====================================== | [836.181592][T10536] #0: ffffffff9c7e7a48 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_dellink (net/core/rtnetlink.c:3521) | [836.181904][T10536] #1: ffffffff9c7d6630 ((netdev_chain).rwsem){++++}-{4:4}, at: blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368) | [ 836.182241][T10536] | [ 836.182241][T10536] stack backtrace: [ 836.182688][T10536] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 836.182900][T10536] Call Trace: [ 836.183038][T10536] [836.183125][T10536] dump_stack_lvl (lib/dump_stack.c:123) [836.183295][T10536] print_deadlock_bug (kernel/locking/lockdep.c:3040) [836.183474][T10536] validate_chain (kernel/locking/lockdep.c:3894) [836.183633][T10536] ? __pfx_validate_chain (kernel/locking/lockdep.c:3860) [836.183804][T10536] ? 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) [836.183976][T10536] ? mark_lock (kernel/locking/lockdep.c:4727 (discriminator 3)) [836.184109][T10536] __lock_acquire (kernel/locking/lockdep.c:5226) [836.184281][T10536] lock_acquire.part.0 (kernel/locking/lockdep.c:467 kernel/locking/lockdep.c:5851) [836.184435][T10536] ? blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368) [836.184651][T10536] ? netconsole_process_cleanups_core (drivers/net/netconsole.c:242 (discriminator 11)) [836.184861][T10536] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814) [836.185028][T10536] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 37)) [836.185197][T10536] ? lock_acquire (kernel/locking/lockdep.c:5822) [836.185359][T10536] ? blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368) [836.185563][T10536] down_read (./arch/x86/include/asm/preempt.h:79 kernel/locking/rwsem.c:1246 kernel/locking/rwsem.c:1261 kernel/locking/rwsem.c:1526) [836.185682][T10536] ? blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368) [836.185886][T10536] ? __pfx_down_read (kernel/locking/rwsem.c:1522) [836.186050][T10536] ? __lock_release (kernel/locking/lockdep.c:5525) [836.186214][T10536] ? netconsole_netdev_event (drivers/net/netconsole.c:1082) [836.186376][T10536] ? __pfx___lock_release (kernel/locking/lockdep.c:5501) [836.186536][T10536] blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368) [836.186702][T10536] __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)) [836.186867][T10536] ? __pfx___netdev_upper_dev_unlink (net/core/dev.c:8151) [836.187071][T10536] ? __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) [836.187240][T10536] ? __pfx___mutex_unlock_slowpath (kernel/locking/mutex.c:890) [836.187440][T10536] ? rtnl_is_locked (net/core/rtnetlink.c:163) [836.187601][T10536] netdev_upper_dev_unlink (net/core/dev.c:8190) [836.187764][T10536] ? __pfx_netdev_upper_dev_unlink (net/core/dev.c:8190) [836.187979][T10536] ? netconsole_netdev_event (drivers/net/netconsole.c:1082) [836.188140][T10536] ? 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) [836.188300][T10536] ? rtnl_is_locked (net/core/rtnetlink.c:163) [836.188456][T10536] ? netdev_master_upper_dev_get (net/core/dev.c:7230) [836.188652][T10536] vrf_device_event (drivers/net/vrf.c:1110 drivers/net/vrf.c:1119 drivers/net/vrf.c:1804) vrf [836.188818][T10536] notifier_call_chain (kernel/notifier.c:85 (discriminator 2)) [836.188981][T10536] blocking_notifier_call_chain (kernel/notifier.c:381 kernel/notifier.c:368) [836.189167][T10536] unregister_netdevice_many_notify (net/core/dev.c:11575) [836.189389][T10536] ? 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) [836.189555][T10536] ? mark_lock (kernel/locking/lockdep.c:4727 (discriminator 3)) [836.189684][T10536] ? __pfx_unregister_netdevice_many_notify (net/core/dev.c:11516) [836.189882][T10536] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4347 kernel/locking/lockdep.c:4406) [836.190087][T10536] ? kfree (mm/slub.c:4613 mm/slub.c:4761) [836.190225][T10536] ? vlan_vid_del (net/8021q/vlan_core.c:368 net/8021q/vlan_core.c:387) [836.190397][T10536] ? vlan_vid_del (net/8021q/vlan_core.c:368 net/8021q/vlan_core.c:387) [836.190566][T10536] rtnl_dellink (net/core/rtnetlink.c:3487 net/core/rtnetlink.c:3527) [836.190733][T10536] ? __pfx_rtnl_dellink (net/core/rtnetlink.c:3493) [836.190915][T10536] ? find_held_lock (kernel/locking/lockdep.c:5339) [836.191079][T10536] ? __lock_release (kernel/locking/lockdep.c:5525) [836.191236][T10536] ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/core/rtnetlink.c:6909) [836.191406][T10536] ? __pfx___lock_release (kernel/locking/lockdep.c:5501) [836.191571][T10536] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814) [836.191750][T10536] ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/core/rtnetlink.c:6909) [836.191909][T10536] ? __pfx_rtnl_dellink (net/core/rtnetlink.c:3493) [836.192081][T10536] rtnetlink_rcv_msg (net/core/rtnetlink.c:6911) [836.192238][T10536] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6814) [836.192414][T10536] ? 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) [836.192574][T10536] ? mark_lock (kernel/locking/lockdep.c:4727 (discriminator 3)) [836.192695][T10536] ? __lock_acquire (kernel/locking/lockdep.c:5226) [836.192866][T10536] netlink_rcv_skb (net/netlink/af_netlink.c:2543) [836.193025][T10536] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6814) [836.193205][T10536] ? __pfx_netlink_rcv_skb (net/netlink/af_netlink.c:2520) [836.193380][T10536] ? netlink_deliver_tap (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/netlink/af_netlink.c:340) [836.193560][T10536] ? 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) [836.193737][T10536] netlink_unicast (net/netlink/af_netlink.c:1322 net/netlink/af_netlink.c:1348) [836.193911][T10536] ? __pfx_netlink_unicast (net/netlink/af_netlink.c:1333) [836.194082][T10536] ? find_held_lock (kernel/locking/lockdep.c:5339) [836.194256][T10536] netlink_sendmsg (net/netlink/af_netlink.c:1892) [836.194416][T10536] ? __pfx_netlink_sendmsg (net/netlink/af_netlink.c:1811) [836.194576][T10536] ____sys_sendmsg (net/socket.c:711 net/socket.c:726 net/socket.c:2594) [836.194737][T10536] ? __pfx_____sys_sendmsg (net/socket.c:2540) [836.194899][T10536] ? __pfx_copy_msghdr_from_user (net/socket.c:2520) [836.195098][T10536] ___sys_sendmsg (net/socket.c:2650) [836.195258][T10536] ? __pfx____sys_sendmsg (net/socket.c:2637) [836.195417][T10536] ? kasan_save_stack (mm/kasan/common.c:49) [836.195573][T10536] ? kasan_save_stack (mm/kasan/common.c:48) [836.195727][T10536] ? __kasan_record_aux_stack (mm/kasan/generic.c:544) [836.195887][T10536] ? __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) [836.196091][T10536] ? __x64_sys_close (fs/open.c:1557 fs/open.c:1539 fs/open.c:1539) [836.196254][T10536] ? do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) [836.196412][T10536] ? entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) [836.196615][T10536] ? __lock_acquire (kernel/locking/lockdep.c:5226) [836.196784][T10536] ? find_held_lock (kernel/locking/lockdep.c:5339) [836.196944][T10536] ? __lock_release (kernel/locking/lockdep.c:5525) [836.197101][T10536] ? __virt_addr_valid (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:962 ./include/linux/mmzone.h:2058 arch/x86/mm/physaddr.c:65) [836.197259][T10536] ? __pfx___lock_release (kernel/locking/lockdep.c:5501) [836.197418][T10536] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814) [836.197584][T10536] __sys_sendmsg (net/socket.c:2680) [836.197747][T10536] ? __pfx___sys_sendmsg (net/socket.c:2665) [836.197906][T10536] ? __pfx_slab_free_after_rcu_debug (mm/slub.c:4643) [836.198108][T10536] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) [836.198265][T10536] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) [ 836.198458][T10536] RIP: 0033:0x7fcb9521e9a7 [ 836.198626][T10536] 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) [ 836.199193][T10536] RSP: 002b:00007ffdd19b2fe8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e [ 836.199437][T10536] RAX: ffffffffffffffda RBX: 00007ffdd19b3710 RCX: 00007fcb9521e9a7 [ 836.199677][T10536] RDX: 0000000000000000 RSI: 00007ffdd19b3050 RDI: 0000000000000005 [ 836.199923][T10536] RBP: 0000000000000002 R08: 0000000000000003 R09: 0000000000000078 [ 836.200170][T10536] R10: 00007fcb950dcef8 R11: 0000000000000246 R12: 0000000000000002 Finger prints: print_deadlock_bug:validate_chain:__lock_acquire:down_read:blocking_notifier_call_chain