RBP: 00007f2442eebca0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000030
R13: 00007ffe084906ef R14: 00007f2442eec9c0 R15: 000000000119bf8c
kasan: CONFIG_KASAN_INLINE enabled
kasan: GPF could be caused by NULL-ptr deref or user memory access
general protection fault: 0000 [#1] PREEMPT SMP KASAN
Modules linked in:
CPU: 0 PID: 4928 Comm: syz-executor.1 Not tainted 4.14.215-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff888075618680 task.stack: ffff888099dc8000
RIP: 0010:sysfs_do_create_link_sd+0x56/0x120 fs/sysfs/symlink.c:35
RSP: 0018:ffff888099dcfb48 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: 0000000000000010 RCX: 0000000000006829
RDX: 0000000000000008 RSI: 0000000000000001 RDI: 0000000000000040
RBP: ffffffff87cb9b60 R08: ffffffff8b9bdc08 R09: 00000000000400c6
R10: ffff888075618f30 R11: ffff888075618680 R12: ffff8880aef588c0
R13: ffffffff87cb9b60 R14: 0000000000000001 R15: ffff8880944b73dc
FS:  00007f2442eec700(0000) GS:ffff8880ba400000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f97d6d80050 CR3: 00000000a4e42000 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+0x5f/0xc0 fs/sysfs/symlink.c:92
 device_add_disk+0x9f8/0xdc0 block/genhd.c:688
 add_disk include/linux/genhd.h:396 [inline]
 loop_add+0x615/0x830 drivers/block/loop.c:1904
 loop_control_ioctl+0x161/0x3f0 drivers/block/loop.c:2027
 vfs_ioctl fs/ioctl.c:46 [inline]
 file_ioctl fs/ioctl.c:500 [inline]
 do_vfs_ioctl+0x75a/0xff0 fs/ioctl.c:684
 SYSC_ioctl fs/ioctl.c:701 [inline]
 SyS_ioctl+0x7f/0xb0 fs/ioctl.c:692
 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x46/0xbb
RIP: 0033:0x45e219
RSP: 002b:00007f2442eebc68 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 000000000045e219
RDX: 0000000000000000 RSI: 0000000000004c82 RDI: 0000000000000004
RBP: 00007f2442eebca0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000030
R13: 00007ffe084906ef R14: 00007f2442eec9c0 R15: 000000000119bf8c
Code: 84 a1 00 00 00 e8 8b 18 b1 ff 48 c7 c7 40 c2 04 89 e8 7f a7 7a 05 48 8d 7b 30 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 a7 00 00 00 4c 8b 6b 30 4d 85 ed 74 4f e8 52 
RIP: sysfs_do_create_link_sd+0x56/0x120 fs/sysfs/symlink.c:35 RSP: ffff888099dcfb48
---[ end trace 474237c80f0e6394 ]---