------------[ cut here ]------------ refcount_t: decrement hit 0; leaking memory. WARNING: CPU: 0 PID: 482 at lib/refcount.c:31 refcount_warn_saturate+0xbf/0x1e0 lib/refcount.c:31 Modules linked in: CPU: 0 PID: 482 Comm: syz-executor.4 Not tainted 5.12.0-rc4-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:refcount_warn_saturate+0xbf/0x1e0 lib/refcount.c:31 Code: 1d 3b 53 e8 09 31 ff 89 de e8 fd e7 aa fd 84 db 75 e0 e8 44 e1 aa fd 48 c7 c7 a0 e8 c1 89 c6 05 1b 53 e8 09 01 e8 0e d8 fa 04 <0f> 0b eb c4 e8 28 e1 aa fd 0f b6 1d 0a 53 e8 09 31 ff 89 de e8 c8 RSP: 0018:ffffc90000007e10 EFLAGS: 00010286 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 RDX: ffff8880476e8000 RSI: ffffffff815c4d85 RDI: fffff52000000fb4 RBP: 0000000000000004 R08: 0000000000000000 R09: 0000000000000000 R10: ffffffff815bdb1e R11: 0000000000000000 R12: ffff88805b8c6000 R13: ffff88805b8c6568 R14: ffff888023222de0 R15: 0000000000000000 FS: 00007f3692945700(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b31f22000 CR3: 000000002d6a2000 CR4: 00000000001506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: __refcount_dec include/linux/refcount.h:344 [inline] refcount_dec include/linux/refcount.h:359 [inline] dev_put include/linux/netdevice.h:4135 [inline] in_dev_finish_destroy+0x172/0x1b0 net/ipv4/devinet.c:244 in_dev_put include/linux/inetdevice.h:265 [inline] in_dev_rcu_put+0x83/0xb0 net/ipv4/devinet.c:301 rcu_do_batch kernel/rcu/tree.c:2559 [inline] rcu_core+0x74a/0x12f0 kernel/rcu/tree.c:2794 __do_softirq+0x29b/0x9f6 kernel/softirq.c:345 invoke_softirq kernel/softirq.c:221 [inline] __irq_exit_rcu kernel/softirq.c:422 [inline] irq_exit_rcu+0x134/0x200 kernel/softirq.c:434 sysvec_apic_timer_interrupt+0x93/0xc0 arch/x86/kernel/apic/apic.c:1100 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:632 RIP: 0010:preempt_count arch/x86/include/asm/preempt.h:27 [inline] RIP: 0010:check_kcov_mode kernel/kcov.c:163 [inline] RIP: 0010:__sanitizer_cov_trace_pc+0x0/0x60 kernel/kcov.c:197 Code: f0 4d 89 03 e9 f2 fc ff ff b9 ff ff ff ff ba 08 00 00 00 4d 8b 03 48 0f bd ca 49 8b 45 00 48 63 c9 e9 64 ff ff ff 0f 1f 40 00 <65> 8b 05 d9 fd 8d 7e 89 c1 48 8b 34 24 81 e1 00 01 00 00 65 48 8b RSP: 0018:ffffc90002097708 EFLAGS: 00000212 RAX: 0000000000012933 RBX: 0000000000000200 RCX: ffffc90001d79000 RDX: 0000000000040000 RSI: ffffffff814a744d RDI: 0000000000000003 RBP: 0000000000000008 R08: 0000000000000000 R09: ffffffff8fac58c7 R10: ffffffff814a7443 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000001 R14: ffff888010869000 R15: 00000000ffffff00 queue_work_on+0xb3/0x110 kernel/workqueue.c:1529 queue_work include/linux/workqueue.h:507 [inline] call_usermodehelper_exec+0x1f0/0x4c0 kernel/umh.c:433 kobject_uevent_env+0xf9f/0x1680 lib/kobject_uevent.c:617 __kobject_del+0x16c/0x200 lib/kobject.c:617 kobject_cleanup lib/kobject.c:696 [inline] kobject_release lib/kobject.c:736 [inline] kref_put include/linux/kref.h:65 [inline] kobject_put+0x2b6/0x540 lib/kobject.c:753 net_rx_queue_update_kobjects+0x3c1/0x4e0 net/core/net-sysfs.c:1074 remove_queue_kobjects net/core/net-sysfs.c:1766 [inline] netdev_unregister_kobject+0x14f/0x1f0 net/core/net-sysfs.c:1917 unregister_netdevice_many+0xcf0/0x1780 net/core/dev.c:11027 unregister_netdevice_queue+0x2dd/0x3c0 net/core/dev.c:10934 unregister_netdevice include/linux/netdevice.h:2969 [inline] ip6gre_tunnel_ioctl+0x7a1/0x1720 net/ipv6/ip6_gre.c:1347 dev_do_ioctl net/core/dev_ioctl.c:230 [inline] dev_ifsioc+0x90d/0xa60 net/core/dev_ioctl.c:336 dev_ioctl+0x277/0xb70 net/core/dev_ioctl.c:530 sock_ioctl+0x50d/0x6a0 net/socket.c:1104 vfs_ioctl fs/ioctl.c:48 [inline] __do_sys_ioctl fs/ioctl.c:753 [inline] __se_sys_ioctl fs/ioctl.c:739 [inline] __x64_sys_ioctl+0x193/0x200 fs/ioctl.c:739 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x466459 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 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f3692945188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 000000000056bf60 RCX: 0000000000466459 RDX: 0000000020000000 RSI: 00000000000089f2 RDI: 0000000000000005 RBP: 00000000004bf9fb R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf60 R13: 00007ffda0abe96f R14: 00007f3692945300 R15: 0000000000022000