gretap0: mtu less than device minimum ------------[ cut here ]------------ refcount_t: decrement hit 0; leaking memory. WARNING: CPU: 0 PID: 24515 at lib/refcount.c:31 refcount_warn_saturate+0xfa/0x1d0 lib/refcount.c:31 Modules linked in: CPU: 0 PID: 24515 Comm: syz-executor.3 Not tainted 6.9.0-syzkaller-05151-g1b294a1f3561 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/02/2024 RIP: 0010:refcount_warn_saturate+0xfa/0x1d0 lib/refcount.c:31 Code: b2 00 00 00 e8 87 5d e6 fc 5b 5d c3 cc cc cc cc e8 7b 5d e6 fc c6 05 61 2d e7 0a 01 90 48 c7 c7 c0 5c 1f 8c e8 a7 b4 a8 fc 90 <0f> 0b 90 90 eb d9 e8 5b 5d e6 fc c6 05 3e 2d e7 0a 01 90 48 c7 c7 RSP: 0018:ffffc900039ef748 EFLAGS: 00010246 RAX: cac7eceb9bc68b00 RBX: ffff88802cb26664 RCX: ffff88806b4d8000 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000 RBP: 0000000000000004 R08: ffffffff8158b702 R09: fffffbfff1c39d5c R10: dffffc0000000000 R11: fffffbfff1c39d5c R12: ffff88802cb26620 R13: 0000000000000000 R14: ffff88802cb26664 R15: dffffc0000000000 FS: 0000000000000000(0000) GS:ffff8880b9400000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b33731000 CR3: 000000000e134000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __refcount_dec include/linux/refcount.h:336 [inline] refcount_dec include/linux/refcount.h:351 [inline] ref_tracker_free+0x6af/0x7e0 lib/ref_tracker.c:236 netdev_tracker_free include/linux/netdevice.h:4058 [inline] netdev_put include/linux/netdevice.h:4075 [inline] ax25_release+0x368/0x950 net/ax25/af_ax25.c:1069 __sock_release net/socket.c:659 [inline] sock_close+0xbc/0x240 net/socket.c:1421 __fput+0x429/0x8a0 fs/file_table.c:422 task_work_run+0x24f/0x310 kernel/task_work.c:180 exit_task_work include/linux/task_work.h:38 [inline] do_exit+0xa1b/0x27e0 kernel/exit.c:878 do_group_exit+0x207/0x2c0 kernel/exit.c:1027 get_signal+0x16a1/0x1740 kernel/signal.c:2911 arch_do_signal_or_restart+0x96/0x860 arch/x86/kernel/signal.c:310 exit_to_user_mode_loop kernel/entry/common.c:111 [inline] exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline] __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline] syscall_exit_to_user_mode+0xc9/0x370 kernel/entry/common.c:218 do_syscall_64+0x102/0x240 arch/x86/entry/common.c:89 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fa72607cee9 Code: Unable to access opcode bytes at 0x7fa72607cebf. RSP: 002b:00007fa726da3178 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: 0000000000000001 RBX: 00007fa7261abf88 RCX: 00007fa72607cee9 RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00007fa7261abf8c RBP: 00007fa7261abf80 R08: 7fffffffffffffff R09: 00007fa726da36c0 R10: ffffffffffffffff R11: 0000000000000246 R12: 00007fa7261abf8c R13: 000000000000000b R14: 00007ffebc6be390 R15: 00007ffebc6be478