============================================ WARNING: possible recursive locking detected 5.18.0-rc5-syzkaller-01288-geb60020411fc #0 Not tainted -------------------------------------------- syz-executor.3/7951 is trying to acquire lock: ffff88801dc7b458 (_xmit_ETHER#2){+.-.}-{2:2}, at: spin_lock include/linux/spinlock.h:349 [inline] ffff88801dc7b458 (_xmit_ETHER#2){+.-.}-{2:2}, at: __netif_tx_lock include/linux/netdevice.h:4232 [inline] ffff88801dc7b458 (_xmit_ETHER#2){+.-.}-{2:2}, at: sch_direct_xmit+0x318/0xbe0 net/sched/sch_generic.c:340 but task is already holding lock: ffff8880779ec4d8 (_xmit_ETHER#2){+.-.}-{2:2}, at: spin_lock include/linux/spinlock.h:349 [inline] ffff8880779ec4d8 (_xmit_ETHER#2){+.-.}-{2:2}, at: __netif_tx_lock include/linux/netdevice.h:4232 [inline] ffff8880779ec4d8 (_xmit_ETHER#2){+.-.}-{2:2}, at: sch_direct_xmit+0x318/0xbe0 net/sched/sch_generic.c:340 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 7 locks held by syz-executor.3/7951: #0: ffffffff8bd82000 (rcu_read_lock_bh){....}-{1:2}, at: lwtunnel_xmit_redirect include/net/lwtunnel.h:95 [inline] #0: ffffffff8bd82000 (rcu_read_lock_bh){....}-{1:2}, at: ip_finish_output2+0x292/0x2170 net/ipv4/ip_output.c:214 #1: ffffffff8bd82000 (rcu_read_lock_bh){....}-{1:2}, at: __dev_queue_xmit+0x1e3/0x3a60 net/core/dev.c:4169 #2: ffff88807d2ac258 (dev->qdisc_tx_busylock ?: &qdisc_tx_busylock){+...}-{2:2}, at: spin_trylock include/linux/spinlock.h:359 [inline] #2: ffff88807d2ac258 (dev->qdisc_tx_busylock ?: &qdisc_tx_busylock){+...}-{2:2}, at: qdisc_run_begin include/net/sch_generic.h:187 [inline] #2: ffff88807d2ac258 (dev->qdisc_tx_busylock ?: &qdisc_tx_busylock){+...}-{2:2}, at: qdisc_run_begin include/net/sch_generic.h:184 [inline] #2: ffff88807d2ac258 (dev->qdisc_tx_busylock ?: &qdisc_tx_busylock){+...}-{2:2}, at: __dev_xmit_skb net/core/dev.c:3796 [inline] #2: ffff88807d2ac258 (dev->qdisc_tx_busylock ?: &qdisc_tx_busylock){+...}-{2:2}, at: __dev_queue_xmit+0x12ca/0x3a60 net/core/dev.c:4218 #3: ffff8880779ec4d8 (_xmit_ETHER#2){+.-.}-{2:2}, at: spin_lock include/linux/spinlock.h:349 [inline] #3: ffff8880779ec4d8 (_xmit_ETHER#2){+.-.}-{2:2}, at: __netif_tx_lock include/linux/netdevice.h:4232 [inline] #3: ffff8880779ec4d8 (_xmit_ETHER#2){+.-.}-{2:2}, at: sch_direct_xmit+0x318/0xbe0 net/sched/sch_generic.c:340 #4: ffffffff8bd82000 (rcu_read_lock_bh){....}-{1:2}, at: lwtunnel_xmit_redirect include/net/lwtunnel.h:95 [inline] #4: ffffffff8bd82000 (rcu_read_lock_bh){....}-{1:2}, at: ip_finish_output2+0x292/0x2170 net/ipv4/ip_output.c:214 #5: ffffffff8bd82000 (rcu_read_lock_bh){....}-{1:2}, at: __dev_queue_xmit+0x1e3/0x3a60 net/core/dev.c:4169 #6: ffff888016928258 (dev->qdisc_tx_busylock ?: &qdisc_tx_busylock){+...}-{2:2}, at: spin_trylock include/linux/spinlock.h:359 [inline] #6: ffff888016928258 (dev->qdisc_tx_busylock ?: &qdisc_tx_busylock){+...}-{2:2}, at: qdisc_run_begin include/net/sch_generic.h:187 [inline] #6: ffff888016928258 (dev->qdisc_tx_busylock ?: &qdisc_tx_busylock){+...}-{2:2}, at: qdisc_run_begin include/net/sch_generic.h:184 [inline] #6: ffff888016928258 (dev->qdisc_tx_busylock ?: &qdisc_tx_busylock){+...}-{2:2}, at: __dev_xmit_skb net/core/dev.c:3796 [inline] #6: ffff888016928258 (dev->qdisc_tx_busylock ?: &qdisc_tx_busylock){+...}-{2:2}, at: __dev_queue_xmit+0x12ca/0x3a60 net/core/dev.c:4218 stack backtrace: CPU: 0 PID: 7951 Comm: syz-executor.3 Not tainted 5.18.0-rc5-syzkaller-01288-geb60020411fc #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __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] __netif_tx_lock include/linux/netdevice.h:4232 [inline] sch_direct_xmit+0x318/0xbe0 net/sched/sch_generic.c:340 __dev_xmit_skb net/core/dev.c:3809 [inline] __dev_queue_xmit+0x14f7/0x3a60 net/core/dev.c:4218 dev_queue_xmit include/linux/netdevice.h:2971 [inline] neigh_resolve_output net/core/neighbour.c:1528 [inline] neigh_resolve_output+0x50f/0x830 net/core/neighbour.c:1508 neigh_output include/net/neighbour.h:549 [inline] ip_finish_output2+0x782/0x2170 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_mc_output+0x21b/0x700 net/ipv4/ip_output.c:415 dst_output include/net/dst.h:451 [inline] ip_local_out+0xaf/0x1a0 net/ipv4/ip_output.c:126 iptunnel_xmit+0x67a/0xa40 net/ipv4/ip_tunnel_core.c:82 ip_tunnel_xmit+0x10f0/0x2c00 net/ipv4/ip_tunnel.c:811 erspan_xmit+0x7ec/0x29a0 net/ipv4/ip_gre.c:711 __netdev_start_xmit include/linux/netdevice.h:4769 [inline] netdev_start_xmit include/linux/netdevice.h:4783 [inline] xmit_one net/core/dev.c:3582 [inline] dev_hard_start_xmit+0x1eb/0x920 net/core/dev.c:3598 sch_direct_xmit+0x19f/0xbe0 net/sched/sch_generic.c:342 __dev_xmit_skb net/core/dev.c:3809 [inline] __dev_queue_xmit+0x14f7/0x3a60 net/core/dev.c:4218 dev_queue_xmit include/linux/netdevice.h:2971 [inline] neigh_resolve_output net/core/neighbour.c:1528 [inline] neigh_resolve_output+0x50f/0x830 net/core/neighbour.c:1508 neigh_output include/net/neighbour.h:549 [inline] ip_finish_output2+0x782/0x2170 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_mc_output+0x21b/0x700 net/ipv4/ip_output.c:415 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+0x6c8/0x11a0 net/ipv4/udp.c:967 udp_sendmsg+0x1bee/0x2760 net/ipv4/udp.c:1254 inet_sendmsg+0x99/0xe0 net/ipv4/af_inet.c:819 sock_sendmsg_nosec net/socket.c:705 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:725 ____sys_sendmsg+0x334/0x810 net/socket.c:2422 ___sys_sendmsg+0xf3/0x170 net/socket.c:2476 __sys_sendmmsg+0x195/0x470 net/socket.c:2562 __do_sys_sendmmsg net/socket.c:2591 [inline] __se_sys_sendmmsg net/socket.c:2588 [inline] __x64_sys_sendmmsg+0x99/0x100 net/socket.c:2588 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: 0033:0x7fd1ef4890e9 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fd1f0698168 EFLAGS: 00000246 ORIG_RAX: 0000000000000133 RAX: ffffffffffffffda RBX: 00007fd1ef59bf60 RCX: 00007fd1ef4890e9 RDX: 0000000000000001 RSI: 0000000020001840 RDI: 0000000000000003 RBP: 00007fd1ef4e308d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffd9c76c06f R14: 00007fd1f0698300 R15: 0000000000022000