======================================
| [ 221.553432][ T2332] #0: ffffffffb61e7a48 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_dellink (net/core/rtnetlink.c:3521)
| [ 221.553702][ T2332] #1: ffffffffb61d6630 ((netdev_chain).rwsem){++++}-{4:4}, at: blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368)
| [ 221.553989][ T2332]
| [ 221.553989][ T2332] stack backtrace:
[ 221.554392][ T2332] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 221.554576][ T2332] Call Trace:
[ 221.554687][ T2332] <TASK>
[ 221.554765][ T2332] dump_stack_lvl (lib/dump_stack.c:123)
[ 221.554917][ T2332] print_deadlock_bug (kernel/locking/lockdep.c:3040)
[ 221.555063][ T2332] validate_chain (kernel/locking/lockdep.c:3894)
[ 221.555209][ T2332] ? __pfx_validate_chain (kernel/locking/lockdep.c:3860)
[ 221.555365][ T2332] ? 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)
[ 221.555519][ T2332] ? mark_lock (kernel/locking/lockdep.c:4727 (discriminator 3))
[ 221.555634][ T2332] __lock_acquire (kernel/locking/lockdep.c:5226)
[ 221.555780][ T2332] lock_acquire.part.0 (kernel/locking/lockdep.c:467 kernel/locking/lockdep.c:5851)
[ 221.555926][ T2332] ? blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368)
[ 221.556117][ T2332] ? netconsole_process_cleanups_core (drivers/net/netconsole.c:242 (discriminator 11))
[ 221.556315][ T2332] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814)
[ 221.556461][ T2332] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 37))
[ 221.556612][ T2332] ? lock_acquire (kernel/locking/lockdep.c:5822)
[ 221.556759][ T2332] ? blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368)
[ 221.556948][ T2332] down_read (./arch/x86/include/asm/preempt.h:79 kernel/locking/rwsem.c:1246 kernel/locking/rwsem.c:1261 kernel/locking/rwsem.c:1526)
[ 221.557066][ T2332] ? blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368)
[ 221.557250][ T2332] ? __pfx_down_read (kernel/locking/rwsem.c:1522)
[ 221.557414][ T2332] ? __lock_release (kernel/locking/lockdep.c:5525)
[ 221.557570][ T2332] ? netconsole_netdev_event (drivers/net/netconsole.c:1082)
[ 221.557730][ T2332] ? __pfx___lock_release (kernel/locking/lockdep.c:5501)
[ 221.557893][ T2332] blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368)
[ 221.558128][ T2332] __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))
[ 221.558302][ T2332] ? __pfx___netdev_upper_dev_unlink (net/core/dev.c:8151)
[ 221.558491][ T2332] ? __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)
[ 221.558646][ T2332] ? __pfx___mutex_unlock_slowpath (kernel/locking/mutex.c:890)
[ 221.558855][ T2332] ? rtnl_is_locked (net/core/rtnetlink.c:163)
[ 221.559019][ T2332] netdev_upper_dev_unlink (net/core/dev.c:8190)
[ 221.559182][ T2332] ? __pfx_netdev_upper_dev_unlink (net/core/dev.c:8190)
[ 221.559374][ T2332] ? netconsole_netdev_event (drivers/net/netconsole.c:1082)
[ 221.559540][ T2332] ? 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)
[ 221.559700][ T2332] ? rtnl_is_locked (net/core/rtnetlink.c:163)
[ 221.559856][ T2332] ? netdev_master_upper_dev_get (net/core/dev.c:7230)
[ 221.560052][ T2332] vrf_device_event (drivers/net/vrf.c:1110 drivers/net/vrf.c:1119 drivers/net/vrf.c:1804) vrf
[ 221.560209][ T2332] notifier_call_chain (kernel/notifier.c:85 (discriminator 2))
[ 221.560387][ T2332] blocking_notifier_call_chain (kernel/notifier.c:381 kernel/notifier.c:368)
[ 221.560547][ T2332] unregister_netdevice_many_notify (net/core/dev.c:11575)
[ 221.560767][ T2332] ? __pfx_unregister_netdevice_many_notify (net/core/dev.c:11516)
[ 221.560963][ T2332] ? rtnl_dellink (net/core/rtnetlink.c:3521)
[ 221.561122][ T2332] ? sock_def_readable (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/core/sock.c:3479)
[ 221.561290][ T2332] ? __pfx___mutex_lock (kernel/locking/mutex.c:734)
[ 221.561455][ T2332] ? rtnl_is_locked (net/core/rtnetlink.c:163)
[ 221.561615][ T2332] ? unregister_netdevice_queue (net/core/dev.c:11501)
[ 221.561813][ T2332] ? __pfx_unregister_netdevice_queue (net/core/dev.c:11500)
[ 221.562005][ T2332] ? __nla_validate_parse (./include/net/netlink.h:1270 (discriminator 1) lib/nlattr.c:622 (discriminator 1))
[ 221.562169][ T2332] rtnl_dellink (net/core/rtnetlink.c:3487 net/core/rtnetlink.c:3527)
[ 221.562340][ T2332] ? __pfx_rtnl_dellink (net/core/rtnetlink.c:3493)
[ 221.562522][ T2332] ? find_held_lock (kernel/locking/lockdep.c:5339)
[ 221.562683][ T2332] ? __lock_release (kernel/locking/lockdep.c:5525)
[ 221.562846][ T2332] ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/core/rtnetlink.c:6909)
[ 221.563011][ T2332] ? __pfx___lock_release (kernel/locking/lockdep.c:5501)
[ 221.563168][ T2332] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814)
[ 221.563330][ T2332] ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/core/rtnetlink.c:6909)
[ 221.563496][ T2332] ? __pfx_rtnl_dellink (net/core/rtnetlink.c:3493)
[ 221.563656][ T2332] rtnetlink_rcv_msg (net/core/rtnetlink.c:6911)
[ 221.563811][ T2332] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6814)
[ 221.563974][ T2332] ? 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)
[ 221.564144][ T2332] ? mark_lock (kernel/locking/lockdep.c:4727 (discriminator 3))
[ 221.564266][ T2332] ? __lock_acquire (kernel/locking/lockdep.c:5226)
[ 221.564424][ T2332] netlink_rcv_skb (net/netlink/af_netlink.c:2543)
[ 221.564583][ T2332] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6814)
[ 221.564753][ T2332] ? __pfx_netlink_rcv_skb (net/netlink/af_netlink.c:2520)
[ 221.564921][ T2332] ? netlink_deliver_tap (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/netlink/af_netlink.c:340)
[ 221.565087][ T2332] ? 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)
[ 221.565251][ T2332] netlink_unicast (net/netlink/af_netlink.c:1322 net/netlink/af_netlink.c:1348)
[ 221.565407][ T2332] ? __pfx_netlink_unicast (net/netlink/af_netlink.c:1333)
[ 221.565553][ T2332] ? find_held_lock (kernel/locking/lockdep.c:5339)
[ 221.565720][ T2332] netlink_sendmsg (net/netlink/af_netlink.c:1892)
[ 221.565877][ T2332] ? __pfx_netlink_sendmsg (net/netlink/af_netlink.c:1811)
[ 221.566036][ T2332] ____sys_sendmsg (net/socket.c:711 net/socket.c:726 net/socket.c:2594)
[ 221.566204][ T2332] ? __pfx_____sys_sendmsg (net/socket.c:2540)
[ 221.566361][ T2332] ? __pfx_copy_msghdr_from_user (net/socket.c:2520)
[ 221.566560][ T2332] ___sys_sendmsg (net/socket.c:2650)
[ 221.566716][ T2332] ? __pfx____sys_sendmsg (net/socket.c:2637)
[ 221.566880][ T2332] ? kasan_save_stack (mm/kasan/common.c:49)
[ 221.567047][ T2332] ? kasan_save_stack (mm/kasan/common.c:48)
[ 221.567197][ T2332] ? __kasan_record_aux_stack (mm/kasan/generic.c:544)
[ 221.567349][ T2332] ? __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)
[ 221.567542][ T2332] ? __x64_sys_close (fs/open.c:1557 fs/open.c:1539 fs/open.c:1539)
[ 221.567688][ T2332] ? do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83)
[ 221.567834][ T2332] ? entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[ 221.568029][ T2332] ? __lock_acquire (kernel/locking/lockdep.c:5226)
[ 221.568178][ T2332] ? find_held_lock (kernel/locking/lockdep.c:5339)
[ 221.568332][ T2332] ? __lock_release (kernel/locking/lockdep.c:5525)
[ 221.568475][ T2332] ? __virt_addr_valid (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:962 ./include/linux/mmzone.h:2058 arch/x86/mm/physaddr.c:65)
[ 221.568632][ T2332] ? __pfx___lock_release (kernel/locking/lockdep.c:5501)
[ 221.568792][ T2332] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814)
[ 221.568952][ T2332] __sys_sendmsg (net/socket.c:2680)
[ 221.569145][ T2332] ? __pfx___sys_sendmsg (net/socket.c:2665)
[ 221.569294][ T2332] ? __pfx_slab_free_after_rcu_debug (mm/slub.c:4643)
[ 221.569492][ T2332] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83)
[ 221.569645][ T2332] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[ 221.569842][ T2332] RIP: 0033:0x7f8040ccc9a7
[ 221.569997][ T2332] 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)
[ 221.570528][ T2332] RSP: 002b:00007ffd41a0e188 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[ 221.570754][ T2332] RAX: ffffffffffffffda RBX: 00007ffd41a0e8b0 RCX: 00007f8040ccc9a7
[ 221.571007][ T2332] RDX: 0000000000000000 RSI: 00007ffd41a0e1f0 RDI: 0000000000000005
[ 221.571258][ T2332] RBP: 0000000000000002 R08: 0000000000000003 R09: 0000000000000078
[ 221.571492][ T2332] R10: 00007f8040b8aef8 R11: 0000000000000246 R12: 0000000000000002
Finger prints:
print_deadlock_bug:validate_chain:__lock_acquire:down_read:blocking_notifier_call_chain