===================================== WARNING: bad unlock balance detected! 5.5.0-rc4-syzkaller #0 Not tainted ------------------------------------- ksoftirqd/1/16 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 ksoftirqd/1/16: #0: ffffc90000d7fc00 ((&ndev->rs_timer)){+.-.}, at: lockdep_copy_map include/linux/lockdep.h:172 [inline] #0: ffffc90000d7fc00 ((&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 #4: ffff88809868b250 (&dev->qdisc_tx_busylock_key#13){+...}, at: spin_trylock include/linux/spinlock.h:348 [inline] #4: ffff88809868b250 (&dev->qdisc_tx_busylock_key#13){+...}, at: qdisc_run_begin include/net/sch_generic.h:159 [inline] #4: ffff88809868b250 (&dev->qdisc_tx_busylock_key#13){+...}, at: __dev_xmit_skb net/core/dev.c:3611 [inline] #4: ffff88809868b250 (&dev->qdisc_tx_busylock_key#13){+...}, at: __dev_queue_xmit+0x2412/0x35c0 net/core/dev.c:3982 #5: ffff88809868b138 (&dev->qdisc_running_key#13){+...}, at: dev_queue_xmit+0x18/0x20 net/core/dev.c:4046 stack backtrace: CPU: 1 PID: 16 Comm: ksoftirqd/1 Not tainted 5.5.0-rc4-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_resolve_output net/core/neighbour.c:1487 [inline] neigh_resolve_output+0x5c4/0x990 net/core/neighbour.c:1467 neigh_output include/net/neighbour.h:510 [inline] ip6_finish_output2+0x109a/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 run_ksoftirqd kernel/softirq.c:603 [inline] run_ksoftirqd+0x8e/0x110 kernel/softirq.c:595 smpboot_thread_fn+0x6a3/0xa40 kernel/smpboot.c:165 kthread+0x361/0x430 kernel/kthread.c:255 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 kobject: 'brport' (000000007eaf2e7f): kobject_cleanup, parent 00000000304ea4a3 kobject: 'brport' (000000007eaf2e7f): calling ktype release kobject: 'brport': free name kobject: 'brport' (00000000085f6638): kobject_cleanup, parent 00000000304ea4a3 kobject: 'brport' (00000000085f6638): calling ktype release kobject: 'brport': free name kobject: 'brport' (00000000eb3727bd): kobject_cleanup, parent 00000000304ea4a3 kobject: 'brport' (00000000eb3727bd): calling ktype release kobject: 'brport': free name kobject: 'brport' (00000000e5914131): kobject_cleanup, parent 00000000304ea4a3 kobject: 'brport' (00000000e5914131): calling ktype release kobject: 'brport': free name kobject: 'brport' (00000000cf4d9047): kobject_cleanup, parent 00000000304ea4a3 kobject: 'brport' (00000000cf4d9047): calling ktype release kobject: 'brport': free name kobject: 'brport' (00000000087203d0): kobject_cleanup, parent 00000000304ea4a3 kobject: 'brport' (00000000087203d0): calling ktype release kobject: 'brport': free name kobject: 'brport' (00000000a62946e8): kobject_cleanup, parent 00000000304ea4a3 kobject: 'brport' (00000000a62946e8): calling ktype release kobject: 'brport': free name