============================================
WARNING: possible recursive locking detected
4.16.0-rc2+ #327 Not tainted
--------------------------------------------
syz-executor3/5678 is trying to acquire lock:
(_xmit_ETHER#2){+.-.}, at: [<00000000b3c15b13>] spin_lock include/linux/spinlock.h:310 [inline]
(_xmit_ETHER#2){+.-.}, at: [<00000000b3c15b13>] __netif_tx_lock include/linux/netdevice.h:3561 [inline]
(_xmit_ETHER#2){+.-.}, at: [<00000000b3c15b13>] sch_direct_xmit+0x361/0x1140 net/sched/sch_generic.c:325
but task is already holding lock:
(_xmit_ETHER#2){+.-.}, at: [<00000000b3c15b13>] spin_lock include/linux/spinlock.h:310 [inline]
(_xmit_ETHER#2){+.-.}, at: [<00000000b3c15b13>] __netif_tx_lock include/linux/netdevice.h:3561 [inline]
(_xmit_ETHER#2){+.-.}, at: [<00000000b3c15b13>] 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
12 locks held by syz-executor3/5678:
#0: (sk_lock-AF_INET6){+.+.}, at: [<00000000356f6e21>] lock_sock include/net/sock.h:1463 [inline]
#0: (sk_lock-AF_INET6){+.+.}, at: [<00000000356f6e21>] rawv6_sendmsg+0x1d86/0x40c0 net/ipv6/raw.c:927
#1: (rcu_read_lock){....}, at: [<00000000a8a8b592>] nf_hook include/linux/netfilter.h:206 [inline]
#1: (rcu_read_lock){....}, at: [<00000000a8a8b592>] __ip6_local_out+0x2f1/0xaa0 net/ipv6/output_core.c:164
#2: (rcu_read_lock_bh){....}, at: [<00000000793cd3f8>] lwtunnel_xmit_redirect include/net/lwtunnel.h:92 [inline]
#2: (rcu_read_lock_bh){....}, at: [<00000000793cd3f8>] ip6_finish_output2+0x23d/0x23a0 net/ipv6/ip6_output.c:106
#3: (rcu_read_lock_bh){....}, at: [<000000002bb15e02>] __dev_queue_xmit+0x2f6/0x2f30 net/core/dev.c:3483
#4: (_xmit_ETHER#2){+.-.}, at: [<00000000b3c15b13>] spin_lock include/linux/spinlock.h:310 [inline]
#4: (_xmit_ETHER#2){+.-.}, at: [<00000000b3c15b13>] __netif_tx_lock include/linux/netdevice.h:3561 [inline]
#4: (_xmit_ETHER#2){+.-.}, at: [<00000000b3c15b13>] sch_direct_xmit+0x361/0x1140 net/sched/sch_generic.c:325
#5: (rcu_read_lock){....}, at: [<0000000033654dd0>] icmpv6_send+0x0/0x280 net/ipv6/ip6_icmp.c:31
#6: (k-slock-AF_INET6){+...}, at: [<00000000d37e4909>] spin_trylock include/linux/spinlock.h:320 [inline]
#6: (k-slock-AF_INET6){+...}, at: [<00000000d37e4909>] icmpv6_xmit_lock net/ipv6/icmp.c:119 [inline]
#6: (k-slock-AF_INET6){+...}, at: [<00000000d37e4909>] icmp6_send+0x1250/0x2bb0 net/ipv6/icmp.c:528
#7: (rcu_read_lock){....}, at: [<00000000b87301fd>] icmp6_send+0x1d37/0x2bb0 net/ipv6/icmp.c:563
#8: (rcu_read_lock_bh){....}, at: [<00000000793cd3f8>] lwtunnel_xmit_redirect include/net/lwtunnel.h:92 [inline]
#8: (rcu_read_lock_bh){....}, at: [<00000000793cd3f8>] ip6_finish_output2+0x23d/0x23a0 net/ipv6/ip6_output.c:106
#9: (rcu_read_lock){....}, at: [<000000002d93ff81>] ip6_nd_hdr net/ipv6/ndisc.c:449 [inline]
#9: (rcu_read_lock){....}, at: [<000000002d93ff81>] ndisc_send_skb+0x826/0x1370 net/ipv6/ndisc.c:485
#10: (rcu_read_lock_bh){....}, at: [<00000000793cd3f8>] lwtunnel_xmit_redirect include/net/lwtunnel.h:92 [inline]
#10: (rcu_read_lock_bh){....}, at: [<00000000793cd3f8>] ip6_finish_output2+0x23d/0x23a0 net/ipv6/ip6_output.c:106
#11: (rcu_read_lock_bh){....}, at: [<000000002bb15e02>] __dev_queue_xmit+0x2f6/0x2f30 net/core/dev.c:3483
stack backtrace:
CPU: 0 PID: 5678 Comm: syz-executor3 Not tainted 4.16.0-rc2+ #327
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:3561 [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
neigh_hh_output include/net/neighbour.h:472 [inline]
neigh_output include/net/neighbour.h:480 [inline]
ip6_finish_output2+0x1492/0x23a0 net/ipv6/ip6_output.c:120
ip6_finish_output+0x69b/0xaf0 net/ipv6/ip6_output.c:154
NF_HOOK_COND include/linux/netfilter.h:277 [inline]
ip6_output+0x1eb/0x840 net/ipv6/ip6_output.c:171
dst_output include/net/dst.h:443 [inline]
NF_HOOK include/linux/netfilter.h:288 [inline]
ndisc_send_skb+0xac4/0x1370 net/ipv6/ndisc.c:491
ndisc_send_ns+0x38a/0x870 net/ipv6/ndisc.c:633
ndisc_solicit+0x383/0x5c0 net/ipv6/ndisc.c:725
neigh_probe+0xc3/0x100 net/core/neighbour.c:899
__neigh_event_send+0x927/0x1040 net/core/neighbour.c:1055
neigh_event_send include/net/neighbour.h:435 [inline]
neigh_resolve_output+0x62b/0xa00 net/core/neighbour.c:1334
neigh_output include/net/neighbour.h:482 [inline]
ip6_finish_output2+0xb4a/0x23a0 net/ipv6/ip6_output.c:120
ip6_finish_output+0x69b/0xaf0 net/ipv6/ip6_output.c:154
NF_HOOK_COND include/linux/netfilter.h:277 [inline]
ip6_output+0x1eb/0x840 net/ipv6/ip6_output.c:171
dst_output include/net/dst.h:443 [inline]
ip6_local_out+0x95/0x160 net/ipv6/output_core.c:176
ip6_send_skb+0xa1/0x330 net/ipv6/ip6_output.c:1677
ip6_push_pending_frames+0xb3/0xe0 net/ipv6/ip6_output.c:1697
icmpv6_push_pending_frames+0x338/0x520 net/ipv6/icmp.c:288
icmp6_send+0x2244/0x2bb0 net/ipv6/icmp.c:582
icmpv6_send+0x142/0x280 net/ipv6/ip6_icmp.c:43
ip6_link_failure+0x94/0x570 net/ipv6/route.c:2005
dst_link_failure include/net/dst.h:426 [inline]
ip_tunnel_xmit+0x2ada/0x37d0 net/ipv4/ip_tunnel.c:798
__gre_xmit+0x546/0x8b0 net/ipv4/ip_gre.c:449
erspan_xmit+0x779/0x22b0 net/ipv4/ip_gre.c:728
__netdev_start_xmit include/linux/netdevice.h:4066 [inline]
netdev_start_xmit include/linux/netdevice.h:4075 [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
neigh_resolve_output+0x5e2/0xa00 net/core/neighbour.c:1350
neigh_output include/net/neighbour.h:482 [inline]
ip6_finish_output2+0xb4a/0x23a0 net/ipv6/ip6_output.c:120
ip6_finish_output+0x69b/0xaf0 net/ipv6/ip6_output.c:154
NF_HOOK_COND include/linux/netfilter.h:277 [inline]
ip6_output+0x1eb/0x840 net/ipv6/ip6_output.c:171
dst_output include/net/dst.h:443 [inline]
ip6_local_out+0x95/0x160 net/ipv6/output_core.c:176
nf_dup_ipv6+0x66d/0x8c0 net/ipv6/netfilter/nf_dup_ipv6.c:70
tee_tg6+0x10e/0x170 net/netfilter/xt_TEE.c:48
ip6t_do_table+0xc2a/0x1aa0 net/ipv6/netfilter/ip6_tables.c:369
ip6table_raw_hook+0x65/0x80 net/ipv6/netfilter/ip6table_raw.c:42
nf_hook_entry_hookfn include/linux/netfilter.h:120 [inline]
nf_hook_slow+0xba/0x1a0 net/netfilter/core.c:483
nf_hook include/linux/netfilter.h:243 [inline]
__ip6_local_out+0x517/0xaa0 net/ipv6/output_core.c:164
ip6_local_out+0x2d/0x160 net/ipv6/output_core.c:174
ip6_send_skb+0xa1/0x330 net/ipv6/ip6_output.c:1677
ip6_push_pending_frames+0xb3/0xe0 net/ipv6/ip6_output.c:1697
rawv6_push_pending_frames net/ipv6/raw.c:616 [inline]
rawv6_sendmsg+0x2f96/0x40c0 net/ipv6/raw.c:935
inet_sendmsg+0x11f/0x5e0 net/ipv4/af_inet.c:764
sock_sendmsg_nosec net/socket.c:630 [inline]
sock_sendmsg+0xca/0x110 net/socket.c:640
___sys_sendmsg+0x767/0x8b0 net/socket.c:2046
__sys_sendmsg+0xe5/0x210 net/socket.c:2080
SYSC_sendmsg net/socket.c:2091 [inline]
SyS_sendmsg+0x2d/0x50 net/socket.c:2087
do_syscall_64+0x280/0x940 arch/x86/entry/common.c:287
entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x453de9
RSP: 002b:00007fb3e5f40c68 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007fb3e5f416d4 RCX: 0000000000453de9
RDX: 0000000000000000 RSI: 000000002001f000 RDI: 0000000000000013
RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 00000000000004a6 R14: 00000000006f7030 R15: 0000000000000000