====================================== | [ 661.055678][ T5333] #0: ffffffffab7e7a48 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_dellink (net/core/rtnetlink.c:3521) | [ 661.055942][ T5333] #1: ffffffffab7d6630 ((netdev_chain).rwsem){++++}-{4:4}, at: blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368) | [ 661.056251][ T5333] | [ 661.056251][ T5333] stack backtrace: [ 661.056661][ T5333] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 661.056843][ T5333] Call Trace: [ 661.056955][ T5333] [ 661.057042][ T5333] dump_stack_lvl (lib/dump_stack.c:123) [ 661.057199][ T5333] print_deadlock_bug (kernel/locking/lockdep.c:3040) [ 661.057356][ T5333] validate_chain (kernel/locking/lockdep.c:3894) [ 661.057511][ T5333] ? __pfx_validate_chain (kernel/locking/lockdep.c:3860) [ 661.057664][ T5333] ? 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) [ 661.057822][ T5333] ? mark_lock (kernel/locking/lockdep.c:4727 (discriminator 3)) [ 661.057972][ T5333] __lock_acquire (kernel/locking/lockdep.c:5226) [ 661.058135][ T5333] lock_acquire.part.0 (kernel/locking/lockdep.c:467 kernel/locking/lockdep.c:5851) [ 661.058294][ T5333] ? blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368) [ 661.058502][ T5333] ? netconsole_process_cleanups_core (drivers/net/netconsole.c:242 (discriminator 11)) [ 661.058696][ T5333] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814) [ 661.058850][ T5333] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 37)) [ 661.059015][ T5333] ? lock_acquire (kernel/locking/lockdep.c:5822) [ 661.059171][ T5333] ? blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368) [ 661.059363][ T5333] down_read (./arch/x86/include/asm/preempt.h:79 kernel/locking/rwsem.c:1246 kernel/locking/rwsem.c:1261 kernel/locking/rwsem.c:1526) [ 661.059483][ T5333] ? blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368) [ 661.059680][ T5333] ? __pfx_down_read (kernel/locking/rwsem.c:1522) [ 661.059825][ T5333] ? __lock_release (kernel/locking/lockdep.c:5525) [ 661.059972][ T5333] ? netconsole_netdev_event (drivers/net/netconsole.c:1082) [ 661.060124][ T5333] ? __pfx___lock_release (kernel/locking/lockdep.c:5501) [ 661.060274][ T5333] blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368) [ 661.060424][ T5333] __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)) [ 661.060574][ T5333] ? __pfx___netdev_upper_dev_unlink (net/core/dev.c:8151) [ 661.060770][ T5333] ? __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) [ 661.060923][ T5333] ? __pfx___mutex_unlock_slowpath (kernel/locking/mutex.c:890) [ 661.061113][ T5333] ? rtnl_is_locked (net/core/rtnetlink.c:163) [ 661.061272][ T5333] netdev_upper_dev_unlink (net/core/dev.c:8190) [ 661.061421][ T5333] ? __pfx_netdev_upper_dev_unlink (net/core/dev.c:8190) [ 661.061624][ T5333] ? netconsole_netdev_event (drivers/net/netconsole.c:1082) [ 661.061781][ T5333] ? 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) [ 661.061929][ T5333] ? rtnl_is_locked (net/core/rtnetlink.c:163) [ 661.062089][ T5333] ? netdev_master_upper_dev_get (net/core/dev.c:7230) [ 661.062271][ T5333] vrf_device_event (drivers/net/vrf.c:1110 drivers/net/vrf.c:1119 drivers/net/vrf.c:1804) vrf [ 661.062443][ T5333] notifier_call_chain (kernel/notifier.c:85 (discriminator 2)) [ 661.062593][ T5333] blocking_notifier_call_chain (kernel/notifier.c:381 kernel/notifier.c:368) [ 661.062743][ T5333] unregister_netdevice_many_notify (net/core/dev.c:11575) [ 661.062924][ T5333] ? __lock_release (kernel/locking/lockdep.c:5525) [ 661.063071][ T5333] ? __pfx___lock_release (kernel/locking/lockdep.c:5501) [ 661.063219][ T5333] ? __pfx_unregister_netdevice_many_notify (net/core/dev.c:11516) [ 661.063423][ T5333] ? 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) [ 661.063583][ T5333] ? mark_held_locks (kernel/locking/lockdep.c:4321) [ 661.063743][ T5333] ? __pfx_vlan_info_rcu_free (net/8021q/vlan_core.c:145) [ 661.063894][ T5333] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4347 kernel/locking/lockdep.c:4406) [ 661.064078][ T5333] rtnl_dellink (net/core/rtnetlink.c:3487 net/core/rtnetlink.c:3527) [ 661.064241][ T5333] ? __pfx_rtnl_dellink (net/core/rtnetlink.c:3493) [ 661.064409][ T5333] ? find_held_lock (kernel/locking/lockdep.c:5339) [ 661.064558][ T5333] ? __lock_release (kernel/locking/lockdep.c:5525) [ 661.064711][ T5333] ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/core/rtnetlink.c:6909) [ 661.064870][ T5333] ? __pfx___lock_release (kernel/locking/lockdep.c:5501) [ 661.065026][ T5333] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814) [ 661.065180][ T5333] ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/core/rtnetlink.c:6909) [ 661.065330][ T5333] ? __pfx_rtnl_dellink (net/core/rtnetlink.c:3493) [ 661.065482][ T5333] rtnetlink_rcv_msg (net/core/rtnetlink.c:6911) [ 661.065640][ T5333] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6814) [ 661.065792][ T5333] ? 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) [ 661.065947][ T5333] ? mark_lock (kernel/locking/lockdep.c:4727 (discriminator 3)) [ 661.066063][ T5333] ? __lock_acquire (kernel/locking/lockdep.c:5226) [ 661.066210][ T5333] netlink_rcv_skb (net/netlink/af_netlink.c:2543) [ 661.066365][ T5333] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6814) [ 661.066527][ T5333] ? __pfx_netlink_rcv_skb (net/netlink/af_netlink.c:2520) [ 661.066679][ T5333] ? netlink_deliver_tap (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/netlink/af_netlink.c:340) [ 661.066834][ T5333] ? 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) [ 661.066983][ T5333] netlink_unicast (net/netlink/af_netlink.c:1322 net/netlink/af_netlink.c:1348) [ 661.067136][ T5333] ? __pfx_netlink_unicast (net/netlink/af_netlink.c:1333) [ 661.067289][ T5333] ? find_held_lock (kernel/locking/lockdep.c:5339) [ 661.067450][ T5333] netlink_sendmsg (net/netlink/af_netlink.c:1892) [ 661.067598][ T5333] ? __pfx_netlink_sendmsg (net/netlink/af_netlink.c:1811) [ 661.067748][ T5333] ____sys_sendmsg (net/socket.c:711 net/socket.c:726 net/socket.c:2594) [ 661.067905][ T5333] ? __pfx_____sys_sendmsg (net/socket.c:2540) [ 661.068050][ T5333] ? __pfx_copy_msghdr_from_user (net/socket.c:2520) [ 661.068237][ T5333] ___sys_sendmsg (net/socket.c:2650) [ 661.068398][ T5333] ? __pfx____sys_sendmsg (net/socket.c:2637) [ 661.068549][ T5333] ? kasan_save_stack (mm/kasan/common.c:49) [ 661.068696][ T5333] ? kasan_save_stack (mm/kasan/common.c:48) [ 661.068842][ T5333] ? __kasan_record_aux_stack (mm/kasan/generic.c:544) [ 661.068995][ T5333] ? __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) [ 661.069180][ T5333] ? __x64_sys_close (fs/open.c:1557 fs/open.c:1539 fs/open.c:1539) [ 661.069339][ T5333] ? do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) [ 661.069490][ T5333] ? entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) [ 661.069686][ T5333] ? __lock_acquire (kernel/locking/lockdep.c:5226) [ 661.069834][ T5333] ? find_held_lock (kernel/locking/lockdep.c:5339) [ 661.069981][ T5333] ? __lock_release (kernel/locking/lockdep.c:5525) [ 661.070134][ T5333] ? __virt_addr_valid (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:962 ./include/linux/mmzone.h:2058 arch/x86/mm/physaddr.c:65) [ 661.070298][ T5333] ? __pfx___lock_release (kernel/locking/lockdep.c:5501) [ 661.070452][ T5333] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814) [ 661.070615][ T5333] __sys_sendmsg (net/socket.c:2680) [ 661.070767][ T5333] ? __pfx___sys_sendmsg (net/socket.c:2665) [ 661.070915][ T5333] ? __pfx_slab_free_after_rcu_debug (mm/slub.c:4643) [ 661.071117][ T5333] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) [ 661.071272][ T5333] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) [ 661.071467][ T5333] RIP: 0033:0x7fe4478389a7 [ 661.071626][ T5333] 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) [ 661.072140][ T5333] RSP: 002b:00007fff782cf778 EFLAGS: 00000246 ORIG_RAX: 000000000000002e [ 661.072366][ T5333] RAX: ffffffffffffffda RBX: 00007fff782cfea0 RCX: 00007fe4478389a7 [ 661.072591][ T5333] RDX: 0000000000000000 RSI: 00007fff782cf7e0 RDI: 0000000000000005 [ 661.072811][ T5333] RBP: 0000000000000002 R08: 0000000000000003 R09: 0000000000000078 [ 661.073033][ T5333] R10: 00007fe4476f6ef8 R11: 0000000000000246 R12: 0000000000000002 Finger prints: print_deadlock_bug:validate_chain:__lock_acquire:down_read:blocking_notifier_call_chain