kasan: CONFIG_KASAN_INLINE enabled
kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN
Dumping ftrace buffer:
   (ftrace buffer empty)
Modules linked in:
CPU: 1 PID: 5863 Comm: syz-executor7 Not tainted 4.4.152-ge5c5f1f #25
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8800b5dbe000 task.stack: ffff8801bf2d0000
RIP: 0010:[<ffffffff8251d54d>]  [<ffffffff8251d54d>] loop_validate_file+0x20d/0x400 drivers/block/loop.c:667
blk_update_request: I/O error, dev loop0, sector 15232
Buffer I/O error on dev loop0, logical block 1904, lost async page write
blk_update_request: I/O error, dev loop0, sector 1240
Buffer I/O error on dev loop0, logical block 155, lost async page write
RSP: 0018:ffff8801bf2d7ad0  EFLAGS: 00010206
RAX: 0000000000000036 RBX: dffffc0000000000 RCX: ffffc9000226b000
RDX: 000000000000008b RSI: ffffffff8251d51d RDI: 00000000000001b0
RBP: ffff8801bf2d7ae8 R08: ffff8800b5dbe928 R09: 0000000000000001
R10: 0000000000000000 R11: ffff8800b5dbe000 R12: 0000000000000000
R13: ffff8801d33c05c0 R14: ffff8801d33c05c0 R15: ffff8801d6a81c58
FS:  0000000000000000(0000) GS:ffff8801db300000(0063) knlGS:00000000f56fbb40
CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 00007f8a92a40270 CR3: 00000001d4823000 CR4: 00000000001606f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 ffff8801d6a81b00 ffff8800b541b200 0000000000000003 ffff8801bf2d7b78
 ffffffff82523aad ffff8801d4ab5060 ffff880100000001 ffff8801d6a81b10
 ffff8801d6a81d38 ffff8801d6a81b18 ffffffff00001000 f6fccecdd4d660ae
Call Trace:
 [<ffffffff82523aad>] loop_change_fd drivers/block/loop.c:713 [inline]
 [<ffffffff82523aad>] lo_ioctl+0x3ed/0x16c0 drivers/block/loop.c:1370
 [<ffffffff82524e32>] lo_compat_ioctl+0xb2/0x140 drivers/block/loop.c:1560
 [<ffffffff81e07af5>] compat_blkdev_ioctl+0x395/0x3a10 block/compat_ioctl.c:751
 [<ffffffff8162e354>] C_SYSC_ioctl fs/compat_ioctl.c:1592 [inline]
 [<ffffffff8162e354>] compat_SyS_ioctl+0x484/0x2270 fs/compat_ioctl.c:1544
Can not set IPV6_FL_F_REFLECT if flowlabel_consistency sysctl is enable
Can not set IPV6_FL_F_REFLECT if flowlabel_consistency sysctl is enable
 [<ffffffff81006d94>] do_syscall_32_irqs_on arch/x86/entry/common.c:393 [inline]
 [<ffffffff81006d94>] do_fast_syscall_32+0x324/0x8b0 arch/x86/entry/common.c:460
 [<ffffffff838cdec3>] sysenter_flags_fixed+0xd/0x1a
Code: 00 00 00 48 89 [   82.227011] Can not set IPV6_FL_F_REFLECT if flowlabel_consistency sysctl is enable
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 [   82.259497] Can not set IPV6_FL_F_REFLECT if flowlabel_consistency sysctl is enable
4c 89 e0 
RIP  [<ffffffff8251d54d>] loop_validate_file+0x20d/0x400 drivers/block/loop.c:667
 RSP <ffff8801bf2d7ad0>
Can not set IPV6_FL_F_REFLECT if flowlabel_consistency sysctl is enable
---[ end trace 4a10de0d8af3bbf9 ]---