============================================
WARNING: possible recursive locking detected
4.16.0-rc4+ #271 Not tainted
--------------------------------------------
syz-executor2/8743 is trying to acquire lock:
(_xmit_ETHER#2){+.-.}, at: [<000000000a54b778>] spin_lock include/linux/spinlock.h:310 [inline]
(_xmit_ETHER#2){+.-.}, at: [<000000000a54b778>] __netif_tx_lock include/linux/netdevice.h:3573 [inline]
(_xmit_ETHER#2){+.-.}, at: [<000000000a54b778>] sch_direct_xmit+0x361/0x1140 net/sched/sch_generic.c:325
but task is already holding lock:
(_xmit_ETHER#2){+.-.}, at: [<000000000a54b778>] spin_lock include/linux/spinlock.h:310 [inline]
(_xmit_ETHER#2){+.-.}, at: [<000000000a54b778>] __netif_tx_lock include/linux/netdevice.h:3573 [inline]
(_xmit_ETHER#2){+.-.}, at: [<000000000a54b778>] sch_direct_xmit+0x361/0x1140 net/sched/sch_generic.c:325
other info that might help us debug this:
Possible unsafe locking scenario:
CPU0
----
lock(_xmit_ETHER#2);
lock(_xmit_ETHER#2);
*** DEADLOCK ***
May be due to missing lock nesting notation
11 locks held by syz-executor2/8743:
#0: (sk_lock-AF_INET6){+.+.}, at: [<00000000105bb3ed>] lock_sock include/net/sock.h:1464 [inline]
#0: (sk_lock-AF_INET6){+.+.}, at: [<00000000105bb3ed>] sctp_sendmsg+0xb3e/0x1ad0 net/sctp/socket.c:2027
#1: (rcu_read_lock){....}, at: [<0000000085ff0dfc>] read_pnet include/net/net_namespace.h:284 [inline]
#1: (rcu_read_lock){....}, at: [<0000000085ff0dfc>] sock_net include/net/sock.h:2297 [inline]
#1: (rcu_read_lock){....}, at: [<0000000085ff0dfc>] ip_queue_xmit+0x9e/0x18e0 net/ipv4/ip_output.c:429
#2: (rcu_read_lock_bh){....}, at: [<0000000080edc429>] lwtunnel_xmit_redirect include/net/lwtunnel.h:92 [inline]
#2: (rcu_read_lock_bh){....}, at: [<0000000080edc429>] ip_finish_output2+0x2aa/0x1550 net/ipv4/ip_output.c:213
#3: (rcu_read_lock_bh){....}, at: [<00000000d6aec87a>] __dev_queue_xmit+0x2f6/0x2f30 net/core/dev.c:3483
#4: (rcu_read_lock){....}, at: [<0000000045796e44>] is_netpoll_tx_blocked include/net/bonding.h:95 [inline]
#4: (rcu_read_lock){....}, at: [<0000000045796e44>] bond_start_xmit+0x135/0x1900 drivers/net/bonding/bond_main.c:4119
#5: (rcu_read_lock_bh){....}, at: [<00000000d6aec87a>] __dev_queue_xmit+0x2f6/0x2f30 net/core/dev.c:3483
#6: (_xmit_ETHER#2){+.-.}, at: [<000000000a54b778>] spin_lock include/linux/spinlock.h:310 [inline]
#6: (_xmit_ETHER#2){+.-.}, at: [<000000000a54b778>] __netif_tx_lock include/linux/netdevice.h:3573 [inline]
#6: (_xmit_ETHER#2){+.-.}, at: [<000000000a54b778>] sch_direct_xmit+0x361/0x1140 net/sched/sch_generic.c:325
#7: (rcu_read_lock_bh){....}, at: [<0000000080edc429>] lwtunnel_xmit_redirect include/net/lwtunnel.h:92 [inline]
#7: (rcu_read_lock_bh){....}, at: [<0000000080edc429>] ip_finish_output2+0x2aa/0x1550 net/ipv4/ip_output.c:213
#8: (rcu_read_lock_bh){....}, at: [<00000000d6aec87a>] __dev_queue_xmit+0x2f6/0x2f30 net/core/dev.c:3483
#9: (rcu_read_lock){....}, at: [<0000000045796e44>] is_netpoll_tx_blocked include/net/bonding.h:95 [inline]
#9: (rcu_read_lock){....}, at: [<0000000045796e44>] bond_start_xmit+0x135/0x1900 drivers/net/bonding/bond_main.c:4119
#10: (rcu_read_lock_bh){....}, at: [<00000000d6aec87a>] __dev_queue_xmit+0x2f6/0x2f30 net/core/dev.c:3483
stack backtrace:
CPU: 0 PID: 8743 Comm: syz-executor2 Not tainted 4.16.0-rc4+ #271
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+0x194/0x24d lib/dump_stack.c:53
print_deadlock_bug kernel/locking/lockdep.c:1761 [inline]
check_deadlock kernel/locking/lockdep.c:1805 [inline]
validate_chain kernel/locking/lockdep.c:2401 [inline]
__lock_acquire+0xe8f/0x3e00 kernel/locking/lockdep.c:3431
lock_acquire+0x1d5/0x580 kernel/locking/lockdep.c:3920
__raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline]
_raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:144
spin_lock include/linux/spinlock.h:310 [inline]
__netif_tx_lock include/linux/netdevice.h:3573 [inline]
sch_direct_xmit+0x361/0x1140 net/sched/sch_generic.c:325
qdisc_restart net/sched/sch_generic.c:393 [inline]
__qdisc_run+0x57d/0x19c0 net/sched/sch_generic.c:401
__dev_xmit_skb net/core/dev.c:3217 [inline]
__dev_queue_xmit+0xd5e/0x2f30 net/core/dev.c:3517
dev_queue_xmit+0x17/0x20 net/core/dev.c:3582
bond_dev_queue_xmit+0xf6/0x350 drivers/net/bonding/bond_main.c:255
bond_xmit_slave_id+0x1f2/0x570 drivers/net/bonding/bond_main.c:3755
bond_xmit_roundrobin drivers/net/bonding/bond_main.c:3832 [inline]
__bond_start_xmit drivers/net/bonding/bond_main.c:4090 [inline]
bond_start_xmit+0xbd4/0x1900 drivers/net/bonding/bond_main.c:4124
__netdev_start_xmit include/linux/netdevice.h:4078 [inline]
netdev_start_xmit include/linux/netdevice.h:4087 [inline]
xmit_one net/core/dev.c:3026 [inline]
dev_hard_start_xmit+0x24e/0xac0 net/core/dev.c:3042
__dev_queue_xmit+0x2637/0x2f30 net/core/dev.c:3549
dev_queue_xmit+0x17/0x20 net/core/dev.c:3582
neigh_hh_output include/net/neighbour.h:472 [inline]
neigh_output include/net/neighbour.h:480 [inline]
ip_finish_output2+0xf4d/0x1550 net/ipv4/ip_output.c:229
ip_finish_output+0x864/0xd10 net/ipv4/ip_output.c:317
NF_HOOK_COND include/linux/netfilter.h:277 [inline]
ip_mc_output+0x271/0x1350 net/ipv4/ip_output.c:390
dst_output include/net/dst.h:444 [inline]
ip_local_out+0x95/0x160 net/ipv4/ip_output.c:124
iptunnel_xmit+0x556/0x810 net/ipv4/ip_tunnel_core.c:91
ip_tunnel_xmit+0x177b/0x3550 net/ipv4/ip_tunnel.c:768
__gre_xmit+0x546/0x8b0 net/ipv4/ip_gre.c:449
erspan_xmit+0x779/0x22a0 net/ipv4/ip_gre.c:731
__netdev_start_xmit include/linux/netdevice.h:4078 [inline]
netdev_start_xmit include/linux/netdevice.h:4087 [inline]
xmit_one net/core/dev.c:3026 [inline]
dev_hard_start_xmit+0x24e/0xac0 net/core/dev.c:3042
sch_direct_xmit+0x40d/0x1140 net/sched/sch_generic.c:327
qdisc_restart net/sched/sch_generic.c:393 [inline]
__qdisc_run+0x57d/0x19c0 net/sched/sch_generic.c:401
__dev_xmit_skb net/core/dev.c:3217 [inline]
__dev_queue_xmit+0xd5e/0x2f30 net/core/dev.c:3517
dev_queue_xmit+0x17/0x20 net/core/dev.c:3582
bond_dev_queue_xmit+0xf6/0x350 drivers/net/bonding/bond_main.c:255
bond_xmit_slave_id+0x1f2/0x570 drivers/net/bonding/bond_main.c:3755
bond_xmit_roundrobin drivers/net/bonding/bond_main.c:3832 [inline]
__bond_start_xmit drivers/net/bonding/bond_main.c:4090 [inline]
bond_start_xmit+0xbd4/0x1900 drivers/net/bonding/bond_main.c:4124
__netdev_start_xmit include/linux/netdevice.h:4078 [inline]
netdev_start_xmit include/linux/netdevice.h:4087 [inline]
xmit_one net/core/dev.c:3026 [inline]
dev_hard_start_xmit+0x24e/0xac0 net/core/dev.c:3042
__dev_queue_xmit+0x2637/0x2f30 net/core/dev.c:3549
dev_queue_xmit+0x17/0x20 net/core/dev.c:3582
neigh_resolve_output+0x5e2/0xa00 net/core/neighbour.c:1350
neigh_output include/net/neighbour.h:482 [inline]
ip_finish_output2+0x91a/0x1550 net/ipv4/ip_output.c:229
ip_finish_output+0x864/0xd10 net/ipv4/ip_output.c:317
NF_HOOK_COND include/linux/netfilter.h:277 [inline]
ip_mc_output+0x271/0x1350 net/ipv4/ip_output.c:390
dst_output include/net/dst.h:444 [inline]
ip_local_out+0x95/0x160 net/ipv4/ip_output.c:124
ip_queue_xmit+0x8c0/0x18e0 net/ipv4/ip_output.c:504
sctp_v4_xmit+0x108/0x140 net/sctp/protocol.c:942
sctp_packet_transmit+0x22a5/0x37c0 net/sctp/output.c:642
sctp_outq_flush+0xabb/0x4060 net/sctp/outqueue.c:911
sctp_outq_uncork+0x5a/0x70 net/sctp/outqueue.c:776
sctp_cmd_interpreter net/sctp/sm_sideeffect.c:1820 [inline]
sctp_side_effects net/sctp/sm_sideeffect.c:1220 [inline]
sctp_do_sm+0x4e0/0x7040 net/sctp/sm_sideeffect.c:1191
sctp_primitive_ASSOCIATE+0x9d/0xd0 net/sctp/primitive.c:88
sctp_sendmsg_to_asoc+0x14bf/0x1ec0 net/sctp/socket.c:1900
sctp_sendmsg+0xc50/0x1ad0 net/sctp/socket.c:2088
inet_sendmsg+0x11f/0x5e0 net/ipv4/af_inet.c:763
sock_sendmsg_nosec net/socket.c:629 [inline]
sock_sendmsg+0xca/0x110 net/socket.c:639
___sys_sendmsg+0x320/0x8b0 net/socket.c:2047
__sys_sendmmsg+0x1ee/0x620 net/socket.c:2137
SYSC_sendmmsg net/socket.c:2168 [inline]
SyS_sendmmsg+0x35/0x60 net/socket.c:2163
do_syscall_64+0x281/0x940 arch/x86/entry/common.c:287
entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x453e69
RSP: 002b:00007f6a354c8c68 EFLAGS: 00000246 ORIG_RAX: 0000000000000133
RAX: ffffffffffffffda RBX: 00007f6a354c96d4 RCX: 0000000000453e69
RDX: 0000000000000001 RSI: 0000000020003580 RDI: 0000000000000013
RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000044040 R11: 0000000000000246 R12: 00000000ffffffff
R13: 00000000000004b4 R14: 00000000006f7180 R15: 0000000000000000