===================================== WARNING: bad unlock balance detected! 5.5.0-rc5-syzkaller #0 Not tainted ------------------------------------- syz-executor.5/9543 is trying to release lock (&dev->qdisc_xmit_lock_key) at: [] spin_unlock include/linux/spinlock.h:378 [inline] [] __netif_tx_unlock include/linux/netdevice.h:3966 [inline] [] __dev_queue_xmit+0x2bbd/0x35c0 net/core/dev.c:4016 but there are no more locks to release! other info that might help us debug this: 4 locks held by syz-executor.5/9543: #0: ffffc90000da8d50 ((&ndev->rs_timer)){+.-.}, at: lockdep_copy_map include/linux/lockdep.h:172 [inline] #0: ffffc90000da8d50 ((&ndev->rs_timer)){+.-.}, at: call_timer_fn+0xe0/0x780 kernel/time/timer.c:1394 #1: ffffffff899a5600 (rcu_read_lock){....}, at: ip6_nd_hdr net/ipv6/ndisc.c:463 [inline] #1: ffffffff899a5600 (rcu_read_lock){....}, at: ndisc_send_skb+0x7fe/0x1490 net/ipv6/ndisc.c:499 #2: ffffffff899a55c0 (rcu_read_lock_bh){....}, at: lwtunnel_xmit_redirect include/net/lwtunnel.h:92 [inline] #2: ffffffff899a55c0 (rcu_read_lock_bh){....}, at: ip6_finish_output2+0x214/0x25c0 net/ipv6/ip6_output.c:102 #3: ffffffff899a55c0 (rcu_read_lock_bh){....}, at: __dev_queue_xmit+0x20a/0x35c0 net/core/dev.c:3948 stack backtrace: CPU: 1 PID: 9543 Comm: syz-executor.5 Not tainted 5.5.0-rc5-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x197/0x210 lib/dump_stack.c:118 print_unlock_imbalance_bug kernel/locking/lockdep.c:4008 [inline] print_unlock_imbalance_bug.cold+0x114/0x123 kernel/locking/lockdep.c:3984 __lock_release kernel/locking/lockdep.c:4242 [inline] lock_release+0x5f2/0x960 kernel/locking/lockdep.c:4503 __raw_spin_unlock include/linux/spinlock_api_smp.h:150 [inline] _raw_spin_unlock+0x16/0x40 kernel/locking/spinlock.c:183 spin_unlock include/linux/spinlock.h:378 [inline] __netif_tx_unlock include/linux/netdevice.h:3966 [inline] __dev_queue_xmit+0x2bbd/0x35c0 net/core/dev.c:4016 dev_queue_xmit+0x18/0x20 net/core/dev.c:4046 neigh_hh_output include/net/neighbour.h:499 [inline] neigh_output include/net/neighbour.h:508 [inline] ip6_finish_output2+0xfbe/0x25c0 net/ipv6/ip6_output.c:116 __ip6_finish_output+0x444/0xaa0 net/ipv6/ip6_output.c:142 ip6_finish_output+0x38/0x1f0 net/ipv6/ip6_output.c:152 NF_HOOK_COND include/linux/netfilter.h:296 [inline] ip6_output+0x25e/0x880 net/ipv6/ip6_output.c:175 dst_output include/net/dst.h:436 [inline] NF_HOOK include/linux/netfilter.h:307 [inline] ndisc_send_skb+0xf1f/0x1490 net/ipv6/ndisc.c:505 ndisc_send_rs+0x134/0x720 net/ipv6/ndisc.c:699 addrconf_rs_timer+0x30f/0x6e0 net/ipv6/addrconf.c:3879 call_timer_fn+0x1ac/0x780 kernel/time/timer.c:1404 expire_timers kernel/time/timer.c:1449 [inline] __run_timers kernel/time/timer.c:1773 [inline] __run_timers kernel/time/timer.c:1740 [inline] run_timer_softirq+0x6c3/0x1790 kernel/time/timer.c:1786 __do_softirq+0x262/0x98c kernel/softirq.c:292 invoke_softirq kernel/softirq.c:373 [inline] irq_exit+0x19b/0x1e0 kernel/softirq.c:413 exiting_irq arch/x86/include/asm/apic.h:536 [inline] smp_apic_timer_interrupt+0x1a3/0x610 arch/x86/kernel/apic/apic.c:1137 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:829 RIP: 0033:0x45dd8a Code: 25 18 00 00 00 00 74 01 f0 48 0f b1 3d bf ab 61 00 48 39 c2 75 da f3 c3 0f 1f 84 00 00 00 00 00 48 63 ff b8 e4 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 06 f3 c3 0f 1f 40 00 48 c7 c2 d4 ff ff ff f7 RSP: 002b:0000000000a6fd78 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 RAX: 0000000000000000 RBX: 000000000002e18c RCX: 000000000045dd8a RDX: 0000000000000000 RSI: 0000000000a6fd80 RDI: 0000000000000001 RBP: 0000000000000046 R08: 0000000000000001 R09: 000000000245f940 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000014 R13: 0000000000a6fde0 R14: 000000000002e11b R15: 0000000000a6fdf0 kobject: 'brport' (00000000259a517b): kobject_cleanup, parent 000000000202ce2f kobject: 'brport' (00000000259a517b): calling ktype release kobject: 'brport': free name kobject: 'brport' (00000000743e2f38): kobject_cleanup, parent 000000000202ce2f kobject: 'brport' (00000000743e2f38): calling ktype release kobject: 'brport': free name kobject: 'brport' (00000000c049dabc): kobject_cleanup, parent 000000000202ce2f kobject: 'brport' (00000000c049dabc): calling ktype release kobject: 'brport': free name kobject: 'brport' (000000001d66cf63): kobject_cleanup, parent 000000000202ce2f kobject: 'brport' (000000001d66cf63): calling ktype release kobject: 'brport': free name kobject: 'brport' (000000006bb8aaa9): kobject_cleanup, parent 000000000202ce2f kobject: 'brport' (000000006bb8aaa9): calling ktype release kobject: 'brport': free name kobject: 'brport' (000000005501e5fb): kobject_cleanup, parent 000000000202ce2f kobject: 'brport' (000000005501e5fb): calling ktype release kobject: 'brport': free name kobject: 'brport' (00000000c68d6b19): kobject_cleanup, parent 000000000202ce2f kobject: 'brport' (00000000c68d6b19): calling ktype release kobject: 'brport': free name kobject: 'brport' (00000000bf44a12b): kobject_cleanup, parent 000000000202ce2f kobject: 'brport' (00000000bf44a12b): calling ktype release kobject: 'brport': free name kobject: 'brport' (0000000099b7ea15): kobject_cleanup, parent 000000000202ce2f kobject: 'brport' (0000000099b7ea15): calling ktype release kobject: 'brport': free name