erspan1: entered promiscuous mode ============================================ WARNING: possible recursive locking detected syzkaller #0 Tainted: G L -------------------------------------------- syz.3.673/8461 is trying to acquire lock: ffff888028c05158 (&qdisc_xmit_lock_key #4){+.-.}-{3:3} , at: spin_lock include/linux/spinlock.h:342 [inline] , at: __netif_tx_lock include/linux/netdevice.h:4799 [inline] , at: sch_direct_xmit+0x3b5/0xc70 net/sched/sch_generic.c:370 but task is already holding lock: ffff888055efb958 (&qdisc_xmit_lock_key#4){+.-.}-{3:3}, at: spin_lock include/linux/spinlock.h:342 [inline] ffff888055efb958 (&qdisc_xmit_lock_key#4){+.-.}-{3:3}, at: __netif_tx_lock include/linux/netdevice.h:4799 [inline] ffff888055efb958 (&qdisc_xmit_lock_key#4){+.-.}-{3:3}, at: sch_direct_xmit+0x3b5/0xc70 net/sched/sch_generic.c:370 other info that might help us debug this: Possible unsafe locking scenario: CPU0 ---- lock(&qdisc_xmit_lock_key#4 ); lock(&qdisc_xmit_lock_key#4); *** DEADLOCK *** May be due to missing lock nesting notation 10 locks held by syz.3.673/8461: #0: ffffffff90dd52e8 ( &ops->srcu#2){.+.+}-{0:0}, at: srcu_lock_acquire include/linux/srcu.h:187 [inline] &ops->srcu#2){.+.+}-{0:0}, at: srcu_read_lock include/linux/srcu.h:294 [inline] &ops->srcu#2){.+.+}-{0:0}, at: rtnl_link_ops_get+0x113/0x2c0 net/core/rtnetlink.c:574 #1: ffffffff9063ab40 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock net/core/rtnetlink.c:80 [inline] (rtnl_mutex){+.+.}-{4:4}, at: rtnl_nets_lock net/core/rtnetlink.c:341 [inline] (rtnl_mutex){+.+.}-{4:4}, at: rtnl_newlink+0x8bb/0x2380 net/core/rtnetlink.c:4150 #2: ffffffff8e7e6060 (rcu_read_lock_bh){....}-{1:3}, at: local_bh_disable include/linux/bottom_half.h:20 [inline] #2: ffffffff8e7e6060 (rcu_read_lock_bh){....}-{1:3}, at: rcu_read_lock_bh include/linux/rcupdate.h:893 [inline] #2: ffffffff8e7e6060 (rcu_read_lock_bh){....}-{1:3}, at: __dev_queue_xmit+0x296/0x4940 net/core/dev.c:4793 #3: ffff888026007228 (dev->qdisc_tx_busylock ?: &qdisc_tx_busylock#5){+...}-{3:3}, at: spin_trylock include/linux/spinlock.h:354 [inline] #3: ffff888026007228 (dev->qdisc_tx_busylock ?: &qdisc_tx_busylock#5){+...}-{3:3}, at: qdisc_run_begin include/net/sch_generic.h:205 [inline] #3: ffff888026007228 (dev->qdisc_tx_busylock ?: &qdisc_tx_busylock#5){+...}-{3:3}, at: __dev_xmit_skb net/core/dev.c:4198 [inline] #3: ffff888026007228 (dev->qdisc_tx_busylock ?: &qdisc_tx_busylock#5){+...}-{3:3}, at: __dev_queue_xmit+0x24e2/0x4940 net/core/dev.c:4833 #4: ffff888055efb958 (&qdisc_xmit_lock_key#4){+.-.}-{3:3}, at: spin_lock include/linux/spinlock.h:342 [inline] #4: ffff888055efb958 (&qdisc_xmit_lock_key#4){+.-.}-{3:3}, at: __netif_tx_lock include/linux/netdevice.h:4799 [inline] #4: ffff888055efb958 (&qdisc_xmit_lock_key#4){+.-.}-{3:3}, at: sch_direct_xmit+0x3b5/0xc70 net/sched/sch_generic.c:370 #5: ffffffff8e7e60c0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:300 [inline] #5: ffffffff8e7e60c0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:840 [inline] #5: ffffffff8e7e60c0 (rcu_read_lock){....}-{1:3}, at: ip_output+0xb3/0xc10 net/ipv4/ip_output.c:432 #6: ffffffff8e7e60c0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:300 [inline] ffffffff8e7e60c0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:840 [inline] ffffffff8e7e60c0 (rcu_read_lock){....}-{1:3}, at: ip_finish_output2+0x356/0x2400 net/ipv4/ip_output.c:229 #7: ffffffff8e7e60c0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:300 [inline] #7: ffffffff8e7e60c0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:840 [inline] #7: ffffffff8e7e60c0 (rcu_read_lock){....}-{1:3}, at: arp_xmit+0x26/0x2e0 net/ipv4/arp.c:663 #8: ffffffff8e7e6060 ( rcu_read_lock_bh ){....}-{1:3} , at: local_bh_disable include/linux/bottom_half.h:20 [inline] , at: rcu_read_lock_bh include/linux/rcupdate.h:893 [inline] , at: __dev_queue_xmit+0x296/0x4940 net/core/dev.c:4793 #9: ffff88803da81228 (dev->qdisc_tx_busylock ?: &qdisc_tx_busylock#5 ){+...}-{3:3} , at: spin_trylock include/linux/spinlock.h:354 [inline] , at: qdisc_run_begin include/net/sch_generic.h:205 [inline] , at: __dev_xmit_skb net/core/dev.c:4198 [inline] , at: __dev_queue_xmit+0x24e2/0x4940 net/core/dev.c:4833 stack backtrace: CPU: 2 UID: 0 PID: 8461 Comm: syz.3.673 Tainted: G L syzkaller #0 PREEMPT(full) Tainted: [L]=SOFTLOCKUP Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x100/0x190 lib/dump_stack.c:120 print_deadlock_bug.cold+0xbd/0xca kernel/locking/lockdep.c:3041 check_deadlock kernel/locking/lockdep.c:3093 [inline] validate_chain kernel/locking/lockdep.c:3895 [inline] __lock_acquire+0x1256/0x1a40 kernel/locking/lockdep.c:5237 lock_acquire kernel/locking/lockdep.c:5868 [inline] lock_acquire+0x1b9/0x370 kernel/locking/lockdep.c:5825 __raw_spin_lock include/linux/spinlock_api_smp.h:158 [inline] _raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:158 spin_lock include/linux/spinlock.h:342 [inline] __netif_tx_lock include/linux/netdevice.h:4799 [inline] sch_direct_xmit+0x3b5/0xc70 net/sched/sch_generic.c:370 __dev_xmit_skb net/core/dev.c:4211 [inline] __dev_queue_xmit+0x278a/0x4940 net/core/dev.c:4833 dev_queue_xmit include/linux/netdevice.h:3436 [inline] arp_xmit_finish net/ipv4/arp.c:655 [inline] NF_HOOK include/linux/netfilter.h:318 [inline] NF_HOOK include/linux/netfilter.h:312 [inline] arp_xmit+0x106/0x2e0 net/ipv4/arp.c:665 arp_send_dst net/ipv4/arp.c:320 [inline] arp_send_dst+0x200/0x280 net/ipv4/arp.c:301 arp_solicit+0x672/0x1070 net/ipv4/arp.c:392 neigh_probe+0xce/0x110 net/core/neighbour.c:1093 __neigh_event_send+0xabe/0x13d0 net/core/neighbour.c:1273 neigh_event_send_probe include/net/neighbour.h:480 [inline] neigh_event_send include/net/neighbour.h:486 [inline] neigh_event_send include/net/neighbour.h:484 [inline] neigh_resolve_output+0x550/0x8f0 net/core/neighbour.c:1600 neigh_output include/net/neighbour.h:560 [inline] ip_finish_output2+0x851/0x2400 net/ipv4/ip_output.c:236 __ip_finish_output.part.0+0x444/0x6f0 net/ipv4/ip_output.c:314 __ip_finish_output net/ipv4/ip_output.c:302 [inline] ip_finish_output net/ipv4/ip_output.c:324 [inline] NF_HOOK_COND include/linux/netfilter.h:307 [inline] ip_output+0x39b/0xc10 net/ipv4/ip_output.c:437 dst_output include/net/dst.h:470 [inline] ip_local_out+0x193/0x1f0 net/ipv4/ip_output.c:131 iptunnel_xmit+0x722/0xd20 net/ipv4/ip_tunnel_core.c:97 ip_tunnel_xmit+0x1b91/0x3210 net/ipv4/ip_tunnel.c:848 __gre_xmit+0x820/0xb20 net/ipv4/ip_gre.c:491 erspan_xmit+0x55a/0x1ec0 net/ipv4/ip_gre.c:750 __netdev_start_xmit include/linux/netdevice.h:5387 [inline] netdev_start_xmit include/linux/netdevice.h:5396 [inline] xmit_one net/core/dev.c:3889 [inline] dev_hard_start_xmit+0x121/0x760 net/core/dev.c:3905 sch_direct_xmit+0x1b2/0xc70 net/sched/sch_generic.c:372 __dev_xmit_skb net/core/dev.c:4211 [inline] __dev_queue_xmit+0x278a/0x4940 net/core/dev.c:4833 dev_queue_xmit include/linux/netdevice.h:3436 [inline] alb_send_lp_vid+0x31e/0x540 drivers/net/bonding/bond_alb.c:949 alb_send_learning_packets+0xe0/0x2f0 drivers/net/bonding/bond_alb.c:1012 alb_fasten_mac_swap+0x47f/0xa90 drivers/net/bonding/bond_alb.c:1076 bond_alb_handle_active_change+0x634/0x10b0 drivers/net/bonding/bond_alb.c:1774 bond_change_active_slave+0x160c/0x2ed0 drivers/net/bonding/bond_main.c:1309 bond_select_active_slave+0x3f5/0xca0 drivers/net/bonding/bond_main.c:1379 bond_enslave+0x4513/0x5cb0 drivers/net/bonding/bond_main.c:2298 do_set_master+0x40f/0x730 net/core/rtnetlink.c:3012 rtnl_newlink_create net/core/rtnetlink.c:3919 [inline] __rtnl_newlink net/core/rtnetlink.c:4036 [inline] rtnl_newlink+0x15c7/0x2380 net/core/rtnetlink.c:4151 rtnetlink_rcv_msg+0x95e/0xe90 net/core/rtnetlink.c:7068 netlink_rcv_skb+0x159/0x420 net/netlink/af_netlink.c:2556 netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline] netlink_unicast+0x585/0x850 net/netlink/af_netlink.c:1345 netlink_sendmsg+0x8b0/0xda0 net/netlink/af_netlink.c:1900 sock_sendmsg_nosec net/socket.c:775 [inline] __sock_sendmsg net/socket.c:790 [inline] ____sys_sendmsg+0xa4d/0xbe0 net/socket.c:2684 ___sys_sendmsg+0x190/0x1e0 net/socket.c:2738 __sys_sendmsg+0x160/0x210 net/socket.c:2770 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x115/0x870 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fab3679ce59 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fab3759d028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007fab36a15fa0 RCX: 00007fab3679ce59 RDX: 0000000000000000 RSI: 00002000000000c0 RDI: 0000000000000003 RBP: 00007fab36832e6f R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fab36a16038 R14: 00007fab36a15fa0 R15: 00007ffce6ea7bf8 bond3: (slave erspan1): Enslaving as an active interface with an up link