===================================== WARNING: bad unlock balance detected! 5.5.0-rc5-syzkaller #0 Not tainted ------------------------------------- swapper/1/0 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] [] sch_direct_xmit+0x3fa/0xd30 net/sched/sch_generic.c:315 but there are no more locks to release! other info that might help us debug this: 6 locks held by swapper/1/0: #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: ffffffff899a5340 (rcu_read_lock){....}, at: ip6_nd_hdr net/ipv6/ndisc.c:463 [inline] #1: ffffffff899a5340 (rcu_read_lock){....}, at: ndisc_send_skb+0x7fe/0x1490 net/ipv6/ndisc.c:499 #2: ffffffff899a5300 (rcu_read_lock_bh){....}, at: lwtunnel_xmit_redirect include/net/lwtunnel.h:92 [inline] #2: ffffffff899a5300 (rcu_read_lock_bh){....}, at: ip6_finish_output2+0x214/0x25c0 net/ipv6/ip6_output.c:102 #3: ffffffff899a5300 (rcu_read_lock_bh){....}, at: __dev_queue_xmit+0x20a/0x35c0 net/core/dev.c:3948 #4: ffff888096b4f250 (&dev->qdisc_tx_busylock_key#3){+...}, at: spin_trylock include/linux/spinlock.h:348 [inline] #4: ffff888096b4f250 (&dev->qdisc_tx_busylock_key#3){+...}, at: qdisc_run_begin include/net/sch_generic.h:159 [inline] #4: ffff888096b4f250 (&dev->qdisc_tx_busylock_key#3){+...}, at: __dev_xmit_skb net/core/dev.c:3611 [inline] #4: ffff888096b4f250 (&dev->qdisc_tx_busylock_key#3){+...}, at: __dev_queue_xmit+0x2412/0x35c0 net/core/dev.c:3982 #5: ffff888096b4f138 (&dev->qdisc_running_key#3){+...}, at: dev_queue_xmit+0x18/0x20 net/core/dev.c:4046 stack backtrace: CPU: 1 PID: 0 Comm: swapper/1 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] sch_direct_xmit+0x3fa/0xd30 net/sched/sch_generic.c:315 __dev_xmit_skb net/core/dev.c:3621 [inline] __dev_queue_xmit+0x2707/0x35c0 net/core/dev.c:3982 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: 0010:native_safe_halt+0xe/0x10 arch/x86/include/asm/irqflags.h:61 Code: 38 be db f9 eb 8a cc cc cc cc cc cc e9 07 00 00 00 0f 00 2d c4 54 51 00 f4 c3 66 90 e9 07 00 00 00 0f 00 2d b4 54 51 00 fb f4 cc 55 48 89 e5 41 57 41 56 41 55 41 54 53 e8 5e 92 8b f9 e8 c9 RSP: 0018:ffffc90000d3fd68 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13 RAX: 1ffffffff132669e RBX: ffff8880a99fc340 RCX: 0000000000000000 RDX: dffffc0000000000 RSI: 0000000000000006 RDI: ffff8880a99fcbd4 RBP: ffffc90000d3fd98 R08: ffff8880a99fc340 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: dffffc0000000000 R13: ffffffff8a7b8600 R14: 0000000000000000 R15: 0000000000000001 arch_cpu_idle+0xa/0x10 arch/x86/kernel/process.c:690 default_idle_call+0x84/0xb0 kernel/sched/idle.c:94 cpuidle_idle_call kernel/sched/idle.c:154 [inline] do_idle+0x3c8/0x6e0 kernel/sched/idle.c:269 cpu_startup_entry+0x1b/0x20 kernel/sched/idle.c:361 start_secondary+0x2f4/0x410 arch/x86/kernel/smpboot.c:264 secondary_startup_64+0xa4/0xb0 arch/x86/kernel/head_64.S:242 kobject: 'brport' (0000000065af3c19): kobject_cleanup, parent 000000008addcedb kobject: 'brport' (0000000065af3c19): calling ktype release kobject: 'brport': free name kobject: 'brport' (00000000e743182e): kobject_cleanup, parent 000000008addcedb kobject: 'brport' (00000000e743182e): calling ktype release kobject: 'brport': free name kobject: 'brport' (000000005e7bc871): kobject_cleanup, parent 000000008addcedb kobject: 'brport' (000000005e7bc871): calling ktype release kobject: 'brport': free name kobject: 'brport' (000000001f52ec9e): kobject_cleanup, parent 000000008addcedb kobject: 'brport' (000000001f52ec9e): calling ktype release kobject: 'brport': free name kobject: 'brport' (00000000602580ed): kobject_cleanup, parent 000000008addcedb kobject: 'brport' (00000000602580ed): calling ktype release kobject: 'brport': free name kobject: 'brport' (0000000021789905): kobject_cleanup, parent 000000008addcedb kobject: 'brport' (0000000021789905): calling ktype release kobject: 'brport': free name kobject: 'brport' (000000001d123441): kobject_cleanup, parent 000000008addcedb kobject: 'brport' (000000001d123441): calling ktype release kobject: 'brport': free name kobject: 'brport' (00000000316e9d8e): kobject_cleanup, parent 000000008addcedb kobject: 'brport' (00000000316e9d8e): calling ktype release kobject: 'brport': free name