============================================
WARNING: possible recursive locking detected
5.18.0-rc2-syzkaller-00975-g0339d25a2807 #0 Not tainted
--------------------------------------------
syz-executor350/3616 is trying to acquire lock:
ffff88807eafe218 (dev->qdisc_tx_busylock ?: &qdisc_tx_busylock){+...}-{2:2}, at: spin_lock include/linux/spinlock.h:349 [inline]
ffff88807eafe218 (dev->qdisc_tx_busylock ?: &qdisc_tx_busylock){+...}-{2:2}, at: __dev_xmit_skb net/core/dev.c:3794 [inline]
ffff88807eafe218 (dev->qdisc_tx_busylock ?: &qdisc_tx_busylock){+...}-{2:2}, at: __dev_queue_xmit+0x2f59/0x39c0 net/core/dev.c:4146
but task is already holding lock:
ffff888075354258 (dev->qdisc_tx_busylock ?: &qdisc_tx_busylock){+...}-{2:2}, at: spin_trylock include/linux/spinlock.h:359 [inline]
ffff888075354258 (dev->qdisc_tx_busylock ?: &qdisc_tx_busylock){+...}-{2:2}, at: qdisc_run_begin include/net/sch_generic.h:187 [inline]
ffff888075354258 (dev->qdisc_tx_busylock ?: &qdisc_tx_busylock){+...}-{2:2}, at: qdisc_run_begin include/net/sch_generic.h:184 [inline]
ffff888075354258 (dev->qdisc_tx_busylock ?: &qdisc_tx_busylock){+...}-{2:2}, at: __dev_xmit_skb net/core/dev.c:3751 [inline]
ffff888075354258 (dev->qdisc_tx_busylock ?: &qdisc_tx_busylock){+...}-{2:2}, at: __dev_queue_xmit+0x130e/0x39c0 net/core/dev.c:4146
other info that might help us debug this:
Possible unsafe locking scenario:
CPU0
----
lock(dev->qdisc_tx_busylock ?: &qdisc_tx_busylock);
lock(dev->qdisc_tx_busylock ?: &qdisc_tx_busylock);
*** DEADLOCK ***
May be due to missing lock nesting notation
5 locks held by syz-executor350/3616:
#0: ffffffff8bd81d80 (rcu_read_lock_bh){....}-{1:2}, at: lwtunnel_xmit_redirect include/net/lwtunnel.h:95 [inline]
#0: ffffffff8bd81d80 (rcu_read_lock_bh){....}-{1:2}, at: ip_finish_output2+0x292/0x2170 net/ipv4/ip_output.c:214
#1: ffffffff8bd81d80 (rcu_read_lock_bh){....}-{1:2}, at: __dev_queue_xmit+0x1e3/0x39c0 net/core/dev.c:4105
#2: ffff888075354258 (dev->qdisc_tx_busylock ?: &qdisc_tx_busylock){+...}-{2:2}, at: spin_trylock include/linux/spinlock.h:359 [inline]
#2: ffff888075354258 (dev->qdisc_tx_busylock ?: &qdisc_tx_busylock){+...}-{2:2}, at: qdisc_run_begin include/net/sch_generic.h:187 [inline]
#2: ffff888075354258 (dev->qdisc_tx_busylock ?: &qdisc_tx_busylock){+...}-{2:2}, at: qdisc_run_begin include/net/sch_generic.h:184 [inline]
#2: ffff888075354258 (dev->qdisc_tx_busylock ?: &qdisc_tx_busylock){+...}-{2:2}, at: __dev_xmit_skb net/core/dev.c:3751 [inline]
#2: ffff888075354258 (dev->qdisc_tx_busylock ?: &qdisc_tx_busylock){+...}-{2:2}, at: __dev_queue_xmit+0x130e/0x39c0 net/core/dev.c:4146
#3: ffffffff8bd81d80 (rcu_read_lock_bh){....}-{1:2}, at: lwtunnel_xmit_redirect include/net/lwtunnel.h:95 [inline]
#3: ffffffff8bd81d80 (rcu_read_lock_bh){....}-{1:2}, at: ip_finish_output2+0x292/0x2170 net/ipv4/ip_output.c:214
#4: ffffffff8bd81d80 (rcu_read_lock_bh){....}-{1:2}, at: __dev_queue_xmit+0x1e3/0x39c0 net/core/dev.c:4105
stack backtrace:
CPU: 0 PID: 3616 Comm: syz-executor350 Not tainted 5.18.0-rc2-syzkaller-00975-g0339d25a2807 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106
print_deadlock_bug kernel/locking/lockdep.c:2958 [inline]
check_deadlock kernel/locking/lockdep.c:3001 [inline]
validate_chain kernel/locking/lockdep.c:3790 [inline]
__lock_acquire.cold+0x12c/0x3a7 kernel/locking/lockdep.c:5029
lock_acquire kernel/locking/lockdep.c:5641 [inline]
lock_acquire+0x1ab/0x510 kernel/locking/lockdep.c:5606
__raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline]
_raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:154
spin_lock include/linux/spinlock.h:349 [inline]
__dev_xmit_skb net/core/dev.c:3794 [inline]
__dev_queue_xmit+0x2f59/0x39c0 net/core/dev.c:4146
neigh_hh_output include/net/neighbour.h:533 [inline]
neigh_output include/net/neighbour.h:547 [inline]
ip_finish_output2+0x14df/0x2170 net/ipv4/ip_output.c:228
__ip_finish_output net/ipv4/ip_output.c:306 [inline]
__ip_finish_output+0x396/0x650 net/ipv4/ip_output.c:288
ip_finish_output+0x32/0x280 net/ipv4/ip_output.c:316
NF_HOOK_COND include/linux/netfilter.h:296 [inline]
ip_output+0x196/0x310 net/ipv4/ip_output.c:430
dst_output include/net/dst.h:451 [inline]
ip_local_out+0xaf/0x1a0 net/ipv4/ip_output.c:126
iptunnel_xmit+0x68c/0xa50 net/ipv4/ip_tunnel_core.c:82
ip_tunnel_xmit+0x10a8/0x2b70 net/ipv4/ip_tunnel.c:810
gre_tap_xmit+0x504/0x630 net/ipv4/ip_gre.c:741
__netdev_start_xmit include/linux/netdevice.h:4731 [inline]
netdev_start_xmit include/linux/netdevice.h:4745 [inline]
xmit_one net/core/dev.c:3537 [inline]
dev_hard_start_xmit+0x1eb/0x920 net/core/dev.c:3553
sch_direct_xmit+0x19f/0xbe0 net/sched/sch_generic.c:342
__dev_xmit_skb net/core/dev.c:3764 [inline]
__dev_queue_xmit+0x153b/0x39c0 net/core/dev.c:4146
neigh_hh_output include/net/neighbour.h:533 [inline]
neigh_output include/net/neighbour.h:547 [inline]
ip_finish_output2+0x14df/0x2170 net/ipv4/ip_output.c:228
__ip_finish_output net/ipv4/ip_output.c:306 [inline]
__ip_finish_output+0x396/0x650 net/ipv4/ip_output.c:288
ip_finish_output+0x32/0x280 net/ipv4/ip_output.c:316
NF_HOOK_COND include/linux/netfilter.h:296 [inline]
ip_output+0x196/0x310 net/ipv4/ip_output.c:430
dst_output include/net/dst.h:451 [inline]
ip_local_out net/ipv4/ip_output.c:126 [inline]
ip_send_skb+0xd4/0x260 net/ipv4/ip_output.c:1571
udp_send_skb+0x6d2/0x11b0 net/ipv4/udp.c:967
udp_sendmsg+0x1bae/0x2730 net/ipv4/udp.c:1254
udpv6_sendmsg+0x1747/0x2c30 net/ipv6/udp.c:1364
inet6_sendmsg+0x99/0xe0 net/ipv6/af_inet6.c:652
sock_sendmsg_nosec net/socket.c:705 [inline]
sock_sendmsg+0xcf/0x120 net/socket.c:725
____sys_sendmsg+0x32b/0x800 net/socket.c:2413
___sys_sendmsg+0xf3/0x170 net/socket.c:2467
__sys_sendmmsg+0x195/0x470 net/socket.c:2553
__do_sys_sendmmsg net/socket.c:2582 [inline]
__se_sys_sendmmsg net/socket.c:2579 [inline]
__x64_sys_sendmmsg+0x99/0x100 net/socket.c:2579
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7fa2b7a38da9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 41 15 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 c0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffe1bd7dfe8 EFLAGS: 00000246 ORIG_RAX: 0000000000000133
RAX: ffffffffffffffda RBX: 00007ffe1bd7e010 RCX: 00007fa2b7a38da9
RDX: 0000000000026700 RSI: 00000000200092c0 RDI: 0000000000000005
RBP: 0000000000000000 R08: 000000000000000d R09: 000000000000000d
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffe1bd7e000
R13: 00000000000f4240 R14: 000000000000cc5b R15: 00007ffe1bd7dff4
</TASK>
IPv6: ADDRCONF(NETDEV_CHANGE): vcan0: link becomes ready
chnl_net:chnl_net_open(): err: Unable to register and open device, Err:-19
caif:caif_disconnect_client(): nothing to disconnect
chnl_net:chnl_flowctrl_cb(): NET flowctrl func called flow: CLOSE/DEINIT
chnl_net:chnl_net_open(): state disconnected