Buffer I/O error on dev loop3, logical block 6, lost async page write
Buffer I/O error on dev loop3, logical block 7, lost async page write
Buffer I/O error on dev loop3, logical block 8, lost async page write
Buffer I/O error on dev loop3, logical block 9, 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: 23751 Comm: syz-executor5 Not tainted 4.9.113-g47bbcd6 #14
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8801b82ac800 task.stack: ffff8801c02b0000
RIP: 0010:[<ffffffff825c4eed>]  [<ffffffff825c4eed>] loop_validate_file+0x20d/0x400 drivers/block/loop.c:656
RSP: 0018:ffff8801c02b7c80  EFLAGS: 00010206
RAX: 0000000000000036 RBX: dffffc0000000000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff825c4ebd RDI: 00000000000001b0
RBP: ffff8801c02b7c98 R08: ffff8801b82ad110 R09: 0000000000000001
R10: 0000000000000000 R11: 1ffff10037055a1d R12: 0000000000000000
R13: ffff8801cbff0000 R14: ffff8801cbff0000 R15: ffff8801d5ceb2d8
FS:  0000000000000000(0000) GS:ffff8801db300000(0063) knlGS:00000000f7738b40
CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 00007f6070fe0df8 CR3: 00000001c03f0000 CR4: 00000000001606f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 ffff8801d5ceb180 0000000000004c00 ffff8801bbaeac00 ffff8801c02b7d20
 ffffffff825ca8f7 ffff8801ffffffff ffffffff81235a3b ffff8801d3f9c590
 0000000000000001 ffff8801d42b62b8 ffff8801d5ceb2d0 c7284d18b6de57f8
Call Trace:
 [<ffffffff825ca8f7>] loop_set_fd drivers/block/loop.c:909 [inline]
 [<ffffffff825ca8f7>] lo_ioctl+0x6a7/0x1690 drivers/block/loop.c:1356
 [<ffffffff825cb992>] lo_compat_ioctl+0xb2/0x140 drivers/block/loop.c:1549
 [<ffffffff81ea4a55>] compat_blkdev_ioctl+0x3a5/0x3ad0 block/compat_ioctl.c:751
 [<ffffffff8168ec36>] C_SYSC_ioctl fs/compat_ioctl.c:1602 [inline]
 [<ffffffff8168ec36>] 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
 [<ffffffff839fb690>] 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  [<ffffffff825c4eed>] loop_validate_file+0x20d/0x400 drivers/block/loop.c:656
 RSP <ffff8801c02b7c80>
---[ end trace 2ca1a20151b06220 ]---