====================================== | [ 58.193015][ T556] #0: ffffffffa81e7a48 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_dellink (net/core/rtnetlink.c:3521) | [ 58.193285][ T556] #1: ffffffffa81d6630 ((netdev_chain).rwsem){++++}-{4:4}, at: blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368) | [ 58.193587][ T556] | [ 58.193587][ T556] stack backtrace: [ 58.193992][ T556] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 58.194176][ T556] Call Trace: [ 58.194290][ T556] [ 58.194368][ T556] dump_stack_lvl (lib/dump_stack.c:123) [ 58.194528][ T556] print_deadlock_bug (kernel/locking/lockdep.c:3040) [ 58.194677][ T556] validate_chain (kernel/locking/lockdep.c:3894) [ 58.194826][ T556] ? __pfx_validate_chain (kernel/locking/lockdep.c:3860) [ 58.194978][ T556] ? 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) [ 58.195127][ T556] ? mark_lock (kernel/locking/lockdep.c:4727 (discriminator 3)) [ 58.195240][ T556] __lock_acquire (kernel/locking/lockdep.c:5226) [ 58.195392][ T556] lock_acquire.part.0 (kernel/locking/lockdep.c:467 kernel/locking/lockdep.c:5851) [ 58.195538][ T556] ? blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368) [ 58.195729][ T556] ? netconsole_process_cleanups_core (drivers/net/netconsole.c:242 (discriminator 11)) [ 58.195915][ T556] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814) [ 58.196064][ T556] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 37)) [ 58.196214][ T556] ? lock_acquire (kernel/locking/lockdep.c:5822) [ 58.196363][ T556] ? blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368) [ 58.196548][ T556] down_read (./arch/x86/include/asm/preempt.h:79 kernel/locking/rwsem.c:1246 kernel/locking/rwsem.c:1261 kernel/locking/rwsem.c:1526) [ 58.196660][ T556] ? blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368) [ 58.196848][ T556] ? __pfx_down_read (kernel/locking/rwsem.c:1522) [ 58.196995][ T556] ? __lock_release (kernel/locking/lockdep.c:5525) [ 58.197143][ T556] ? netconsole_netdev_event (drivers/net/netconsole.c:1082) [ 58.197293][ T556] ? __pfx___lock_release (kernel/locking/lockdep.c:5501) [ 58.197444][ T556] blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368) [ 58.197592][ T556] __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)) [ 58.197744][ T556] ? __pfx___netdev_upper_dev_unlink (net/core/dev.c:8151) [ 58.197928][ T556] ? __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) [ 58.198077][ T556] ? __pfx___mutex_unlock_slowpath (kernel/locking/mutex.c:890) [ 58.198262][ T556] ? rtnl_is_locked (net/core/rtnetlink.c:163) [ 58.198413][ T556] netdev_upper_dev_unlink (net/core/dev.c:8190) [ 58.198560][ T556] ? __pfx_netdev_upper_dev_unlink (net/core/dev.c:8190) [ 58.198744][ T556] ? netconsole_netdev_event (drivers/net/netconsole.c:1082) [ 58.198898][ T556] ? 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) [ 58.199047][ T556] ? rtnl_is_locked (net/core/rtnetlink.c:163) [ 58.199195][ T556] ? netdev_master_upper_dev_get (net/core/dev.c:7230) [ 58.199381][ T556] vrf_device_event (drivers/net/vrf.c:1110 drivers/net/vrf.c:1119 drivers/net/vrf.c:1804) vrf [ 58.199533][ T556] notifier_call_chain (kernel/notifier.c:85 (discriminator 2)) [ 58.199682][ T556] blocking_notifier_call_chain (kernel/notifier.c:381 kernel/notifier.c:368) [ 58.199841][ T556] unregister_netdevice_many_notify (net/core/dev.c:11575) [ 58.200036][ T556] ? __lock_release (kernel/locking/lockdep.c:5525) [ 58.200183][ T556] ? __pfx___lock_release (kernel/locking/lockdep.c:5501) [ 58.200331][ T556] ? __pfx_unregister_netdevice_many_notify (net/core/dev.c:11516) [ 58.200516][ T556] ? 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) [ 58.200664][ T556] ? mark_held_locks (kernel/locking/lockdep.c:4321) [ 58.200812][ T556] ? __pfx_vlan_info_rcu_free (net/8021q/vlan_core.c:145) [ 58.200961][ T556] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4347 kernel/locking/lockdep.c:4406) [ 58.201153][ T556] rtnl_dellink (net/core/rtnetlink.c:3487 net/core/rtnetlink.c:3527) [ 58.201302][ T556] ? __pfx_rtnl_dellink (net/core/rtnetlink.c:3493) [ 58.201465][ T556] ? find_held_lock (kernel/locking/lockdep.c:5339) [ 58.201616][ T556] ? __lock_release (kernel/locking/lockdep.c:5525) [ 58.201763][ T556] ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/core/rtnetlink.c:6909) [ 58.201911][ T556] ? __pfx___lock_release (kernel/locking/lockdep.c:5501) [ 58.202060][ T556] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814) [ 58.202216][ T556] ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/core/rtnetlink.c:6909) [ 58.202364][ T556] ? __pfx_rtnl_dellink (net/core/rtnetlink.c:3493) [ 58.202512][ T556] rtnetlink_rcv_msg (net/core/rtnetlink.c:6911) [ 58.202662][ T556] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6814) [ 58.202809][ T556] ? 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) [ 58.202954][ T556] ? mark_lock (kernel/locking/lockdep.c:4727 (discriminator 3)) [ 58.203067][ T556] ? __lock_acquire (kernel/locking/lockdep.c:5226) [ 58.203221][ T556] netlink_rcv_skb (net/netlink/af_netlink.c:2543) [ 58.203370][ T556] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6814) [ 58.203521][ T556] ? __pfx_netlink_rcv_skb (net/netlink/af_netlink.c:2520) [ 58.203673][ T556] ? netlink_deliver_tap (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/netlink/af_netlink.c:340) [ 58.203824][ T556] ? 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) [ 58.203973][ T556] netlink_unicast (net/netlink/af_netlink.c:1322 net/netlink/af_netlink.c:1348) [ 58.204122][ T556] ? __pfx_netlink_unicast (net/netlink/af_netlink.c:1333) [ 58.204275][ T556] ? find_held_lock (kernel/locking/lockdep.c:5339) [ 58.204425][ T556] netlink_sendmsg (net/netlink/af_netlink.c:1892) [ 58.204574][ T556] ? __pfx_netlink_sendmsg (net/netlink/af_netlink.c:1811) [ 58.204725][ T556] ____sys_sendmsg (net/socket.c:711 net/socket.c:726 net/socket.c:2594) [ 58.204873][ T556] ? __pfx_____sys_sendmsg (net/socket.c:2540) [ 58.205020][ T556] ? __pfx_copy_msghdr_from_user (net/socket.c:2520) [ 58.205209][ T556] ___sys_sendmsg (net/socket.c:2650) [ 58.205363][ T556] ? __pfx____sys_sendmsg (net/socket.c:2637) [ 58.205512][ T556] ? kasan_save_stack (mm/kasan/common.c:49) [ 58.205661][ T556] ? kasan_save_stack (mm/kasan/common.c:48) [ 58.205808][ T556] ? __kasan_record_aux_stack (mm/kasan/generic.c:544) [ 58.205956][ T556] ? __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) [ 58.206139][ T556] ? __x64_sys_close (fs/open.c:1557 fs/open.c:1539 fs/open.c:1539) [ 58.206288][ T556] ? do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) [ 58.206436][ T556] ? entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) [ 58.206625][ T556] ? __lock_acquire (kernel/locking/lockdep.c:5226) [ 58.206774][ T556] ? find_held_lock (kernel/locking/lockdep.c:5339) [ 58.206922][ T556] ? __lock_release (kernel/locking/lockdep.c:5525) [ 58.207070][ T556] ? __virt_addr_valid (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:962 ./include/linux/mmzone.h:2058 arch/x86/mm/physaddr.c:65) [ 58.207219][ T556] ? __pfx___lock_release (kernel/locking/lockdep.c:5501) [ 58.207366][ T556] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814) [ 58.207516][ T556] __sys_sendmsg (net/socket.c:2680) [ 58.207670][ T556] ? __pfx___sys_sendmsg (net/socket.c:2665) [ 58.207817][ T556] ? __pfx_slab_free_after_rcu_debug (mm/slub.c:4643) [ 58.208008][ T556] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) [ 58.208156][ T556] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) [ 58.208338][ T556] RIP: 0033:0x7fd6a94b99a7 [ 58.208493][ T556] 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) [ 58.209013][ T556] RSP: 002b:00007ffd5b896e58 EFLAGS: 00000246 ORIG_RAX: 000000000000002e [ 58.209235][ T556] RAX: ffffffffffffffda RBX: 00007ffd5b897580 RCX: 00007fd6a94b99a7 [ 58.209458][ T556] RDX: 0000000000000000 RSI: 00007ffd5b896ec0 RDI: 0000000000000005 [ 58.209682][ T556] RBP: 0000000000000002 R08: 0000000000000003 R09: 0000000000000078 [ 58.209925][ T556] R10: 00007fd6a9377ef8 R11: 0000000000000246 R12: 0000000000000002 Finger prints: print_deadlock_bug:validate_chain:__lock_acquire:down_read:blocking_notifier_call_chain