====================================== | [ 46.183551][ T656] #0: ffffffff88fe7a48 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_dellink (net/core/rtnetlink.c:3512) | [ 46.183851][ T656] #1: ffffffff88fd6630 ((netdev_chain).rwsem){++++}-{4:4}, at: blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368) | [ 46.184151][ T656] | [ 46.184151][ T656] stack backtrace: [ 46.184558][ T656] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 46.184740][ T656] Call Trace: [ 46.184853][ T656] [ 46.184928][ T656] dump_stack_lvl (lib/dump_stack.c:123) [ 46.185084][ T656] print_deadlock_bug (kernel/locking/lockdep.c:3040) [ 46.185244][ T656] validate_chain (kernel/locking/lockdep.c:3894) [ 46.185396][ T656] ? __pfx_validate_chain (kernel/locking/lockdep.c:3860) [ 46.185543][ T656] ? 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) [ 46.185690][ T656] ? mark_lock (kernel/locking/lockdep.c:4727 (discriminator 3)) [ 46.185803][ T656] __lock_acquire (kernel/locking/lockdep.c:5226) [ 46.185955][ T656] lock_acquire.part.0 (kernel/locking/lockdep.c:467 kernel/locking/lockdep.c:5851) [ 46.186105][ T656] ? blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368) [ 46.186301][ T656] ? netconsole_process_cleanups_core (drivers/net/netconsole.c:242 (discriminator 11)) [ 46.186512][ T656] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814) [ 46.186672][ T656] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 37)) [ 46.186820][ T656] ? lock_acquire (kernel/locking/lockdep.c:5822) [ 46.186967][ T656] ? blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368) [ 46.187148][ T656] down_read (./arch/x86/include/asm/preempt.h:79 kernel/locking/rwsem.c:1246 kernel/locking/rwsem.c:1261 kernel/locking/rwsem.c:1526) [ 46.187267][ T656] ? blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368) [ 46.187453][ T656] ? __pfx_down_read (kernel/locking/rwsem.c:1522) [ 46.187605][ T656] ? __lock_release (kernel/locking/lockdep.c:5525) [ 46.187753][ T656] ? netconsole_netdev_event (drivers/net/netconsole.c:1082) [ 46.187900][ T656] ? __pfx___lock_release (kernel/locking/lockdep.c:5501) [ 46.188047][ T656] blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368) [ 46.188196][ T656] __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)) [ 46.188342][ T656] ? __pfx___netdev_upper_dev_unlink (net/core/dev.c:8151) [ 46.188545][ T656] ? __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) [ 46.188695][ T656] ? __pfx___mutex_unlock_slowpath (kernel/locking/mutex.c:890) [ 46.188879][ T656] ? rtnl_is_locked (net/core/rtnetlink.c:164) [ 46.189036][ T656] netdev_upper_dev_unlink (net/core/dev.c:8190) [ 46.189184][ T656] ? __pfx_netdev_upper_dev_unlink (net/core/dev.c:8190) [ 46.189392][ T656] ? netconsole_netdev_event (drivers/net/netconsole.c:1082) [ 46.189540][ T656] ? 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) [ 46.189696][ T656] ? rtnl_is_locked (net/core/rtnetlink.c:164) [ 46.189841][ T656] ? netdev_master_upper_dev_get (net/core/dev.c:7230) [ 46.190034][ T656] vrf_device_event (drivers/net/vrf.c:1110 drivers/net/vrf.c:1119 drivers/net/vrf.c:1804) vrf [ 46.190198][ T656] notifier_call_chain (kernel/notifier.c:85 (discriminator 2)) [ 46.190362][ T656] blocking_notifier_call_chain (kernel/notifier.c:381 kernel/notifier.c:368) [ 46.190530][ T656] unregister_netdevice_many_notify (net/core/dev.c:11571) [ 46.190737][ T656] ? __pfx_unregister_netdevice_many_notify (net/core/dev.c:11512) [ 46.190946][ T656] ? net_generic (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 ./include/net/netns/generic.h:48) ip6_gre [ 46.191116][ T656] ? __pfx___lock_release (kernel/locking/lockdep.c:5501) [ 46.191286][ T656] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814) [ 46.191450][ T656] ? rtnl_is_locked (net/core/rtnetlink.c:164) [ 46.191612][ T656] ? unregister_netdevice_queue (net/core/dev.c:11497) [ 46.191810][ T656] ? __pfx_unregister_netdevice_queue (net/core/dev.c:11496) [ 46.192019][ T656] ? net_generic (./include/net/netns/generic.h:51) ip6_gre [ 46.192189][ T656] rtnl_dellink (net/core/rtnetlink.c:3478 net/core/rtnetlink.c:3518) [ 46.192353][ T656] ? __pfx_rtnl_dellink (net/core/rtnetlink.c:3484) [ 46.192531][ T656] ? find_held_lock (kernel/locking/lockdep.c:5339) [ 46.192696][ T656] ? __lock_release (kernel/locking/lockdep.c:5525) [ 46.192860][ T656] ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/core/rtnetlink.c:6900) [ 46.193022][ T656] ? __pfx___lock_release (kernel/locking/lockdep.c:5501) [ 46.193192][ T656] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814) [ 46.193355][ T656] ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/core/rtnetlink.c:6900) [ 46.193518][ T656] ? __pfx_rtnl_dellink (net/core/rtnetlink.c:3484) [ 46.193679][ T656] rtnetlink_rcv_msg (net/core/rtnetlink.c:6902) [ 46.193845][ T656] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6805) [ 46.194007][ T656] ? 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) [ 46.194164][ T656] ? mark_lock (kernel/locking/lockdep.c:4727 (discriminator 3)) [ 46.194288][ T656] ? __lock_acquire (kernel/locking/lockdep.c:5226) [ 46.194457][ T656] netlink_rcv_skb (net/netlink/af_netlink.c:2543) [ 46.194620][ T656] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6805) [ 46.194802][ T656] ? __pfx_netlink_rcv_skb (net/netlink/af_netlink.c:2520) [ 46.194971][ T656] ? netlink_deliver_tap (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/netlink/af_netlink.c:340) [ 46.195136][ T656] ? 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) [ 46.195299][ T656] netlink_unicast (net/netlink/af_netlink.c:1322 net/netlink/af_netlink.c:1348) [ 46.195464][ T656] ? __pfx_netlink_unicast (net/netlink/af_netlink.c:1333) [ 46.195630][ T656] ? find_held_lock (kernel/locking/lockdep.c:5339) [ 46.195799][ T656] netlink_sendmsg (net/netlink/af_netlink.c:1892) [ 46.195965][ T656] ? __pfx_netlink_sendmsg (net/netlink/af_netlink.c:1811) [ 46.196129][ T656] ____sys_sendmsg (net/socket.c:711 net/socket.c:726 net/socket.c:2594) [ 46.196297][ T656] ? __pfx_____sys_sendmsg (net/socket.c:2540) [ 46.196459][ T656] ? __pfx_copy_msghdr_from_user (net/socket.c:2520) [ 46.196667][ T656] ___sys_sendmsg (net/socket.c:2650) [ 46.196832][ T656] ? __pfx____sys_sendmsg (net/socket.c:2637) [ 46.196994][ T656] ? kasan_save_stack (mm/kasan/common.c:49) [ 46.197160][ T656] ? kasan_save_stack (mm/kasan/common.c:48) [ 46.197327][ T656] ? __kasan_record_aux_stack (mm/kasan/generic.c:544) [ 46.197492][ T656] ? __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) [ 46.197694][ T656] ? __x64_sys_close (fs/open.c:1557 fs/open.c:1539 fs/open.c:1539) [ 46.197857][ T656] ? do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) [ 46.198025][ T656] ? entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) [ 46.198233][ T656] ? __lock_acquire (kernel/locking/lockdep.c:5226) [ 46.198399][ T656] ? find_held_lock (kernel/locking/lockdep.c:5339) [ 46.198563][ T656] ? __lock_release (kernel/locking/lockdep.c:5525) [ 46.198723][ T656] ? __virt_addr_valid (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:962 ./include/linux/mmzone.h:2058 arch/x86/mm/physaddr.c:65) [ 46.198887][ T656] ? __pfx___lock_release (kernel/locking/lockdep.c:5501) [ 46.199052][ T656] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814) [ 46.199225][ T656] __sys_sendmsg (net/socket.c:2680) [ 46.199398][ T656] ? __pfx___sys_sendmsg (net/socket.c:2665) [ 46.199559][ T656] ? __pfx_slab_free_after_rcu_debug (mm/slub.c:4643) [ 46.199765][ T656] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) [ 46.199929][ T656] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) [ 46.200132][ T656] RIP: 0033:0x7f751d8d49a7 [ 46.200307][ T656] 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) [ 46.200881][ T656] RSP: 002b:00007ffd11012478 EFLAGS: 00000246 ORIG_RAX: 000000000000002e [ 46.201126][ T656] RAX: ffffffffffffffda RBX: 00007ffd11012ba0 RCX: 00007f751d8d49a7 [ 46.201371][ T656] RDX: 0000000000000000 RSI: 00007ffd110124e0 RDI: 0000000000000005 [ 46.201620][ T656] RBP: 0000000000000002 R08: 0000000000000003 R09: 0000000000000078 [ 46.201863][ T656] R10: 00007f751d792ef8 R11: 0000000000000246 R12: 0000000000000002 Finger prints: print_deadlock_bug:validate_chain:__lock_acquire:down_read:blocking_notifier_call_chain