------------[ cut here ]------------
!rwb
WARNING: block/blk-wbt.c:785 at wbt_init_enable_default+0x164/0x1c0 block/blk-wbt.c:785, CPU#1: syz.3.2749/21586
Modules linked in:
CPU: 1 UID: 0 PID: 21586 Comm: syz.3.2749 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
RIP: 0010:wbt_init_enable_default+0x164/0x1c0 block/blk-wbt.c:785
Code: 9e 21 fd 5b 5d 41 5c 41 5d 41 5e e9 b1 33 29 fc 4c 89 f7 e8 6e 34 8d fd eb 83 4c 89 f7 e8 64 34 8d fd eb d0 e8 ed 9d 21 fd 90 <0f> 0b 90 e9 e9 fe ff ff e8 df 9d 21 fd 90 0f 0b 90 48 b8 00 00 00
RSP: 0018:ffffc90002eb7b50 EFLAGS: 00010283
RAX: 0000000000016916 RBX: ffff88807d423000 RCX: ffffc90006bf9000
RDX: 0000000000080000 RSI: ffffffff84e70d73 RDI: ffffffff8c1b0a20
RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: ffff888029265f50
R13: ffff88803795002c R14: ffff88807d423390 R15: ffff888029265f60
FS:  00007fd45b46b6c0(0000) GS:ffff888124443000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fd45b48bf88 CR3: 000000009f3be000 CR4: 0000000000350ef0
Call Trace:
 <TASK>
 blk_register_queue+0x42c/0x590 block/blk-sysfs.c:949
 __add_disk+0x73f/0xe40 block/genhd.c:528
 add_disk_fwnode+0x118/0x5c0 block/genhd.c:597
 add_disk include/linux/blkdev.h:785 [inline]
 loop_add+0x90b/0xb60 drivers/block/loop.c:2092
 loop_control_get_free drivers/block/loop.c:2208 [inline]
 loop_control_ioctl+0x1fa/0x620 drivers/block/loop.c:2223
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:597 [inline]
 __se_sys_ioctl fs/ioctl.c:583 [inline]
 __x64_sys_ioctl+0x18e/0x210 fs/ioctl.c:583
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x106/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fd45a59c799
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fd45b46b028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fd45a816090 RCX: 00007fd45a59c799
RDX: 0000000000000000 RSI: 0000000000004c82 RDI: 0000000000000009
RBP: 00007fd45a632c99 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fd45a816128 R14: 00007fd45a816090 R15: 00007ffd4a6eb3e8
 </TASK>