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: 6634 Comm: syz-executor5 Not tainted 4.9.43-ge63ae19 #26
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8801c740b000 task.stack: ffff8801aa548000
RIP: 0010:[<ffffffff824b07f8>]  [<ffffffff824b07f8>] loop_set_fd drivers/block/loop.c:894 [inline]
RIP: 0010:[<ffffffff824b07f8>]  [<ffffffff824b07f8>] lo_ioctl+0x5a8/0x1990 drivers/block/loop.c:1340
RSP: 0018:ffff8801aa54fb48  EFLAGS: 00010206
RAX: 0000000000000036 RBX: dffffc0000000000 RCX: ffffc90003d0f000
RDX: 0000000000000054 RSI: 0000000000000002 RDI: 00000000000001b0
RBP: ffff8801aa54fbc8 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 1ffff100354a9f26 R12: 0000000000000000
R13: ffff8801d57a0000 R14: 0000000000000000 R15: ffff8801d9c16d40
FS:  00007fa8fb125700(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fff5082aff0 CR3: 00000001aa723000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 ffffffff81bd8b8c ffffffff81bd8872 0000000000006000 ffff8801d57a0150
 0000000000700000 ffff8801d9c16540 ffff8801d9c16350 ffff8801d9963600
 ffff8801d9c16e20 000000000002001d ffff8801d57a0158 ffff8801d9c16d40
Call Trace:
 [<ffffffff81d35a9a>] __blkdev_driver_ioctl block/ioctl.c:294 [inline]
 [<ffffffff81d35a9a>] blkdev_ioctl+0x4aa/0x1a60 block/ioctl.c:590
 [<ffffffff8162a5ae>] block_ioctl+0xde/0x120 fs/block_dev.c:1686
 [<ffffffff815ac74a>] vfs_ioctl fs/ioctl.c:43 [inline]
 [<ffffffff815ac74a>] do_vfs_ioctl+0x1aa/0x10c0 fs/ioctl.c:679
 [<ffffffff815ad6ef>] SYSC_ioctl fs/ioctl.c:694 [inline]
 [<ffffffff815ad6ef>] SyS_ioctl+0x8f/0xc0 fs/ioctl.c:685
 [<ffffffff838a6805>] entry_SYSCALL_64_fastpath+0x23/0xc6
Code: 00 00 00 48 89 f8 48 c1 e8 03 80 3c 18 00 0f 85 ee 12 00 00 4d 8b a4 24 f0 00 00 00 49 8d bc 24 b0 01 00 00 48 89 f8 48 c1 e8 03 <80> 3c 18 00 0f 85 e4 12 00 00 4d 8b a4 24 b0 01 00 00 4c 89 e0 
RIP  [<ffffffff824b07f8>] loop_set_fd drivers/block/loop.c:894 [inline]
RIP  [<ffffffff824b07f8>] lo_ioctl+0x5a8/0x1990 drivers/block/loop.c:1340
 RSP <ffff8801aa54fb48>
---[ end trace 85a6d9e92ec53fb2 ]---
Kernel panic - not syncing: Fatal exception
TCP: tcp_parse_options: Illegal window scaling value 255 >14 received
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..