kasan: CONFIG_KASAN_INLINE enabled
kasan: GPF could be caused by NULL-ptr deref or user memory access
general protection fault: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 16175 Comm: syz-executor.3 Not tainted 5.1.0-rc7+ #1
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:__read_once_size include/linux/compiler.h:193 [inline]
RIP: 0010:arch_atomic_read arch/x86/include/asm/atomic.h:31 [inline]
RIP: 0010:atomic_read include/asm-generic/atomic-instrumented.h:27 [inline]
RIP: 0010:refcount_sub_and_test_checked+0x8e/0x200 lib/refcount.c:182
Code: f3 f3 65 48 8b 04 25 28 00 00 00 48 89 45 d0 31 c0 e8 b6 35 40 fe be 04 00 00 00 48 89 df e8 49 26 78 fe 48 89 d8 48 c1 e8 03 <42> 0f b6 14 20 48 89 d8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85
RSP: 0018:ffff888052a87bc8 EFLAGS: 00010202
RAX: 0000000000000019 RBX: 00000000000000c8 RCX: ffffffff83305707
RDX: 0000000000000000 RSI: 0000000000000004 RDI: 00000000000000c8
RBP: ffff888052a87c60 R08: 1ffffffff1284d90 R09: fffffbfff1284d91
R10: fffffbfff1284d90 R11: ffffffff89426c83 R12: dffffc0000000000
R13: 0000000000000000 R14: ffff888052a87c38 R15: 1ffff1100a550f7b
FS:  00007f58aae97700(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffe27d17948 CR3: 0000000070730000 CR4: 00000000001406f0
Call Trace:
 refcount_dec_and_test_checked+0x1b/0x20 lib/refcount.c:220
 x25_neigh_put include/net/x25.h:252 [inline]
 x25_connect+0x8d8/0xea0 net/x25/af_x25.c:825
 __sys_connect+0x266/0x330 net/socket.c:1808
 __do_sys_connect net/socket.c:1819 [inline]
 __se_sys_connect net/socket.c:1816 [inline]
 __x64_sys_connect+0x73/0xb0 net/socket.c:1816
 do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x458da9
Code: ad b8 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 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 0f 83 7b b8 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f58aae96c78 EFLAGS: 00000246 ORIG_RAX: 000000000000002a
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000458da9
RDX: 0000000000000012 RSI: 0000000020000040 RDI: 0000000000000004
RBP: 000000000073bfa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f58aae976d4
R13: 00000000004bf2f8 R14: 00000000004d0470 R15: 00000000ffffffff
Modules linked in:
---[ end trace 5e06e15e892cc16c ]---
RIP: 0010:__read_once_size include/linux/compiler.h:193 [inline]
RIP: 0010:arch_atomic_read arch/x86/include/asm/atomic.h:31 [inline]
RIP: 0010:atomic_read include/asm-generic/atomic-instrumented.h:27 [inline]
RIP: 0010:refcount_sub_and_test_checked+0x8e/0x200 lib/refcount.c:182
Code: f3 f3 65 48 8b 04 25 28 00 00 00 48 89 45 d0 31 c0 e8 b6 35 40 fe be 04 00 00 00 48 89 df e8 49 26 78 fe 48 89 d8 48 c1 e8 03 <42> 0f b6 14 20 48 89 d8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85