======================================================
WARNING: possible circular locking dependency detected
6.8.0-rc4-syzkaller-00005-gc664e16bb1ba #0 Not tainted
------------------------------------------------------
syz-executor.0/22848 is trying to acquire lock:
ffff888023e64218 (dev->qdisc_tx_busylock ?: &qdisc_tx_busylock){+.-.}-{2:2}, at: spin_lock include/linux/spinlock.h:351 [inline]
ffff888023e64218 (dev->qdisc_tx_busylock ?: &qdisc_tx_busylock){+.-.}-{2:2}, at: __dev_xmit_skb net/core/dev.c:3806 [inline]
ffff888023e64218 (dev->qdisc_tx_busylock ?: &qdisc_tx_busylock){+.-.}-{2:2}, at: __dev_queue_xmit+0x2f94/0x3ee0 net/core/dev.c:4317
but task is already holding lock:
ffff888027f738d8 (_xmit_ETHER#2){+.-.}-{2:2}, at: spin_lock include/linux/spinlock.h:351 [inline]
ffff888027f738d8 (_xmit_ETHER#2){+.-.}-{2:2}, at: __netif_tx_lock include/linux/netdevice.h:4452 [inline]
ffff888027f738d8 (_xmit_ETHER#2){+.-.}-{2:2}, at: sch_direct_xmit+0x337/0xc20 net/sched/sch_generic.c:340
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #1 (_xmit_ETHER#2){+.-.}-{2:2}:
__raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline]
_raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:154
spin_lock include/linux/spinlock.h:351 [inline]
__netif_tx_lock include/linux/netdevice.h:4452 [inline]
sch_direct_xmit+0x337/0xc20 net/sched/sch_generic.c:340
__dev_xmit_skb net/core/dev.c:3776 [inline]
__dev_queue_xmit+0x12b4/0x3ee0 net/core/dev.c:4317
lapb_data_transmit+0x93/0xc0 net/lapb/lapb_iface.c:447
lapb_transmit_buffer+0xce/0x390 net/lapb/lapb_out.c:149
lapb_send_control+0x1c8/0x320 net/lapb/lapb_subr.c:251
lapb_establish_data_link+0xeb/0x110 net/lapb/lapb_out.c:163
lapb_device_event+0x3ae/0x580 net/lapb/lapb_iface.c:512
notifier_call_chain+0xb9/0x3c0 kernel/notifier.c:93
call_netdevice_notifiers_info+0xbe/0x140 net/core/dev.c:1966
call_netdevice_notifiers_extack net/core/dev.c:2004 [inline]
call_netdevice_notifiers net/core/dev.c:2018 [inline]
__dev_notify_flags+0x12d/0x2e0 net/core/dev.c:8687
dev_change_flags+0x10c/0x160 net/core/dev.c:8725
devinet_ioctl+0x13f3/0x1f20 net/ipv4/devinet.c:1167
inet_ioctl+0x3aa/0x3f0 net/ipv4/af_inet.c:1000
sock_do_ioctl+0x116/0x280 net/socket.c:1222
sock_ioctl+0x22e/0x6c0 net/socket.c:1341
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:871 [inline]
__se_sys_ioctl fs/ioctl.c:857 [inline]
__x64_sys_ioctl+0x193/0x220 fs/ioctl.c:857
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xd5/0x270 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x6f/0x77
-> #0 (dev->qdisc_tx_busylock ?: &qdisc_tx_busylock){+.-.}-{2:2}:
check_prev_add kernel/locking/lockdep.c:3134 [inline]
check_prevs_add kernel/locking/lockdep.c:3253 [inline]
validate_chain kernel/locking/lockdep.c:3869 [inline]
__lock_acquire+0x244f/0x3b40 kernel/locking/lockdep.c:5137
lock_acquire kernel/locking/lockdep.c:5754 [inline]
lock_acquire+0x1ae/0x520 kernel/locking/lockdep.c:5719
__raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline]
_raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:154
spin_lock include/linux/spinlock.h:351 [inline]
__dev_xmit_skb net/core/dev.c:3806 [inline]
__dev_queue_xmit+0x2f94/0x3ee0 net/core/dev.c:4317
dev_queue_xmit include/linux/netdevice.h:3171 [inline]
neigh_resolve_output net/core/neighbour.c:1563 [inline]
neigh_resolve_output+0x587/0x900 net/core/neighbour.c:1543
neigh_output include/net/neighbour.h:542 [inline]
ip6_finish_output2+0x673/0x1830 net/ipv6/ip6_output.c:137
__ip6_finish_output net/ipv6/ip6_output.c:211 [inline]
ip6_finish_output+0x3f9/0x1300 net/ipv6/ip6_output.c:222
NF_HOOK_COND include/linux/netfilter.h:303 [inline]
ip6_output+0x1e2/0x530 net/ipv6/ip6_output.c:243
dst_output include/net/dst.h:451 [inline]
NF_HOOK include/linux/netfilter.h:314 [inline]
ndisc_send_skb+0xa2d/0x1c30 net/ipv6/ndisc.c:509
ndisc_send_ns+0xc7/0x150 net/ipv6/ndisc.c:667
ndisc_solicit+0x2f7/0x510 net/ipv6/ndisc.c:759
neigh_probe+0xc2/0x110 net/core/neighbour.c:1075
__neigh_event_send+0xa54/0x1320 net/core/neighbour.c:1242
neigh_event_send_probe include/net/neighbour.h:466 [inline]
neigh_event_send include/net/neighbour.h:472 [inline]
neigh_event_send include/net/neighbour.h:470 [inline]
neigh_resolve_output+0x5b8/0x900 net/core/neighbour.c:1547
neigh_output include/net/neighbour.h:542 [inline]
ip6_finish_output2+0x673/0x1830 net/ipv6/ip6_output.c:137
__ip6_finish_output net/ipv6/ip6_output.c:211 [inline]
ip6_finish_output+0x3f9/0x1300 net/ipv6/ip6_output.c:222
NF_HOOK_COND include/linux/netfilter.h:303 [inline]
ip6_output+0x1e2/0x530 net/ipv6/ip6_output.c:243
dst_output include/net/dst.h:451 [inline]
ip6_local_out+0xcd/0x4a0 net/ipv6/output_core.c:155
ip6_send_skb+0xcd/0x2d0 net/ipv6/ip6_output.c:1952
ip6_push_pending_frames+0xe0/0x110 net/ipv6/ip6_output.c:1972
icmpv6_push_pending_frames+0x2da/0x470 net/ipv6/icmp.c:307
icmp6_send+0x1d95/0x2b00 net/ipv6/icmp.c:624
__icmpv6_send include/linux/icmpv6.h:28 [inline]
icmpv6_send include/linux/icmpv6.h:49 [inline]
ip6_link_failure+0x31/0x5a0 net/ipv6/route.c:2787
dst_link_failure include/net/dst.h:430 [inline]
ip_tunnel_xmit+0x2d87/0x33d0 net/ipv4/ip_tunnel.c:837
erspan_xmit+0x523/0x1bf0 net/ipv4/ip_gre.c:720
__netdev_start_xmit include/linux/netdevice.h:4989 [inline]
netdev_start_xmit include/linux/netdevice.h:5003 [inline]
xmit_one net/core/dev.c:3547 [inline]
dev_hard_start_xmit+0x13a/0x6d0 net/core/dev.c:3563
sch_direct_xmit+0x1ac/0xc20 net/sched/sch_generic.c:342
qdisc_restart net/sched/sch_generic.c:407 [inline]
__qdisc_run+0x54d/0x1a20 net/sched/sch_generic.c:415
__dev_xmit_skb net/core/dev.c:3839 [inline]
__dev_queue_xmit+0x2504/0x3ee0 net/core/dev.c:4317
dev_queue_xmit include/linux/netdevice.h:3171 [inline]
br_dev_queue_push_xmit+0x272/0x7c0 net/bridge/br_forward.c:53
NF_HOOK include/linux/netfilter.h:314 [inline]
NF_HOOK include/linux/netfilter.h:308 [inline]
br_forward_finish+0xf5/0x130 net/bridge/br_forward.c:66
NF_HOOK include/linux/netfilter.h:314 [inline]
NF_HOOK include/linux/netfilter.h:308 [inline]
__br_forward+0x1e5/0x5b0 net/bridge/br_forward.c:115
deliver_clone+0x5b/0xa0 net/bridge/br_forward.c:131
maybe_deliver+0x31a/0x3e0 net/bridge/br_forward.c:190
br_flood+0x17e/0x5c0 net/bridge/br_forward.c:236
br_dev_xmit+0x1365/0x1740 net/bridge/br_device.c:104
__netdev_start_xmit include/linux/netdevice.h:4989 [inline]
netdev_start_xmit include/linux/netdevice.h:5003 [inline]
xmit_one net/core/dev.c:3547 [inline]
dev_hard_start_xmit+0x13a/0x6d0 net/core/dev.c:3563
__dev_queue_xmit+0x7b6/0x3ee0 net/core/dev.c:4351
dev_queue_xmit include/linux/netdevice.h:3171 [inline]
neigh_resolve_output net/core/neighbour.c:1563 [inline]
neigh_resolve_output+0x587/0x900 net/core/neighbour.c:1543
__neigh_update+0xb57/0x2b90 net/core/neighbour.c:1461
ndisc_update net/ipv6/ndisc.c:782 [inline]
ndisc_recv_na+0xac6/0x1150 net/ipv6/ndisc.c:1109
ndisc_rcv+0x509/0x5f0 net/ipv6/ndisc.c:1848
icmpv6_rcv+0x13f8/0x19b0 net/ipv6/icmp.c:979
ip6_protocol_deliver_rcu+0xee2/0x1430 net/ipv6/ip6_input.c:438
ip6_input_finish+0x14f/0x2f0 net/ipv6/ip6_input.c:483
NF_HOOK include/linux/netfilter.h:314 [inline]
NF_HOOK include/linux/netfilter.h:308 [inline]
ip6_input+0xa1/0xd0 net/ipv6/ip6_input.c:492
dst_input include/net/dst.h:461 [inline]
ip6_rcv_finish+0x1ad/0x5b0 net/ipv6/ip6_input.c:79
ip_sabotage_in+0x21e/0x2a0 net/bridge/br_netfilter_hooks.c:901
nf_hook_entry_hookfn include/linux/netfilter.h:154 [inline]
nf_hook_slow+0xbb/0x200 net/netfilter/core.c:626
nf_hook.constprop.0+0x42f/0x750 include/linux/netfilter.h:269
NF_HOOK include/linux/netfilter.h:312 [inline]
ipv6_rcv+0xa4/0x680 net/ipv6/ip6_input.c:310
__netif_receive_skb_one_core+0x12e/0x1e0 net/core/dev.c:5534
__netif_receive_skb+0x1f/0x1c0 net/core/dev.c:5648
netif_receive_skb_internal net/core/dev.c:5734 [inline]
netif_receive_skb+0x133/0x710 net/core/dev.c:5793
NF_HOOK include/linux/netfilter.h:314 [inline]
NF_HOOK include/linux/netfilter.h:308 [inline]
br_pass_frame_up+0x2fe/0x420 net/bridge/br_input.c:68
br_handle_frame_finish+0xdb2/0x1c40 net/bridge/br_input.c:216
br_nf_hook_thresh+0x303/0x410 net/bridge/br_netfilter_hooks.c:1070
br_nf_pre_routing_finish_ipv6+0x76a/0xfb0 net/bridge/br_netfilter_ipv6.c:154
NF_HOOK include/linux/netfilter.h:314 [inline]
br_nf_pre_routing_ipv6+0x3ce/0x8c0 net/bridge/br_netfilter_ipv6.c:184
br_nf_pre_routing+0x85e/0x15a0 net/bridge/br_netfilter_hooks.c:523
nf_hook_entry_hookfn include/linux/netfilter.h:154 [inline]
nf_hook_bridge_pre net/bridge/br_input.c:272 [inline]
br_handle_frame+0x9e9/0x1450 net/bridge/br_input.c:417
__netif_receive_skb_core.constprop.0+0x9fd/0x3f80 net/core/dev.c:5428
__netif_receive_skb_one_core+0xb1/0x1e0 net/core/dev.c:5532
__netif_receive_skb+0x1f/0x1c0 net/core/dev.c:5648
process_backlog+0x101/0x6b0 net/core/dev.c:5976
__napi_poll.constprop.0+0xb7/0x550 net/core/dev.c:6576
napi_poll net/core/dev.c:6645 [inline]
net_rx_action+0x95a/0xe90 net/core/dev.c:6778
__do_softirq+0x21c/0x8e7 kernel/softirq.c:553
do_softirq kernel/softirq.c:454 [inline]
do_softirq+0xb2/0xf0 kernel/softirq.c:441
__local_bh_enable_ip+0x100/0x120 kernel/softirq.c:381
local_bh_enable include/linux/bottom_half.h:33 [inline]
__neigh_event_send+0x31c/0x1320 net/core/neighbour.c:1245
neigh_event_send_probe include/net/neighbour.h:466 [inline]
neigh_event_send include/net/neighbour.h:472 [inline]
neigh_event_send include/net/neighbour.h:470 [inline]
neigh_resolve_output+0x5b8/0x900 net/core/neighbour.c:1547
neigh_output include/net/neighbour.h:542 [inline]
ip6_finish_output2+0x673/0x1830 net/ipv6/ip6_output.c:137
__ip6_finish_output net/ipv6/ip6_output.c:211 [inline]
ip6_finish_output+0x3f9/0x1300 net/ipv6/ip6_output.c:222
NF_HOOK_COND include/linux/netfilter.h:303 [inline]
ip6_output+0x1e2/0x530 net/ipv6/ip6_output.c:243
dst_output include/net/dst.h:451 [inline]
NF_HOOK include/linux/netfilter.h:314 [inline]
NF_HOOK include/linux/netfilter.h:308 [inline]
ip6_xmit+0x125f/0x2030 net/ipv6/ip6_output.c:358
inet6_csk_xmit+0x3ce/0x740 net/ipv6/inet6_connection_sock.c:135
__tcp_transmit_skb+0x1ada/0x3db0 net/ipv4/tcp_output.c:1462
tcp_transmit_skb net/ipv4/tcp_output.c:1480 [inline]
tcp_connect+0x3505/0x5230 net/ipv4/tcp_output.c:4100
tcp_v6_connect+0x1570/0x20f0 net/ipv6/tcp_ipv6.c:332
__inet_stream_connect+0x3d0/0x1040 net/ipv4/af_inet.c:678
inet_stream_connect+0x57/0xa0 net/ipv4/af_inet.c:749
__sys_connect_file+0x15f/0x1a0 net/socket.c:2048
__sys_connect+0x149/0x170 net/socket.c:2065
__do_sys_connect net/socket.c:2075 [inline]
__se_sys_connect net/socket.c:2072 [inline]
__x64_sys_connect+0x72/0xb0 net/socket.c:2072
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xd5/0x270 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x6f/0x77
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 ***
18 locks held by syz-executor.0/22848:
#0: ffff888056c86930 (sk_lock-AF_INET6){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1691 [inline]
#0: ffff888056c86930 (sk_lock-AF_INET6){+.+.}-{0:0}, at: inet_stream_connect+0x43/0xa0 net/ipv4/af_inet.c:748
#1: ffffffff8d7ad160 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:298 [inline]
#1: ffffffff8d7ad160 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:750 [inline]
#1: ffffffff8d7ad160 (rcu_read_lock){....}-{1:2}, at: inet6_csk_xmit+0x18a/0x740 net/ipv6/inet6_connection_sock.c:129
#2: ffffffff8d7ad160 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:298 [inline]
#2: ffffffff8d7ad160 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:750 [inline]
#2: ffffffff8d7ad160 (rcu_read_lock){....}-{1:2}, at: ip6_finish_output2+0x3b4/0x1830 net/ipv6/ip6_output.c:122
#3: ffffffff8d7ad160 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:298 [inline]
#3: ffffffff8d7ad160 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:750 [inline]
#3: ffffffff8d7ad160 (rcu_read_lock){....}-{1:2}, at: process_backlog+0x25d/0x6b0 net/core/dev.c:5975
#4: ffffffff8d7ad160 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:298 [inline]
#4: ffffffff8d7ad160 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:750 [inline]
#4: ffffffff8d7ad160 (rcu_read_lock){....}-{1:2}, at: netif_receive_skb_internal net/core/dev.c:5721 [inline]
#4: ffffffff8d7ad160 (rcu_read_lock){....}-{1:2}, at: netif_receive_skb+0xfd/0x710 net/core/dev.c:5793
#5: ffffffff8d7ad160 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:298 [inline]
#5: ffffffff8d7ad160 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:750 [inline]
#5: ffffffff8d7ad160 (rcu_read_lock){....}-{1:2}, at: nf_hook.constprop.0+0xa4/0x750 include/linux/netfilter.h:238
#6: ffffffff8d7ad160 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:298 [inline]
#6: ffffffff8d7ad160 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:750 [inline]
#6: ffffffff8d7ad160 (rcu_read_lock){....}-{1:2}, at: ip6_input_finish+0x11c/0x2f0 net/ipv6/ip6_input.c:482
#7: ffffffff8d7ad160 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:298 [inline]
#7: ffffffff8d7ad160 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:750 [inline]
#7: ffffffff8d7ad160 (rcu_read_lock){....}-{1:2}, at: __neigh_update+0xa20/0x2b90 net/core/neighbour.c:1446
#8: ffffffff8d7ad100 (rcu_read_lock_bh){....}-{1:2}, at: local_bh_disable include/linux/bottom_half.h:20 [inline]
#8: ffffffff8d7ad100 (rcu_read_lock_bh){....}-{1:2}, at: rcu_read_lock_bh include/linux/rcupdate.h:802 [inline]
#8: ffffffff8d7ad100 (rcu_read_lock_bh){....}-{1:2}, at: __dev_queue_xmit+0x244/0x3ee0 net/core/dev.c:4276
#9: ffffffff8d7ad160 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:298 [inline]
#9: ffffffff8d7ad160 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:750 [inline]
#9: ffffffff8d7ad160 (rcu_read_lock){....}-{1:2}, at: br_dev_xmit+0x109/0x1740 net/bridge/br_device.c:44
#10: ffffffff8d7ad100 (rcu_read_lock_bh){....}-{1:2}, at: local_bh_disable include/linux/bottom_half.h:20 [inline]
#10: ffffffff8d7ad100 (rcu_read_lock_bh){....}-{1:2}, at: rcu_read_lock_bh include/linux/rcupdate.h:802 [inline]
#10: ffffffff8d7ad100 (rcu_read_lock_bh){....}-{1:2}, at: __dev_queue_xmit+0x244/0x3ee0 net/core/dev.c:4276
#11: ffff888027f738d8 (_xmit_ETHER#2){+.-.}-{2:2}, at: spin_lock include/linux/spinlock.h:351 [inline]
#11: ffff888027f738d8 (_xmit_ETHER#2){+.-.}-{2:2}, at: __netif_tx_lock include/linux/netdevice.h:4452 [inline]
#11: ffff888027f738d8 (_xmit_ETHER#2){+.-.}-{2:2}, at: sch_direct_xmit+0x337/0xc20 net/sched/sch_generic.c:340
#12: ffff888015f40f30 (k-slock-AF_INET6){+.-.}-{2:2}, at: spin_trylock include/linux/spinlock.h:361 [inline]
#12: ffff888015f40f30 (k-slock-AF_INET6){+.-.}-{2:2}, at: icmpv6_xmit_lock net/ipv6/icmp.c:108 [inline]
#12: ffff888015f40f30 (k-slock-AF_INET6){+.-.}-{2:2}, at: icmp6_send+0xfb8/0x2b00 net/ipv6/icmp.c:545
#13: ffffffff8d7ad160 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:298 [inline]
#13: ffffffff8d7ad160 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:750 [inline]
#13: ffffffff8d7ad160 (rcu_read_lock){....}-{1:2}, at: icmp6_send+0x16de/0x2b00 net/ipv6/icmp.c:613
#14: ffffffff8d7ad160 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:298 [inline]
#14: ffffffff8d7ad160 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:750 [inline]
#14: ffffffff8d7ad160 (rcu_read_lock){....}-{1:2}, at: ip6_finish_output2+0x3b4/0x1830 net/ipv6/ip6_output.c:122
#15: ffffffff8d7ad160 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:298 [inline]
#15: ffffffff8d7ad160 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:750 [inline]
#15: ffffffff8d7ad160 (rcu_read_lock){....}-{1:2}, at: ndisc_send_skb+0x864/0x1c30 net/ipv6/ndisc.c:505
#16: ffffffff8d7ad160 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:298 [inline]
#16: ffffffff8d7ad160 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:750 [inline]
#16: ffffffff8d7ad160 (rcu_read_lock){....}-{1:2}, at: ip6_finish_output2+0x3b4/0x1830 net/ipv6/ip6_output.c:122
#17: ffffffff8d7ad100 (rcu_read_lock_bh){....}-{1:2}, at: local_bh_disable include/linux/bottom_half.h:20 [inline]
#17: ffffffff8d7ad100 (rcu_read_lock_bh){....}-{1:2}, at: rcu_read_lock_bh include/linux/rcupdate.h:802 [inline]
#17: ffffffff8d7ad100 (rcu_read_lock_bh){....}-{1:2}, at: __dev_queue_xmit+0x244/0x3ee0 net/core/dev.c:4276
stack backtrace:
CPU: 2 PID: 22848 Comm: syz-executor.0 Not tainted 6.8.0-rc4-syzkaller-00005-gc664e16bb1ba #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
Call Trace:
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0xd9/0x1b0 lib/dump_stack.c:106
check_noncircular+0x31b/0x400 kernel/locking/lockdep.c:2187
check_prev_add kernel/locking/lockdep.c:3134 [inline]
check_prevs_add kernel/locking/lockdep.c:3253 [inline]
validate_chain kernel/locking/lockdep.c:3869 [inline]
__lock_acquire+0x244f/0x3b40 kernel/locking/lockdep.c:5137
lock_acquire kernel/locking/lockdep.c:5754 [inline]
lock_acquire+0x1ae/0x520 kernel/locking/lockdep.c:5719
__raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline]
_raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:154
spin_lock include/linux/spinlock.h:351 [inline]
__dev_xmit_skb net/core/dev.c:3806 [inline]
__dev_queue_xmit+0x2f94/0x3ee0 net/core/dev.c:4317
dev_queue_xmit include/linux/netdevice.h:3171 [inline]
neigh_resolve_output net/core/neighbour.c:1563 [inline]
neigh_resolve_output+0x587/0x900 net/core/neighbour.c:1543
neigh_output include/net/neighbour.h:542 [inline]
ip6_finish_output2+0x673/0x1830 net/ipv6/ip6_output.c:137
__ip6_finish_output net/ipv6/ip6_output.c:211 [inline]
ip6_finish_output+0x3f9/0x1300 net/ipv6/ip6_output.c:222
NF_HOOK_COND include/linux/netfilter.h:303 [inline]
ip6_output+0x1e2/0x530 net/ipv6/ip6_output.c:243
dst_output include/net/dst.h:451 [inline]
NF_HOOK include/linux/netfilter.h:314 [inline]
ndisc_send_skb+0xa2d/0x1c30 net/ipv6/ndisc.c:509
ndisc_send_ns+0xc7/0x150 net/ipv6/ndisc.c:667
ndisc_solicit+0x2f7/0x510 net/ipv6/ndisc.c:759
neigh_probe+0xc2/0x110 net/core/neighbour.c:1075
__neigh_event_send+0xa54/0x1320 net/core/neighbour.c:1242
neigh_event_send_probe include/net/neighbour.h:466 [inline]
neigh_event_send include/net/neighbour.h:472 [inline]
neigh_event_send include/net/neighbour.h:470 [inline]
neigh_resolve_output+0x5b8/0x900 net/core/neighbour.c:1547
neigh_output include/net/neighbour.h:542 [inline]
ip6_finish_output2+0x673/0x1830 net/ipv6/ip6_output.c:137
__ip6_finish_output net/ipv6/ip6_output.c:211 [inline]
ip6_finish_output+0x3f9/0x1300 net/ipv6/ip6_output.c:222
NF_HOOK_COND include/linux/netfilter.h:303 [inline]
ip6_output+0x1e2/0x530 net/ipv6/ip6_output.c:243
dst_output include/net/dst.h:451 [inline]
ip6_local_out+0xcd/0x4a0 net/ipv6/output_core.c:155
ip6_send_skb+0xcd/0x2d0 net/ipv6/ip6_output.c:1952
ip6_push_pending_frames+0xe0/0x110 net/ipv6/ip6_output.c:1972
icmpv6_push_pending_frames+0x2da/0x470 net/ipv6/icmp.c:307
icmp6_send+0x1d95/0x2b00 net/ipv6/icmp.c:624
__icmpv6_send include/linux/icmpv6.h:28 [inline]
icmpv6_send include/linux/icmpv6.h:49 [inline]
ip6_link_failure+0x31/0x5a0 net/ipv6/route.c:2787
dst_link_failure include/net/dst.h:430 [inline]
ip_tunnel_xmit+0x2d87/0x33d0 net/ipv4/ip_tunnel.c:837
erspan_xmit+0x523/0x1bf0 net/ipv4/ip_gre.c:720
__netdev_start_xmit include/linux/netdevice.h:4989 [inline]
netdev_start_xmit include/linux/netdevice.h:5003 [inline]
xmit_one net/core/dev.c:3547 [inline]
dev_hard_start_xmit+0x13a/0x6d0 net/core/dev.c:3563
sch_direct_xmit+0x1ac/0xc20 net/sched/sch_generic.c:342
qdisc_restart net/sched/sch_generic.c:407 [inline]
__qdisc_run+0x54d/0x1a20 net/sched/sch_generic.c:415
__dev_xmit_skb net/core/dev.c:3839 [inline]
__dev_queue_xmit+0x2504/0x3ee0 net/core/dev.c:4317
dev_queue_xmit include/linux/netdevice.h:3171 [inline]
br_dev_queue_push_xmit+0x272/0x7c0 net/bridge/br_forward.c:53
NF_HOOK include/linux/netfilter.h:314 [inline]
NF_HOOK include/linux/netfilter.h:308 [inline]
br_forward_finish+0xf5/0x130 net/bridge/br_forward.c:66
NF_HOOK include/linux/netfilter.h:314 [inline]
NF_HOOK include/linux/netfilter.h:308 [inline]
__br_forward+0x1e5/0x5b0 net/bridge/br_forward.c:115
deliver_clone+0x5b/0xa0 net/bridge/br_forward.c:131
maybe_deliver+0x31a/0x3e0 net/bridge/br_forward.c:190
br_flood+0x17e/0x5c0 net/bridge/br_forward.c:236
br_dev_xmit+0x1365/0x1740 net/bridge/br_device.c:104
__netdev_start_xmit include/linux/netdevice.h:4989 [inline]
netdev_start_xmit include/linux/netdevice.h:5003 [inline]
xmit_one net/core/dev.c:3547 [inline]
dev_hard_start_xmit+0x13a/0x6d0 net/core/dev.c:3563
__dev_queue_xmit+0x7b6/0x3ee0 net/core/dev.c:4351
dev_queue_xmit include/linux/netdevice.h:3171 [inline]
neigh_resolve_output net/core/neighbour.c:1563 [inline]
neigh_resolve_output+0x587/0x900 net/core/neighbour.c:1543
__neigh_update+0xb57/0x2b90 net/core/neighbour.c:1461
ndisc_update net/ipv6/ndisc.c:782 [inline]
ndisc_recv_na+0xac6/0x1150 net/ipv6/ndisc.c:1109
ndisc_rcv+0x509/0x5f0 net/ipv6/ndisc.c:1848
icmpv6_rcv+0x13f8/0x19b0 net/ipv6/icmp.c:979
ip6_protocol_deliver_rcu+0xee2/0x1430 net/ipv6/ip6_input.c:438
ip6_input_finish+0x14f/0x2f0 net/ipv6/ip6_input.c:483
NF_HOOK include/linux/netfilter.h:314 [inline]
NF_HOOK include/linux/netfilter.h:308 [inline]
ip6_input+0xa1/0xd0 net/ipv6/ip6_input.c:492
dst_input include/net/dst.h:461 [inline]
ip6_rcv_finish+0x1ad/0x5b0 net/ipv6/ip6_input.c:79
ip_sabotage_in+0x21e/0x2a0 net/bridge/br_netfilter_hooks.c:901
nf_hook_entry_hookfn include/linux/netfilter.h:154 [inline]
nf_hook_slow+0xbb/0x200 net/netfilter/core.c:626
nf_hook.constprop.0+0x42f/0x750 include/linux/netfilter.h:269
NF_HOOK include/linux/netfilter.h:312 [inline]
ipv6_rcv+0xa4/0x680 net/ipv6/ip6_input.c:310
__netif_receive_skb_one_core+0x12e/0x1e0 net/core/dev.c:5534
__netif_receive_skb+0x1f/0x1c0 net/core/dev.c:5648
netif_receive_skb_internal net/core/dev.c:5734 [inline]
netif_receive_skb+0x133/0x710 net/core/dev.c:5793
NF_HOOK include/linux/netfilter.h:314 [inline]
NF_HOOK include/linux/netfilter.h:308 [inline]
br_pass_frame_up+0x2fe/0x420 net/bridge/br_input.c:68
br_handle_frame_finish+0xdb2/0x1c40 net/bridge/br_input.c:216
br_nf_hook_thresh+0x303/0x410 net/bridge/br_netfilter_hooks.c:1070
br_nf_pre_routing_finish_ipv6+0x76a/0xfb0 net/bridge/br_netfilter_ipv6.c:154
NF_HOOK include/linux/netfilter.h:314 [inline]
br_nf_pre_routing_ipv6+0x3ce/0x8c0 net/bridge/br_netfilter_ipv6.c:184
br_nf_pre_routing+0x85e/0x15a0 net/bridge/br_netfilter_hooks.c:523
nf_hook_entry_hookfn include/linux/netfilter.h:154 [inline]
nf_hook_bridge_pre net/bridge/br_input.c:272 [inline]
br_handle_frame+0x9e9/0x1450 net/bridge/br_input.c:417
__netif_receive_skb_core.constprop.0+0x9fd/0x3f80 net/core/dev.c:5428
__netif_receive_skb_one_core+0xb1/0x1e0 net/core/dev.c:5532
__netif_receive_skb+0x1f/0x1c0 net/core/dev.c:5648
process_backlog+0x101/0x6b0 net/core/dev.c:5976
__napi_poll.constprop.0+0xb7/0x550 net/core/dev.c:6576
napi_poll net/core/dev.c:6645 [inline]
net_rx_action+0x95a/0xe90 net/core/dev.c:6778
__do_softirq+0x21c/0x8e7 kernel/softirq.c:553
do_softirq kernel/softirq.c:454 [inline]
do_softirq+0xb2/0xf0 kernel/softirq.c:441
__local_bh_enable_ip+0x100/0x120 kernel/softirq.c:381
local_bh_enable include/linux/bottom_half.h:33 [inline]
__neigh_event_send+0x31c/0x1320 net/core/neighbour.c:1245
neigh_event_send_probe include/net/neighbour.h:466 [inline]
neigh_event_send include/net/neighbour.h:472 [inline]
neigh_event_send include/net/neighbour.h:470 [inline]
neigh_resolve_output+0x5b8/0x900 net/core/neighbour.c:1547
neigh_output include/net/neighbour.h:542 [inline]
ip6_finish_output2+0x673/0x1830 net/ipv6/ip6_output.c:137
__ip6_finish_output net/ipv6/ip6_output.c:211 [inline]
ip6_finish_output+0x3f9/0x1300 net/ipv6/ip6_output.c:222
NF_HOOK_COND include/linux/netfilter.h:303 [inline]
ip6_output+0x1e2/0x530 net/ipv6/ip6_output.c:243
dst_output include/net/dst.h:451 [inline]
NF_HOOK include/linux/netfilter.h:314 [inline]
NF_HOOK include/linux/netfilter.h:308 [inline]
ip6_xmit+0x125f/0x2030 net/ipv6/ip6_output.c:358
inet6_csk_xmit+0x3ce/0x740 net/ipv6/inet6_connection_sock.c:135
__tcp_transmit_skb+0x1ada/0x3db0 net/ipv4/tcp_output.c:1462
tcp_transmit_skb net/ipv4/tcp_output.c:1480 [inline]
tcp_connect+0x3505/0x5230 net/ipv4/tcp_output.c:4100
tcp_v6_connect+0x1570/0x20f0 net/ipv6/tcp_ipv6.c:332
__inet_stream_connect+0x3d0/0x1040 net/ipv4/af_inet.c:678
inet_stream_connect+0x57/0xa0 net/ipv4/af_inet.c:749
__sys_connect_file+0x15f/0x1a0 net/socket.c:2048
__sys_connect+0x149/0x170 net/socket.c:2065
__do_sys_connect net/socket.c:2075 [inline]
__se_sys_connect net/socket.c:2072 [inline]
__x64_sys_connect+0x72/0xb0 net/socket.c:2072
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xd5/0x270 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x6f/0x77
RIP: 0033:0x7f7c96e7dda9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 90 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 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f7c97b510c8 EFLAGS: 00000246 ORIG_RAX: 000000000000002a
RAX: ffffffffffffffda RBX: 00007f7c96fac050 RCX: 00007f7c96e7dda9
RDX: 000000000000001c RSI: 0000000020000180 RDI: 0000000000000006
RBP: 00007f7c96eca47a R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000006e R14: 00007f7c96fac050 R15: 00007ffd308c6868