======================================
| [ 34.780458][ T468] #0: ffffffffb61e7a48 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_dellink (net/core/rtnetlink.c:3521)
| [ 34.780907][ T468] #1: ffffffffb61d6630 ((netdev_chain).rwsem){++++}-{4:4}, at: blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368)
| [ 34.781299][ T468]
| [ 34.781299][ T468] stack backtrace:
[ 34.781750][ T468] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 34.781969][ T468] Call Trace:
[ 34.782094][ T468] <TASK>
[ 34.782179][ T468] dump_stack_lvl (lib/dump_stack.c:123)
[ 34.782348][ T468] print_deadlock_bug (kernel/locking/lockdep.c:3040)
[ 34.782513][ T468] validate_chain (kernel/locking/lockdep.c:3894)
[ 34.782679][ T468] ? __pfx_validate_chain (kernel/locking/lockdep.c:3860)
[ 34.782850][ T468] ? 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)
[ 34.783027][ T468] ? mark_lock (kernel/locking/lockdep.c:4727 (discriminator 3))
[ 34.783154][ T468] __lock_acquire (kernel/locking/lockdep.c:5226)
[ 34.783323][ T468] lock_acquire.part.0 (kernel/locking/lockdep.c:467 kernel/locking/lockdep.c:5851)
[ 34.783473][ T468] ? blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368)
[ 34.783661][ T468] ? netconsole_process_cleanups_core (drivers/net/netconsole.c:242 (discriminator 11))
[ 34.783852][ T468] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814)
[ 34.784020][ T468] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 37))
[ 34.784174][ T468] ? lock_acquire (kernel/locking/lockdep.c:5822)
[ 34.784323][ T468] ? blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368)
[ 34.784512][ T468] down_read (./arch/x86/include/asm/preempt.h:79 kernel/locking/rwsem.c:1246 kernel/locking/rwsem.c:1261 kernel/locking/rwsem.c:1526)
[ 34.784627][ T468] ? blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368)
[ 34.784815][ T468] ? __pfx_down_read (kernel/locking/rwsem.c:1522)
[ 34.784973][ T468] ? __lock_release (kernel/locking/lockdep.c:5525)
[ 34.785127][ T468] ? netconsole_netdev_event (drivers/net/netconsole.c:1082)
[ 34.785285][ T468] ? __pfx___lock_release (kernel/locking/lockdep.c:5501)
[ 34.785437][ T468] blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368)
[ 34.785590][ T468] __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))
[ 34.785744][ T468] ? __pfx___netdev_upper_dev_unlink (net/core/dev.c:8151)
[ 34.785939][ T468] ? __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)
[ 34.786091][ T468] ? __pfx___mutex_unlock_slowpath (kernel/locking/mutex.c:890)
[ 34.786283][ T468] ? rtnl_is_locked (net/core/rtnetlink.c:163)
[ 34.786438][ T468] netdev_upper_dev_unlink (net/core/dev.c:8190)
[ 34.786588][ T468] ? __pfx_netdev_upper_dev_unlink (net/core/dev.c:8190)
[ 34.786778][ T468] ? netconsole_netdev_event (drivers/net/netconsole.c:1082)
[ 34.786937][ T468] ? 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)
[ 34.787090][ T468] ? rtnl_is_locked (net/core/rtnetlink.c:163)
[ 34.787246][ T468] ? netdev_master_upper_dev_get (net/core/dev.c:7230)
[ 34.787434][ T468] vrf_device_event (drivers/net/vrf.c:1110 drivers/net/vrf.c:1119 drivers/net/vrf.c:1804) vrf
[ 34.787588][ T468] notifier_call_chain (kernel/notifier.c:85 (discriminator 2))
[ 34.787739][ T468] blocking_notifier_call_chain (kernel/notifier.c:381 kernel/notifier.c:368)
[ 34.787892][ T468] unregister_netdevice_many_notify (net/core/dev.c:11575)
[ 34.788103][ T468] ? __lock_release (kernel/locking/lockdep.c:5525)
[ 34.788266][ T468] ? __pfx___lock_release (kernel/locking/lockdep.c:5501)
[ 34.788434][ T468] ? __pfx_unregister_netdevice_many_notify (net/core/dev.c:11516)
[ 34.788637][ T468] ? 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)
[ 34.788804][ T468] ? mark_held_locks (kernel/locking/lockdep.c:4321)
[ 34.788976][ T468] ? __pfx_vlan_info_rcu_free (net/8021q/vlan_core.c:145)
[ 34.789141][ T468] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4347 kernel/locking/lockdep.c:4406)
[ 34.789330][ T468] rtnl_dellink (net/core/rtnetlink.c:3487 net/core/rtnetlink.c:3527)
[ 34.789481][ T468] ? __pfx_rtnl_dellink (net/core/rtnetlink.c:3493)
[ 34.789650][ T468] ? find_held_lock (kernel/locking/lockdep.c:5339)
[ 34.789801][ T468] ? __lock_release (kernel/locking/lockdep.c:5525)
[ 34.789975][ T468] ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/core/rtnetlink.c:6909)
[ 34.790161][ T468] ? __pfx___lock_release (kernel/locking/lockdep.c:5501)
[ 34.790314][ T468] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814)
[ 34.790467][ T468] ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/core/rtnetlink.c:6909)
[ 34.790618][ T468] ? __pfx_rtnl_dellink (net/core/rtnetlink.c:3493)
[ 34.790771][ T468] rtnetlink_rcv_msg (net/core/rtnetlink.c:6911)
[ 34.790931][ T468] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6814)
[ 34.791084][ T468] ? 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)
[ 34.791237][ T468] ? mark_lock (kernel/locking/lockdep.c:4727 (discriminator 3))
[ 34.791354][ T468] ? __lock_acquire (kernel/locking/lockdep.c:5226)
[ 34.791505][ T468] netlink_rcv_skb (net/netlink/af_netlink.c:2543)
[ 34.791655][ T468] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6814)
[ 34.791806][ T468] ? __pfx_netlink_rcv_skb (net/netlink/af_netlink.c:2520)
[ 34.791976][ T468] ? netlink_deliver_tap (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/netlink/af_netlink.c:340)
[ 34.792128][ T468] ? 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)
[ 34.792285][ T468] netlink_unicast (net/netlink/af_netlink.c:1322 net/netlink/af_netlink.c:1348)
[ 34.792435][ T468] ? __pfx_netlink_unicast (net/netlink/af_netlink.c:1333)
[ 34.792584][ T468] ? find_held_lock (kernel/locking/lockdep.c:5339)
[ 34.792737][ T468] netlink_sendmsg (net/netlink/af_netlink.c:1892)
[ 34.792887][ T468] ? __pfx_netlink_sendmsg (net/netlink/af_netlink.c:1811)
[ 34.793050][ T468] ____sys_sendmsg (net/socket.c:711 net/socket.c:726 net/socket.c:2594)
[ 34.793208][ T468] ? __pfx_____sys_sendmsg (net/socket.c:2540)
[ 34.793368][ T468] ? __pfx_copy_msghdr_from_user (net/socket.c:2520)
[ 34.793572][ T468] ___sys_sendmsg (net/socket.c:2650)
[ 34.793722][ T468] ? __pfx____sys_sendmsg (net/socket.c:2637)
[ 34.793872][ T468] ? kasan_save_stack (mm/kasan/common.c:49)
[ 34.794054][ T468] ? kasan_save_stack (mm/kasan/common.c:48)
[ 34.794212][ T468] ? __kasan_record_aux_stack (mm/kasan/generic.c:544)
[ 34.794364][ T468] ? __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)
[ 34.794551][ T468] ? __x64_sys_close (fs/open.c:1557 fs/open.c:1539 fs/open.c:1539)
[ 34.794705][ T468] ? do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83)
[ 34.794854][ T468] ? entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[ 34.795053][ T468] ? __lock_acquire (kernel/locking/lockdep.c:5226)
[ 34.795211][ T468] ? find_held_lock (kernel/locking/lockdep.c:5339)
[ 34.795365][ T468] ? __lock_release (kernel/locking/lockdep.c:5525)
[ 34.795514][ T468] ? __virt_addr_valid (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:962 ./include/linux/mmzone.h:2058 arch/x86/mm/physaddr.c:65)
[ 34.795667][ T468] ? __pfx___lock_release (kernel/locking/lockdep.c:5501)
[ 34.795816][ T468] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814)
[ 34.795977][ T468] __sys_sendmsg (net/socket.c:2680)
[ 34.796129][ T468] ? __pfx___sys_sendmsg (net/socket.c:2665)
[ 34.796284][ T468] ? __pfx_slab_free_after_rcu_debug (mm/slub.c:4643)
[ 34.796485][ T468] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83)
[ 34.796637][ T468] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[ 34.796822][ T468] RIP: 0033:0x7f12e98b29a7
[ 34.796996][ T468] 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)
[ 34.797526][ T468] RSP: 002b:00007ffc739455f8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[ 34.797762][ T468] RAX: ffffffffffffffda RBX: 00007ffc73945d20 RCX: 00007f12e98b29a7
[ 34.798000][ T468] RDX: 0000000000000000 RSI: 00007ffc73945660 RDI: 0000000000000005
[ 34.798250][ T468] RBP: 0000000000000002 R08: 0000000000000003 R09: 0000000000000078
[ 34.798480][ T468] R10: 00007f12e9770ef8 R11: 0000000000000246 R12: 0000000000000002
Finger prints:
print_deadlock_bug:validate_chain:__lock_acquire:down_read:blocking_notifier_call_chain