====================================== | [ 24.864295][ T376] #0: ffffffff8f1e7a48 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_dellink (net/core/rtnetlink.c:3521) | [ 24.864590][ T376] #1: ffffffff8f1d6630 ((netdev_chain).rwsem){++++}-{4:4}, at: blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368) | [ 24.864919][ T376] | [ 24.864919][ T376] stack backtrace: [ 24.865353][ T376] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 24.865555][ T376] Call Trace: [ 24.865683][ T376] [ 24.865769][ T376] dump_stack_lvl (lib/dump_stack.c:123) [ 24.865938][ T376] print_deadlock_bug (kernel/locking/lockdep.c:3040) [ 24.866101][ T376] validate_chain (kernel/locking/lockdep.c:3894) [ 24.866265][ T376] ? __pfx_validate_chain (kernel/locking/lockdep.c:3860) [ 24.866434][ T376] ? 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) [ 24.866592][ T376] ? mark_lock (kernel/locking/lockdep.c:4727 (discriminator 3)) [ 24.866719][ T376] __lock_acquire (kernel/locking/lockdep.c:5226) [ 24.866879][ T376] lock_acquire.part.0 (kernel/locking/lockdep.c:467 kernel/locking/lockdep.c:5851) [ 24.867037][ T376] ? blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368) [ 24.867234][ T376] ? netconsole_process_cleanups_core (drivers/net/netconsole.c:242 (discriminator 11)) [ 24.867440][ T376] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814) [ 24.867604][ T376] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 37)) [ 24.867764][ T376] ? lock_acquire (kernel/locking/lockdep.c:5822) [ 24.867931][ T376] ? blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368) [ 24.868130][ T376] down_read (./arch/x86/include/asm/preempt.h:79 kernel/locking/rwsem.c:1246 kernel/locking/rwsem.c:1261 kernel/locking/rwsem.c:1526) [ 24.868254][ T376] ? blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368) [ 24.868449][ T376] ? __pfx_down_read (kernel/locking/rwsem.c:1522) [ 24.868611][ T376] ? __lock_release (kernel/locking/lockdep.c:5525) [ 24.868772][ T376] ? netconsole_netdev_event (drivers/net/netconsole.c:1082) [ 24.868947][ T376] ? __pfx___lock_release (kernel/locking/lockdep.c:5501) [ 24.869115][ T376] blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368) [ 24.869284][ T376] __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)) [ 24.869445][ T376] ? __pfx___netdev_upper_dev_unlink (net/core/dev.c:8151) [ 24.869642][ T376] ? __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) [ 24.869806][ T376] ? __pfx___mutex_unlock_slowpath (kernel/locking/mutex.c:890) [ 24.870006][ T376] ? rtnl_is_locked (net/core/rtnetlink.c:163) [ 24.870174][ T376] netdev_upper_dev_unlink (net/core/dev.c:8190) [ 24.870335][ T376] ? __pfx_netdev_upper_dev_unlink (net/core/dev.c:8190) [ 24.870534][ T376] ? netconsole_netdev_event (drivers/net/netconsole.c:1082) [ 24.870695][ T376] ? 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) [ 24.870853][ T376] ? rtnl_is_locked (net/core/rtnetlink.c:163) [ 24.871014][ T376] ? netdev_master_upper_dev_get (net/core/dev.c:7230) [ 24.871212][ T376] vrf_device_event (drivers/net/vrf.c:1110 drivers/net/vrf.c:1119 drivers/net/vrf.c:1804) vrf [ 24.871380][ T376] notifier_call_chain (kernel/notifier.c:85 (discriminator 2)) [ 24.871540][ T376] blocking_notifier_call_chain (kernel/notifier.c:381 kernel/notifier.c:368) [ 24.871700][ T376] unregister_netdevice_many_notify (net/core/dev.c:11575) [ 24.871900][ T376] ? __lock_release (kernel/locking/lockdep.c:5525) [ 24.872059][ T376] ? __pfx___lock_release (kernel/locking/lockdep.c:5501) [ 24.872220][ T376] ? __pfx_unregister_netdevice_many_notify (net/core/dev.c:11516) [ 24.872423][ T376] ? 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) [ 24.872585][ T376] ? mark_held_locks (kernel/locking/lockdep.c:4321) [ 24.872742][ T376] ? __pfx_vlan_info_rcu_free (net/8021q/vlan_core.c:145) [ 24.872910][ T376] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4347 kernel/locking/lockdep.c:4406) [ 24.873112][ T376] rtnl_dellink (net/core/rtnetlink.c:3487 net/core/rtnetlink.c:3527) [ 24.873273][ T376] ? __pfx_rtnl_dellink (net/core/rtnetlink.c:3493) [ 24.873447][ T376] ? find_held_lock (kernel/locking/lockdep.c:5339) [ 24.873607][ T376] ? __lock_release (kernel/locking/lockdep.c:5525) [ 24.873780][ T376] ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/core/rtnetlink.c:6909) [ 24.873939][ T376] ? __pfx___lock_release (kernel/locking/lockdep.c:5501) [ 24.874099][ T376] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814) [ 24.874261][ T376] ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/core/rtnetlink.c:6909) [ 24.874422][ T376] ? __pfx_rtnl_dellink (net/core/rtnetlink.c:3493) [ 24.874581][ T376] rtnetlink_rcv_msg (net/core/rtnetlink.c:6911) [ 24.874752][ T376] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6814) [ 24.874934][ T376] ? 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) [ 24.875095][ T376] ? mark_lock (kernel/locking/lockdep.c:4727 (discriminator 3)) [ 24.875216][ T376] ? __lock_acquire (kernel/locking/lockdep.c:5226) [ 24.875376][ T376] netlink_rcv_skb (net/netlink/af_netlink.c:2543) [ 24.875536][ T376] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6814) [ 24.875705][ T376] ? __pfx_netlink_rcv_skb (net/netlink/af_netlink.c:2520) [ 24.875871][ T376] ? netlink_deliver_tap (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/netlink/af_netlink.c:340) [ 24.876035][ T376] ? 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) [ 24.876198][ T376] netlink_unicast (net/netlink/af_netlink.c:1322 net/netlink/af_netlink.c:1348) [ 24.876357][ T376] ? __pfx_netlink_unicast (net/netlink/af_netlink.c:1333) [ 24.876519][ T376] ? find_held_lock (kernel/locking/lockdep.c:5339) [ 24.876680][ T376] netlink_sendmsg (net/netlink/af_netlink.c:1892) [ 24.876845][ T376] ? __pfx_netlink_sendmsg (net/netlink/af_netlink.c:1811) [ 24.877007][ T376] ____sys_sendmsg (net/socket.c:711 net/socket.c:726 net/socket.c:2594) [ 24.877171][ T376] ? __pfx_____sys_sendmsg (net/socket.c:2540) [ 24.877329][ T376] ? __pfx_copy_msghdr_from_user (net/socket.c:2520) [ 24.877531][ T376] ___sys_sendmsg (net/socket.c:2650) [ 24.877693][ T376] ? __pfx____sys_sendmsg (net/socket.c:2637) [ 24.877854][ T376] ? kasan_save_stack (mm/kasan/common.c:49) [ 24.878016][ T376] ? kasan_save_stack (mm/kasan/common.c:48) [ 24.878173][ T376] ? __kasan_record_aux_stack (mm/kasan/generic.c:544) [ 24.878354][ T376] ? __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) [ 24.878558][ T376] ? __x64_sys_close (fs/open.c:1557 fs/open.c:1539 fs/open.c:1539) [ 24.878718][ T376] ? do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) [ 24.878880][ T376] ? entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) [ 24.879083][ T376] ? __lock_acquire (kernel/locking/lockdep.c:5226) [ 24.879244][ T376] ? find_held_lock (kernel/locking/lockdep.c:5339) [ 24.879406][ T376] ? __lock_release (kernel/locking/lockdep.c:5525) [ 24.879566][ T376] ? __virt_addr_valid (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:962 ./include/linux/mmzone.h:2058 arch/x86/mm/physaddr.c:65) [ 24.879732][ T376] ? __pfx___lock_release (kernel/locking/lockdep.c:5501) [ 24.879892][ T376] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814) [ 24.880054][ T376] __sys_sendmsg (net/socket.c:2680) [ 24.880213][ T376] ? __pfx___sys_sendmsg (net/socket.c:2665) [ 24.880377][ T376] ? __pfx_slab_free_after_rcu_debug (mm/slub.c:4643) [ 24.880579][ T376] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) [ 24.880744][ T376] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) [ 24.880953][ T376] RIP: 0033:0x7f4e754d69a7 [ 24.881144][ T376] 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) [ 24.881706][ T376] RSP: 002b:00007ffdc7bfdc18 EFLAGS: 00000246 ORIG_RAX: 000000000000002e [ 24.881953][ T376] RAX: ffffffffffffffda RBX: 00007ffdc7bfe340 RCX: 00007f4e754d69a7 [ 24.882195][ T376] RDX: 0000000000000000 RSI: 00007ffdc7bfdc80 RDI: 0000000000000005 [ 24.882442][ T376] RBP: 0000000000000002 R08: 0000000000000003 R09: 0000000000000078 [ 24.882683][ T376] R10: 00007f4e75394ef8 R11: 0000000000000246 R12: 0000000000000002 Finger prints: print_deadlock_bug:validate_chain:__lock_acquire:down_read:blocking_notifier_call_chain