink.c:163)
[ 40.660895][ T487] netdev_upper_dev_unlink (net/core/dev.c:8190)
[ 40.661041][ T487] ? __pfx_netdev_upper_dev_unlink (net/core/dev.c:8190)
[ 40.661224][ T487] ? netconsole_netdev_event (drivers/net/netconsole.c:1082)
[ 40.661379][ T487] ? 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)
[ 40.661527][ T487] ? rtnl_is_locked (net/core/rtnetlink.c:163)
[ 40.661675][ T487] ? netdev_master_upper_dev_get (net/core/dev.c:7230)
[ 40.661856][ T487] vrf_device_event (drivers/net/vrf.c:1110 drivers/net/vrf.c:1119 drivers/net/vrf.c:1804) vrf
[ 40.662005][ T487] notifier_call_chain (kernel/notifier.c:85 (discriminator 2))
[ 40.662156][ T487] blocking_notifier_call_chain (kernel/notifier.c:381 kernel/notifier.c:368)
[ 40.662304][ T487] unregister_netdevice_many_notify (net/core/dev.c:11575)
[ 40.662492][ T487] ? __pfx_unregister_netdevice_many_notify (net/core/dev.c:11516)
[ 40.662674][ T487] ? rtnl_dellink (net/core/rtnetlink.c:3521)
[ 40.662822][ T487] ? sock_def_readable (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/core/sock.c:3479)
[ 40.662970][ T487] ? __pfx___mutex_lock (kernel/locking/mutex.c:734)
[ 40.663115][ T487] ? rtnl_is_locked (net/core/rtnetlink.c:163)
[ 40.663260][ T487] ? unregister_netdevice_queue (net/core/dev.c:11501)
[ 40.663444][ T487] ? __pfx_unregister_netdevice_queue (net/core/dev.c:11500)
[ 40.663628][ T487] ? __nla_validate_parse (./include/net/netlink.h:1270 (discriminator 1) lib/nlattr.c:622 (discriminator 1))
[ 40.663778][ T487] rtnl_dellink (net/core/rtnetlink.c:3487 net/core/rtnetlink.c:3527)
[ 40.663927][ T487] ? __pfx_rtnl_dellink (net/core/rtnetlink.c:3493)
[ 40.664089][ T487] ? find_held_lock (kernel/locking/lockdep.c:5339)
[ 40.664238][ T487] ? __lock_release (kernel/locking/lockdep.c:5525)
[ 40.664384][ T487] ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/core/rtnetlink.c:6909)
[ 40.664533][ T487] ? __pfx___lock_release (kernel/locking/lockdep.c:5501)
[ 40.664685][ T487] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814)
[ 40.664832][ T487] ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/core/rtnetlink.c:6909)
[ 40.664980][ T487] ? __pfx_rtnl_dellink (net/core/rtnetlink.c:3493)
[ 40.665130][ T487] rtnetlink_rcv_msg (net/core/rtnetlink.c:6911)
[ 40.665280][ T487] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6814)
[ 40.665426][ T487] ? 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)
[ 40.665574][ T487] ? mark_lock (kernel/locking/lockdep.c:4727 (discriminator 3))
[ 40.665692][ T487] ? __lock_acquire (kernel/locking/lockdep.c:5226)
[ 40.665842][ T487] netlink_rcv_skb (net/netlink/af_netlink.c:2543)
[ 40.665990][ T487] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6814)
[ 40.666138][ T487] ? __pfx_netlink_rcv_skb (net/netlink/af_netlink.c:2520)
[ 40.666288][ T487] ? netlink_deliver_tap (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/netlink/af_netlink.c:340)
[ 40.666437][ T487] ? 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)
[ 40.666584][ T487] netlink_unicast (net/netlink/af_netlink.c:1322 net/netlink/af_netlink.c:1348)
[ 40.666734][ T487] ? __pfx_netlink_unicast (net/netlink/af_netlink.c:1333)
[ 40.666880][ T487] ? find_held_lock (kernel/locking/lockdep.c:5339)
[ 40.667029][ T487] netlink_sendmsg (net/netlink/af_netlink.c:1892)
[ 40.667176][ T487] ? __pfx_netlink_sendmsg (net/netlink/af_netlink.c:1811)
[ 40.667324][ T487] ____sys_sendmsg (net/socket.c:711 net/socket.c:726 net/socket.c:2594)
[ 40.667472][ T487] ? __pfx_____sys_sendmsg (net/socket.c:2540)
[ 40.667619][ T487] ? __pfx_copy_msghdr_from_user (net/socket.c:2520)
[ 40.667811][ T487] ___sys_sendmsg (net/socket.c:2650)
[ 40.667956][ T487] ? __pfx____sys_sendmsg (net/socket.c:2637)
[ 40.668104][ T487] ? kasan_save_stack (mm/kasan/common.c:49)
[ 40.668254][ T487] ? kasan_save_stack (mm/kasan/common.c:48)
[ 40.668400][ T487] ? __kasan_record_aux_stack (mm/kasan/generic.c:544)
[ 40.668547][ T487] ? __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)
[ 40.668733][ T487] ? __x64_sys_close (fs/open.c:1557 fs/open.c:1539 fs/open.c:1539)
[ 40.668886][ T487] ? do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83)
[ 40.669042][ T487] ? entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[ 40.669234][ T487] ? __lock_acquire (kernel/locking/lockdep.c:5226)
[ 40.669384][ T487] ? find_held_lock (kernel/locking/lockdep.c:5339)
[ 40.669532][ T487] ? __lock_release (kernel/locking/lockdep.c:5525)
[ 40.669676][ T487] ? __virt_addr_valid (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:962 ./include/linux/mmzone.h:2058 arch/x86/mm/physaddr.c:65)
[ 40.669825][ T487] ? __pfx___lock_release (kernel/locking/lockdep.c:5501)
[ 40.669971][ T487] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814)
[ 40.670123][ T487] __sys_sendmsg (net/socket.c:2680)
[ 40.670269][ T487] ? __pfx___sys_sendmsg (net/socket.c:2665)
[ 40.670415][ T487] ? __pfx_slab_free_after_rcu_debug (mm/slub.c:4643)
[ 40.670604][ T487] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83)
[ 40.670749][ T487] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[ 40.670929][ T487] RIP: 0033:0x7f4e06a8d9a7
[ 40.671086][ T487] 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)
[ 40.671601][ T487] RSP: 002b:00007fff90114fb8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[ 40.671824][ T487] RAX: ffffffffffffffda RBX: 00007fff901156e0 RCX: 00007f4e06a8d9a7
[ 40.672048][ T487] RDX: 0000000000000000 RSI: 00007fff90115020 RDI: 0000000000000005
[ 40.672271][ T487] RBP: 0000000000000002 R08: 0000000000000003 R09: 0000000000000078
[ 40.672492][ T487] R10: 00007f4e0694bef8 R11: 0000000000000246 R12: 0000000000000002
Finger prints:
print_deadlock_bug:validate_chain:__lock_acquire:down_read:blocking_notifier_call_chain