------------[ 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.1.15513/21151
Modules linked in:
CPU: 1 UID: 0 PID: 21151 Comm: syz.1.15513 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 40 33 f0 8e e8 a0 56 16 fd 83 fb 01 7e 22 83 fb 02 74 39 83 fb 03 74 47 83 fb 04 75 68 e8 07 51 16 fd 48 8d 3d 50 2b 6d 0b <67> 48 0f b9 3a eb 66 85 db 74 3e 83 fb 01 75 4c e8 eb 50 16 fd 48
RSP: 0018:ffffc90004ef7b48 EFLAGS: 00010283
RAX: ffffffff84af63c9 RBX: 0000000000000004 RCX: 0000000000080000
RDX: ffffc90011451000 RSI: 0000000000000037 RDI: ffffffff901c8f20
RBP: ffffc90004ef7ca0 R08: ffff88802d681e80 R09: 0000000000000005
R10: 0000000000000004 R11: 0000000000000002 R12: f8f8f8f8f8f8f8f8
R13: dffffc0000000000 R14: ffff88805a7a0668 R15: 0000000000000001
FS: 00007f7c7da6e6c0(0000) GS:ffff888125557000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f7c7da6dff8 CR3: 000000009b202000 CR4: 00000000003526f0
Call Trace:
<TASK>
__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: 0033:0x7f7c7cb9c819
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:00007f7c7da6e028 EFLAGS: 00000246 ORIG_RAX: 0000000000000003
RAX: ffffffffffffffda RBX: 00007f7c7ce16180 RCX: 00007f7c7cb9c819
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000004
RBP: 00007f7c7cc32c91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f7c7ce16218 R14: 00007f7c7ce16180 R15: 00007ffc6b865318
</TASK>
----------------
Code disassembly (best guess):
0: c6 40 33 f0 movb $0xf0,0x33(%rax)
4: 8e e8 mov %eax,%gs
6: a0 56 16 fd 83 fb 01 movabs 0x227e01fb83fd1656,%al
d: 7e 22
f: 83 fb 02 cmp $0x2,%ebx
12: 74 39 je 0x4d
14: 83 fb 03 cmp $0x3,%ebx
17: 74 47 je 0x60
19: 83 fb 04 cmp $0x4,%ebx
1c: 75 68 jne 0x86
1e: e8 07 51 16 fd call 0xfd16512a
23: 48 8d 3d 50 2b 6d 0b lea 0xb6d2b50(%rip),%rdi # 0xb6d2b7a
* 2a: 67 48 0f b9 3a ud1 (%edx),%rdi <-- trapping instruction
2f: eb 66 jmp 0x97
31: 85 db test %ebx,%ebx
33: 74 3e je 0x73
35: 83 fb 01 cmp $0x1,%ebx
38: 75 4c jne 0x86
3a: e8 eb 50 16 fd call 0xfd16512a
3f: 48 rex.W