====================================== | [ 43.437089][ T633] #0: ffffffffb0de7a48 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_dellink (net/core/rtnetlink.c:3521) | [ 43.437357][ T633] #1: ffffffffb0dd6630 ((netdev_chain).rwsem){++++}-{4:4}, at: blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368) | [ 43.437671][ T633] | [ 43.437671][ T633] stack backtrace: [ 43.438076][ T633] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 43.438261][ T633] Call Trace: [ 43.438373][ T633] [ 43.438451][ T633] dump_stack_lvl (lib/dump_stack.c:123) [ 43.438604][ T633] print_deadlock_bug (kernel/locking/lockdep.c:3040) [ 43.438769][ T633] validate_chain (kernel/locking/lockdep.c:3894) [ 43.438920][ T633] ? __pfx_validate_chain (kernel/locking/lockdep.c:3860) [ 43.439091][ T633] ? 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) [ 43.439247][ T633] ? mark_lock (kernel/locking/lockdep.c:4727 (discriminator 3)) [ 43.439363][ T633] __lock_acquire (kernel/locking/lockdep.c:5226) [ 43.439514][ T633] lock_acquire.part.0 (kernel/locking/lockdep.c:467 kernel/locking/lockdep.c:5851) [ 43.439659][ T633] ? blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368) [ 43.439852][ T633] ? netconsole_process_cleanups_core (drivers/net/netconsole.c:242 (discriminator 11)) [ 43.440046][ T633] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814) [ 43.440193][ T633] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 37)) [ 43.440348][ T633] ? lock_acquire (kernel/locking/lockdep.c:5822) [ 43.440496][ T633] ? blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368) [ 43.440694][ T633] down_read (./arch/x86/include/asm/preempt.h:79 kernel/locking/rwsem.c:1246 kernel/locking/rwsem.c:1261 kernel/locking/rwsem.c:1526) [ 43.440807][ T633] ? blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368) [ 43.440995][ T633] ? __pfx_down_read (kernel/locking/rwsem.c:1522) [ 43.441162][ T633] ? __lock_release (kernel/locking/lockdep.c:5525) [ 43.441321][ T633] ? netconsole_netdev_event (drivers/net/netconsole.c:1082) [ 43.441468][ T633] ? __pfx___lock_release (kernel/locking/lockdep.c:5501) [ 43.441614][ T633] blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368) [ 43.441776][ T633] __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)) [ 43.441923][ T633] ? __pfx___netdev_upper_dev_unlink (net/core/dev.c:8151) [ 43.442109][ T633] ? __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) [ 43.442266][ T633] ? __pfx___mutex_unlock_slowpath (kernel/locking/mutex.c:890) [ 43.442467][ T633] ? rtnl_is_locked (net/core/rtnetlink.c:163) [ 43.442616][ T633] netdev_upper_dev_unlink (net/core/dev.c:8190) [ 43.442764][ T633] ? __pfx_netdev_upper_dev_unlink (net/core/dev.c:8190) [ 43.442967][ T633] ? netconsole_netdev_event (drivers/net/netconsole.c:1082) [ 43.443115][ T633] ? 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) [ 43.443264][ T633] ? rtnl_is_locked (net/core/rtnetlink.c:163) [ 43.443416][ T633] ? netdev_master_upper_dev_get (net/core/dev.c:7230) [ 43.443604][ T633] vrf_device_event (drivers/net/vrf.c:1110 drivers/net/vrf.c:1119 drivers/net/vrf.c:1804) vrf [ 43.443764][ T633] notifier_call_chain (kernel/notifier.c:85 (discriminator 2)) [ 43.443914][ T633] blocking_notifier_call_chain (kernel/notifier.c:381 kernel/notifier.c:368) [ 43.444068][ T633] unregister_netdevice_many_notify (net/core/dev.c:11575) [ 43.444263][ T633] ? __lock_release (kernel/locking/lockdep.c:5525) [ 43.444411][ T633] ? __pfx___lock_release (kernel/locking/lockdep.c:5501) [ 43.444567][ T633] ? __pfx_unregister_netdevice_many_notify (net/core/dev.c:11516) [ 43.444759][ T633] ? 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) [ 43.444933][ T633] ? mark_held_locks (kernel/locking/lockdep.c:4321) [ 43.445092][ T633] ? __pfx_vlan_info_rcu_free (net/8021q/vlan_core.c:145) [ 43.445240][ T633] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4347 kernel/locking/lockdep.c:4406) [ 43.445425][ T633] rtnl_dellink (net/core/rtnetlink.c:3487 net/core/rtnetlink.c:3527) [ 43.445574][ T633] ? __pfx_rtnl_dellink (net/core/rtnetlink.c:3493) [ 43.445748][ T633] ? find_held_lock (kernel/locking/lockdep.c:5339) [ 43.445905][ T633] ? __lock_release (kernel/locking/lockdep.c:5525) [ 43.446067][ T633] ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/core/rtnetlink.c:6909) [ 43.446217][ T633] ? __pfx___lock_release (kernel/locking/lockdep.c:5501) [ 43.446374][ T633] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814) [ 43.446524][ T633] ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/core/rtnetlink.c:6909) [ 43.446671][ T633] ? __pfx_rtnl_dellink (net/core/rtnetlink.c:3493) [ 43.446828][ T633] rtnetlink_rcv_msg (net/core/rtnetlink.c:6911) [ 43.446978][ T633] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6814) [ 43.447123][ T633] ? 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) [ 43.447287][ T633] ? mark_lock (kernel/locking/lockdep.c:4727 (discriminator 3)) [ 43.447400][ T633] ? __lock_acquire (kernel/locking/lockdep.c:5226) [ 43.447546][ T633] netlink_rcv_skb (net/netlink/af_netlink.c:2543) [ 43.447691][ T633] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6814) [ 43.447846][ T633] ? __pfx_netlink_rcv_skb (net/netlink/af_netlink.c:2520) [ 43.448022][ T633] ? netlink_deliver_tap (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/netlink/af_netlink.c:340) [ 43.448185][ T633] ? 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) [ 43.448336][ T633] netlink_unicast (net/netlink/af_netlink.c:1322 net/netlink/af_netlink.c:1348) [ 43.448484][ T633] ? __pfx_netlink_unicast (net/netlink/af_netlink.c:1333) [ 43.448631][ T633] ? find_held_lock (kernel/locking/lockdep.c:5339) [ 43.448779][ T633] netlink_sendmsg (net/netlink/af_netlink.c:1892) [ 43.448925][ T633] ? __pfx_netlink_sendmsg (net/netlink/af_netlink.c:1811) [ 43.449083][ T633] ____sys_sendmsg (net/socket.c:711 net/socket.c:726 net/socket.c:2594) [ 43.449246][ T633] ? __pfx_____sys_sendmsg (net/socket.c:2540) [ 43.449396][ T633] ? __pfx_copy_msghdr_from_user (net/socket.c:2520) [ 43.449587][ T633] ___sys_sendmsg (net/socket.c:2650) [ 43.449736][ T633] ? __pfx____sys_sendmsg (net/socket.c:2637) [ 43.449883][ T633] ? kasan_save_stack (mm/kasan/common.c:49) [ 43.450033][ T633] ? kasan_save_stack (mm/kasan/common.c:48) [ 43.450177][ T633] ? __kasan_record_aux_stack (mm/kasan/generic.c:544) [ 43.450323][ T633] ? __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) [ 43.450504][ T633] ? __x64_sys_close (fs/open.c:1557 fs/open.c:1539 fs/open.c:1539) [ 43.450653][ T633] ? do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) [ 43.450798][ T633] ? entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) [ 43.450981][ T633] ? __lock_acquire (kernel/locking/lockdep.c:5226) [ 43.451130][ T633] ? find_held_lock (kernel/locking/lockdep.c:5339) [ 43.451279][ T633] ? __lock_release (kernel/locking/lockdep.c:5525) [ 43.451426][ T633] ? __virt_addr_valid (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:962 ./include/linux/mmzone.h:2058 arch/x86/mm/physaddr.c:65) [ 43.451588][ T633] ? __pfx___lock_release (kernel/locking/lockdep.c:5501) [ 43.451740][ T633] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814) [ 43.451905][ T633] __sys_sendmsg (net/socket.c:2680) [ 43.452057][ T633] ? __pfx___sys_sendmsg (net/socket.c:2665) [ 43.452205][ T633] ? __pfx_slab_free_after_rcu_debug (mm/slub.c:4643) [ 43.452393][ T633] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) [ 43.452538][ T633] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) [ 43.452720][ T633] RIP: 0033:0x7f089212c9a7 [ 43.452876][ T633] 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) [ 43.453391][ T633] RSP: 002b:00007ffe44ba6218 EFLAGS: 00000246 ORIG_RAX: 000000000000002e [ 43.453612][ T633] RAX: ffffffffffffffda RBX: 00007ffe44ba6940 RCX: 00007f089212c9a7 [ 43.453838][ T633] RDX: 0000000000000000 RSI: 00007ffe44ba6280 RDI: 0000000000000005 [ 43.454061][ T633] RBP: 0000000000000002 R08: 0000000000000003 R09: 0000000000000078 [ 43.454279][ T633] R10: 00007f0891feaef8 R11: 0000000000000246 R12: 0000000000000002 Finger prints: print_deadlock_bug:validate_chain:__lock_acquire:down_read:blocking_notifier_call_chain