------------[ cut here ]------------ refcount_t: decrement hit 0; leaking memory. WARNING: CPU: 1 PID: 15199 at lib/refcount.c:31 refcount_warn_saturate+0xbf/0x1e0 lib/refcount.c:31 Modules linked in: CPU: 1 PID: 15199 Comm: syz-executor.2 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:ffffc90000dc0e10 EFLAGS: 00010286 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 RDX: ffff888020958000 RSI: ffffffff815c4d85 RDI: fffff520001b81b4 RBP: 0000000000000004 R08: 0000000000000000 R09: 0000000000000000 R10: ffffffff815bdb1e R11: 0000000000000000 R12: ffff888046578000 R13: ffff888046578568 R14: ffff88801cc085e0 R15: 0000000000000000 FS: 00007f60bc72b700(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000540198 CR3: 00000000522fd000 CR4: 00000000001506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 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:batadv_hardif_get_by_netdev+0x150/0x400 net/batman-adv/hard-interface.c:71 Code: 92 02 00 00 4d 8b 24 24 49 81 fc a0 ea 21 90 0f 84 b4 01 00 00 e8 50 d4 cf f8 49 8d 7c 24 18 48 89 f8 48 c1 e8 03 80 3c 18 00 <0f> 85 73 02 00 00 4d 39 6c 24 18 75 b7 e8 2e d4 cf f8 49 8d 6c 24 RSP: 0018:ffffc90016df7918 EFLAGS: 00000246 RAX: 1ffff110035d5f03 RBX: dffffc0000000000 RCX: ffffc9000dad4000 RDX: 0000000000040000 RSI: ffffffff88a41d90 RDI: ffff88801aeaf818 RBP: ffff8880190b4000 R08: 0000000000000000 R09: 0000000000000001 R10: ffffffff88a41fc5 R11: 0000000000000000 R12: ffff88801aeaf800 R13: ffff8880190b4000 R14: 0000000000000000 R15: ffffffff8da9fa60 batadv_hard_if_event+0x90/0x15b0 net/batman-adv/hard-interface.c:995 notifier_call_chain+0xb5/0x200 kernel/notifier.c:83 call_netdevice_notifiers_info+0xb5/0x130 net/core/dev.c:2121 call_netdevice_notifiers_extack net/core/dev.c:2133 [inline] call_netdevice_notifiers net/core/dev.c:2147 [inline] register_netdevice+0xa5a/0x1500 net/core/dev.c:10251 ip6gre_tunnel_locate net/ipv6/ip6_gre.c:381 [inline] ip6gre_tunnel_ioctl+0x1087/0x1720 net/ipv6/ip6_gre.c:1298 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:00007f60bc72b188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 000000000056bf60 RCX: 0000000000466459 RDX: 0000000020000000 RSI: 00000000000089f1 RDI: 0000000000000004 RBP: 00000000004bf9fb R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf60 R13: 00007ffd7a398fef R14: 00007f60bc72b300 R15: 0000000000022000