===================================== WARNING: bad unlock balance detected! 5.5.0-rc5-syzkaller #0 Not tainted ------------------------------------- syz-executor.2/9479 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:3969 [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: 11 locks held by syz-executor.2/9479: #0: ffffffff89a14b10 (dup_mmap_sem.rw_sem){.+.+}, at: dup_mmap kernel/fork.c:490 [inline] #0: ffffffff89a14b10 (dup_mmap_sem.rw_sem){.+.+}, at: dup_mm+0x104/0x1430 kernel/fork.c:1360 #1: ffff88809734b098 (&mm->mmap_sem#2){++++}, at: dup_mmap kernel/fork.c:491 [inline] #1: ffff88809734b098 (&mm->mmap_sem#2){++++}, at: dup_mm+0x120/0x1430 kernel/fork.c:1360 #2: ffff888046a94e98 (&mm->mmap_sem/1){+.+.}, at: dup_mmap kernel/fork.c:500 [inline] #2: ffff888046a94e98 (&mm->mmap_sem/1){+.+.}, at: dup_mm+0x165/0x1430 kernel/fork.c:1360 #3: ffff8880a7add6a0 (&(ptlock_ptr(page))->rlock#2){+.+.}, at: spin_lock include/linux/spinlock.h:338 [inline] #3: ffff8880a7add6a0 (&(ptlock_ptr(page))->rlock#2){+.+.}, at: copy_pte_range mm/memory.c:816 [inline] #3: ffff8880a7add6a0 (&(ptlock_ptr(page))->rlock#2){+.+.}, at: copy_pmd_range mm/memory.c:892 [inline] #3: ffff8880a7add6a0 (&(ptlock_ptr(page))->rlock#2){+.+.}, at: copy_pud_range mm/memory.c:926 [inline] #3: ffff8880a7add6a0 (&(ptlock_ptr(page))->rlock#2){+.+.}, at: copy_p4d_range mm/memory.c:948 [inline] #3: ffff8880a7add6a0 (&(ptlock_ptr(page))->rlock#2){+.+.}, at: copy_page_range+0xb0e/0x2190 mm/memory.c:1010 #4: ffff888095ecba10 (&(ptlock_ptr(page))->rlock#2/1){+.+.}, at: copy_pte_range mm/memory.c:821 [inline] #4: ffff888095ecba10 (&(ptlock_ptr(page))->rlock#2/1){+.+.}, at: copy_pmd_range mm/memory.c:892 [inline] #4: ffff888095ecba10 (&(ptlock_ptr(page))->rlock#2/1){+.+.}, at: copy_pud_range mm/memory.c:926 [inline] #4: ffff888095ecba10 (&(ptlock_ptr(page))->rlock#2/1){+.+.}, at: copy_p4d_range mm/memory.c:948 [inline] #4: ffff888095ecba10 (&(ptlock_ptr(page))->rlock#2/1){+.+.}, at: copy_page_range+0xb99/0x2190 mm/memory.c:1010 #5: ffffc90000007d50 ((&ndev->rs_timer)){+.-.}, at: lockdep_copy_map include/linux/lockdep.h:172 [inline] #5: ffffc90000007d50 ((&ndev->rs_timer)){+.-.}, at: call_timer_fn+0xe0/0x780 kernel/time/timer.c:1394 #6: ffffffff899a5380 (rcu_read_lock){....}, at: ip6_nd_hdr net/ipv6/ndisc.c:463 [inline] #6: ffffffff899a5380 (rcu_read_lock){....}, at: ndisc_send_skb+0x7fe/0x1490 net/ipv6/ndisc.c:499 #7: ffffffff899a5340 (rcu_read_lock_bh){....}, at: lwtunnel_xmit_redirect include/net/lwtunnel.h:92 [inline] #7: ffffffff899a5340 (rcu_read_lock_bh){....}, at: ip6_finish_output2+0x214/0x25c0 net/ipv6/ip6_output.c:102 #8: ffffffff899a5340 (rcu_read_lock_bh){....}, at: __dev_queue_xmit+0x20a/0x35c0 net/core/dev.c:3948 #9: ffff8880a2495250 (&dev->qdisc_tx_busylock_key#23){+...}, at: spin_trylock include/linux/spinlock.h:348 [inline] #9: ffff8880a2495250 (&dev->qdisc_tx_busylock_key#23){+...}, at: qdisc_run_begin include/net/sch_generic.h:159 [inline] #9: ffff8880a2495250 (&dev->qdisc_tx_busylock_key#23){+...}, at: __dev_xmit_skb net/core/dev.c:3611 [inline] #9: ffff8880a2495250 (&dev->qdisc_tx_busylock_key#23){+...}, at: __dev_queue_xmit+0x2412/0x35c0 net/core/dev.c:3982 #10: ffff8880a2495138 (&dev->qdisc_running_key#23){+...}, at: dev_queue_xmit+0x18/0x20 net/core/dev.c:4046 stack backtrace: CPU: 0 PID: 9479 Comm: syz-executor.2 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:3969 [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 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:__sanitizer_cov_trace_const_cmp1+0x11/0x20 kernel/kcov.c:260 Code: bf 06 00 00 00 48 89 e5 48 8b 4d 08 e8 18 ff ff ff 5d c3 66 0f 1f 44 00 00 55 40 0f b6 d6 40 0f b6 f7 bf 01 00 00 00 48 89 e5 <48> 8b 4d 08 e8 f6 fe ff ff 5d c3 0f 1f 40 00 55 0f b7 d6 0f b7 f7 RSP: 0018:ffffc90001e67828 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 RAX: 1ffffd400037c4a8 RBX: ffffea0001be2540 RCX: ffffffff81a37c43 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000001 RBP: ffffc90001e67828 R08: 1ffffd400037c4a8 R09: fffff9400037c4a9 R10: fffff9400037c4a8 R11: ffffea0001be2547 R12: 0000000000000000 R13: 0000000000000000 R14: dffffc0000000000 R15: 0000000000000000 mm_counter_file include/linux/mm.h:1657 [inline] mm_counter include/linux/mm.h:1666 [inline] copy_one_pte mm/memory.c:792 [inline] copy_pte_range mm/memory.c:841 [inline] copy_pmd_range mm/memory.c:892 [inline] copy_pud_range mm/memory.c:926 [inline] copy_p4d_range mm/memory.c:948 [inline] copy_page_range+0x13fa/0x2190 mm/memory.c:1010 dup_mmap kernel/fork.c:604 [inline] dup_mm+0xa67/0x1430 kernel/fork.c:1360 copy_mm kernel/fork.c:1416 [inline] copy_process+0x2ad6/0x7230 kernel/fork.c:2072 _do_fork+0x146/0x1090 kernel/fork.c:2421 __do_sys_clone kernel/fork.c:2576 [inline] __se_sys_clone kernel/fork.c:2557 [inline] __x64_sys_clone+0x19a/0x260 kernel/fork.c:2557 do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45951a Code: f7 d8 64 89 04 25 d4 02 00 00 64 4c 8b 0c 25 10 00 00 00 31 d2 4d 8d 91 d0 02 00 00 31 f6 bf 11 00 20 01 b8 38 00 00 00 0f 05 <48> 3d 00 f0 ff ff 0f 87 f5 00 00 00 85 c0 41 89 c5 0f 85 fc 00 00 RSP: 002b:00007fffda186070 EFLAGS: 00000246 ORIG_RAX: 0000000000000038 RAX: ffffffffffffffda RBX: 00007fffda186070 RCX: 000000000045951a RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011 RBP: 00007fffda1860b0 R08: 0000000000000001 R09: 00000000022de940 R10: 00000000022dec10 R11: 0000000000000246 R12: 0000000000000001 R13: 0000000000000000 R14: 0000000000000000 R15: 00007fffda186100 kobject: 'brport' (00000000eea7db34): kobject_cleanup, parent 00000000eb548e72 kobject: 'brport' (00000000eea7db34): calling ktype release kobject: 'brport': free name kobject: 'brport' (0000000012176417): kobject_cleanup, parent 00000000eb548e72 kobject: 'brport' (0000000012176417): calling ktype release kobject: 'brport': free name kobject: 'brport' (00000000962a600a): kobject_cleanup, parent 00000000eb548e72 kobject: 'brport' (00000000962a600a): calling ktype release kobject: 'brport': free name kobject: 'brport' (000000004797485a): kobject_cleanup, parent 00000000eb548e72 kobject: 'brport' (000000004797485a): calling ktype release kobject: 'brport': free name kobject: 'brport' (00000000fa73be35): kobject_cleanup, parent 00000000eb548e72 kobject: 'brport' (00000000fa73be35): calling ktype release kobject: 'brport': free name kobject: 'brport' (0000000078b0dcd4): kobject_cleanup, parent 00000000eb548e72 kobject: 'brport' (0000000078b0dcd4): calling ktype release kobject: 'brport': free name