====================================== | [ 46.070692][ T658] #0: ffffffffae7e7a48 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_dellink (net/core/rtnetlink.c:3521) | [ 46.071114][ T658] #1: ffffffffae7d6630 ((netdev_chain).rwsem){++++}-{4:4}, at: blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368) | [ 46.071580][ T658] | [ 46.071580][ T658] stack backtrace: [ 46.072225][ T658] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 46.072511][ T658] Call Trace: [ 46.072689][ T658] [ 46.072800][ T658] dump_stack_lvl (lib/dump_stack.c:123) [ 46.073061][ T658] print_deadlock_bug (kernel/locking/lockdep.c:3040) [ 46.073276][ T658] validate_chain (kernel/locking/lockdep.c:3894) [ 46.073481][ T658] ? __pfx_validate_chain (kernel/locking/lockdep.c:3860) [ 46.073643][ T658] ? 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) [ 46.073789][ T658] ? mark_lock (kernel/locking/lockdep.c:4727 (discriminator 3)) [ 46.073906][ T658] __lock_acquire (kernel/locking/lockdep.c:5226) [ 46.074081][ T658] lock_acquire.part.0 (kernel/locking/lockdep.c:467 kernel/locking/lockdep.c:5851) [ 46.074242][ T658] ? blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368) [ 46.074475][ T658] ? netconsole_process_cleanups_core (drivers/net/netconsole.c:242 (discriminator 11)) [ 46.074692][ T658] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814) [ 46.074884][ T658] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 37)) [ 46.075068][ T658] ? lock_acquire (kernel/locking/lockdep.c:5822) [ 46.075216][ T658] ? blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368) [ 46.075470][ T658] down_read (./arch/x86/include/asm/preempt.h:79 kernel/locking/rwsem.c:1246 kernel/locking/rwsem.c:1261 kernel/locking/rwsem.c:1526) [ 46.075648][ T658] ? blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368) [ 46.075946][ T658] ? __pfx_down_read (kernel/locking/rwsem.c:1522) [ 46.076186][ T658] ? __lock_release (kernel/locking/lockdep.c:5525) [ 46.076348][ T658] ? netconsole_netdev_event (drivers/net/netconsole.c:1082) [ 46.076505][ T658] ? __pfx___lock_release (kernel/locking/lockdep.c:5501) [ 46.076665][ T658] blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368) [ 46.076855][ T658] __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)) [ 46.077015][ T658] ? __pfx___netdev_upper_dev_unlink (net/core/dev.c:8151) [ 46.077205][ T658] ? __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) [ 46.077352][ T658] ? __pfx___mutex_unlock_slowpath (kernel/locking/mutex.c:890) [ 46.077541][ T658] ? rtnl_is_locked (net/core/rtnetlink.c:163) [ 46.077728][ T658] netdev_upper_dev_unlink (net/core/dev.c:8190) [ 46.077905][ T658] ? __pfx_netdev_upper_dev_unlink (net/core/dev.c:8190) [ 46.078137][ T658] ? netconsole_netdev_event (drivers/net/netconsole.c:1082) [ 46.078286][ T658] ? 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) [ 46.078442][ T658] ? rtnl_is_locked (net/core/rtnetlink.c:163) [ 46.078636][ T658] ? netdev_master_upper_dev_get (net/core/dev.c:7230) [ 46.078829][ T658] vrf_device_event (drivers/net/vrf.c:1110 drivers/net/vrf.c:1119 drivers/net/vrf.c:1804) vrf [ 46.078991][ T658] notifier_call_chain (kernel/notifier.c:85 (discriminator 2)) [ 46.079169][ T658] blocking_notifier_call_chain (kernel/notifier.c:381 kernel/notifier.c:368) [ 46.079315][ T658] unregister_netdevice_many_notify (net/core/dev.c:11575) [ 46.079503][ T658] ? __pfx_unregister_netdevice_many_notify (net/core/dev.c:11516) [ 46.079685][ T658] ? net_generic (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 ./include/net/netns/generic.h:48) ip6_gre [ 46.079842][ T658] ? __pfx___lock_release (kernel/locking/lockdep.c:5501) [ 46.079993][ T658] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814) [ 46.080178][ T658] ? rtnl_is_locked (net/core/rtnetlink.c:163) [ 46.080327][ T658] ? unregister_netdevice_queue (net/core/dev.c:11501) [ 46.080512][ T658] ? __pfx_unregister_netdevice_queue (net/core/dev.c:11500) [ 46.080692][ T658] ? net_generic (./include/net/netns/generic.h:51) ip6_gre [ 46.080841][ T658] rtnl_dellink (net/core/rtnetlink.c:3487 net/core/rtnetlink.c:3527) [ 46.081005][ T658] ? __pfx_rtnl_dellink (net/core/rtnetlink.c:3493) [ 46.081176][ T658] ? find_held_lock (kernel/locking/lockdep.c:5339) [ 46.081326][ T658] ? __lock_release (kernel/locking/lockdep.c:5525) [ 46.081471][ T658] ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/core/rtnetlink.c:6909) [ 46.081616][ T658] ? __pfx___lock_release (kernel/locking/lockdep.c:5501) [ 46.081762][ T658] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814) [ 46.081909][ T658] ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/core/rtnetlink.c:6909) [ 46.082070][ T658] ? __pfx_rtnl_dellink (net/core/rtnetlink.c:3493) [ 46.082218][ T658] rtnetlink_rcv_msg (net/core/rtnetlink.c:6911) [ 46.082364][ T658] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6814) [ 46.082509][ T658] ? 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) [ 46.082654][ T658] ? mark_lock (kernel/locking/lockdep.c:4727 (discriminator 3)) [ 46.082765][ T658] ? __lock_acquire (kernel/locking/lockdep.c:5226) [ 46.082917][ T658] netlink_rcv_skb (net/netlink/af_netlink.c:2543) [ 46.083094][ T658] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6814) [ 46.083250][ T658] ? __pfx_netlink_rcv_skb (net/netlink/af_netlink.c:2520) [ 46.083400][ T658] ? netlink_deliver_tap (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/netlink/af_netlink.c:340) [ 46.083547][ T658] ? 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) [ 46.083694][ T658] netlink_unicast (net/netlink/af_netlink.c:1322 net/netlink/af_netlink.c:1348) [ 46.083840][ T658] ? __pfx_netlink_unicast (net/netlink/af_netlink.c:1333) [ 46.084000][ T658] ? find_held_lock (kernel/locking/lockdep.c:5339) [ 46.084166][ T658] netlink_sendmsg (net/netlink/af_netlink.c:1892) [ 46.084322][ T658] ? __pfx_netlink_sendmsg (net/netlink/af_netlink.c:1811) [ 46.084469][ T658] ____sys_sendmsg (net/socket.c:711 net/socket.c:726 net/socket.c:2594) [ 46.084618][ T658] ? __pfx_____sys_sendmsg (net/socket.c:2540) [ 46.084763][ T658] ? __pfx_copy_msghdr_from_user (net/socket.c:2520) [ 46.084956][ T658] ___sys_sendmsg (net/socket.c:2650) [ 46.085112][ T658] ? __pfx____sys_sendmsg (net/socket.c:2637) [ 46.085260][ T658] ? kasan_save_stack (mm/kasan/common.c:49) [ 46.085416][ T658] ? kasan_save_stack (mm/kasan/common.c:48) [ 46.085561][ T658] ? __kasan_record_aux_stack (mm/kasan/generic.c:544) [ 46.085708][ T658] ? __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) [ 46.085894][ T658] ? __x64_sys_close (fs/open.c:1557 fs/open.c:1539 fs/open.c:1539) [ 46.086053][ T658] ? do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) [ 46.086203][ T658] ? entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) [ 46.086387][ T658] ? __lock_acquire (kernel/locking/lockdep.c:5226) [ 46.086548][ T658] ? find_held_lock (kernel/locking/lockdep.c:5339) [ 46.086695][ T658] ? __lock_release (kernel/locking/lockdep.c:5525) [ 46.086840][ T658] ? __virt_addr_valid (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:962 ./include/linux/mmzone.h:2058 arch/x86/mm/physaddr.c:65) [ 46.086990][ T658] ? __pfx___lock_release (kernel/locking/lockdep.c:5501) [ 46.087145][ T658] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814) [ 46.087292][ T658] __sys_sendmsg (net/socket.c:2680) [ 46.087439][ T658] ? __pfx___sys_sendmsg (net/socket.c:2665) [ 46.087605][ T658] ? __pfx_slab_free_after_rcu_debug (mm/slub.c:4643) [ 46.087862][ T658] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) [ 46.088023][ T658] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) [ 46.088293][ T658] RIP: 0033:0x7fb5b82a99a7 [ 46.088453][ T658] 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) [ 46.089134][ T658] RSP: 002b:00007fff4b3a6fd8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e [ 46.089377][ T658] RAX: ffffffffffffffda RBX: 00007fff4b3a7700 RCX: 00007fb5b82a99a7 [ 46.089618][ T658] RDX: 0000000000000000 RSI: 00007fff4b3a7040 RDI: 0000000000000005 [ 46.089860][ T658] RBP: 0000000000000002 R08: 0000000000000003 R09: 0000000000000078 [ 46.090112][ T658] R10: 00007fb5b8167ef8 R11: 0000000000000246 R12: 0000000000000002 Finger prints: print_deadlock_bug:validate_chain:__lock_acquire:down_read:blocking_notifier_call_chain