FAT-fs (loop2): bogus number of reserved sectors
FAT-fs (loop2): Can't find a valid FAT filesystem
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
Dumping ftrace buffer:
   (ftrace buffer empty)
Modules linked in:
CPU: 1 PID: 10313 Comm: syz-executor2 Not tainted 4.9.118-g856452b #21
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff88019db4e000 task.stack: ffff8801cbb30000
RIP: 0010:[<ffffffff81edc64f>]  [<ffffffff81edc64f>] vsscanf+0x33f/0x2430 lib/vsprintf.c:2680
RSP: 0018:ffff8801cbb374e8  EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffffffff841a3c41 RCX: ffffc90001513000
RDX: 0000000000000000 RSI: ffffffff81edc642 RDI: ffffffff841a3c40
RBP: ffff8801cbb37698 R08: ffff8801cbb37860 R09: ffff8801cbb37864
R10: 0000000000000000 R11: 0000000000000000 R12: ffffffff841a3c41
R13: 0000000000000064 R14: dffffc0000000000 R15: 0000000000000000
FS:  00007f92ecd08700(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fffda5b9ec8 CR3: 00000001bfc50000 CR4: 00000000001606f0
Stack:
 ffff88019db4e000 fffffbfff07c4739 1ffff10039766ea6 0000000000000000
 00000000000002ff 00000000cbb37530 ffffffff8123ffff ffff8801cbb376c8
 ffffffff841a3c64 0000000041b58ab3 ffffffff843e4e60 ffffffff81edc310
Call Trace:
 [<ffffffff81ede7eb>] sscanf+0xab/0xe0 lib/vsprintf.c:2885
 [<ffffffff839c8707>] valid_ipaddr4 net/9p/trans_fd.c:900 [inline]
 [<ffffffff839c8707>] p9_fd_create_tcp+0x127/0x430 net/9p/trans_fd.c:940
 [<ffffffff839b6fdf>] p9_client_create+0x6ff/0x10a0 net/9p/client.c:1036
 [<ffffffff8195b5d3>] v9fs_session_init+0x333/0x13a0 fs/9p/v9fs.c:343
 [<ffffffff8194cecd>] v9fs_mount+0x7d/0x810 fs/9p/vfs_super.c:130
 [<ffffffff8157e5fc>] mount_fs+0x28c/0x370 fs/super.c:1206
 [<ffffffff815dde21>] vfs_kern_mount.part.29+0xd1/0x3d0 fs/namespace.c:991
 [<ffffffff815e5749>] vfs_kern_mount fs/namespace.c:973 [inline]
 [<ffffffff815e5749>] do_new_mount fs/namespace.c:2513 [inline]
 [<ffffffff815e5749>] do_mount+0x3c9/0x2740 fs/namespace.c:2835
 [<ffffffff815e849e>] SYSC_mount fs/namespace.c:3051 [inline]
 [<ffffffff815e849e>] SyS_mount+0xfe/0x110 fs/namespace.c:3028
 [<ffffffff81006316>] do_syscall_64+0x1a6/0x490 arch/x86/entry/common.c:282
 [<ffffffff839fca93>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb
Code: ff 45 84 ed 0f 84 c9 fe ff ff e8 7d 24 48 ff 41 80 fd 6e 0f 84 34 02 00 00 e8 6e 24 48 ff 4c 89 f8 4c 89 fa 48 c1 e8 03 83 e2 07 <42> 0f b6 04 30 38 d0 7f 08 84 c0 0f 85 dd 17 00 00 41 80 3f 00 
RIP  [<ffffffff81edc64f>] vsscanf+0x33f/0x2430 lib/vsprintf.c:2680
 RSP <ffff8801cbb374e8>
---[ end trace b936b736d160b526 ]---