====================================== | [ 61.741617][ T798] #0: ffffffff8dbe7a48 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_dellink (net/core/rtnetlink.c:3521) | [ 61.741914][ T798] #1: ffffffff8dbd6630 ((netdev_chain).rwsem){++++}-{4:4}, at: blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368) | [ 61.742223][ T798] | [ 61.742223][ T798] stack backtrace: [ 61.742634][ T798] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 61.742825][ T798] Call Trace: [ 61.742936][ T798] [ 61.743013][ T798] dump_stack_lvl (lib/dump_stack.c:123) [ 61.743166][ T798] print_deadlock_bug (kernel/locking/lockdep.c:3040) [ 61.743314][ T798] validate_chain (kernel/locking/lockdep.c:3894) [ 61.743477][ T798] ? __pfx_validate_chain (kernel/locking/lockdep.c:3860) [ 61.743626][ T798] ? 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) [ 61.743776][ T798] ? mark_lock (kernel/locking/lockdep.c:4727 (discriminator 3)) [ 61.743889][ T798] __lock_acquire (kernel/locking/lockdep.c:5226) [ 61.744051][ T798] lock_acquire.part.0 (kernel/locking/lockdep.c:467 kernel/locking/lockdep.c:5851) [ 61.744195][ T798] ? blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368) [ 61.744381][ T798] ? netconsole_process_cleanups_core (drivers/net/netconsole.c:242 (discriminator 11)) [ 61.744589][ T798] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814) [ 61.744736][ T798] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 37)) [ 61.744892][ T798] ? lock_acquire (kernel/locking/lockdep.c:5822) [ 61.745038][ T798] ? blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368) [ 61.745225][ T798] down_read (./arch/x86/include/asm/preempt.h:79 kernel/locking/rwsem.c:1246 kernel/locking/rwsem.c:1261 kernel/locking/rwsem.c:1526) [ 61.745358][ T798] ? blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368) [ 61.745536][ T798] ? __pfx_down_read (kernel/locking/rwsem.c:1522) [ 61.745698][ T798] ? __lock_release (kernel/locking/lockdep.c:5525) [ 61.745849][ T798] ? netconsole_netdev_event (drivers/net/netconsole.c:1082) [ 61.745998][ T798] ? __pfx___lock_release (kernel/locking/lockdep.c:5501) [ 61.746145][ T798] blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368) [ 61.746318][ T798] __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)) [ 61.746467][ T798] ? __pfx___netdev_upper_dev_unlink (net/core/dev.c:8151) [ 61.746648][ T798] ? __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) [ 61.746794][ T798] ? __pfx___mutex_unlock_slowpath (kernel/locking/mutex.c:890) [ 61.746998][ T798] ? rtnl_is_locked (net/core/rtnetlink.c:163) [ 61.747147][ T798] netdev_upper_dev_unlink (net/core/dev.c:8190) [ 61.747301][ T798] ? __pfx_netdev_upper_dev_unlink (net/core/dev.c:8190) [ 61.747482][ T798] ? netconsole_netdev_event (drivers/net/netconsole.c:1082) [ 61.747628][ T798] ? 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) [ 61.747794][ T798] ? rtnl_is_locked (net/core/rtnetlink.c:163) [ 61.747938][ T798] ? netdev_master_upper_dev_get (net/core/dev.c:7230) [ 61.748170][ T798] vrf_device_event (drivers/net/vrf.c:1110 drivers/net/vrf.c:1119 drivers/net/vrf.c:1804) vrf [ 61.748334][ T798] notifier_call_chain (kernel/notifier.c:85 (discriminator 2)) [ 61.748499][ T798] blocking_notifier_call_chain (kernel/notifier.c:381 kernel/notifier.c:368) [ 61.748661][ T798] unregister_netdevice_many_notify (net/core/dev.c:11575) [ 61.748877][ T798] ? find_held_lock (kernel/locking/lockdep.c:5339) [ 61.749042][ T798] ? __pfx_unregister_netdevice_many_notify (net/core/dev.c:11516) [ 61.749259][ T798] ? __pfx___lock_release (kernel/locking/lockdep.c:5501) [ 61.749434][ T798] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814) [ 61.749595][ T798] ? rtnl_is_locked (net/core/rtnetlink.c:163) [ 61.749762][ T798] ? unregister_netdevice_queue (net/core/dev.c:11501) [ 61.749983][ T798] ? __pfx_unregister_netdevice_queue (net/core/dev.c:11500) [ 61.750183][ T798] ? net_generic (./include/net/netns/generic.h:51) [ 61.750358][ T798] rtnl_dellink (net/core/rtnetlink.c:3487 net/core/rtnetlink.c:3527) [ 61.750530][ T798] ? __pfx_rtnl_dellink (net/core/rtnetlink.c:3493) [ 61.750707][ T798] ? find_held_lock (kernel/locking/lockdep.c:5339) [ 61.750870][ T798] ? __lock_release (kernel/locking/lockdep.c:5525) [ 61.751064][ T798] ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/core/rtnetlink.c:6909) [ 61.751227][ T798] ? __pfx___lock_release (kernel/locking/lockdep.c:5501) [ 61.751388][ T798] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814) [ 61.751551][ T798] ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/core/rtnetlink.c:6909) [ 61.751731][ T798] ? __pfx_rtnl_dellink (net/core/rtnetlink.c:3493) [ 61.751894][ T798] rtnetlink_rcv_msg (net/core/rtnetlink.c:6911) [ 61.752059][ T798] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6814) [ 61.752234][ T798] ? 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) [ 61.752407][ T798] ? mark_lock (kernel/locking/lockdep.c:4727 (discriminator 3)) [ 61.752528][ T798] ? __lock_acquire (kernel/locking/lockdep.c:5226) [ 61.752698][ T798] netlink_rcv_skb (net/netlink/af_netlink.c:2543) [ 61.752864][ T798] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6814) [ 61.753026][ T798] ? __pfx_netlink_rcv_skb (net/netlink/af_netlink.c:2520) [ 61.753190][ T798] ? netlink_deliver_tap (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/netlink/af_netlink.c:340) [ 61.753360][ T798] ? 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) [ 61.753522][ T798] netlink_unicast (net/netlink/af_netlink.c:1322 net/netlink/af_netlink.c:1348) [ 61.753681][ T798] ? __pfx_netlink_unicast (net/netlink/af_netlink.c:1333) [ 61.753840][ T798] ? find_held_lock (kernel/locking/lockdep.c:5339) [ 61.754004][ T798] netlink_sendmsg (net/netlink/af_netlink.c:1892) [ 61.754169][ T798] ? __pfx_netlink_sendmsg (net/netlink/af_netlink.c:1811) [ 61.754332][ T798] ____sys_sendmsg (net/socket.c:711 net/socket.c:726 net/socket.c:2594) [ 61.754497][ T798] ? __pfx_____sys_sendmsg (net/socket.c:2540) [ 61.754663][ T798] ? __pfx_copy_msghdr_from_user (net/socket.c:2520) [ 61.754869][ T798] ___sys_sendmsg (net/socket.c:2650) [ 61.755029][ T798] ? __pfx____sys_sendmsg (net/socket.c:2637) [ 61.755192][ T798] ? kasan_save_stack (mm/kasan/common.c:49) [ 61.755360][ T798] ? kasan_save_stack (mm/kasan/common.c:48) [ 61.755521][ T798] ? __kasan_record_aux_stack (mm/kasan/generic.c:544) [ 61.755705][ T798] ? __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) [ 61.755915][ T798] ? __x64_sys_close (fs/open.c:1557 fs/open.c:1539 fs/open.c:1539) [ 61.756077][ T798] ? do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) [ 61.756258][ T798] ? entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) [ 61.756461][ T798] ? __lock_acquire (kernel/locking/lockdep.c:5226) [ 61.756625][ T798] ? find_held_lock (kernel/locking/lockdep.c:5339) [ 61.756808][ T798] ? __lock_release (kernel/locking/lockdep.c:5525) [ 61.756967][ T798] ? __virt_addr_valid (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:962 ./include/linux/mmzone.h:2058 arch/x86/mm/physaddr.c:65) [ 61.757138][ T798] ? __pfx___lock_release (kernel/locking/lockdep.c:5501) [ 61.757298][ T798] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814) [ 61.757459][ T798] __sys_sendmsg (net/socket.c:2680) [ 61.757623][ T798] ? __pfx___sys_sendmsg (net/socket.c:2665) [ 61.757785][ T798] ? __pfx_slab_free_after_rcu_debug (mm/slub.c:4643) [ 61.757989][ T798] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) [ 61.758152][ T798] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) [ 61.758355][ T798] RIP: 0033:0x7fa3a605e9a7 [ 61.758524][ T798] 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) [ 61.759081][ T798] RSP: 002b:00007ffde14e1ce8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e [ 61.759352][ T798] RAX: ffffffffffffffda RBX: 00007ffde14e2410 RCX: 00007fa3a605e9a7 [ 61.759590][ T798] RDX: 0000000000000000 RSI: 00007ffde14e1d50 RDI: 0000000000000005 [ 61.759827][ T798] RBP: 0000000000000002 R08: 0000000000000003 R09: 0000000000000078 [ 61.760064][ T798] R10: 00007fa3a5f1cef8 R11: 0000000000000246 R12: 0000000000000002 Finger prints: print_deadlock_bug:validate_chain:__lock_acquire:down_read:blocking_notifier_call_chain