====================================== | [ 27.856288][ T375] #0: ffffffff96bf1088 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_dellink (net/core/rtnetlink.c:3521) | [ 27.856573][ T375] #1: ffffffff96bdfc30 ((netdev_chain).rwsem){++++}-{4:4}, at: blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368) | [ 27.856880][ T375] | [ 27.856880][ T375] stack backtrace: [ 27.857307][ T375] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 27.857498][ T375] Call Trace: [ 27.857619][ T375] [ 27.857699][ T375] dump_stack_lvl (lib/dump_stack.c:123) [ 27.857860][ T375] print_deadlock_bug (kernel/locking/lockdep.c:3040) [ 27.858022][ T375] validate_chain (kernel/locking/lockdep.c:3894) [ 27.858179][ T375] ? __pfx_validate_chain (kernel/locking/lockdep.c:3860) [ 27.858336][ T375] ? 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) [ 27.858497][ T375] ? mark_lock (kernel/locking/lockdep.c:4727 (discriminator 3)) [ 27.858614][ T375] __lock_acquire (kernel/locking/lockdep.c:5226) [ 27.858770][ T375] lock_acquire.part.0 (kernel/locking/lockdep.c:467 kernel/locking/lockdep.c:5851) [ 27.858924][ T375] ? blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368) [ 27.859112][ T375] ? find_held_lock (kernel/locking/lockdep.c:5339) [ 27.859267][ T375] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814) [ 27.859419][ T375] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 37)) [ 27.859582][ T375] ? lock_acquire (kernel/locking/lockdep.c:5822) [ 27.859750][ T375] ? blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368) [ 27.859941][ T375] down_read (./arch/x86/include/asm/preempt.h:79 kernel/locking/rwsem.c:1246 kernel/locking/rwsem.c:1261 kernel/locking/rwsem.c:1526) [ 27.860058][ T375] ? blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368) [ 27.860249][ T375] ? __pfx_down_read (kernel/locking/rwsem.c:1522) [ 27.860401][ T375] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4339 kernel/locking/lockdep.c:4406) [ 27.860592][ T375] blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368) [ 27.860751][ T375] __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)) [ 27.860915][ T375] ? __pfx___netdev_upper_dev_unlink (net/core/dev.c:8151) [ 27.861104][ T375] ? find_held_lock (kernel/locking/lockdep.c:5339) [ 27.861259][ T375] ? del_nbp (net/bridge/br_if.c:215 net/bridge/br_if.c:359) bridge [ 27.861450][ T375] ? 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) [ 27.861603][ T375] netdev_upper_dev_unlink (net/core/dev.c:8190) [ 27.861760][ T375] ? __pfx_netdev_upper_dev_unlink (net/core/dev.c:8190) [ 27.861953][ T375] ? mutex_spin_on_owner (kernel/locking/mutex.c:353) [ 27.862109][ T375] ? rtnl_is_locked (net/core/rtnetlink.c:163) [ 27.862264][ T375] del_nbp (net/bridge/br_if.c:365) bridge [ 27.862447][ T375] br_del_if (net/bridge/br_if.c:741) bridge [ 27.862629][ T375] br_device_event (net/bridge/br.c:141) bridge [ 27.862811][ T375] ? __pfx_br_device_event (net/bridge/br.c:29) bridge [ 27.863026][ T375] ? ip_vs_dst_event (./include/net/net_namespace.h:393 ./include/linux/netdevice.h:2639 net/netfilter/ipvs/ip_vs_ctl.c:1769) ip_vs [ 27.863200][ T375] ? packet_notifier (net/packet/af_packet.c:4282) [ 27.863355][ T375] notifier_call_chain (kernel/notifier.c:85 (discriminator 2)) [ 27.863509][ T375] blocking_notifier_call_chain (kernel/notifier.c:381 kernel/notifier.c:368) [ 27.863675][ T375] unregister_netdevice_many_notify (net/core/dev.c:11575) [ 27.863874][ T375] ? __pfx_unregister_netdevice_many_notify (net/core/dev.c:11516) [ 27.864064][ T375] ? rtnl_dellink (net/core/rtnetlink.c:3521) [ 27.864217][ T375] ? sock_def_readable (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/core/sock.c:3479) [ 27.864378][ T375] ? rtnl_is_locked (net/core/rtnetlink.c:163) [ 27.864531][ T375] ? unregister_netdevice_queue (net/core/dev.c:11501) [ 27.864720][ T375] ? __pfx_unregister_netdevice_queue (net/core/dev.c:11500) [ 27.864919][ T375] ? __pfx_unregister_netdevice_queue (net/core/dev.c:11500) [ 27.865110][ T375] rtnl_dellink (net/core/rtnetlink.c:3487 net/core/rtnetlink.c:3527) [ 27.865267][ T375] ? __pfx_rtnl_dellink (net/core/rtnetlink.c:3493) [ 27.865434][ T375] ? find_held_lock (kernel/locking/lockdep.c:5339) [ 27.865591][ T375] ? __lock_release (kernel/locking/lockdep.c:5525) [ 27.865761][ T375] ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/core/rtnetlink.c:6909) [ 27.865917][ T375] ? __pfx___lock_release (kernel/locking/lockdep.c:5501) [ 27.866072][ T375] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814) [ 27.866227][ T375] ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/core/rtnetlink.c:6909) [ 27.866379][ T375] ? __pfx_rtnl_dellink (net/core/rtnetlink.c:3493) [ 27.866532][ T375] rtnetlink_rcv_msg (net/core/rtnetlink.c:6911) [ 27.866690][ T375] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6814) [ 27.866846][ T375] ? 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) [ 27.866999][ T375] ? mark_lock (kernel/locking/lockdep.c:4727 (discriminator 3)) [ 27.867116][ T375] ? __lock_acquire (kernel/locking/lockdep.c:5226) [ 27.867270][ T375] netlink_rcv_skb (net/netlink/af_netlink.c:2543) [ 27.867428][ T375] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6814) [ 27.867581][ T375] ? __pfx_netlink_rcv_skb (net/netlink/af_netlink.c:2520) [ 27.867748][ T375] ? netlink_deliver_tap (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/netlink/af_netlink.c:340) [ 27.867912][ T375] ? 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) [ 27.868067][ T375] netlink_unicast (net/netlink/af_netlink.c:1322 net/netlink/af_netlink.c:1348) [ 27.868220][ T375] ? __pfx_netlink_unicast (net/netlink/af_netlink.c:1333) [ 27.868371][ T375] ? find_held_lock (kernel/locking/lockdep.c:5339) [ 27.868530][ T375] ? __lock_release (kernel/locking/lockdep.c:5525) [ 27.868686][ T375] netlink_sendmsg (net/netlink/af_netlink.c:1892) [ 27.868846][ T375] ? __pfx_netlink_sendmsg (net/netlink/af_netlink.c:1811) [ 27.869013][ T375] ? _copy_from_user (./arch/x86/include/asm/smap.h:33 ./arch/x86/include/asm/uaccess_64.h:134 ./arch/x86/include/asm/uaccess_64.h:141 ./include/linux/uaccess.h:178 lib/usercopy.c:18) [ 27.869174][ T375] ____sys_sendmsg (net/socket.c:711 net/socket.c:726 net/socket.c:2594) [ 27.869330][ T375] ? __pfx_____sys_sendmsg (net/socket.c:2540) [ 27.869483][ T375] ? __pfx_copy_msghdr_from_user (net/socket.c:2520) [ 27.869682][ T375] ___sys_sendmsg (net/socket.c:2650) [ 27.869843][ T375] ? __pfx____sys_sendmsg (net/socket.c:2637) [ 27.869998][ T375] ? kasan_save_stack (mm/kasan/common.c:49) [ 27.870161][ T375] ? kasan_save_stack (mm/kasan/common.c:48) [ 27.870315][ T375] ? __kasan_record_aux_stack (mm/kasan/generic.c:544) [ 27.870470][ T375] ? __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) [ 27.870662][ T375] ? __x64_sys_close (fs/open.c:1557 fs/open.c:1539 fs/open.c:1539) [ 27.870819][ T375] ? do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) [ 27.870977][ T375] ? entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) [ 27.871167][ T375] ? __lock_acquire (kernel/locking/lockdep.c:5226) [ 27.871335][ T375] ? find_held_lock (kernel/locking/lockdep.c:5339) [ 27.871488][ T375] ? __lock_release (kernel/locking/lockdep.c:5525) [ 27.871642][ T375] ? __virt_addr_valid (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:962 ./include/linux/mmzone.h:2058 arch/x86/mm/physaddr.c:65) [ 27.871806][ T375] ? __pfx___lock_release (kernel/locking/lockdep.c:5501) [ 27.871959][ T375] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814) [ 27.872113][ T375] __sys_sendmsg (net/socket.c:2680) [ 27.872267][ T375] ? __pfx___sys_sendmsg (net/socket.c:2665) [ 27.872423][ T375] ? __pfx_slab_free_after_rcu_debug (mm/slub.c:4643) [ 27.872620][ T375] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) [ 27.872775][ T375] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) [ 27.872965][ T375] RIP: 0033:0x7f188555d9a7 [ 27.873129][ T375] 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) [ 27.873681][ T375] RSP: 002b:00007ffc28a35808 EFLAGS: 00000246 ORIG_RAX: 000000000000002e [ 27.873920][ T375] RAX: ffffffffffffffda RBX: 00007ffc28a35f30 RCX: 00007f188555d9a7 [ 27.874153][ T375] RDX: 0000000000000000 RSI: 00007ffc28a35870 RDI: 0000000000000005 [ 27.874382][ T375] RBP: 0000000000000001 R08: 0000000000000003 R09: 0000000000000078 [ 27.874618][ T375] R10: 00007f188541bef8 R11: 0000000000000246 R12: 0000000000000001 Finger prints: print_deadlock_bug:validate_chain:__lock_acquire:down_read:blocking_notifier_call_chain