====================================== | [ 29.752126][ T442] #0: ffffffffb4be7a48 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_dellink (net/core/rtnetlink.c:3521) | [ 29.752393][ T442] #1: ffffffffb4bd6630 ((netdev_chain).rwsem){++++}-{4:4}, at: blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368) | [ 29.752698][ T442] | [ 29.752698][ T442] stack backtrace: [ 29.753108][ T442] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 29.753291][ T442] Call Trace: [ 29.753403][ T442] [ 29.753500][ T442] dump_stack_lvl (lib/dump_stack.c:123) [ 29.753650][ T442] print_deadlock_bug (kernel/locking/lockdep.c:3040) [ 29.753815][ T442] validate_chain (kernel/locking/lockdep.c:3894) [ 29.753963][ T442] ? __pfx_validate_chain (kernel/locking/lockdep.c:3860) [ 29.754110][ T442] ? 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) [ 29.754260][ T442] ? mark_lock (kernel/locking/lockdep.c:4727 (discriminator 3)) [ 29.754375][ T442] __lock_acquire (kernel/locking/lockdep.c:5226) [ 29.754523][ T442] lock_acquire.part.0 (kernel/locking/lockdep.c:467 kernel/locking/lockdep.c:5851) [ 29.754668][ T442] ? blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368) [ 29.754854][ T442] ? netconsole_process_cleanups_core (drivers/net/netconsole.c:242 (discriminator 11)) [ 29.755040][ T442] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814) [ 29.755188][ T442] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 37)) [ 29.755340][ T442] ? lock_acquire (kernel/locking/lockdep.c:5822) [ 29.755487][ T442] ? blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368) [ 29.755671][ T442] down_read (./arch/x86/include/asm/preempt.h:79 kernel/locking/rwsem.c:1246 kernel/locking/rwsem.c:1261 kernel/locking/rwsem.c:1526) [ 29.755784][ T442] ? blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368) [ 29.755965][ T442] ? __pfx_down_read (kernel/locking/rwsem.c:1522) [ 29.756110][ T442] ? __lock_release (kernel/locking/lockdep.c:5525) [ 29.756256][ T442] ? netconsole_netdev_event (drivers/net/netconsole.c:1082) [ 29.756409][ T442] ? __pfx___lock_release (kernel/locking/lockdep.c:5501) [ 29.756557][ T442] blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368) [ 29.756705][ T442] __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)) [ 29.756856][ T442] ? __pfx___netdev_upper_dev_unlink (net/core/dev.c:8151) [ 29.757037][ T442] ? __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) [ 29.757184][ T442] ? __pfx___mutex_unlock_slowpath (kernel/locking/mutex.c:890) [ 29.757374][ T442] ? rtnl_is_locked (net/core/rtnetlink.c:163) [ 29.757522][ T442] netdev_upper_dev_unlink (net/core/dev.c:8190) [ 29.757667][ T442] ? __pfx_netdev_upper_dev_unlink (net/core/dev.c:8190) [ 29.757859][ T442] ? netconsole_netdev_event (drivers/net/netconsole.c:1082) [ 29.758006][ T442] ? 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) [ 29.758153][ T442] ? rtnl_is_locked (net/core/rtnetlink.c:163) [ 29.758297][ T442] ? netdev_master_upper_dev_get (net/core/dev.c:7230) [ 29.758486][ T442] vrf_device_event (drivers/net/vrf.c:1110 drivers/net/vrf.c:1119 drivers/net/vrf.c:1804) vrf [ 29.758649][ T442] notifier_call_chain (kernel/notifier.c:85 (discriminator 2)) [ 29.758803][ T442] blocking_notifier_call_chain (kernel/notifier.c:381 kernel/notifier.c:368) [ 29.758949][ T442] unregister_netdevice_many_notify (net/core/dev.c:11575) [ 29.759134][ T442] ? find_held_lock (kernel/locking/lockdep.c:5339) [ 29.759285][ T442] ? __pfx_unregister_netdevice_many_notify (net/core/dev.c:11516) [ 29.759465][ T442] ? __pfx___lock_release (kernel/locking/lockdep.c:5501) [ 29.759618][ T442] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814) [ 29.759770][ T442] ? rtnl_is_locked (net/core/rtnetlink.c:163) [ 29.759915][ T442] ? unregister_netdevice_queue (net/core/dev.c:11501) [ 29.760097][ T442] ? __pfx_unregister_netdevice_queue (net/core/dev.c:11500) [ 29.760279][ T442] ? net_generic (./include/net/netns/generic.h:51) [ 29.760428][ T442] rtnl_dellink (net/core/rtnetlink.c:3487 net/core/rtnetlink.c:3527) [ 29.760576][ T442] ? __pfx_rtnl_dellink (net/core/rtnetlink.c:3493) [ 29.760750][ T442] ? find_held_lock (kernel/locking/lockdep.c:5339) [ 29.760908][ T442] ? __lock_release (kernel/locking/lockdep.c:5525) [ 29.761056][ T442] ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/core/rtnetlink.c:6909) [ 29.761241][ T442] ? __pfx___lock_release (kernel/locking/lockdep.c:5501) [ 29.761406][ T442] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814) [ 29.761568][ T442] ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/core/rtnetlink.c:6909) [ 29.761729][ T442] ? __pfx_rtnl_dellink (net/core/rtnetlink.c:3493) [ 29.761894][ T442] rtnetlink_rcv_msg (net/core/rtnetlink.c:6911) [ 29.762068][ T442] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6814) [ 29.762229][ T442] ? 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) [ 29.762389][ T442] ? mark_lock (kernel/locking/lockdep.c:4727 (discriminator 3)) [ 29.762513][ T442] ? __lock_acquire (kernel/locking/lockdep.c:5226) [ 29.762674][ T442] netlink_rcv_skb (net/netlink/af_netlink.c:2543) [ 29.762838][ T442] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6814) [ 29.762999][ T442] ? __pfx_netlink_rcv_skb (net/netlink/af_netlink.c:2520) [ 29.763170][ T442] ? netlink_deliver_tap (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/netlink/af_netlink.c:340) [ 29.763334][ T442] ? 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) [ 29.763498][ T442] netlink_unicast (net/netlink/af_netlink.c:1322 net/netlink/af_netlink.c:1348) [ 29.763660][ T442] ? __pfx_netlink_unicast (net/netlink/af_netlink.c:1333) [ 29.763821][ T442] ? find_held_lock (kernel/locking/lockdep.c:5339) [ 29.763984][ T442] netlink_sendmsg (net/netlink/af_netlink.c:1892) [ 29.764148][ T442] ? __pfx_netlink_sendmsg (net/netlink/af_netlink.c:1811) [ 29.764318][ T442] ____sys_sendmsg (net/socket.c:711 net/socket.c:726 net/socket.c:2594) [ 29.764479][ T442] ? __pfx_____sys_sendmsg (net/socket.c:2540) [ 29.764637][ T442] ? __pfx_copy_msghdr_from_user (net/socket.c:2520) [ 29.764843][ T442] ___sys_sendmsg (net/socket.c:2650) [ 29.765004][ T442] ? __pfx____sys_sendmsg (net/socket.c:2637) [ 29.765168][ T442] ? kasan_save_stack (mm/kasan/common.c:49) [ 29.765333][ T442] ? kasan_save_stack (mm/kasan/common.c:48) [ 29.765498][ T442] ? __kasan_record_aux_stack (mm/kasan/generic.c:544) [ 29.765660][ T442] ? __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) [ 29.765878][ T442] ? __x64_sys_close (fs/open.c:1557 fs/open.c:1539 fs/open.c:1539) [ 29.766046][ T442] ? do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) [ 29.766196][ T442] ? entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) [ 29.766382][ T442] ? __lock_acquire (kernel/locking/lockdep.c:5226) [ 29.766535][ T442] ? find_held_lock (kernel/locking/lockdep.c:5339) [ 29.766689][ T442] ? __lock_release (kernel/locking/lockdep.c:5525) [ 29.766837][ T442] ? __virt_addr_valid (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:962 ./include/linux/mmzone.h:2058 arch/x86/mm/physaddr.c:65) [ 29.766986][ T442] ? __pfx___lock_release (kernel/locking/lockdep.c:5501) [ 29.767133][ T442] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814) [ 29.767282][ T442] __sys_sendmsg (net/socket.c:2680) [ 29.767430][ T442] ? __pfx___sys_sendmsg (net/socket.c:2665) [ 29.767576][ T442] ? __pfx_slab_free_after_rcu_debug (mm/slub.c:4643) [ 29.767771][ T442] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) [ 29.767922][ T442] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) [ 29.768105][ T442] RIP: 0033:0x7fd7a0b729a7 [ 29.768274][ T442] 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) [ 29.768791][ T442] RSP: 002b:00007ffea33837c8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e [ 29.769023][ T442] RAX: ffffffffffffffda RBX: 00007ffea3383ef0 RCX: 00007fd7a0b729a7 [ 29.769245][ T442] RDX: 0000000000000000 RSI: 00007ffea3383830 RDI: 0000000000000005 [ 29.769469][ T442] RBP: 0000000000000002 R08: 0000000000000003 R09: 0000000000000078 [ 29.769695][ T442] R10: 00007fd7a0a30ef8 R11: 0000000000000246 R12: 0000000000000002 Finger prints: print_deadlock_bug:validate_chain:__lock_acquire:down_read:blocking_notifier_call_chain