====================================================== WARNING: possible circular locking dependency detected 4.14.131 #25 Not tainted ------------------------------------------------------ syz-executor.4/28180 is trying to acquire lock: (dev->qdisc_tx_busylock ?: &qdisc_tx_busylock){+.-.}, at: [] spin_lock include/linux/spinlock.h:317 [inline] (dev->qdisc_tx_busylock ?: &qdisc_tx_busylock){+.-.}, at: [] __dev_xmit_skb net/core/dev.c:3202 [inline] (dev->qdisc_tx_busylock ?: &qdisc_tx_busylock){+.-.}, at: [] __dev_queue_xmit+0x1f0f/0x25e0 net/core/dev.c:3493 but task is already holding lock: (_xmit_ETHER#2){+.-.}, at: [] spin_lock include/linux/spinlock.h:317 [inline] (_xmit_ETHER#2){+.-.}, at: [] __netif_tx_lock include/linux/netdevice.h:3530 [inline] (_xmit_ETHER#2){+.-.}, at: [] sch_direct_xmit+0x1fc/0x550 net/sched/sch_generic.c:184 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #1 (_xmit_ETHER#2){+.-.}: lock_acquire+0x16f/0x430 kernel/locking/lockdep.c:3991 __raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline] _raw_spin_lock+0x2f/0x40 kernel/locking/spinlock.c:152 spin_lock include/linux/spinlock.h:317 [inline] __netif_tx_lock include/linux/netdevice.h:3530 [inline] sch_direct_xmit+0x1fc/0x550 net/sched/sch_generic.c:184 __dev_xmit_skb net/core/dev.c:3218 [inline] __dev_queue_xmit+0x1b6e/0x25e0 net/core/dev.c:3493 dev_queue_xmit+0x18/0x20 net/core/dev.c:3558 neigh_hh_output include/net/neighbour.h:490 [inline] neigh_output include/net/neighbour.h:498 [inline] ip6_finish_output2+0x10bd/0x21b0 net/ipv6/ip6_output.c:120 ip6_finish_output+0x4f4/0xb50 net/ipv6/ip6_output.c:154 NF_HOOK_COND include/linux/netfilter.h:239 [inline] ip6_output+0x20f/0x6d0 net/ipv6/ip6_output.c:171 dst_output include/net/dst.h:459 [inline] ip6_local_out+0x97/0x170 net/ipv6/output_core.c:178 ip6_send_skb+0xa2/0x330 net/ipv6/ip6_output.c:1688 udp_v6_send_skb+0x5c5/0xee0 net/ipv6/udp.c:1081 udpv6_sendmsg+0x1e38/0x2560 net/ipv6/udp.c:1353 inet_sendmsg+0x122/0x500 net/ipv4/af_inet.c:762 sock_sendmsg_nosec net/socket.c:646 [inline] sock_sendmsg+0xce/0x110 net/socket.c:656 ___sys_sendmsg+0x349/0x840 net/socket.c:2062 __sys_sendmmsg+0x152/0x3a0 net/socket.c:2152 SYSC_sendmmsg net/socket.c:2183 [inline] SyS_sendmmsg+0x35/0x60 net/socket.c:2178 do_syscall_64+0x1e8/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x42/0xb7 -> #0 (dev->qdisc_tx_busylock ?: &qdisc_tx_busylock){+.-.}: check_prev_add kernel/locking/lockdep.c:1901 [inline] check_prevs_add kernel/locking/lockdep.c:2018 [inline] validate_chain kernel/locking/lockdep.c:2460 [inline] __lock_acquire+0x2c89/0x45e0 kernel/locking/lockdep.c:3487 lock_acquire+0x16f/0x430 kernel/locking/lockdep.c:3991 __raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline] _raw_spin_lock+0x2f/0x40 kernel/locking/spinlock.c:152 spin_lock include/linux/spinlock.h:317 [inline] __dev_xmit_skb net/core/dev.c:3202 [inline] __dev_queue_xmit+0x1f0f/0x25e0 net/core/dev.c:3493 dev_queue_xmit+0x18/0x20 net/core/dev.c:3558 br_dev_queue_push_xmit+0x367/0x530 net/bridge/br_forward.c:55 NF_HOOK include/linux/netfilter.h:250 [inline] NF_HOOK include/linux/netfilter.h:244 [inline] br_forward_finish+0xbc/0x320 net/bridge/br_forward.c:67 NF_HOOK include/linux/netfilter.h:250 [inline] NF_HOOK include/linux/netfilter.h:244 [inline] __br_forward+0x560/0x9c0 net/bridge/br_forward.c:111 deliver_clone+0x61/0xc0 net/bridge/br_forward.c:127 maybe_deliver net/bridge/br_forward.c:168 [inline] maybe_deliver net/bridge/br_forward.c:156 [inline] br_flood+0x3c8/0x530 net/bridge/br_forward.c:210 br_dev_xmit+0x8a5/0xd40 net/bridge/br_device.c:67 __netdev_start_xmit include/linux/netdevice.h:4033 [inline] netdev_start_xmit include/linux/netdevice.h:4042 [inline] xmit_one net/core/dev.c:3009 [inline] dev_hard_start_xmit+0x18c/0x8b0 net/core/dev.c:3025 __dev_queue_xmit+0x1d95/0x25e0 net/core/dev.c:3525 dev_queue_xmit+0x18/0x20 net/core/dev.c:3558 neigh_hh_output include/net/neighbour.h:490 [inline] neigh_output include/net/neighbour.h:498 [inline] ip_finish_output2+0xddc/0x14a0 net/ipv4/ip_output.c:229 ip_finish_output+0x56d/0xc60 net/ipv4/ip_output.c:317 NF_HOOK_COND include/linux/netfilter.h:239 [inline] ip_mc_output+0x24a/0xd40 net/ipv4/ip_output.c:390 dst_output include/net/dst.h:459 [inline] ip_local_out+0x97/0x170 net/ipv4/ip_output.c:124 iptunnel_xmit+0x564/0x930 net/ipv4/ip_tunnel_core.c:91 ip_tunnel_xmit+0xfd9/0x3189 net/ipv4/ip_tunnel.c:795 __gre_xmit+0x4eb/0x890 net/ipv4/ip_gre.c:444 gre_tap_xmit net/ipv4/ip_gre.c:775 [inline] gre_tap_xmit+0x29d/0x370 net/ipv4/ip_gre.c:759 __netdev_start_xmit include/linux/netdevice.h:4033 [inline] netdev_start_xmit include/linux/netdevice.h:4042 [inline] xmit_one net/core/dev.c:3009 [inline] dev_hard_start_xmit+0x18c/0x8b0 net/core/dev.c:3025 sch_direct_xmit+0x27a/0x550 net/sched/sch_generic.c:186 __dev_xmit_skb net/core/dev.c:3218 [inline] __dev_queue_xmit+0x1b6e/0x25e0 net/core/dev.c:3493 dev_queue_xmit+0x18/0x20 net/core/dev.c:3558 br_dev_queue_push_xmit+0x367/0x530 net/bridge/br_forward.c:55 NF_HOOK include/linux/netfilter.h:250 [inline] NF_HOOK include/linux/netfilter.h:244 [inline] br_forward_finish+0xbc/0x320 net/bridge/br_forward.c:67 NF_HOOK include/linux/netfilter.h:250 [inline] NF_HOOK include/linux/netfilter.h:244 [inline] __br_forward+0x560/0x9c0 net/bridge/br_forward.c:111 deliver_clone+0x61/0xc0 net/bridge/br_forward.c:127 maybe_deliver net/bridge/br_forward.c:168 [inline] maybe_deliver net/bridge/br_forward.c:156 [inline] br_flood+0x3c8/0x530 net/bridge/br_forward.c:210 br_dev_xmit+0x8a5/0xd40 net/bridge/br_device.c:67 __netdev_start_xmit include/linux/netdevice.h:4033 [inline] netdev_start_xmit include/linux/netdevice.h:4042 [inline] xmit_one net/core/dev.c:3009 [inline] dev_hard_start_xmit+0x18c/0x8b0 net/core/dev.c:3025 __dev_queue_xmit+0x1d95/0x25e0 net/core/dev.c:3525 dev_queue_xmit+0x18/0x20 net/core/dev.c:3558 neigh_hh_output include/net/neighbour.h:490 [inline] neigh_output include/net/neighbour.h:498 [inline] ip_finish_output2+0xddc/0x14a0 net/ipv4/ip_output.c:229 ip_finish_output+0x56d/0xc60 net/ipv4/ip_output.c:317 NF_HOOK_COND include/linux/netfilter.h:239 [inline] ip_mc_output+0x24a/0xd40 net/ipv4/ip_output.c:390 dst_output include/net/dst.h:459 [inline] ip_local_out+0x97/0x170 net/ipv4/ip_output.c:124 iptunnel_xmit+0x564/0x930 net/ipv4/ip_tunnel_core.c:91 ip_tunnel_xmit+0xfd9/0x3189 net/ipv4/ip_tunnel.c:795 __gre_xmit+0x4eb/0x890 net/ipv4/ip_gre.c:444 erspan_xmit net/ipv4/ip_gre.c:750 [inline] erspan_xmit+0x441/0x11c0 net/ipv4/ip_gre.c:725 __netdev_start_xmit include/linux/netdevice.h:4033 [inline] netdev_start_xmit include/linux/netdevice.h:4042 [inline] xmit_one net/core/dev.c:3009 [inline] dev_hard_start_xmit+0x18c/0x8b0 net/core/dev.c:3025 sch_direct_xmit+0x27a/0x550 net/sched/sch_generic.c:186 __dev_xmit_skb net/core/dev.c:3218 [inline] __dev_queue_xmit+0x1b6e/0x25e0 net/core/dev.c:3493 dev_queue_xmit+0x18/0x20 net/core/dev.c:3558 neigh_resolve_output net/core/neighbour.c:1362 [inline] neigh_resolve_output+0x4d8/0x870 net/core/neighbour.c:1342 neigh_output include/net/neighbour.h:500 [inline] ip_finish_output2+0x766/0x14a0 net/ipv4/ip_output.c:229 ip_finish_output+0x56d/0xc60 net/ipv4/ip_output.c:317 NF_HOOK_COND include/linux/netfilter.h:239 [inline] ip_output+0x1e6/0x590 net/ipv4/ip_output.c:405 dst_output include/net/dst.h:459 [inline] ip_local_out+0x97/0x170 net/ipv4/ip_output.c:124 ip_send_skb+0x3e/0xc0 net/ipv4/ip_output.c:1418 udp_send_skb+0x53f/0xb90 net/ipv4/udp.c:829 udp_push_pending_frames+0x4e/0xe0 net/ipv4/udp.c:857 udp_sendmsg+0x1066/0x1da0 net/ipv4/udp.c:1085 udpv6_sendmsg+0x1e57/0x2560 net/ipv6/udp.c:1198 inet_sendmsg+0x122/0x500 net/ipv4/af_inet.c:762 sock_sendmsg_nosec net/socket.c:646 [inline] sock_sendmsg+0xce/0x110 net/socket.c:656 ___sys_sendmsg+0x349/0x840 net/socket.c:2062 __sys_sendmmsg+0x152/0x3a0 net/socket.c:2152 SYSC_sendmmsg net/socket.c:2183 [inline] SyS_sendmmsg+0x35/0x60 net/socket.c:2178 do_syscall_64+0x1e8/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x42/0xb7 other info that might help us debug this: Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(_xmit_ETHER#2); lock(dev->qdisc_tx_busylock ?: &qdisc_tx_busylock); lock(_xmit_ETHER#2); lock(dev->qdisc_tx_busylock ?: &qdisc_tx_busylock); *** DEADLOCK *** 14 locks held by syz-executor.4/28180: #0: (sk_lock-AF_INET6){+.+.}, at: [] lock_sock include/net/sock.h:1462 [inline] #0: (sk_lock-AF_INET6){+.+.}, at: [] udp_sendmsg+0xc6c/0x1da0 net/ipv4/udp.c:909 #1: (rcu_read_lock_bh){....}, at: [] lwtunnel_xmit_redirect include/net/lwtunnel.h:92 [inline] #1: (rcu_read_lock_bh){....}, at: [] ip_finish_output2+0x256/0x14a0 net/ipv4/ip_output.c:213 #2: (rcu_read_lock_bh){....}, at: [] __dev_queue_xmit+0x1e2/0x25e0 net/core/dev.c:3459 #3: (dev->qdisc_running_key ?: &qdisc_running_key){+...}, at: [] dev_queue_xmit+0x18/0x20 net/core/dev.c:3558 #4: (_xmit_ETHER#2){+.-.}, at: [] spin_lock include/linux/spinlock.h:317 [inline] #4: (_xmit_ETHER#2){+.-.}, at: [] __netif_tx_lock include/linux/netdevice.h:3530 [inline] #4: (_xmit_ETHER#2){+.-.}, at: [] sch_direct_xmit+0x1fc/0x550 net/sched/sch_generic.c:184 #5: (rcu_read_lock_bh){....}, at: [] lwtunnel_xmit_redirect include/net/lwtunnel.h:92 [inline] #5: (rcu_read_lock_bh){....}, at: [] ip_finish_output2+0x256/0x14a0 net/ipv4/ip_output.c:213 #6: (rcu_read_lock_bh){....}, at: [] __dev_queue_xmit+0x1e2/0x25e0 net/core/dev.c:3459 #7: (rcu_read_lock){....}, at: [] br_dev_xmit+0xb2/0xd40 net/bridge/br_device.c:39 #8: (rcu_read_lock_bh){....}, at: [] __dev_queue_xmit+0x1e2/0x25e0 net/core/dev.c:3459 #9: (dev->qdisc_running_key ?: &qdisc_running_key){+...}, at: [] dev_queue_xmit+0x18/0x20 net/core/dev.c:3558 #10: (rcu_read_lock_bh){....}, at: [] lwtunnel_xmit_redirect include/net/lwtunnel.h:92 [inline] #10: (rcu_read_lock_bh){....}, at: [] ip_finish_output2+0x256/0x14a0 net/ipv4/ip_output.c:213 #11: (rcu_read_lock_bh){....}, at: [] __dev_queue_xmit+0x1e2/0x25e0 net/core/dev.c:3459 #12: (rcu_read_lock){....}, at: [] br_dev_xmit+0xb2/0xd40 net/bridge/br_device.c:39 #13: (rcu_read_lock_bh){....}, at: [] __dev_queue_xmit+0x1e2/0x25e0 net/core/dev.c:3459 stack backtrace: CPU: 1 PID: 28180 Comm: syz-executor.4 Not tainted 4.14.131 #25 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x138/0x19c lib/dump_stack.c:53 print_circular_bug.isra.0.cold+0x1cc/0x28f kernel/locking/lockdep.c:1258 check_prev_add kernel/locking/lockdep.c:1901 [inline] check_prevs_add kernel/locking/lockdep.c:2018 [inline] validate_chain kernel/locking/lockdep.c:2460 [inline] __lock_acquire+0x2c89/0x45e0 kernel/locking/lockdep.c:3487 lock_acquire+0x16f/0x430 kernel/locking/lockdep.c:3991 __raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline] _raw_spin_lock+0x2f/0x40 kernel/locking/spinlock.c:152 spin_lock include/linux/spinlock.h:317 [inline] __dev_xmit_skb net/core/dev.c:3202 [inline] __dev_queue_xmit+0x1f0f/0x25e0 net/core/dev.c:3493 dev_queue_xmit+0x18/0x20 net/core/dev.c:3558 br_dev_queue_push_xmit+0x367/0x530 net/bridge/br_forward.c:55 NF_HOOK include/linux/netfilter.h:250 [inline] NF_HOOK include/linux/netfilter.h:244 [inline] br_forward_finish+0xbc/0x320 net/bridge/br_forward.c:67 NF_HOOK include/linux/netfilter.h:250 [inline] NF_HOOK include/linux/netfilter.h:244 [inline] __br_forward+0x560/0x9c0 net/bridge/br_forward.c:111 deliver_clone+0x61/0xc0 net/bridge/br_forward.c:127 maybe_deliver net/bridge/br_forward.c:168 [inline] maybe_deliver net/bridge/br_forward.c:156 [inline] br_flood+0x3c8/0x530 net/bridge/br_forward.c:210 br_dev_xmit+0x8a5/0xd40 net/bridge/br_device.c:67 __netdev_start_xmit include/linux/netdevice.h:4033 [inline] netdev_start_xmit include/linux/netdevice.h:4042 [inline] xmit_one net/core/dev.c:3009 [inline] dev_hard_start_xmit+0x18c/0x8b0 net/core/dev.c:3025 __dev_queue_xmit+0x1d95/0x25e0 net/core/dev.c:3525 dev_queue_xmit+0x18/0x20 net/core/dev.c:3558 neigh_hh_output include/net/neighbour.h:490 [inline] neigh_output include/net/neighbour.h:498 [inline] ip_finish_output2+0xddc/0x14a0 net/ipv4/ip_output.c:229 ip_finish_output+0x56d/0xc60 net/ipv4/ip_output.c:317 NF_HOOK_COND include/linux/netfilter.h:239 [inline] ip_mc_output+0x24a/0xd40 net/ipv4/ip_output.c:390 dst_output include/net/dst.h:459 [inline] ip_local_out+0x97/0x170 net/ipv4/ip_output.c:124 iptunnel_xmit+0x564/0x930 net/ipv4/ip_tunnel_core.c:91 ip_tunnel_xmit+0xfd9/0x3189 net/ipv4/ip_tunnel.c:795 __gre_xmit+0x4eb/0x890 net/ipv4/ip_gre.c:444 gre_tap_xmit net/ipv4/ip_gre.c:775 [inline] gre_tap_xmit+0x29d/0x370 net/ipv4/ip_gre.c:759 __netdev_start_xmit include/linux/netdevice.h:4033 [inline] netdev_start_xmit include/linux/netdevice.h:4042 [inline] xmit_one net/core/dev.c:3009 [inline] dev_hard_start_xmit+0x18c/0x8b0 net/core/dev.c:3025 sch_direct_xmit+0x27a/0x550 net/sched/sch_generic.c:186 __dev_xmit_skb net/core/dev.c:3218 [inline] __dev_queue_xmit+0x1b6e/0x25e0 net/core/dev.c:3493 dev_queue_xmit+0x18/0x20 net/core/dev.c:3558 br_dev_queue_push_xmit+0x367/0x530 net/bridge/br_forward.c:55 NF_HOOK include/linux/netfilter.h:250 [inline] NF_HOOK include/linux/netfilter.h:244 [inline] br_forward_finish+0xbc/0x320 net/bridge/br_forward.c:67 NF_HOOK include/linux/netfilter.h:250 [inline] NF_HOOK include/linux/netfilter.h:244 [inline] __br_forward+0x560/0x9c0 net/bridge/br_forward.c:111 deliver_clone+0x61/0xc0 net/bridge/br_forward.c:127 maybe_deliver net/bridge/br_forward.c:168 [inline] maybe_deliver net/bridge/br_forward.c:156 [inline] br_flood+0x3c8/0x530 net/bridge/br_forward.c:210 br_dev_xmit+0x8a5/0xd40 net/bridge/br_device.c:67 __netdev_start_xmit include/linux/netdevice.h:4033 [inline] netdev_start_xmit include/linux/netdevice.h:4042 [inline] xmit_one net/core/dev.c:3009 [inline] dev_hard_start_xmit+0x18c/0x8b0 net/core/dev.c:3025 __dev_queue_xmit+0x1d95/0x25e0 net/core/dev.c:3525 dev_queue_xmit+0x18/0x20 net/core/dev.c:3558 neigh_hh_output include/net/neighbour.h:490 [inline] neigh_output include/net/neighbour.h:498 [inline] ip_finish_output2+0xddc/0x14a0 net/ipv4/ip_output.c:229 ip_finish_output+0x56d/0xc60 net/ipv4/ip_output.c:317 NF_HOOK_COND include/linux/netfilter.h:239 [inline] ip_mc_output+0x24a/0xd40 net/ipv4/ip_output.c:390 dst_output include/net/dst.h:459 [inline] ip_local_out+0x97/0x170 net/ipv4/ip_output.c:124 iptunnel_xmit+0x564/0x930 net/ipv4/ip_tunnel_core.c:91 ip_tunnel_xmit+0xfd9/0x3189 net/ipv4/ip_tunnel.c:795 __gre_xmit+0x4eb/0x890 net/ipv4/ip_gre.c:444 erspan_xmit net/ipv4/ip_gre.c:750 [inline] erspan_xmit+0x441/0x11c0 net/ipv4/ip_gre.c:725 __netdev_start_xmit include/linux/netdevice.h:4033 [inline] netdev_start_xmit include/linux/netdevice.h:4042 [inline] xmit_one net/core/dev.c:3009 [inline] dev_hard_start_xmit+0x18c/0x8b0 net/core/dev.c:3025 sch_direct_xmit+0x27a/0x550 net/sched/sch_generic.c:186 __dev_xmit_skb net/core/dev.c:3218 [inline] __dev_queue_xmit+0x1b6e/0x25e0 net/core/dev.c:3493 dev_queue_xmit+0x18/0x20 net/core/dev.c:3558 neigh_resolve_output net/core/neighbour.c:1362 [inline] neigh_resolve_output+0x4d8/0x870 net/core/neighbour.c:1342 neigh_output include/net/neighbour.h:500 [inline] ip_finish_output2+0x766/0x14a0 net/ipv4/ip_output.c:229 ip_finish_output+0x56d/0xc60 net/ipv4/ip_output.c:317 NF_HOOK_COND include/linux/netfilter.h:239 [inline] ip_output+0x1e6/0x590 net/ipv4/ip_output.c:405 dst_output include/net/dst.h:459 [inline] ip_local_out+0x97/0x170 net/ipv4/ip_output.c:124 ip_send_skb+0x3e/0xc0 net/ipv4/ip_output.c:1418 udp_send_skb+0x53f/0xb90 net/ipv4/udp.c:829 udp_push_pending_frames+0x4e/0xe0 net/ipv4/udp.c:857 udp_sendmsg+0x1066/0x1da0 net/ipv4/udp.c:1085 udpv6_sendmsg+0x1e57/0x2560 net/ipv6/udp.c:1198 inet_sendmsg+0x122/0x500 net/ipv4/af_inet.c:762 sock_sendmsg_nosec net/socket.c:646 [inline] sock_sendmsg+0xce/0x110 net/socket.c:656 ___sys_sendmsg+0x349/0x840 net/socket.c:2062 __sys_sendmmsg+0x152/0x3a0 net/socket.c:2152 SYSC_sendmmsg net/socket.c:2183 [inline] SyS_sendmmsg+0x35/0x60 net/socket.c:2178 do_syscall_64+0x1e8/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x4597c9 RSP: 002b:00007f8b8435bc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000133 RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 00000000004597c9 RDX: 00000000000005c3 RSI: 0000000020000240 RDI: 0000000000000004 RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f8b8435c6d4 R13: 00000000004c6df8 R14: 00000000004dc140 R15: 00000000ffffffff net_ratelimit: 90 callbacks suppressed bridge0: received packet on gretap0 with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0) bridge0: received packet on gretap0 with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0) bridge0: received packet on gretap0 with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0) bridge0: received packet on gretap0 with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0) bridge0: received packet on gretap0 with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0) bridge0: received packet on gretap0 with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0) bridge0: received packet on gretap0 with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0) bridge0: received packet on gretap0 with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0) bridge0: received packet on gretap0 with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0) bridge0: received packet on gretap0 with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0) syz-executor.4 (28180) used greatest stack depth: 18936 bytes left delete_channel: no stack delete_channel: no stack delete_channel: no stack delete_channel: no stack delete_channel: no stack delete_channel: no stack delete_channel: no stack delete_channel: no stack