blk_update_request: I/O error, dev loop0, sector 1280
blk_update_request: I/O error, dev loop0, sector 1535
device veth0_to_bridge left promiscuous mode
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: 7965 Comm: syz-executor0 Not tainted 4.4.148-gf057ff9 #81
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8801d6a6b000 task.stack: ffff8801d4e58000
RIP: 0010:[<ffffffff8251b9ad>]  [<ffffffff8251b9ad>] loop_validate_file+0x20d/0x400 drivers/block/loop.c:667
RSP: 0018:ffff8801d4e5fb70  EFLAGS: 00010206
RAX: 0000000000000036 RBX: dffffc0000000000 RCX: ffffc90000c54000
RDX: 0000000000000087 RSI: ffffffff8251b97d RDI: 00000000000001b0
RBP: ffff8801d4e5fb88 R08: ffff8801d6a6b928 R09: 0000000000000001
R10: 0000000000000000 R11: ffff8801d6a6b000 R12: 0000000000000000
R13: ffff8800b9c79700 R14: ffff8800b9c79700 R15: ffff8801d6a4c158
FS:  00007f7f889fd700(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000400200 CR3: 00000001d7171000 CR4: 00000000001606f0
Stack:
 ffff8801d6a4c000 ffff8800b662c800 0000000000000004 ffff8801d4e5fc18
 ffffffff82521f0d 0000000b0000004c 0000000100000006 0000000000000000
 0000000300000001 ffff8801d6a4c018 0000000041b58ab3 ffffffff84208558
Call Trace:
 [<ffffffff82521f0d>] loop_change_fd drivers/block/loop.c:713 [inline]
 [<ffffffff82521f0d>] lo_ioctl+0x3ed/0x16c0 drivers/block/loop.c:1370
 [<ffffffff81dbd6e8>] __blkdev_driver_ioctl block/ioctl.c:288 [inline]
 [<ffffffff81dbd6e8>] blkdev_ioctl+0x7b8/0x19c0 block/ioctl.c:584
 [<ffffffff815d7ffe>] block_ioctl+0xde/0x120 fs/block_dev.c:1625
 [<ffffffff8155dadf>] vfs_ioctl fs/ioctl.c:43 [inline]
 [<ffffffff8155dadf>] file_ioctl fs/ioctl.c:470 [inline]
 [<ffffffff8155dadf>] do_vfs_ioctl+0x63f/0xf40 fs/ioctl.c:605
 [<ffffffff8155e46f>] SYSC_ioctl fs/ioctl.c:622 [inline]
 [<ffffffff8155e46f>] SyS_ioctl+0x8f/0xc0 fs/ioctl.c:613
 [<ffffffff838ca6a5>] entry_SYSCALL_64_fastpath+0x22/0x9e
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  [<ffffffff8251b9ad>] loop_validate_file+0x20d/0x400 drivers/block/loop.c:667
 RSP <ffff8801d4e5fb70>
---[ end trace faa48c71934ec1c7 ]---