====================================== | [ 29.234916][ T439] #0: ffffffffa3de7a48 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_dellink (net/core/rtnetlink.c:3521) | [ 29.235346][ T439] #1: ffffffffa3dd6630 ((netdev_chain).rwsem){++++}-{4:4}, at: blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368) | [ 29.235863][ T439] | [ 29.235863][ T439] stack backtrace: [ 29.236483][ T439] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 29.236752][ T439] Call Trace: [ 29.236915][ T439] [ 29.237028][ T439] dump_stack_lvl (lib/dump_stack.c:123) [ 29.237246][ T439] print_deadlock_bug (kernel/locking/lockdep.c:3040) [ 29.237463][ T439] validate_chain (kernel/locking/lockdep.c:3894) [ 29.237680][ T439] ? __pfx_validate_chain (kernel/locking/lockdep.c:3860) [ 29.237895][ T439] ? 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) [ 29.238111][ T439] ? mark_lock (kernel/locking/lockdep.c:4727 (discriminator 3)) [ 29.238290][ T439] __lock_acquire (kernel/locking/lockdep.c:5226) [ 29.238509][ T439] lock_acquire.part.0 (kernel/locking/lockdep.c:467 kernel/locking/lockdep.c:5851) [ 29.238723][ T439] ? blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368) [ 29.238991][ T439] ? netconsole_process_cleanups_core (drivers/net/netconsole.c:242 (discriminator 11)) [ 29.239260][ T439] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814) [ 29.239475][ T439] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 37)) [ 29.239696][ T439] ? lock_acquire (kernel/locking/lockdep.c:5822) [ 29.239923][ T439] ? blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368) [ 29.240209][ T439] down_read (./arch/x86/include/asm/preempt.h:79 kernel/locking/rwsem.c:1246 kernel/locking/rwsem.c:1261 kernel/locking/rwsem.c:1526) [ 29.240383][ T439] ? blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368) [ 29.240666][ T439] ? __pfx_down_read (kernel/locking/rwsem.c:1522) [ 29.240892][ T439] ? __lock_release (kernel/locking/lockdep.c:5525) [ 29.241114][ T439] ? netconsole_netdev_event (drivers/net/netconsole.c:1082) [ 29.241335][ T439] ? __pfx___lock_release (kernel/locking/lockdep.c:5501) [ 29.241558][ T439] blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368) [ 29.241777][ T439] __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)) [ 29.241997][ T439] ? __pfx___netdev_upper_dev_unlink (net/core/dev.c:8151) [ 29.242255][ T439] ? __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) [ 29.242468][ T439] ? __pfx___mutex_unlock_slowpath (kernel/locking/mutex.c:890) [ 29.242749][ T439] ? rtnl_is_locked (net/core/rtnetlink.c:163) [ 29.242978][ T439] netdev_upper_dev_unlink (net/core/dev.c:8190) [ 29.243192][ T439] ? __pfx_netdev_upper_dev_unlink (net/core/dev.c:8190) [ 29.243463][ T439] ? netconsole_netdev_event (drivers/net/netconsole.c:1082) [ 29.243699][ T439] ? 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) [ 29.243931][ T439] ? rtnl_is_locked (net/core/rtnetlink.c:163) [ 29.244165][ T439] ? netdev_master_upper_dev_get (net/core/dev.c:7230) [ 29.244445][ T439] vrf_device_event (drivers/net/vrf.c:1110 drivers/net/vrf.c:1119 drivers/net/vrf.c:1804) vrf [ 29.244692][ T439] notifier_call_chain (kernel/notifier.c:85 (discriminator 2)) [ 29.244911][ T439] blocking_notifier_call_chain (kernel/notifier.c:381 kernel/notifier.c:368) [ 29.245136][ T439] unregister_netdevice_many_notify (net/core/dev.c:11575) [ 29.245401][ T439] ? find_held_lock (kernel/locking/lockdep.c:5339) [ 29.245622][ T439] ? __pfx_unregister_netdevice_many_notify (net/core/dev.c:11516) [ 29.245901][ T439] ? __pfx___lock_release (kernel/locking/lockdep.c:5501) [ 29.246114][ T439] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814) [ 29.246359][ T439] ? rtnl_is_locked (net/core/rtnetlink.c:163) [ 29.246582][ T439] ? unregister_netdevice_queue (net/core/dev.c:11501) [ 29.246861][ T439] ? __pfx_unregister_netdevice_queue (net/core/dev.c:11500) [ 29.247140][ T439] ? net_generic (./include/net/netns/generic.h:51) [ 29.247373][ T439] rtnl_dellink (net/core/rtnetlink.c:3487 net/core/rtnetlink.c:3527) [ 29.247603][ T439] ? __pfx_rtnl_dellink (net/core/rtnetlink.c:3493) [ 29.247857][ T439] ? find_held_lock (kernel/locking/lockdep.c:5339) [ 29.248099][ T439] ? __lock_release (kernel/locking/lockdep.c:5525) [ 29.248333][ T439] ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/core/rtnetlink.c:6909) [ 29.248567][ T439] ? __pfx___lock_release (kernel/locking/lockdep.c:5501) [ 29.248800][ T439] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814) [ 29.249036][ T439] ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/core/rtnetlink.c:6909) [ 29.249265][ T439] ? __pfx_rtnl_dellink (net/core/rtnetlink.c:3493) [ 29.249493][ T439] rtnetlink_rcv_msg (net/core/rtnetlink.c:6911) [ 29.249730][ T439] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6814) [ 29.249956][ T439] ? 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) [ 29.250186][ T439] ? mark_lock (kernel/locking/lockdep.c:4727 (discriminator 3)) [ 29.250360][ T439] ? __lock_acquire (kernel/locking/lockdep.c:5226) [ 29.250587][ T439] netlink_rcv_skb (net/netlink/af_netlink.c:2543) [ 29.250814][ T439] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6814) [ 29.251029][ T439] ? __pfx_netlink_rcv_skb (net/netlink/af_netlink.c:2520) [ 29.251268][ T439] ? netlink_deliver_tap (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/netlink/af_netlink.c:340) [ 29.251502][ T439] ? 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) [ 29.251737][ T439] netlink_unicast (net/netlink/af_netlink.c:1322 net/netlink/af_netlink.c:1348) [ 29.251980][ T439] ? __pfx_netlink_unicast (net/netlink/af_netlink.c:1333) [ 29.252219][ T439] ? find_held_lock (kernel/locking/lockdep.c:5339) [ 29.252458][ T439] netlink_sendmsg (net/netlink/af_netlink.c:1892) [ 29.252687][ T439] ? __pfx_netlink_sendmsg (net/netlink/af_netlink.c:1811) [ 29.252928][ T439] ____sys_sendmsg (net/socket.c:711 net/socket.c:726 net/socket.c:2594) [ 29.253164][ T439] ? __pfx_____sys_sendmsg (net/socket.c:2540) [ 29.253394][ T439] ? __pfx_copy_msghdr_from_user (net/socket.c:2520) [ 29.253687][ T439] ___sys_sendmsg (net/socket.c:2650) [ 29.253867][ T439] ? __pfx____sys_sendmsg (net/socket.c:2637) [ 29.254015][ T439] ? kasan_save_stack (mm/kasan/common.c:49) [ 29.254164][ T439] ? kasan_save_stack (mm/kasan/common.c:48) [ 29.254366][ T439] ? __kasan_record_aux_stack (mm/kasan/generic.c:544) [ 29.254534][ T439] ? __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) [ 29.254732][ T439] ? __x64_sys_close (fs/open.c:1557 fs/open.c:1539 fs/open.c:1539) [ 29.254927][ T439] ? do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) [ 29.255090][ T439] ? entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) [ 29.255284][ T439] ? __lock_acquire (kernel/locking/lockdep.c:5226) [ 29.255476][ T439] ? find_held_lock (kernel/locking/lockdep.c:5339) [ 29.255642][ T439] ? __lock_release (kernel/locking/lockdep.c:5525) [ 29.255795][ T439] ? __virt_addr_valid (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:962 ./include/linux/mmzone.h:2058 arch/x86/mm/physaddr.c:65) [ 29.255942][ T439] ? __pfx___lock_release (kernel/locking/lockdep.c:5501) [ 29.256087][ T439] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814) [ 29.256235][ T439] __sys_sendmsg (net/socket.c:2680) [ 29.256384][ T439] ? __pfx___sys_sendmsg (net/socket.c:2665) [ 29.256529][ T439] ? __pfx_slab_free_after_rcu_debug (mm/slub.c:4643) [ 29.256729][ T439] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) [ 29.256881][ T439] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) [ 29.257063][ T439] RIP: 0033:0x7fd35951a9a7 [ 29.257216][ T439] 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) [ 29.257792][ T439] RSP: 002b:00007fff535fc4a8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e [ 29.258018][ T439] RAX: ffffffffffffffda RBX: 00007fff535fcbd0 RCX: 00007fd35951a9a7 [ 29.258268][ T439] RDX: 0000000000000000 RSI: 00007fff535fc510 RDI: 0000000000000005 [ 29.258512][ T439] RBP: 0000000000000002 R08: 0000000000000003 R09: 0000000000000078 [ 29.258745][ T439] R10: 00007fd3593d8ef8 R11: 0000000000000246 R12: 0000000000000002 Finger prints: print_deadlock_bug:validate_chain:__lock_acquire:down_read:blocking_notifier_call_chain