keychord: unsupported version 0
kasan: CONFIG_KASAN_INLINE enabled
blk_update_request: I/O error, dev loop0, sector 1664
Buffer I/O error on dev loop0, logical block 208, lost async page write
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: 6846 Comm: syz-executor1 Not tainted 4.9.119-g9dc978d #27
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8801aa3fb000 task.stack: ffff8801a7a60000
RIP: 0010:[<ffffffff825c6cad>]  [<ffffffff825c6cad>] loop_validate_file+0x20d/0x400 drivers/block/loop.c:656
RSP: 0018:ffff8801a7a67c80  EFLAGS: 00010206
RAX: 0000000000000036 RBX: dffffc0000000000 RCX: ffffc900058b1000
RDX: 000000000000008f RSI: ffffffff825c6c7d RDI: 00000000000001b0
RBP: ffff8801a7a67c98 R08: ffff8801aa3fb910 R09: 0000000000000001
R10: 0000000000000000 R11: 1ffff1003547f71d R12: 0000000000000000
R13: ffff8801d9c16780 R14: ffff8801d9c16780 R15: ffff8801d3951358
FS:  0000000000000000(0000) GS:ffff8801db300000(0063) knlGS:00000000f578fb40
CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 000000000811e854 CR3: 00000001cec25000 CR4: 00000000001606f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 ffff8801d3951200 ffff8801cc56be00 0000000000000004 ffff8801a7a67d20
 ffffffff825cc3fd dffffc00ffffffff ffff8801aa3fb8c8 ffff8801d615e270
 ffff8801d3951218 ffff8801d3c999f8 0000000000000000 1046e1e7867054fd
Call Trace:
 [<ffffffff825cc3fd>] loop_change_fd drivers/block/loop.c:702 [inline]
 [<ffffffff825cc3fd>] lo_ioctl+0x3ed/0x1690 drivers/block/loop.c:1359
 [<ffffffff825cd752>] lo_compat_ioctl+0xb2/0x140 drivers/block/loop.c:1549
 [<ffffffff81ea6395>] compat_blkdev_ioctl+0x3a5/0x3ad0 block/compat_ioctl.c:751
 [<ffffffff8168ecf6>] C_SYSC_ioctl fs/compat_ioctl.c:1602 [inline]
 [<ffffffff8168ecf6>] compat_SyS_ioctl+0x126/0x1fe0 fs/compat_ioctl.c:1549
 [<ffffffff81006da7>] do_syscall_32_irqs_on arch/x86/entry/common.c:325 [inline]
 [<ffffffff81006da7>] do_fast_syscall_32+0x2f7/0x870 arch/x86/entry/common.c:387
 [<ffffffff839fe3d0>] entry_SYSENTER_compat+0x90/0xa2 arch/x86/entry/entry_64_compat.S:137
Code: 00 00 00 48 89 f8 48 c1 e8 03 80 3c 18 00 0f 85 f7 01 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 cc 01 00 00 4d 8b a4 24 b0 01 00 00 4c 89 e0 
RIP  [<ffffffff825c6cad>] loop_validate_file+0x20d/0x400 drivers/block/loop.c:656
 RSP <ffff8801a7a67c80>
---[ end trace 8df470a1f1f8d2ce ]---