RBP: 0000000000000082 R08: 00007f2b6b06db20 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000004ba65d
R13: 00007f2b6b06dbb8 R14: 00000000004ba65d R15: 0000000000000000
kasan: CONFIG_KASAN_INLINE enabled
kasan: GPF could be caused by NULL-ptr deref or user memory access
general protection fault: 0000 [#1] SMP KASAN
Modules linked in:
CPU: 0 PID: 4236 Comm: syz-executor2 Not tainted 4.12.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8801c99fc000 task.stack: ffff8801cb310000
RIP: 0010:sysfs_do_create_link_sd.isra.2+0x48/0xf0 fs/sysfs/symlink.c:35
RSP: 0018:ffff8801cb317628 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: ffffffff8714fac0 RCX: 0000000000000000
RDX: 0000000000000008 RSI: ffff8801c99fc870 RDI: ffffffff88007844
RBP: ffff8801cb317650 R08: 000000000000000c R09: 2d3095780206e719
R10: ffff8801c99fc870 R11: ffff8801c99fc000 R12: ffff8801c9996308
R13: 0000000000000040 R14: 0000000000000001 R15: ffff8801ce88e580
FS:  00007f2b6b06e700(0000) GS:ffff8801dac00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fc8a466ca20 CR3: 00000001ceca4000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 sysfs_do_create_link fs/sysfs/symlink.c:80 [inline]
 sysfs_create_link+0x43/0xb0 fs/sysfs/symlink.c:92
 device_add_disk+0xb19/0xf60 block/genhd.c:631
 add_disk include/linux/genhd.h:404 [inline]
 loop_add+0x5d4/0x7f0 drivers/block/loop.c:1845
 loop_probe+0x15a/0x190 drivers/block/loop.c:1917
 kobj_lookup+0x20d/0x410 drivers/base/map.c:124
 get_gendisk+0x2d/0x1d0 block/genhd.c:728
 bd_start_claiming fs/block_dev.c:1107 [inline]
 blkdev_get+0x100/0x9d0 fs/block_dev.c:1593
 blkdev_get_by_path+0x37/0x70 fs/block_dev.c:1678
 mount_bdev+0x43/0x330 fs/super.c:1078
 fuse_mount_blk+0x10/0x20 fs/fuse/inode.c:1219
 mount_fs+0x7f/0x269 fs/super.c:1223
 vfs_kern_mount.part.32+0xbf/0x5c0 fs/namespace.c:977
 vfs_kern_mount fs/namespace.c:967 [inline]
 do_new_mount fs/namespace.c:2513 [inline]
 do_mount+0x372/0x2cc0 fs/namespace.c:2835
 SYSC_mount fs/namespace.c:3051 [inline]
 SyS_mount+0xb8/0xd0 fs/namespace.c:3028
 entry_SYSCALL_64_fastpath+0x23/0xc2
RIP: 0033:0x455ac9
RSP: 002b:00007f2b6b06db08 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 0000000000455ac9
RDX: 00000000004ba385 RSI: 0000000020000080 RDI: 00000000200000c0
RBP: 0000000000000082 R08: 00007f2b6b06db20 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000004ba65d
R13: 00007f2b6b06dbb8 R14: 00000000004ba65d R15: 0000000000000000
Code: 41 55 49 89 f5 41 54 49 89 fc 48 c7 c7 40 78 00 88 53 48 89 d3 e8 a9 62 ff 04 4c 89 ea 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 <80> 3c 02 00 0f 85 86 00 00 00 4d 8b 6d 00 4d 85 ed 74 52 4c 89 
RIP: sysfs_do_create_link_sd.isra.2+0x48/0xf0 fs/sysfs/symlink.c:35 RSP: ffff8801cb317628
---[ end trace 6834d1957a4a13e9 ]---