IPv6: ADDRCONF(NETDEV_CHANGE): Y4`Ҙ: link becomes ready ip6_tunnel: ip6tnl2 xmit: Local address not yet configured! ip6_tunnel: ip6tnl1 xmit: Local address not yet configured! ============================================ WARNING: possible recursive locking detected 4.14.90+ #29 Not tainted -------------------------------------------- syz-executor5/11042 is trying to acquire lock: (_xmit_TUNNEL6#2){+.-.}, at: [] spin_lock include/linux/spinlock.h:317 [inline] (_xmit_TUNNEL6#2){+.-.}, at: [] __netif_tx_lock include/linux/netdevice.h:3527 [inline] (_xmit_TUNNEL6#2){+.-.}, at: [] __dev_queue_xmit+0x1348/0x1f40 net/core/dev.c:3521 but task is already holding lock: (_xmit_TUNNEL6#2){+.-.}, at: [] spin_lock include/linux/spinlock.h:317 [inline] (_xmit_TUNNEL6#2){+.-.}, at: [] __netif_tx_lock include/linux/netdevice.h:3527 [inline] (_xmit_TUNNEL6#2){+.-.}, at: [] __dev_queue_xmit+0x1348/0x1f40 net/core/dev.c:3521 other info that might help us debug this: Possible unsafe locking scenario: CPU0 ---- lock(_xmit_TUNNEL6#2); lock(_xmit_TUNNEL6#2); *** DEADLOCK *** May be due to missing lock nesting notation 6 locks held by syz-executor5/11042: #0: (rcu_read_lock_bh){....}, at: [] ip_finish_output2+0x215/0x12f0 net/ipv4/ip_output.c:199 #1: (rcu_read_lock_bh){....}, at: [] __dev_queue_xmit+0x1e5/0x1f40 net/core/dev.c:3459 #2: (_xmit_TUNNEL6#2){+.-.}, at: [] spin_lock include/linux/spinlock.h:317 [inline] #2: (_xmit_TUNNEL6#2){+.-.}, at: [] __netif_tx_lock include/linux/netdevice.h:3527 [inline] #2: (_xmit_TUNNEL6#2){+.-.}, at: [] __dev_queue_xmit+0x1348/0x1f40 net/core/dev.c:3521 #3: (k-slock-AF_INET){+...}, at: [] spin_trylock include/linux/spinlock.h:327 [inline] #3: (k-slock-AF_INET){+...}, at: [] icmp_xmit_lock net/ipv4/icmp.c:219 [inline] #3: (k-slock-AF_INET){+...}, at: [] icmp_send+0x4f7/0x12a0 net/ipv4/icmp.c:668 #4: (rcu_read_lock_bh){....}, at: [] ip_finish_output2+0x215/0x12f0 net/ipv4/ip_output.c:199 #5: (rcu_read_lock_bh){....}, at: [] __dev_queue_xmit+0x1e5/0x1f40 net/core/dev.c:3459 stack backtrace: CPU: 1 PID: 11042 Comm: syz-executor5 Not tainted 4.14.90+ #29 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0xb9/0x11b lib/dump_stack.c:53 print_deadlock_bug kernel/locking/lockdep.c:1796 [inline] check_deadlock kernel/locking/lockdep.c:1843 [inline] validate_chain kernel/locking/lockdep.c:2444 [inline] __lock_acquire.cold.52+0x639/0xa99 kernel/locking/lockdep.c:3487 lock_acquire+0x10f/0x380 kernel/locking/lockdep.c:3991 __raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline] _raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:152 spin_lock include/linux/spinlock.h:317 [inline] __netif_tx_lock include/linux/netdevice.h:3527 [inline] __dev_queue_xmit+0x1348/0x1f40 net/core/dev.c:3521 neigh_output include/net/neighbour.h:500 [inline] ip_finish_output2+0x9ac/0x12f0 net/ipv4/ip_output.c:229 ip_finish_output+0x3a5/0xc40 net/ipv4/ip_output.c:317 NF_HOOK_COND include/linux/netfilter.h:239 [inline] ip_output+0x1c9/0x520 net/ipv4/ip_output.c:405 dst_output include/net/dst.h:459 [inline] ip_local_out+0x94/0x170 net/ipv4/ip_output.c:124 ip_send_skb+0x37/0xb0 net/ipv4/ip_output.c:1417 ip_push_pending_frames+0x5e/0x80 net/ipv4/ip_output.c:1437 icmp_push_reply+0x38e/0x510 net/ipv4/icmp.c:394 icmp_send+0x9ef/0x12a0 net/ipv4/icmp.c:741 ipv4_link_failure+0x24/0x1b0 net/ipv4/route.c:1196 dst_link_failure include/net/dst.h:442 [inline] vti6_xmit net/ipv6/ip6_vti.c:521 [inline] vti6_tnl_xmit+0xac0/0x1580 net/ipv6/ip6_vti.c:560 ip6_tunnel: ip6tnl2 xmit: Local address not yet configured! __netdev_start_xmit include/linux/netdevice.h:4030 [inline] netdev_start_xmit include/linux/netdevice.h:4039 [inline] xmit_one net/core/dev.c:3009 [inline] dev_hard_start_xmit+0x191/0x890 net/core/dev.c:3025 __dev_queue_xmit+0x13d9/0x1f40 net/core/dev.c:3525 ip6_tunnel: ip6tnl1 xmit: Local address not yet configured! neigh_output include/net/neighbour.h:500 [inline] ip_finish_output2+0x9ac/0x12f0 net/ipv4/ip_output.c:229 ip_finish_output+0x3a5/0xc40 net/ipv4/ip_output.c:317 NF_HOOK_COND include/linux/netfilter.h:239 [inline] ip_output+0x1c9/0x520 net/ipv4/ip_output.c:405 dst_output include/net/dst.h:459 [inline] ip_local_out+0x94/0x170 net/ipv4/ip_output.c:124 ip_send_skb+0x37/0xb0 net/ipv4/ip_output.c:1417 udp_send_skb+0x533/0xb90 net/ipv4/udp.c:829 udp_sendmsg+0x16ce/0x1da0 net/ipv4/udp.c:1053 udpv6_sendmsg+0x125f/0x2510 net/ipv6/udp.c:1193 inet_sendmsg+0x168/0x540 net/ipv4/af_inet.c:781 sock_sendmsg_nosec net/socket.c:645 [inline] sock_sendmsg+0xb5/0x100 net/socket.c:655 sock_write_iter+0x209/0x350 net/socket.c:924 call_write_iter include/linux/fs.h:1784 [inline] new_sync_write fs/read_write.c:471 [inline] __vfs_write+0x417/0x5c0 fs/read_write.c:484 ip6_tunnel: ip6tnl1 xmit: Local address not yet configured! vfs_write+0x17f/0x4d0 fs/read_write.c:546 SYSC_write fs/read_write.c:593 [inline] SyS_write+0xc2/0x1a0 fs/read_write.c:585 do_syscall_64+0x19b/0x4b0 arch/x86/entry/common.c:289 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x457669 RSP: 002b:00007fe804392c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000457669 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000003 RBP: 000000000072bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fe8043936d4 R13: 00000000004c6188 R14: 00000000004dada0 R15: 00000000ffffffff SELinux: security_context_str_to_sid(root) failed for (dev bpf, type bpf) errno=-22 ip6_tunnel: ip6tnl2 xmit: Local address not yet configured! SELinux: security_context_str_to_sid(root) failed for (dev bpf, type bpf) errno=-22 SELinux: security_context_str_to_sid(root) failed for (dev bpf, type bpf) errno=-22 SELinux: security_context_str_to_sid(root) failed for (dev bpf, type bpf) errno=-22 SELinux: security_context_str_to_sid(root) failed for (dev bpf, type bpf) errno=-22 SELinux: security_context_str_to_sid(root) failed for (dev bpf, type bpf) errno=-22 SELinux: security_context_str_to_sid(root) failed for (dev bpf, type bpf) errno=-22 netlink: 60 bytes leftover after parsing attributes in process `syz-executor0'. SELinux: security_context_str_to_sid(root) failed for (dev bpf, type bpf) errno=-22 SELinux: security_context_str_to_sid(root) failed for (dev bpf, type bpf) errno=-22 netlink: 60 bytes leftover after parsing attributes in process `syz-executor0'. netlink: 60 bytes leftover after parsing attributes in process `syz-executor0'. netlink: 60 bytes leftover after parsing attributes in process `syz-executor0'. SELinux: security_context_str_to_sid(root) failed for (dev bpf, type bpf) errno=-22 netlink: 60 bytes leftover after parsing attributes in process `syz-executor0'. SELinux: security_context_str_to_sid(root) failed for (dev bpf, type bpf) errno=-22 SELinux: security_context_str_to_sid(root) failed for (dev bpf, type bpf) errno=-22 netlink: 60 bytes leftover after parsing attributes in process `syz-executor0'. SELinux: security_context_str_to_sid(root) failed for (dev bpf, type bpf) errno=-22 netlink: 60 bytes leftover after parsing attributes in process `syz-executor0'. netlink: 60 bytes leftover after parsing attributes in process `syz-executor0'. netlink: 60 bytes leftover after parsing attributes in process `syz-executor0'. netlink: 60 bytes leftover after parsing attributes in process `syz-executor0'. netlink: 60 bytes leftover after parsing attributes in process `syz-executor0'. netlink: 60 bytes leftover after parsing attributes in process `syz-executor0'. netlink: 60 bytes leftover after parsing attributes in process `syz-executor0'. netlink: 60 bytes leftover after parsing attributes in process `syz-executor0'. netlink: 60 bytes leftover after parsing attributes in process `syz-executor0'. netlink: 60 bytes leftover after parsing attributes in process `syz-executor0'. netlink: 60 bytes leftover after parsing attributes in process `syz-executor0'. netlink: 8 bytes leftover after parsing attributes in process `syz-executor0'. netlink: 8 bytes leftover after parsing attributes in process `syz-executor0'. netlink: 8 bytes leftover after parsing attributes in process `syz-executor0'.