------------[ cut here ]------------
WARNING: CPU: 0 PID: 10246 at fs/sysfs/group.c:116 internal_create_group+0xc8a/0xd20 fs/sysfs/group.c:116
Modules linked in:

CPU: 0 PID: 10246 Comm: systemd-udevd Not tainted 5.13.0-rc5-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:internal_create_group+0xc8a/0xd20 fs/sysfs/group.c:116
Code: 89 de 31 c0 e8 ff 04 66 ff 41 bf ea ff ff ff e9 60 ff ff ff e8 07 f4 7f ff eb 0f e8 00 f4 7f ff e9 3f f6 ff ff e8 f6 f3 7f ff <0f> 0b e9 33 f6 ff ff 89 f9 80 e1 07 80 c1 03 38 c1 0f 8c 6a f6 ff
RSP: 0018:ffffc9000b0a73e0 EFLAGS: 00010293
RAX: ffffffff81ff255a RBX: ffff88801ecc8c50 RCX: ffff88802f4fb880
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc9000b0a74e8 R08: ffffffff81ff196c R09: fffffbfff1f4ddbb
R10: fffffbfff1f4ddbb R11: 0000000000000000 R12: ffffffff8c760c20
R13: dffffc0000000000 R14: 1ffff11003d99190 R15: ffff88801ecc8c80
FS:  00007f70951128c0(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f6b00dcd000 CR3: 0000000027f35000 CR4: 00000000001506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 blk_register_queue+0x150/0x460 block/blk-sysfs.c:885
 __device_add_disk+0xa1b/0x10d0 block/genhd.c:555
 add_disk include/linux/genhd.h:212 [inline]
 loop_add+0x604/0x7e0 drivers/block/loop.c:2174
 loop_probe+0x192/0x220 drivers/block/loop.c:2249
 blk_request_module+0x19d/0x1c0 block/genhd.c:683
 blkdev_get_no_open+0x44/0x1f0 fs/block_dev.c:1374
 blkdev_get_by_dev+0x82/0x640 fs/block_dev.c:1437
 blkdev_open+0x132/0x2c0 fs/block_dev.c:1546
 do_dentry_open+0x7cb/0x1010 fs/open.c:826
 do_open fs/namei.c:3361 [inline]
 path_openat+0x28e6/0x39b0 fs/namei.c:3494
 do_filp_open+0x221/0x460 fs/namei.c:3521
 do_sys_openat2+0x124/0x460 fs/open.c:1187
 do_sys_open fs/open.c:1203 [inline]
 __do_sys_open fs/open.c:1211 [inline]
 __se_sys_open fs/open.c:1207 [inline]
 __x64_sys_open+0x221/0x270 fs/open.c:1207
 do_syscall_64+0x3f/0xb0 arch/x86/entry/common.c:47
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7f7094258840
Code: 73 01 c3 48 8b 0d 68 77 20 00 f7 d8 64 89 01 48 83 c8 ff c3 66 0f 1f 44 00 00 83 3d 89 bb 20 00 00 75 10 b8 02 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 31 c3 48 83 ec 08 e8 1e f6 ff ff 48 89 04 24
RSP: 002b:00007ffeff276058 EFLAGS: 00000246 ORIG_RAX: 0000000000000002
RAX: ffffffffffffffda RBX: 0000560938ec3380 RCX: 00007f7094258840
RDX: 0000560938e7afe3 RSI: 00000000000a0800 RDI: 0000560938ec2090
RBP: 00007ffeff2761d0 R08: 0000560938e7a670 R09: 0000000000000010
R10: 0000560938e7ad0c R11: 0000000000000246 R12: 00007ffeff276120
R13: 0000560938ec18c0 R14: 0000000000000003 R15: 000000000000000e