------------[ cut here ]------------ refcount_t: decrement hit 0; leaking memory. WARNING: lib/refcount.c:31 at refcount_warn_saturate+0x70/0x110 lib/refcount.c:31, CPU#1: syz.3.6875/28162 Modules linked in: CPU: 1 UID: 0 PID: 28162 Comm: syz.3.6875 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026 RIP: 0010:refcount_warn_saturate+0x70/0x110 lib/refcount.c:31 Code: c6 c0 24 f0 8e e8 e0 7c 16 fd 83 fb 01 7e 22 83 fb 02 74 39 83 fb 03 74 47 83 fb 04 75 68 e8 47 77 16 fd 48 8d 3d 50 47 6d 0b <67> 48 0f b9 3a eb 66 85 db 74 3e 83 fb 01 75 4c e8 2b 77 16 fd 48 RSP: 0018:ffffc9000bfa7b48 EFLAGS: 00010283 RAX: ffffffff84af3729 RBX: 0000000000000004 RCX: 0000000000080000 RDX: ffffc9000ed8a000 RSI: 0000000000000037 RDI: ffffffff901c7e80 RBP: ffffc9000bfa7ca0 R08: ffff88807e0f0000 R09: 0000000000000005 R10: 0000000000000004 R11: 0000000000000002 R12: f8f8f8f8f8f8f8f8 R13: dffffc0000000000 R14: ffff888054d4c668 R15: 0000000000000001 FS: 00007f27863b46c0(0000) GS:ffff888125559000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000110c34e51c CR3: 000000003f0a0000 CR4: 00000000003526f0 Call Trace: __refcount_dec include/linux/refcount.h:461 [inline] refcount_dec include/linux/refcount.h:476 [inline] ref_tracker_free+0x6fc/0x840 lib/ref_tracker.c:298 netdev_tracker_free include/linux/netdevice.h:4456 [inline] netdev_put include/linux/netdevice.h:4473 [inline] dev_put include/linux/netdevice.h:4499 [inline] mpoad_close+0x1fc/0x3e0 net/atm/mpc.c:889 vcc_destroy_socket net/atm/common.c:181 [inline] vcc_release+0x10f/0x580 net/atm/common.c:205 __sock_release net/socket.c:662 [inline] sock_close+0xc3/0x240 net/socket.c:1455 __fput+0x44f/0xa70 fs/file_table.c:469 fput_close_sync+0x11f/0x240 fs/file_table.c:574 __do_sys_close fs/open.c:1509 [inline] __se_sys_close fs/open.c:1494 [inline] __x64_sys_close+0x7e/0x110 fs/open.c:1494 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f278819c819 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f27863b4028 EFLAGS: 00000246 ORIG_RAX: 0000000000000003 RAX: ffffffffffffffda RBX: 00007f2788416180 RCX: 00007f278819c819 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000004 RBP: 00007f2788232c91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f2788416218 R14: 00007f2788416180 R15: 00007fff26b31ac8 ---------------- Code disassembly (best guess), 1 bytes skipped: 0: c0 24 f0 8e shlb $0x8e,(%rax,%rsi,8) 4: e8 e0 7c 16 fd call 0xfd167ce9 9: 83 fb 01 cmp $0x1,%ebx c: 7e 22 jle 0x30 e: 83 fb 02 cmp $0x2,%ebx 11: 74 39 je 0x4c 13: 83 fb 03 cmp $0x3,%ebx 16: 74 47 je 0x5f 18: 83 fb 04 cmp $0x4,%ebx 1b: 75 68 jne 0x85 1d: e8 47 77 16 fd call 0xfd167769 22: 48 8d 3d 50 47 6d 0b lea 0xb6d4750(%rip),%rdi # 0xb6d4779 * 29: 67 48 0f b9 3a ud1 (%edx),%rdi <-- trapping instruction 2e: eb 66 jmp 0x96 30: 85 db test %ebx,%ebx 32: 74 3e je 0x72 34: 83 fb 01 cmp $0x1,%ebx 37: 75 4c jne 0x85 39: e8 2b 77 16 fd call 0xfd167769 3e: 48 rex.W